misc/winutils/include/zlib.h
author Wuzzy <Wuzzy2@mail.ru>
Sat, 25 Aug 2018 18:04:06 +0200
changeset 13693 af208acaada6
parent 7812 00696c1450da
permissions -rw-r--r--
Fix translatability of "unknown command" server message
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/* zlib.h -- interface of the 'zlib' general purpose compression library
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  version 1.2.5, April 19th, 2010
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  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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  Jean-loup Gailly        Mark Adler
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  jloup@gzip.org          madler@alumni.caltech.edu
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  The data format used by the zlib library is described by RFCs (Request for
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  Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
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  (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
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*/
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#ifndef ZLIB_H
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#define ZLIB_H
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#include "zconf.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ZLIB_VERSION "1.2.5"
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#define ZLIB_VERNUM 0x1250
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#define ZLIB_VER_MAJOR 1
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#define ZLIB_VER_MINOR 2
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#define ZLIB_VER_REVISION 5
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#define ZLIB_VER_SUBREVISION 0
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/*
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    The 'zlib' compression library provides in-memory compression and
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  decompression functions, including integrity checks of the uncompressed data.
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  This version of the library supports only one compression method (deflation)
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  but other algorithms will be added later and will have the same stream
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  interface.
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    Compression can be done in a single step if the buffers are large enough,
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  or can be done by repeated calls of the compression function.  In the latter
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  case, the application must provide more input and/or consume the output
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  (providing more output space) before each call.
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    The compressed data format used by default by the in-memory functions is
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  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
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  around a deflate stream, which is itself documented in RFC 1951.
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    The library also supports reading and writing files in gzip (.gz) format
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  with an interface similar to that of stdio using the functions that start
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  with "gz".  The gzip format is different from the zlib format.  gzip is a
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  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
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    This library can optionally read and write gzip streams in memory as well.
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    The zlib format was designed to be compact and fast for use in memory
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  and on communications channels.  The gzip format was designed for single-
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  file compression on file systems, has a larger header than zlib to maintain
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  directory information, and uses a different, slower check method than zlib.
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    The library does not install any signal handler.  The decoder checks
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  the consistency of the compressed data, so the library should never crash
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  even in case of corrupted input.
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*/
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typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
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typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
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struct internal_state;
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typedef struct z_stream_s {
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    Bytef    *next_in;  /* next input byte */
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    uInt     avail_in;  /* number of bytes available at next_in */
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    uLong    total_in;  /* total nb of input bytes read so far */
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    Bytef    *next_out; /* next output byte should be put there */
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    uInt     avail_out; /* remaining free space at next_out */
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    uLong    total_out; /* total nb of bytes output so far */
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    char     *msg;      /* last error message, NULL if no error */
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    struct internal_state FAR *state; /* not visible by applications */
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    alloc_func zalloc;  /* used to allocate the internal state */
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    free_func  zfree;   /* used to free the internal state */
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    voidpf     opaque;  /* private data object passed to zalloc and zfree */
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    int     data_type;  /* best guess about the data type: binary or text */
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    uLong   adler;      /* adler32 value of the uncompressed data */
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    uLong   reserved;   /* reserved for future use */
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} z_stream;
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typedef z_stream FAR *z_streamp;
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/*
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     gzip header information passed to and from zlib routines.  See RFC 1952
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  for more details on the meanings of these fields.
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*/
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typedef struct gz_header_s {
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    int     text;       /* true if compressed data believed to be text */
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    uLong   time;       /* modification time */
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    int     xflags;     /* extra flags (not used when writing a gzip file) */
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    int     os;         /* operating system */
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    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
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    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
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    uInt    extra_max;  /* space at extra (only when reading header) */
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    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
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    uInt    name_max;   /* space at name (only when reading header) */
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    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
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    uInt    comm_max;   /* space at comment (only when reading header) */
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    int     hcrc;       /* true if there was or will be a header crc */
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    int     done;       /* true when done reading gzip header (not used
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                           when writing a gzip file) */
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} gz_header;
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typedef gz_header FAR *gz_headerp;
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/*
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     The application must update next_in and avail_in when avail_in has dropped
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   to zero.  It must update next_out and avail_out when avail_out has dropped
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   to zero.  The application must initialize zalloc, zfree and opaque before
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   calling the init function.  All other fields are set by the compression
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   library and must not be updated by the application.
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     The opaque value provided by the application will be passed as the first
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   parameter for calls of zalloc and zfree.  This can be useful for custom
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   memory management.  The compression library attaches no meaning to the
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   opaque value.
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     zalloc must return Z_NULL if there is not enough memory for the object.
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   If zlib is used in a multi-threaded application, zalloc and zfree must be
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   thread safe.
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     On 16-bit systems, the functions zalloc and zfree must be able to allocate
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   exactly 65536 bytes, but will not be required to allocate more than this if
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   the symbol MAXSEG_64K is defined (see zconf.h).  WARNING: On MSDOS, pointers
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   returned by zalloc for objects of exactly 65536 bytes *must* have their
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   offset normalized to zero.  The default allocation function provided by this
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   library ensures this (see zutil.c).  To reduce memory requirements and avoid
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   any allocation of 64K objects, at the expense of compression ratio, compile
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   the library with -DMAX_WBITS=14 (see zconf.h).
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     The fields total_in and total_out can be used for statistics or progress
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   reports.  After compression, total_in holds the total size of the
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   uncompressed data and may be saved for use in the decompressor (particularly
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   if the decompressor wants to decompress everything in a single step).
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*/
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                        /* constants */
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#define Z_NO_FLUSH      0
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#define Z_PARTIAL_FLUSH 1
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#define Z_SYNC_FLUSH    2
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#define Z_FULL_FLUSH    3
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#define Z_FINISH        4
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#define Z_BLOCK         5
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#define Z_TREES         6
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/* Allowed flush values; see deflate() and inflate() below for details */
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#define Z_OK            0
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#define Z_STREAM_END    1
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#define Z_NEED_DICT     2
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#define Z_ERRNO        (-1)
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#define Z_STREAM_ERROR (-2)
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#define Z_DATA_ERROR   (-3)
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#define Z_MEM_ERROR    (-4)
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#define Z_BUF_ERROR    (-5)
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#define Z_VERSION_ERROR (-6)
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/* Return codes for the compression/decompression functions. Negative values
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 * are errors, positive values are used for special but normal events.
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 */
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#define Z_NO_COMPRESSION         0
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#define Z_BEST_SPEED             1
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#define Z_BEST_COMPRESSION       9
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#define Z_DEFAULT_COMPRESSION  (-1)
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/* compression levels */
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#define Z_FILTERED            1
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#define Z_HUFFMAN_ONLY        2
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#define Z_RLE                 3
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#define Z_FIXED               4
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#define Z_DEFAULT_STRATEGY    0
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/* compression strategy; see deflateInit2() below for details */
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#define Z_BINARY   0
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#define Z_TEXT     1
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#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
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#define Z_UNKNOWN  2
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/* Possible values of the data_type field (though see inflate()) */
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#define Z_DEFLATED   8
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/* The deflate compression method (the only one supported in this version) */
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#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
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#define zlib_version zlibVersion()
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/* for compatibility with versions < 1.0.2 */
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                        /* basic functions */
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ZEXTERN const char * ZEXPORT zlibVersion OF((void));
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/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
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   If the first character differs, the library code actually used is not
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   compatible with the zlib.h header file used by the application.  This check
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   is automatically made by deflateInit and inflateInit.
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 */
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/*
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ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
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     Initializes the internal stream state for compression.  The fields
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   zalloc, zfree and opaque must be initialized before by the caller.  If
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   zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
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   allocation functions.
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     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
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   1 gives best speed, 9 gives best compression, 0 gives no compression at all
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   (the input data is simply copied a block at a time).  Z_DEFAULT_COMPRESSION
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   requests a default compromise between speed and compression (currently
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   equivalent to level 6).
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     deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
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   memory, Z_STREAM_ERROR if level is not a valid compression level, or
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   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
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   with the version assumed by the caller (ZLIB_VERSION).  msg is set to null
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   if there is no error message.  deflateInit does not perform any compression:
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   this will be done by deflate().
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*/
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ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
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/*
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    deflate compresses as much data as possible, and stops when the input
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  buffer becomes empty or the output buffer becomes full.  It may introduce
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  some output latency (reading input without producing any output) except when
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  forced to flush.
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    The detailed semantics are as follows.  deflate performs one or both of the
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  following actions:
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  - Compress more input starting at next_in and update next_in and avail_in
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    accordingly.  If not all input can be processed (because there is not
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    enough room in the output buffer), next_in and avail_in are updated and
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    processing will resume at this point for the next call of deflate().
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  - Provide more output starting at next_out and update next_out and avail_out
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    accordingly.  This action is forced if the parameter flush is non zero.
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    Forcing flush frequently degrades the compression ratio, so this parameter
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    should be set only when necessary (in interactive applications).  Some
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    output may be provided even if flush is not set.
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    Before the call of deflate(), the application should ensure that at least
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  one of the actions is possible, by providing more input and/or consuming more
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  output, and updating avail_in or avail_out accordingly; avail_out should
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  never be zero before the call.  The application can consume the compressed
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  output when it wants, for example when the output buffer is full (avail_out
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  == 0), or after each call of deflate().  If deflate returns Z_OK and with
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  zero avail_out, it must be called again after making room in the output
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  buffer because there might be more output pending.
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    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
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  decide how much data to accumulate before producing output, in order to
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  maximize compression.
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    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
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  flushed to the output buffer and the output is aligned on a byte boundary, so
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  that the decompressor can get all input data available so far.  (In
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  particular avail_in is zero after the call if enough output space has been
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  provided before the call.) Flushing may degrade compression for some
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  compression algorithms and so it should be used only when necessary.  This
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  completes the current deflate block and follows it with an empty stored block
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  that is three bits plus filler bits to the next byte, followed by four bytes
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  (00 00 ff ff).
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    If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
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  output buffer, but the output is not aligned to a byte boundary.  All of the
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  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
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  This completes the current deflate block and follows it with an empty fixed
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  codes block that is 10 bits long.  This assures that enough bytes are output
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  in order for the decompressor to finish the block before the empty fixed code
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  block.
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    If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
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  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
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  seven bits of the current block are held to be written as the next byte after
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  the next deflate block is completed.  In this case, the decompressor may not
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  be provided enough bits at this point in order to complete decompression of
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  the data provided so far to the compressor.  It may need to wait for the next
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  block to be emitted.  This is for advanced applications that need to control
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  the emission of deflate blocks.
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   306
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    If flush is set to Z_FULL_FLUSH, all output is flushed as with
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  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
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  restart from this point if previous compressed data has been damaged or if
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  random access is desired.  Using Z_FULL_FLUSH too often can seriously degrade
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  compression.
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    If deflate returns with avail_out == 0, this function must be called again
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  with the same value of the flush parameter and more output space (updated
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  avail_out), until the flush is complete (deflate returns with non-zero
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  avail_out).  In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
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  avail_out is greater than six to avoid repeated flush markers due to
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  avail_out == 0 on return.
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    If the parameter flush is set to Z_FINISH, pending input is processed,
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  pending output is flushed and deflate returns with Z_STREAM_END if there was
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  enough output space; if deflate returns with Z_OK, this function must be
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  called again with Z_FINISH and more output space (updated avail_out) but no
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  more input data, until it returns with Z_STREAM_END or an error.  After
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  deflate has returned Z_STREAM_END, the only possible operations on the stream
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  are deflateReset or deflateEnd.
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    Z_FINISH can be used immediately after deflateInit if all the compression
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  is to be done in a single step.  In this case, avail_out must be at least the
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  value returned by deflateBound (see below).  If deflate does not return
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  Z_STREAM_END, then it must be called again as described above.
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    deflate() sets strm->adler to the adler32 checksum of all input read
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  so far (that is, total_in bytes).
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   335
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    deflate() may update strm->data_type if it can make a good guess about
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  the input data type (Z_BINARY or Z_TEXT).  In doubt, the data is considered
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  binary.  This field is only for information purposes and does not affect the
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  compression algorithm in any manner.
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   340
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    deflate() returns Z_OK if some progress has been made (more input
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  processed or more output produced), Z_STREAM_END if all input has been
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  consumed and all output has been produced (only when flush is set to
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  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
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  if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible
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  (for example avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not
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  fatal, and deflate() can be called again with more input and more output
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  space to continue compressing.
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*/
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ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
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/*
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     All dynamically allocated data structures for this stream are freed.
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   This function discards any unprocessed input and does not flush any pending
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   output.
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     deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
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   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
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   prematurely (some input or output was discarded).  In the error case, msg
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   may be set but then points to a static string (which must not be
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   deallocated).
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*/
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   364
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   365
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/*
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ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
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     Initializes the internal stream state for decompression.  The fields
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parents:
diff changeset
   370
   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
00696c1450da enable png support under win32
koda
parents:
diff changeset
   371
   the caller.  If next_in is not Z_NULL and avail_in is large enough (the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   372
   exact value depends on the compression method), inflateInit determines the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   373
   compression method from the zlib header and allocates all data structures
00696c1450da enable png support under win32
koda
parents:
diff changeset
   374
   accordingly; otherwise the allocation will be deferred to the first call of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   375
   inflate.  If zalloc and zfree are set to Z_NULL, inflateInit updates them to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   376
   use default allocation functions.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   377
00696c1450da enable png support under win32
koda
parents:
diff changeset
   378
     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
00696c1450da enable png support under win32
koda
parents:
diff changeset
   379
   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   380
   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
00696c1450da enable png support under win32
koda
parents:
diff changeset
   381
   invalid, such as a null pointer to the structure.  msg is set to null if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   382
   there is no error message.  inflateInit does not perform any decompression
00696c1450da enable png support under win32
koda
parents:
diff changeset
   383
   apart from possibly reading the zlib header if present: actual decompression
00696c1450da enable png support under win32
koda
parents:
diff changeset
   384
   will be done by inflate().  (So next_in and avail_in may be modified, but
00696c1450da enable png support under win32
koda
parents:
diff changeset
   385
   next_out and avail_out are unused and unchanged.) The current implementation
00696c1450da enable png support under win32
koda
parents:
diff changeset
   386
   of inflateInit() does not process any header information -- that is deferred
00696c1450da enable png support under win32
koda
parents:
diff changeset
   387
   until inflate() is called.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   388
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   389
00696c1450da enable png support under win32
koda
parents:
diff changeset
   390
00696c1450da enable png support under win32
koda
parents:
diff changeset
   391
ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   392
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   393
    inflate decompresses as much data as possible, and stops when the input
00696c1450da enable png support under win32
koda
parents:
diff changeset
   394
  buffer becomes empty or the output buffer becomes full.  It may introduce
00696c1450da enable png support under win32
koda
parents:
diff changeset
   395
  some output latency (reading input without producing any output) except when
00696c1450da enable png support under win32
koda
parents:
diff changeset
   396
  forced to flush.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   397
00696c1450da enable png support under win32
koda
parents:
diff changeset
   398
  The detailed semantics are as follows.  inflate performs one or both of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   399
  following actions:
00696c1450da enable png support under win32
koda
parents:
diff changeset
   400
00696c1450da enable png support under win32
koda
parents:
diff changeset
   401
  - Decompress more input starting at next_in and update next_in and avail_in
00696c1450da enable png support under win32
koda
parents:
diff changeset
   402
    accordingly.  If not all input can be processed (because there is not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   403
    enough room in the output buffer), next_in is updated and processing will
00696c1450da enable png support under win32
koda
parents:
diff changeset
   404
    resume at this point for the next call of inflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   405
00696c1450da enable png support under win32
koda
parents:
diff changeset
   406
  - Provide more output starting at next_out and update next_out and avail_out
00696c1450da enable png support under win32
koda
parents:
diff changeset
   407
    accordingly.  inflate() provides as much output as possible, until there is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   408
    no more input data or no more space in the output buffer (see below about
00696c1450da enable png support under win32
koda
parents:
diff changeset
   409
    the flush parameter).
00696c1450da enable png support under win32
koda
parents:
diff changeset
   410
00696c1450da enable png support under win32
koda
parents:
diff changeset
   411
    Before the call of inflate(), the application should ensure that at least
00696c1450da enable png support under win32
koda
parents:
diff changeset
   412
  one of the actions is possible, by providing more input and/or consuming more
00696c1450da enable png support under win32
koda
parents:
diff changeset
   413
  output, and updating the next_* and avail_* values accordingly.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   414
  application can consume the uncompressed output when it wants, for example
00696c1450da enable png support under win32
koda
parents:
diff changeset
   415
  when the output buffer is full (avail_out == 0), or after each call of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   416
  inflate().  If inflate returns Z_OK and with zero avail_out, it must be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   417
  called again after making room in the output buffer because there might be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   418
  more output pending.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   419
00696c1450da enable png support under win32
koda
parents:
diff changeset
   420
    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   421
  Z_BLOCK, or Z_TREES.  Z_SYNC_FLUSH requests that inflate() flush as much
00696c1450da enable png support under win32
koda
parents:
diff changeset
   422
  output as possible to the output buffer.  Z_BLOCK requests that inflate()
00696c1450da enable png support under win32
koda
parents:
diff changeset
   423
  stop if and when it gets to the next deflate block boundary.  When decoding
00696c1450da enable png support under win32
koda
parents:
diff changeset
   424
  the zlib or gzip format, this will cause inflate() to return immediately
00696c1450da enable png support under win32
koda
parents:
diff changeset
   425
  after the header and before the first block.  When doing a raw inflate,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   426
  inflate() will go ahead and process the first block, and will return when it
00696c1450da enable png support under win32
koda
parents:
diff changeset
   427
  gets to the end of that block, or when it runs out of data.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   428
00696c1450da enable png support under win32
koda
parents:
diff changeset
   429
    The Z_BLOCK option assists in appending to or combining deflate streams.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   430
  Also to assist in this, on return inflate() will set strm->data_type to the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   431
  number of unused bits in the last byte taken from strm->next_in, plus 64 if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   432
  inflate() is currently decoding the last block in the deflate stream, plus
00696c1450da enable png support under win32
koda
parents:
diff changeset
   433
  128 if inflate() returned immediately after decoding an end-of-block code or
00696c1450da enable png support under win32
koda
parents:
diff changeset
   434
  decoding the complete header up to just before the first byte of the deflate
00696c1450da enable png support under win32
koda
parents:
diff changeset
   435
  stream.  The end-of-block will not be indicated until all of the uncompressed
00696c1450da enable png support under win32
koda
parents:
diff changeset
   436
  data from that block has been written to strm->next_out.  The number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   437
  unused bits may in general be greater than seven, except when bit 7 of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   438
  data_type is set, in which case the number of unused bits will be less than
00696c1450da enable png support under win32
koda
parents:
diff changeset
   439
  eight.  data_type is set as noted here every time inflate() returns for all
00696c1450da enable png support under win32
koda
parents:
diff changeset
   440
  flush options, and so can be used to determine the amount of currently
00696c1450da enable png support under win32
koda
parents:
diff changeset
   441
  consumed input in bits.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   442
00696c1450da enable png support under win32
koda
parents:
diff changeset
   443
    The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   444
  end of each deflate block header is reached, before any actual data in that
00696c1450da enable png support under win32
koda
parents:
diff changeset
   445
  block is decoded.  This allows the caller to determine the length of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   446
  deflate block header for later use in random access within a deflate block.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   447
  256 is added to the value of strm->data_type when inflate() returns
00696c1450da enable png support under win32
koda
parents:
diff changeset
   448
  immediately after reaching the end of the deflate block header.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   449
00696c1450da enable png support under win32
koda
parents:
diff changeset
   450
    inflate() should normally be called until it returns Z_STREAM_END or an
00696c1450da enable png support under win32
koda
parents:
diff changeset
   451
  error.  However if all decompression is to be performed in a single step (a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   452
  single call of inflate), the parameter flush should be set to Z_FINISH.  In
00696c1450da enable png support under win32
koda
parents:
diff changeset
   453
  this case all pending input is processed and all pending output is flushed;
00696c1450da enable png support under win32
koda
parents:
diff changeset
   454
  avail_out must be large enough to hold all the uncompressed data.  (The size
00696c1450da enable png support under win32
koda
parents:
diff changeset
   455
  of the uncompressed data may have been saved by the compressor for this
00696c1450da enable png support under win32
koda
parents:
diff changeset
   456
  purpose.) The next operation on this stream must be inflateEnd to deallocate
00696c1450da enable png support under win32
koda
parents:
diff changeset
   457
  the decompression state.  The use of Z_FINISH is never required, but can be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   458
  used to inform inflate that a faster approach may be used for the single
00696c1450da enable png support under win32
koda
parents:
diff changeset
   459
  inflate() call.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   460
00696c1450da enable png support under win32
koda
parents:
diff changeset
   461
     In this implementation, inflate() always flushes as much output as
00696c1450da enable png support under win32
koda
parents:
diff changeset
   462
  possible to the output buffer, and always uses the faster approach on the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   463
  first call.  So the only effect of the flush parameter in this implementation
00696c1450da enable png support under win32
koda
parents:
diff changeset
   464
  is on the return value of inflate(), as noted below, or when it returns early
00696c1450da enable png support under win32
koda
parents:
diff changeset
   465
  because Z_BLOCK or Z_TREES is used.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   466
00696c1450da enable png support under win32
koda
parents:
diff changeset
   467
     If a preset dictionary is needed after this call (see inflateSetDictionary
00696c1450da enable png support under win32
koda
parents:
diff changeset
   468
  below), inflate sets strm->adler to the adler32 checksum of the dictionary
00696c1450da enable png support under win32
koda
parents:
diff changeset
   469
  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
00696c1450da enable png support under win32
koda
parents:
diff changeset
   470
  strm->adler to the adler32 checksum of all output produced so far (that is,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   471
  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
00696c1450da enable png support under win32
koda
parents:
diff changeset
   472
  below.  At the end of the stream, inflate() checks that its computed adler32
00696c1450da enable png support under win32
koda
parents:
diff changeset
   473
  checksum is equal to that saved by the compressor and returns Z_STREAM_END
00696c1450da enable png support under win32
koda
parents:
diff changeset
   474
  only if the checksum is correct.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   475
00696c1450da enable png support under win32
koda
parents:
diff changeset
   476
    inflate() can decompress and check either zlib-wrapped or gzip-wrapped
00696c1450da enable png support under win32
koda
parents:
diff changeset
   477
  deflate data.  The header type is detected automatically, if requested when
00696c1450da enable png support under win32
koda
parents:
diff changeset
   478
  initializing with inflateInit2().  Any information contained in the gzip
00696c1450da enable png support under win32
koda
parents:
diff changeset
   479
  header is not retained, so applications that need that information should
00696c1450da enable png support under win32
koda
parents:
diff changeset
   480
  instead use raw inflate, see inflateInit2() below, or inflateBack() and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   481
  perform their own processing of the gzip header and trailer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   482
00696c1450da enable png support under win32
koda
parents:
diff changeset
   483
    inflate() returns Z_OK if some progress has been made (more input processed
00696c1450da enable png support under win32
koda
parents:
diff changeset
   484
  or more output produced), Z_STREAM_END if the end of the compressed data has
00696c1450da enable png support under win32
koda
parents:
diff changeset
   485
  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   486
  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
00696c1450da enable png support under win32
koda
parents:
diff changeset
   487
  corrupted (input stream not conforming to the zlib format or incorrect check
00696c1450da enable png support under win32
koda
parents:
diff changeset
   488
  value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
00696c1450da enable png support under win32
koda
parents:
diff changeset
   489
  next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   490
  Z_BUF_ERROR if no progress is possible or if there was not enough room in the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   491
  output buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   492
  inflate() can be called again with more input and more output space to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   493
  continue decompressing.  If Z_DATA_ERROR is returned, the application may
00696c1450da enable png support under win32
koda
parents:
diff changeset
   494
  then call inflateSync() to look for a good compression block if a partial
00696c1450da enable png support under win32
koda
parents:
diff changeset
   495
  recovery of the data is desired.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   496
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   497
00696c1450da enable png support under win32
koda
parents:
diff changeset
   498
00696c1450da enable png support under win32
koda
parents:
diff changeset
   499
ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   500
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   501
     All dynamically allocated data structures for this stream are freed.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   502
   This function discards any unprocessed input and does not flush any pending
00696c1450da enable png support under win32
koda
parents:
diff changeset
   503
   output.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   504
00696c1450da enable png support under win32
koda
parents:
diff changeset
   505
     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
00696c1450da enable png support under win32
koda
parents:
diff changeset
   506
   was inconsistent.  In the error case, msg may be set but then points to a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   507
   static string (which must not be deallocated).
00696c1450da enable png support under win32
koda
parents:
diff changeset
   508
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   509
00696c1450da enable png support under win32
koda
parents:
diff changeset
   510
00696c1450da enable png support under win32
koda
parents:
diff changeset
   511
                        /* Advanced functions */
00696c1450da enable png support under win32
koda
parents:
diff changeset
   512
00696c1450da enable png support under win32
koda
parents:
diff changeset
   513
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   514
    The following functions are needed only in some special applications.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   515
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   516
00696c1450da enable png support under win32
koda
parents:
diff changeset
   517
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   518
ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   519
                                     int  level,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   520
                                     int  method,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   521
                                     int  windowBits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   522
                                     int  memLevel,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   523
                                     int  strategy));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   524
00696c1450da enable png support under win32
koda
parents:
diff changeset
   525
     This is another version of deflateInit with more compression options.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   526
   fields next_in, zalloc, zfree and opaque must be initialized before by the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   527
   caller.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   528
00696c1450da enable png support under win32
koda
parents:
diff changeset
   529
     The method parameter is the compression method.  It must be Z_DEFLATED in
00696c1450da enable png support under win32
koda
parents:
diff changeset
   530
   this version of the library.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   531
00696c1450da enable png support under win32
koda
parents:
diff changeset
   532
     The windowBits parameter is the base two logarithm of the window size
00696c1450da enable png support under win32
koda
parents:
diff changeset
   533
   (the size of the history buffer).  It should be in the range 8..15 for this
00696c1450da enable png support under win32
koda
parents:
diff changeset
   534
   version of the library.  Larger values of this parameter result in better
00696c1450da enable png support under win32
koda
parents:
diff changeset
   535
   compression at the expense of memory usage.  The default value is 15 if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   536
   deflateInit is used instead.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   537
00696c1450da enable png support under win32
koda
parents:
diff changeset
   538
     windowBits can also be -8..-15 for raw deflate.  In this case, -windowBits
00696c1450da enable png support under win32
koda
parents:
diff changeset
   539
   determines the window size.  deflate() will then generate raw deflate data
00696c1450da enable png support under win32
koda
parents:
diff changeset
   540
   with no zlib header or trailer, and will not compute an adler32 check value.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   541
00696c1450da enable png support under win32
koda
parents:
diff changeset
   542
     windowBits can also be greater than 15 for optional gzip encoding.  Add
00696c1450da enable png support under win32
koda
parents:
diff changeset
   543
   16 to windowBits to write a simple gzip header and trailer around the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   544
   compressed data instead of a zlib wrapper.  The gzip header will have no
00696c1450da enable png support under win32
koda
parents:
diff changeset
   545
   file name, no extra data, no comment, no modification time (set to zero), no
00696c1450da enable png support under win32
koda
parents:
diff changeset
   546
   header crc, and the operating system will be set to 255 (unknown).  If a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   547
   gzip stream is being written, strm->adler is a crc32 instead of an adler32.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   548
00696c1450da enable png support under win32
koda
parents:
diff changeset
   549
     The memLevel parameter specifies how much memory should be allocated
00696c1450da enable png support under win32
koda
parents:
diff changeset
   550
   for the internal compression state.  memLevel=1 uses minimum memory but is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   551
   slow and reduces compression ratio; memLevel=9 uses maximum memory for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   552
   optimal speed.  The default value is 8.  See zconf.h for total memory usage
00696c1450da enable png support under win32
koda
parents:
diff changeset
   553
   as a function of windowBits and memLevel.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   554
00696c1450da enable png support under win32
koda
parents:
diff changeset
   555
     The strategy parameter is used to tune the compression algorithm.  Use the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   556
   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   557
   filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
00696c1450da enable png support under win32
koda
parents:
diff changeset
   558
   string match), or Z_RLE to limit match distances to one (run-length
00696c1450da enable png support under win32
koda
parents:
diff changeset
   559
   encoding).  Filtered data consists mostly of small values with a somewhat
00696c1450da enable png support under win32
koda
parents:
diff changeset
   560
   random distribution.  In this case, the compression algorithm is tuned to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   561
   compress them better.  The effect of Z_FILTERED is to force more Huffman
00696c1450da enable png support under win32
koda
parents:
diff changeset
   562
   coding and less string matching; it is somewhat intermediate between
00696c1450da enable png support under win32
koda
parents:
diff changeset
   563
   Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY.  Z_RLE is designed to be almost as
00696c1450da enable png support under win32
koda
parents:
diff changeset
   564
   fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   565
   strategy parameter only affects the compression ratio but not the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   566
   correctness of the compressed output even if it is not set appropriately.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   567
   Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
00696c1450da enable png support under win32
koda
parents:
diff changeset
   568
   decoder for special applications.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   569
00696c1450da enable png support under win32
koda
parents:
diff changeset
   570
     deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
00696c1450da enable png support under win32
koda
parents:
diff changeset
   571
   memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
00696c1450da enable png support under win32
koda
parents:
diff changeset
   572
   method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   573
   incompatible with the version assumed by the caller (ZLIB_VERSION).  msg is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   574
   set to null if there is no error message.  deflateInit2 does not perform any
00696c1450da enable png support under win32
koda
parents:
diff changeset
   575
   compression: this will be done by deflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   576
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   577
00696c1450da enable png support under win32
koda
parents:
diff changeset
   578
ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   579
                                             const Bytef *dictionary,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   580
                                             uInt  dictLength));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   581
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   582
     Initializes the compression dictionary from the given byte sequence
00696c1450da enable png support under win32
koda
parents:
diff changeset
   583
   without producing any compressed output.  This function must be called
00696c1450da enable png support under win32
koda
parents:
diff changeset
   584
   immediately after deflateInit, deflateInit2 or deflateReset, before any call
00696c1450da enable png support under win32
koda
parents:
diff changeset
   585
   of deflate.  The compressor and decompressor must use exactly the same
00696c1450da enable png support under win32
koda
parents:
diff changeset
   586
   dictionary (see inflateSetDictionary).
00696c1450da enable png support under win32
koda
parents:
diff changeset
   587
00696c1450da enable png support under win32
koda
parents:
diff changeset
   588
     The dictionary should consist of strings (byte sequences) that are likely
00696c1450da enable png support under win32
koda
parents:
diff changeset
   589
   to be encountered later in the data to be compressed, with the most commonly
00696c1450da enable png support under win32
koda
parents:
diff changeset
   590
   used strings preferably put towards the end of the dictionary.  Using a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   591
   dictionary is most useful when the data to be compressed is short and can be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   592
   predicted with good accuracy; the data can then be compressed better than
00696c1450da enable png support under win32
koda
parents:
diff changeset
   593
   with the default empty dictionary.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   594
00696c1450da enable png support under win32
koda
parents:
diff changeset
   595
     Depending on the size of the compression data structures selected by
00696c1450da enable png support under win32
koda
parents:
diff changeset
   596
   deflateInit or deflateInit2, a part of the dictionary may in effect be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   597
   discarded, for example if the dictionary is larger than the window size
00696c1450da enable png support under win32
koda
parents:
diff changeset
   598
   provided in deflateInit or deflateInit2.  Thus the strings most likely to be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   599
   useful should be put at the end of the dictionary, not at the front.  In
00696c1450da enable png support under win32
koda
parents:
diff changeset
   600
   addition, the current implementation of deflate will use at most the window
00696c1450da enable png support under win32
koda
parents:
diff changeset
   601
   size minus 262 bytes of the provided dictionary.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   602
00696c1450da enable png support under win32
koda
parents:
diff changeset
   603
     Upon return of this function, strm->adler is set to the adler32 value
00696c1450da enable png support under win32
koda
parents:
diff changeset
   604
   of the dictionary; the decompressor may later use this value to determine
00696c1450da enable png support under win32
koda
parents:
diff changeset
   605
   which dictionary has been used by the compressor.  (The adler32 value
00696c1450da enable png support under win32
koda
parents:
diff changeset
   606
   applies to the whole dictionary even if only a subset of the dictionary is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   607
   actually used by the compressor.) If a raw deflate was requested, then the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   608
   adler32 value is not computed and strm->adler is not set.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   609
00696c1450da enable png support under win32
koda
parents:
diff changeset
   610
     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   611
   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   612
   inconsistent (for example if deflate has already been called for this stream
00696c1450da enable png support under win32
koda
parents:
diff changeset
   613
   or if the compression method is bsort).  deflateSetDictionary does not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   614
   perform any compression: this will be done by deflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   615
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   616
00696c1450da enable png support under win32
koda
parents:
diff changeset
   617
ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   618
                                    z_streamp source));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   619
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   620
     Sets the destination stream as a complete copy of the source stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   621
00696c1450da enable png support under win32
koda
parents:
diff changeset
   622
     This function can be useful when several compression strategies will be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   623
   tried, for example when there are several ways of pre-processing the input
00696c1450da enable png support under win32
koda
parents:
diff changeset
   624
   data with a filter.  The streams that will be discarded should then be freed
00696c1450da enable png support under win32
koda
parents:
diff changeset
   625
   by calling deflateEnd.  Note that deflateCopy duplicates the internal
00696c1450da enable png support under win32
koda
parents:
diff changeset
   626
   compression state which can be quite large, so this strategy is slow and can
00696c1450da enable png support under win32
koda
parents:
diff changeset
   627
   consume lots of memory.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   628
00696c1450da enable png support under win32
koda
parents:
diff changeset
   629
     deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   630
   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
00696c1450da enable png support under win32
koda
parents:
diff changeset
   631
   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   632
   destination.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   633
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   634
00696c1450da enable png support under win32
koda
parents:
diff changeset
   635
ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   636
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   637
     This function is equivalent to deflateEnd followed by deflateInit,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   638
   but does not free and reallocate all the internal compression state.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   639
   stream will keep the same compression level and any other attributes that
00696c1450da enable png support under win32
koda
parents:
diff changeset
   640
   may have been set by deflateInit2.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   641
00696c1450da enable png support under win32
koda
parents:
diff changeset
   642
     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   643
   stream state was inconsistent (such as zalloc or state being Z_NULL).
00696c1450da enable png support under win32
koda
parents:
diff changeset
   644
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   645
00696c1450da enable png support under win32
koda
parents:
diff changeset
   646
ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   647
                                      int level,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   648
                                      int strategy));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   649
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   650
     Dynamically update the compression level and compression strategy.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   651
   interpretation of level and strategy is as in deflateInit2.  This can be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   652
   used to switch between compression and straight copy of the input data, or
00696c1450da enable png support under win32
koda
parents:
diff changeset
   653
   to switch to a different kind of input data requiring a different strategy.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   654
   If the compression level is changed, the input available so far is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   655
   compressed with the old level (and may be flushed); the new level will take
00696c1450da enable png support under win32
koda
parents:
diff changeset
   656
   effect only at the next call of deflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   657
00696c1450da enable png support under win32
koda
parents:
diff changeset
   658
     Before the call of deflateParams, the stream state must be set as for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   659
   a call of deflate(), since the currently available input may have to be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   660
   compressed and flushed.  In particular, strm->avail_out must be non-zero.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   661
00696c1450da enable png support under win32
koda
parents:
diff changeset
   662
     deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   663
   stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   664
   strm->avail_out was zero.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   665
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   666
00696c1450da enable png support under win32
koda
parents:
diff changeset
   667
ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   668
                                    int good_length,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   669
                                    int max_lazy,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   670
                                    int nice_length,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   671
                                    int max_chain));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   672
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   673
     Fine tune deflate's internal compression parameters.  This should only be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   674
   used by someone who understands the algorithm used by zlib's deflate for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   675
   searching for the best matching string, and even then only by the most
00696c1450da enable png support under win32
koda
parents:
diff changeset
   676
   fanatic optimizer trying to squeeze out the last compressed bit for their
00696c1450da enable png support under win32
koda
parents:
diff changeset
   677
   specific input data.  Read the deflate.c source code for the meaning of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   678
   max_lazy, good_length, nice_length, and max_chain parameters.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   679
00696c1450da enable png support under win32
koda
parents:
diff changeset
   680
     deflateTune() can be called after deflateInit() or deflateInit2(), and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   681
   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   682
 */
00696c1450da enable png support under win32
koda
parents:
diff changeset
   683
00696c1450da enable png support under win32
koda
parents:
diff changeset
   684
ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   685
                                       uLong sourceLen));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   686
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   687
     deflateBound() returns an upper bound on the compressed size after
00696c1450da enable png support under win32
koda
parents:
diff changeset
   688
   deflation of sourceLen bytes.  It must be called after deflateInit() or
00696c1450da enable png support under win32
koda
parents:
diff changeset
   689
   deflateInit2(), and after deflateSetHeader(), if used.  This would be used
00696c1450da enable png support under win32
koda
parents:
diff changeset
   690
   to allocate an output buffer for deflation in a single pass, and so would be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   691
   called before deflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   692
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   693
00696c1450da enable png support under win32
koda
parents:
diff changeset
   694
ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   695
                                     int bits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   696
                                     int value));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   697
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   698
     deflatePrime() inserts bits in the deflate output stream.  The intent
00696c1450da enable png support under win32
koda
parents:
diff changeset
   699
   is that this function is used to start off the deflate output with the bits
00696c1450da enable png support under win32
koda
parents:
diff changeset
   700
   leftover from a previous deflate stream when appending to it.  As such, this
00696c1450da enable png support under win32
koda
parents:
diff changeset
   701
   function can only be used for raw deflate, and must be used before the first
00696c1450da enable png support under win32
koda
parents:
diff changeset
   702
   deflate() call after a deflateInit2() or deflateReset().  bits must be less
00696c1450da enable png support under win32
koda
parents:
diff changeset
   703
   than or equal to 16, and that many of the least significant bits of value
00696c1450da enable png support under win32
koda
parents:
diff changeset
   704
   will be inserted in the output.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   705
00696c1450da enable png support under win32
koda
parents:
diff changeset
   706
     deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   707
   stream state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   708
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   709
00696c1450da enable png support under win32
koda
parents:
diff changeset
   710
ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   711
                                         gz_headerp head));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   712
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   713
     deflateSetHeader() provides gzip header information for when a gzip
00696c1450da enable png support under win32
koda
parents:
diff changeset
   714
   stream is requested by deflateInit2().  deflateSetHeader() may be called
00696c1450da enable png support under win32
koda
parents:
diff changeset
   715
   after deflateInit2() or deflateReset() and before the first call of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   716
   deflate().  The text, time, os, extra field, name, and comment information
00696c1450da enable png support under win32
koda
parents:
diff changeset
   717
   in the provided gz_header structure are written to the gzip header (xflag is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   718
   ignored -- the extra flags are set according to the compression level).  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   719
   caller must assure that, if not Z_NULL, name and comment are terminated with
00696c1450da enable png support under win32
koda
parents:
diff changeset
   720
   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
00696c1450da enable png support under win32
koda
parents:
diff changeset
   721
   available there.  If hcrc is true, a gzip header crc is included.  Note that
00696c1450da enable png support under win32
koda
parents:
diff changeset
   722
   the current versions of the command-line version of gzip (up through version
00696c1450da enable png support under win32
koda
parents:
diff changeset
   723
   1.3.x) do not support header crc's, and will report that it is a "multi-part
00696c1450da enable png support under win32
koda
parents:
diff changeset
   724
   gzip file" and give up.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   725
00696c1450da enable png support under win32
koda
parents:
diff changeset
   726
     If deflateSetHeader is not used, the default gzip header has text false,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   727
   the time set to zero, and os set to 255, with no extra, name, or comment
00696c1450da enable png support under win32
koda
parents:
diff changeset
   728
   fields.  The gzip header is returned to the default state by deflateReset().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   729
00696c1450da enable png support under win32
koda
parents:
diff changeset
   730
     deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   731
   stream state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   732
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   733
00696c1450da enable png support under win32
koda
parents:
diff changeset
   734
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   735
ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   736
                                     int  windowBits));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   737
00696c1450da enable png support under win32
koda
parents:
diff changeset
   738
     This is another version of inflateInit with an extra parameter.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   739
   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
00696c1450da enable png support under win32
koda
parents:
diff changeset
   740
   before by the caller.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   741
00696c1450da enable png support under win32
koda
parents:
diff changeset
   742
     The windowBits parameter is the base two logarithm of the maximum window
00696c1450da enable png support under win32
koda
parents:
diff changeset
   743
   size (the size of the history buffer).  It should be in the range 8..15 for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   744
   this version of the library.  The default value is 15 if inflateInit is used
00696c1450da enable png support under win32
koda
parents:
diff changeset
   745
   instead.  windowBits must be greater than or equal to the windowBits value
00696c1450da enable png support under win32
koda
parents:
diff changeset
   746
   provided to deflateInit2() while compressing, or it must be equal to 15 if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   747
   deflateInit2() was not used.  If a compressed stream with a larger window
00696c1450da enable png support under win32
koda
parents:
diff changeset
   748
   size is given as input, inflate() will return with the error code
00696c1450da enable png support under win32
koda
parents:
diff changeset
   749
   Z_DATA_ERROR instead of trying to allocate a larger window.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   750
00696c1450da enable png support under win32
koda
parents:
diff changeset
   751
     windowBits can also be zero to request that inflate use the window size in
00696c1450da enable png support under win32
koda
parents:
diff changeset
   752
   the zlib header of the compressed stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   753
00696c1450da enable png support under win32
koda
parents:
diff changeset
   754
     windowBits can also be -8..-15 for raw inflate.  In this case, -windowBits
00696c1450da enable png support under win32
koda
parents:
diff changeset
   755
   determines the window size.  inflate() will then process raw deflate data,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   756
   not looking for a zlib or gzip header, not generating a check value, and not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   757
   looking for any check values for comparison at the end of the stream.  This
00696c1450da enable png support under win32
koda
parents:
diff changeset
   758
   is for use with other formats that use the deflate compressed data format
00696c1450da enable png support under win32
koda
parents:
diff changeset
   759
   such as zip.  Those formats provide their own check values.  If a custom
00696c1450da enable png support under win32
koda
parents:
diff changeset
   760
   format is developed using the raw deflate format for compressed data, it is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   761
   recommended that a check value such as an adler32 or a crc32 be applied to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   762
   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
00696c1450da enable png support under win32
koda
parents:
diff changeset
   763
   most applications, the zlib format should be used as is.  Note that comments
00696c1450da enable png support under win32
koda
parents:
diff changeset
   764
   above on the use in deflateInit2() applies to the magnitude of windowBits.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   765
00696c1450da enable png support under win32
koda
parents:
diff changeset
   766
     windowBits can also be greater than 15 for optional gzip decoding.  Add
00696c1450da enable png support under win32
koda
parents:
diff changeset
   767
   32 to windowBits to enable zlib and gzip decoding with automatic header
00696c1450da enable png support under win32
koda
parents:
diff changeset
   768
   detection, or add 16 to decode only the gzip format (the zlib format will
00696c1450da enable png support under win32
koda
parents:
diff changeset
   769
   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   770
   crc32 instead of an adler32.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   771
00696c1450da enable png support under win32
koda
parents:
diff changeset
   772
     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
00696c1450da enable png support under win32
koda
parents:
diff changeset
   773
   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   774
   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
00696c1450da enable png support under win32
koda
parents:
diff changeset
   775
   invalid, such as a null pointer to the structure.  msg is set to null if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   776
   there is no error message.  inflateInit2 does not perform any decompression
00696c1450da enable png support under win32
koda
parents:
diff changeset
   777
   apart from possibly reading the zlib header if present: actual decompression
00696c1450da enable png support under win32
koda
parents:
diff changeset
   778
   will be done by inflate().  (So next_in and avail_in may be modified, but
00696c1450da enable png support under win32
koda
parents:
diff changeset
   779
   next_out and avail_out are unused and unchanged.) The current implementation
00696c1450da enable png support under win32
koda
parents:
diff changeset
   780
   of inflateInit2() does not process any header information -- that is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   781
   deferred until inflate() is called.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   782
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   783
00696c1450da enable png support under win32
koda
parents:
diff changeset
   784
ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   785
                                             const Bytef *dictionary,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   786
                                             uInt  dictLength));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   787
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   788
     Initializes the decompression dictionary from the given uncompressed byte
00696c1450da enable png support under win32
koda
parents:
diff changeset
   789
   sequence.  This function must be called immediately after a call of inflate,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   790
   if that call returned Z_NEED_DICT.  The dictionary chosen by the compressor
00696c1450da enable png support under win32
koda
parents:
diff changeset
   791
   can be determined from the adler32 value returned by that call of inflate.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   792
   The compressor and decompressor must use exactly the same dictionary (see
00696c1450da enable png support under win32
koda
parents:
diff changeset
   793
   deflateSetDictionary).  For raw inflate, this function can be called
00696c1450da enable png support under win32
koda
parents:
diff changeset
   794
   immediately after inflateInit2() or inflateReset() and before any call of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   795
   inflate() to set the dictionary.  The application must insure that the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   796
   dictionary that was used for compression is provided.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   797
00696c1450da enable png support under win32
koda
parents:
diff changeset
   798
     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
00696c1450da enable png support under win32
koda
parents:
diff changeset
   799
   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   800
   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   801
   expected one (incorrect adler32 value).  inflateSetDictionary does not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   802
   perform any decompression: this will be done by subsequent calls of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   803
   inflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   804
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   805
00696c1450da enable png support under win32
koda
parents:
diff changeset
   806
ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   807
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   808
     Skips invalid compressed data until a full flush point (see above the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   809
   description of deflate with Z_FULL_FLUSH) can be found, or until all
00696c1450da enable png support under win32
koda
parents:
diff changeset
   810
   available input is skipped.  No output is provided.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   811
00696c1450da enable png support under win32
koda
parents:
diff changeset
   812
     inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
00696c1450da enable png support under win32
koda
parents:
diff changeset
   813
   if no more input was provided, Z_DATA_ERROR if no flush point has been
00696c1450da enable png support under win32
koda
parents:
diff changeset
   814
   found, or Z_STREAM_ERROR if the stream structure was inconsistent.  In the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   815
   success case, the application may save the current current value of total_in
00696c1450da enable png support under win32
koda
parents:
diff changeset
   816
   which indicates where valid compressed data was found.  In the error case,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   817
   the application may repeatedly call inflateSync, providing more input each
00696c1450da enable png support under win32
koda
parents:
diff changeset
   818
   time, until success or end of the input data.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   819
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   820
00696c1450da enable png support under win32
koda
parents:
diff changeset
   821
ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   822
                                    z_streamp source));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   823
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   824
     Sets the destination stream as a complete copy of the source stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   825
00696c1450da enable png support under win32
koda
parents:
diff changeset
   826
     This function can be useful when randomly accessing a large stream.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   827
   first pass through the stream can periodically record the inflate state,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   828
   allowing restarting inflate at those points when randomly accessing the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   829
   stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   830
00696c1450da enable png support under win32
koda
parents:
diff changeset
   831
     inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   832
   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
00696c1450da enable png support under win32
koda
parents:
diff changeset
   833
   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   834
   destination.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   835
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   836
00696c1450da enable png support under win32
koda
parents:
diff changeset
   837
ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   838
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   839
     This function is equivalent to inflateEnd followed by inflateInit,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   840
   but does not free and reallocate all the internal decompression state.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
   841
   stream will keep attributes that may have been set by inflateInit2.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   842
00696c1450da enable png support under win32
koda
parents:
diff changeset
   843
     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   844
   stream state was inconsistent (such as zalloc or state being Z_NULL).
00696c1450da enable png support under win32
koda
parents:
diff changeset
   845
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   846
00696c1450da enable png support under win32
koda
parents:
diff changeset
   847
ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   848
                                      int windowBits));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   849
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   850
     This function is the same as inflateReset, but it also permits changing
00696c1450da enable png support under win32
koda
parents:
diff changeset
   851
   the wrap and window size requests.  The windowBits parameter is interpreted
00696c1450da enable png support under win32
koda
parents:
diff changeset
   852
   the same as it is for inflateInit2.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   853
00696c1450da enable png support under win32
koda
parents:
diff changeset
   854
     inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   855
   stream state was inconsistent (such as zalloc or state being Z_NULL), or if
00696c1450da enable png support under win32
koda
parents:
diff changeset
   856
   the windowBits parameter is invalid.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   857
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   858
00696c1450da enable png support under win32
koda
parents:
diff changeset
   859
ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   860
                                     int bits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   861
                                     int value));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   862
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   863
     This function inserts bits in the inflate input stream.  The intent is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   864
   that this function is used to start inflating at a bit position in the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   865
   middle of a byte.  The provided bits will be used before any bytes are used
00696c1450da enable png support under win32
koda
parents:
diff changeset
   866
   from next_in.  This function should only be used with raw inflate, and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   867
   should be used before the first inflate() call after inflateInit2() or
00696c1450da enable png support under win32
koda
parents:
diff changeset
   868
   inflateReset().  bits must be less than or equal to 16, and that many of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   869
   least significant bits of value will be inserted in the input.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   870
00696c1450da enable png support under win32
koda
parents:
diff changeset
   871
     If bits is negative, then the input stream bit buffer is emptied.  Then
00696c1450da enable png support under win32
koda
parents:
diff changeset
   872
   inflatePrime() can be called again to put bits in the buffer.  This is used
00696c1450da enable png support under win32
koda
parents:
diff changeset
   873
   to clear out bits leftover after feeding inflate a block description prior
00696c1450da enable png support under win32
koda
parents:
diff changeset
   874
   to feeding inflate codes.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   875
00696c1450da enable png support under win32
koda
parents:
diff changeset
   876
     inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   877
   stream state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   878
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   879
00696c1450da enable png support under win32
koda
parents:
diff changeset
   880
ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   881
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   882
     This function returns two values, one in the lower 16 bits of the return
00696c1450da enable png support under win32
koda
parents:
diff changeset
   883
   value, and the other in the remaining upper bits, obtained by shifting the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   884
   return value down 16 bits.  If the upper value is -1 and the lower value is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   885
   zero, then inflate() is currently decoding information outside of a block.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   886
   If the upper value is -1 and the lower value is non-zero, then inflate is in
00696c1450da enable png support under win32
koda
parents:
diff changeset
   887
   the middle of a stored block, with the lower value equaling the number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   888
   bytes from the input remaining to copy.  If the upper value is not -1, then
00696c1450da enable png support under win32
koda
parents:
diff changeset
   889
   it is the number of bits back from the current bit position in the input of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   890
   the code (literal or length/distance pair) currently being processed.  In
00696c1450da enable png support under win32
koda
parents:
diff changeset
   891
   that case the lower value is the number of bytes already emitted for that
00696c1450da enable png support under win32
koda
parents:
diff changeset
   892
   code.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   893
00696c1450da enable png support under win32
koda
parents:
diff changeset
   894
     A code is being processed if inflate is waiting for more input to complete
00696c1450da enable png support under win32
koda
parents:
diff changeset
   895
   decoding of the code, or if it has completed decoding but is waiting for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   896
   more output space to write the literal or match data.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   897
00696c1450da enable png support under win32
koda
parents:
diff changeset
   898
     inflateMark() is used to mark locations in the input data for random
00696c1450da enable png support under win32
koda
parents:
diff changeset
   899
   access, which may be at bit positions, and to note those cases where the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   900
   output of a code may span boundaries of random access blocks.  The current
00696c1450da enable png support under win32
koda
parents:
diff changeset
   901
   location in the input stream can be determined from avail_in and data_type
00696c1450da enable png support under win32
koda
parents:
diff changeset
   902
   as noted in the description for the Z_BLOCK flush parameter for inflate.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   903
00696c1450da enable png support under win32
koda
parents:
diff changeset
   904
     inflateMark returns the value noted above or -1 << 16 if the provided
00696c1450da enable png support under win32
koda
parents:
diff changeset
   905
   source stream state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   906
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   907
00696c1450da enable png support under win32
koda
parents:
diff changeset
   908
ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   909
                                         gz_headerp head));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   910
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   911
     inflateGetHeader() requests that gzip header information be stored in the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   912
   provided gz_header structure.  inflateGetHeader() may be called after
00696c1450da enable png support under win32
koda
parents:
diff changeset
   913
   inflateInit2() or inflateReset(), and before the first call of inflate().
00696c1450da enable png support under win32
koda
parents:
diff changeset
   914
   As inflate() processes the gzip stream, head->done is zero until the header
00696c1450da enable png support under win32
koda
parents:
diff changeset
   915
   is completed, at which time head->done is set to one.  If a zlib stream is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   916
   being decoded, then head->done is set to -1 to indicate that there will be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   917
   no gzip header information forthcoming.  Note that Z_BLOCK or Z_TREES can be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   918
   used to force inflate() to return immediately after header processing is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   919
   complete and before any actual data is decompressed.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   920
00696c1450da enable png support under win32
koda
parents:
diff changeset
   921
     The text, time, xflags, and os fields are filled in with the gzip header
00696c1450da enable png support under win32
koda
parents:
diff changeset
   922
   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
00696c1450da enable png support under win32
koda
parents:
diff changeset
   923
   was valid if done is set to one.) If extra is not Z_NULL, then extra_max
00696c1450da enable png support under win32
koda
parents:
diff changeset
   924
   contains the maximum number of bytes to write to extra.  Once done is true,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   925
   extra_len contains the actual extra field length, and extra contains the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   926
   extra field, or that field truncated if extra_max is less than extra_len.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   927
   If name is not Z_NULL, then up to name_max characters are written there,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   928
   terminated with a zero unless the length is greater than name_max.  If
00696c1450da enable png support under win32
koda
parents:
diff changeset
   929
   comment is not Z_NULL, then up to comm_max characters are written there,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   930
   terminated with a zero unless the length is greater than comm_max.  When any
00696c1450da enable png support under win32
koda
parents:
diff changeset
   931
   of extra, name, or comment are not Z_NULL and the respective field is not
00696c1450da enable png support under win32
koda
parents:
diff changeset
   932
   present in the header, then that field is set to Z_NULL to signal its
00696c1450da enable png support under win32
koda
parents:
diff changeset
   933
   absence.  This allows the use of deflateSetHeader() with the returned
00696c1450da enable png support under win32
koda
parents:
diff changeset
   934
   structure to duplicate the header.  However if those fields are set to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   935
   allocated memory, then the application will need to save those pointers
00696c1450da enable png support under win32
koda
parents:
diff changeset
   936
   elsewhere so that they can be eventually freed.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   937
00696c1450da enable png support under win32
koda
parents:
diff changeset
   938
     If inflateGetHeader is not used, then the header information is simply
00696c1450da enable png support under win32
koda
parents:
diff changeset
   939
   discarded.  The header is always checked for validity, including the header
00696c1450da enable png support under win32
koda
parents:
diff changeset
   940
   CRC if present.  inflateReset() will reset the process to discard the header
00696c1450da enable png support under win32
koda
parents:
diff changeset
   941
   information.  The application would need to call inflateGetHeader() again to
00696c1450da enable png support under win32
koda
parents:
diff changeset
   942
   retrieve the header from the next gzip stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   943
00696c1450da enable png support under win32
koda
parents:
diff changeset
   944
     inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
00696c1450da enable png support under win32
koda
parents:
diff changeset
   945
   stream state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   946
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   947
00696c1450da enable png support under win32
koda
parents:
diff changeset
   948
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   949
ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   950
                                        unsigned char FAR *window));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   951
00696c1450da enable png support under win32
koda
parents:
diff changeset
   952
     Initialize the internal stream state for decompression using inflateBack()
00696c1450da enable png support under win32
koda
parents:
diff changeset
   953
   calls.  The fields zalloc, zfree and opaque in strm must be initialized
00696c1450da enable png support under win32
koda
parents:
diff changeset
   954
   before the call.  If zalloc and zfree are Z_NULL, then the default library-
00696c1450da enable png support under win32
koda
parents:
diff changeset
   955
   derived memory allocation routines are used.  windowBits is the base two
00696c1450da enable png support under win32
koda
parents:
diff changeset
   956
   logarithm of the window size, in the range 8..15.  window is a caller
00696c1450da enable png support under win32
koda
parents:
diff changeset
   957
   supplied buffer of that size.  Except for special applications where it is
00696c1450da enable png support under win32
koda
parents:
diff changeset
   958
   assured that deflate was used with small window sizes, windowBits must be 15
00696c1450da enable png support under win32
koda
parents:
diff changeset
   959
   and a 32K byte window must be supplied to be able to decompress general
00696c1450da enable png support under win32
koda
parents:
diff changeset
   960
   deflate streams.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   961
00696c1450da enable png support under win32
koda
parents:
diff changeset
   962
     See inflateBack() for the usage of these routines.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   963
00696c1450da enable png support under win32
koda
parents:
diff changeset
   964
     inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
00696c1450da enable png support under win32
koda
parents:
diff changeset
   965
   the paramaters are invalid, Z_MEM_ERROR if the internal state could not be
00696c1450da enable png support under win32
koda
parents:
diff changeset
   966
   allocated, or Z_VERSION_ERROR if the version of the library does not match
00696c1450da enable png support under win32
koda
parents:
diff changeset
   967
   the version of the header file.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   968
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
   969
00696c1450da enable png support under win32
koda
parents:
diff changeset
   970
typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   971
typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   972
00696c1450da enable png support under win32
koda
parents:
diff changeset
   973
ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   974
                                    in_func in, void FAR *in_desc,
00696c1450da enable png support under win32
koda
parents:
diff changeset
   975
                                    out_func out, void FAR *out_desc));
00696c1450da enable png support under win32
koda
parents:
diff changeset
   976
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
   977
     inflateBack() does a raw inflate with a single call using a call-back
00696c1450da enable png support under win32
koda
parents:
diff changeset
   978
   interface for input and output.  This is more efficient than inflate() for
00696c1450da enable png support under win32
koda
parents:
diff changeset
   979
   file i/o applications in that it avoids copying between the output and the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   980
   sliding window by simply making the window itself the output buffer.  This
00696c1450da enable png support under win32
koda
parents:
diff changeset
   981
   function trusts the application to not change the output buffer passed by
00696c1450da enable png support under win32
koda
parents:
diff changeset
   982
   the output function, at least until inflateBack() returns.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   983
00696c1450da enable png support under win32
koda
parents:
diff changeset
   984
     inflateBackInit() must be called first to allocate the internal state
00696c1450da enable png support under win32
koda
parents:
diff changeset
   985
   and to initialize the state with the user-provided window buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   986
   inflateBack() may then be used multiple times to inflate a complete, raw
00696c1450da enable png support under win32
koda
parents:
diff changeset
   987
   deflate stream with each call.  inflateBackEnd() is then called to free the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   988
   allocated state.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   989
00696c1450da enable png support under win32
koda
parents:
diff changeset
   990
     A raw deflate stream is one with no zlib or gzip header or trailer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   991
   This routine would normally be used in a utility that reads zip or gzip
00696c1450da enable png support under win32
koda
parents:
diff changeset
   992
   files and writes out uncompressed files.  The utility would decode the
00696c1450da enable png support under win32
koda
parents:
diff changeset
   993
   header and process the trailer on its own, hence this routine expects only
00696c1450da enable png support under win32
koda
parents:
diff changeset
   994
   the raw deflate stream to decompress.  This is different from the normal
00696c1450da enable png support under win32
koda
parents:
diff changeset
   995
   behavior of inflate(), which expects either a zlib or gzip header and
00696c1450da enable png support under win32
koda
parents:
diff changeset
   996
   trailer around the deflate stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
   997
00696c1450da enable png support under win32
koda
parents:
diff changeset
   998
     inflateBack() uses two subroutines supplied by the caller that are then
00696c1450da enable png support under win32
koda
parents:
diff changeset
   999
   called by inflateBack() for input and output.  inflateBack() calls those
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1000
   routines until it reads a complete deflate stream and writes out all of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1001
   uncompressed data, or until it encounters an error.  The function's
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1002
   parameters and return types are defined above in the in_func and out_func
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1003
   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1004
   number of bytes of provided input, and a pointer to that input in buf.  If
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1005
   there is no input available, in() must return zero--buf is ignored in that
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1006
   case--and inflateBack() will return a buffer error.  inflateBack() will call
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1007
   out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].  out()
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1008
   should return zero on success, or non-zero on failure.  If out() returns
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1009
   non-zero, inflateBack() will return with an error.  Neither in() nor out()
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1010
   are permitted to change the contents of the window provided to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1011
   inflateBackInit(), which is also the buffer that out() uses to write from.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1012
   The length written by out() will be at most the window size.  Any non-zero
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1013
   amount of input may be provided by in().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1014
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1015
     For convenience, inflateBack() can be provided input on the first call by
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1016
   setting strm->next_in and strm->avail_in.  If that input is exhausted, then
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1017
   in() will be called.  Therefore strm->next_in must be initialized before
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1018
   calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1019
   immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1020
   must also be initialized, and then if strm->avail_in is not zero, input will
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1021
   initially be taken from strm->next_in[0 ..  strm->avail_in - 1].
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1022
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1023
     The in_desc and out_desc parameters of inflateBack() is passed as the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1024
   first parameter of in() and out() respectively when they are called.  These
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1025
   descriptors can be optionally used to pass any information that the caller-
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1026
   supplied in() and out() functions need to do their job.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1027
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1028
     On return, inflateBack() will set strm->next_in and strm->avail_in to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1029
   pass back any unused input that was provided by the last in() call.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1030
   return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1031
   if in() or out() returned an error, Z_DATA_ERROR if there was a format error
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1032
   in the deflate stream (in which case strm->msg is set to indicate the nature
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1033
   of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1034
   In the case of Z_BUF_ERROR, an input or output error can be distinguished
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1035
   using strm->next_in which will be Z_NULL only if in() returned an error.  If
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1036
   strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1037
   non-zero.  (in() will always be called before out(), so strm->next_in is
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1038
   assured to be defined if out() returns non-zero.) Note that inflateBack()
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1039
   cannot return Z_OK.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1040
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1041
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1042
ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1043
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1044
     All memory allocated by inflateBackInit() is freed.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1045
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1046
     inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1047
   state was inconsistent.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1048
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1049
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1050
ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1051
/* Return flags indicating compile-time options.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1052
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1053
    Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1054
     1.0: size of uInt
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1055
     3.2: size of uLong
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1056
     5.4: size of voidpf (pointer)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1057
     7.6: size of z_off_t
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1058
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1059
    Compiler, assembler, and debug options:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1060
     8: DEBUG
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1061
     9: ASMV or ASMINF -- use ASM code
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1062
     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1063
     11: 0 (reserved)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1064
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1065
    One-time table building (smaller code, but not thread-safe if true):
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1066
     12: BUILDFIXED -- build static block decoding tables when needed
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1067
     13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1068
     14,15: 0 (reserved)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1069
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1070
    Library content (indicates missing functionality):
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1071
     16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1072
                          deflate code when not needed)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1073
     17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1074
                    and decode gzip streams (to avoid linking crc code)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1075
     18-19: 0 (reserved)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1076
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1077
    Operation variations (changes in library functionality):
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1078
     20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1079
     21: FASTEST -- deflate algorithm with only one, lowest compression level
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1080
     22,23: 0 (reserved)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1081
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1082
    The sprintf variant used by gzprintf (zero is best):
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1083
     24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1084
     25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1085
     26: 0 = returns value, 1 = void -- 1 means inferred string length returned
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1086
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1087
    Remainder:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1088
     27-31: 0 (reserved)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1089
 */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1090
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1091
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1092
                        /* utility functions */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1093
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1094
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1095
     The following utility functions are implemented on top of the basic
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1096
   stream-oriented functions.  To simplify the interface, some default options
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1097
   are assumed (compression level and memory usage, standard memory allocation
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1098
   functions).  The source code of these utility functions can be modified if
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1099
   you need special options.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1100
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1101
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1102
ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1103
                                 const Bytef *source, uLong sourceLen));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1104
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1105
     Compresses the source buffer into the destination buffer.  sourceLen is
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1106
   the byte length of the source buffer.  Upon entry, destLen is the total size
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1107
   of the destination buffer, which must be at least the value returned by
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1108
   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1109
   compressed buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1110
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1111
     compress returns Z_OK if success, Z_MEM_ERROR if there was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1112
   enough memory, Z_BUF_ERROR if there was not enough room in the output
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1113
   buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1114
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1115
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1116
ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1117
                                  const Bytef *source, uLong sourceLen,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1118
                                  int level));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1119
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1120
     Compresses the source buffer into the destination buffer.  The level
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1121
   parameter has the same meaning as in deflateInit.  sourceLen is the byte
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1122
   length of the source buffer.  Upon entry, destLen is the total size of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1123
   destination buffer, which must be at least the value returned by
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1124
   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1125
   compressed buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1126
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1127
     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1128
   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1129
   Z_STREAM_ERROR if the level parameter is invalid.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1130
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1131
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1132
ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1133
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1134
     compressBound() returns an upper bound on the compressed size after
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1135
   compress() or compress2() on sourceLen bytes.  It would be used before a
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1136
   compress() or compress2() call to allocate the destination buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1137
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1138
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1139
ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1140
                                   const Bytef *source, uLong sourceLen));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1141
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1142
     Decompresses the source buffer into the destination buffer.  sourceLen is
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1143
   the byte length of the source buffer.  Upon entry, destLen is the total size
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1144
   of the destination buffer, which must be large enough to hold the entire
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1145
   uncompressed data.  (The size of the uncompressed data must have been saved
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1146
   previously by the compressor and transmitted to the decompressor by some
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1147
   mechanism outside the scope of this compression library.) Upon exit, destLen
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1148
   is the actual size of the uncompressed buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1149
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1150
     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1151
   enough memory, Z_BUF_ERROR if there was not enough room in the output
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1152
   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1153
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1154
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1155
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1156
                        /* gzip file access functions */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1157
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1158
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1159
     This library supports reading and writing files in gzip (.gz) format with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1160
   an interface similar to that of stdio, using the functions that start with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1161
   "gz".  The gzip format is different from the zlib format.  gzip is a gzip
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1162
   wrapper, documented in RFC 1952, wrapped around a deflate stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1163
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1164
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1165
typedef voidp gzFile;       /* opaque gzip file descriptor */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1166
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1167
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1168
ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1169
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1170
     Opens a gzip (.gz) file for reading or writing.  The mode parameter is as
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1171
   in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1172
   a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1173
   compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1174
   for fixed code compression as in "wb9F".  (See the description of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1175
   deflateInit2 for more information about the strategy parameter.) Also "a"
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1176
   can be used instead of "w" to request that the gzip stream that will be
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1177
   written be appended to the file.  "+" will result in an error, since reading
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1178
   and writing to the same gzip file is not supported.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1179
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1180
     gzopen can be used to read a file which is not in gzip format; in this
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1181
   case gzread will directly read from the file without decompression.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1182
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1183
     gzopen returns NULL if the file could not be opened, if there was
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1184
   insufficient memory to allocate the gzFile state, or if an invalid mode was
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1185
   specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1186
   errno can be checked to determine if the reason gzopen failed was that the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1187
   file could not be opened.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1188
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1189
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1190
ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1191
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1192
     gzdopen associates a gzFile with the file descriptor fd.  File descriptors
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1193
   are obtained from calls like open, dup, creat, pipe or fileno (if the file
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1194
   has been previously opened with fopen).  The mode parameter is as in gzopen.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1195
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1196
     The next call of gzclose on the returned gzFile will also close the file
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1197
   descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1198
   fd.  If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1199
   mode);.  The duplicated descriptor should be saved to avoid a leak, since
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1200
   gzdopen does not close fd if it fails.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1201
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1202
     gzdopen returns NULL if there was insufficient memory to allocate the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1203
   gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1204
   provided, or '+' was provided), or if fd is -1.  The file descriptor is not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1205
   used until the next gz* read, write, seek, or close operation, so gzdopen
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1206
   will not detect if fd is invalid (unless fd is -1).
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1207
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1208
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1209
ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1210
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1211
     Set the internal buffer size used by this library's functions.  The
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1212
   default buffer size is 8192 bytes.  This function must be called after
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1213
   gzopen() or gzdopen(), and before any other calls that read or write the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1214
   file.  The buffer memory allocation is always deferred to the first read or
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1215
   write.  Two buffers are allocated, either both of the specified size when
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1216
   writing, or one of the specified size and the other twice that size when
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1217
   reading.  A larger buffer size of, for example, 64K or 128K bytes will
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1218
   noticeably increase the speed of decompression (reading).
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1219
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1220
     The new buffer size also affects the maximum length for gzprintf().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1221
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1222
     gzbuffer() returns 0 on success, or -1 on failure, such as being called
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1223
   too late.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1224
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1225
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1226
ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1227
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1228
     Dynamically update the compression level or strategy.  See the description
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1229
   of deflateInit2 for the meaning of these parameters.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1230
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1231
     gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1232
   opened for writing.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1233
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1234
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1235
ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1236
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1237
     Reads the given number of uncompressed bytes from the compressed file.  If
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1238
   the input file was not in gzip format, gzread copies the given number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1239
   bytes into the buffer.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1240
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1241
     After reaching the end of a gzip stream in the input, gzread will continue
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1242
   to read, looking for another gzip stream, or failing that, reading the rest
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1243
   of the input file directly without decompression.  The entire input file
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1244
   will be read if gzread is called until it returns less than the requested
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1245
   len.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1246
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1247
     gzread returns the number of uncompressed bytes actually read, less than
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1248
   len for end of file, or -1 for error.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1249
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1250
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1251
ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1252
                                voidpc buf, unsigned len));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1253
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1254
     Writes the given number of uncompressed bytes into the compressed file.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1255
   gzwrite returns the number of uncompressed bytes written or 0 in case of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1256
   error.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1257
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1258
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1259
ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1260
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1261
     Converts, formats, and writes the arguments to the compressed file under
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1262
   control of the format string, as in fprintf.  gzprintf returns the number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1263
   uncompressed bytes actually written, or 0 in case of error.  The number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1264
   uncompressed bytes written is limited to 8191, or one less than the buffer
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1265
   size given to gzbuffer().  The caller should assure that this limit is not
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1266
   exceeded.  If it is exceeded, then gzprintf() will return an error (0) with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1267
   nothing written.  In this case, there may also be a buffer overflow with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1268
   unpredictable consequences, which is possible only if zlib was compiled with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1269
   the insecure functions sprintf() or vsprintf() because the secure snprintf()
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1270
   or vsnprintf() functions were not available.  This can be determined using
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1271
   zlibCompileFlags().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1272
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1273
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1274
ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1275
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1276
     Writes the given null-terminated string to the compressed file, excluding
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1277
   the terminating null character.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1278
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1279
     gzputs returns the number of characters written, or -1 in case of error.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1280
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1281
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1282
ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1283
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1284
     Reads bytes from the compressed file until len-1 characters are read, or a
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1285
   newline character is read and transferred to buf, or an end-of-file
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1286
   condition is encountered.  If any characters are read or if len == 1, the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1287
   string is terminated with a null character.  If no characters are read due
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1288
   to an end-of-file or len < 1, then the buffer is left untouched.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1289
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1290
     gzgets returns buf which is a null-terminated string, or it returns NULL
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1291
   for end-of-file or in case of error.  If there was an error, the contents at
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1292
   buf are indeterminate.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1293
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1294
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1295
ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1296
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1297
     Writes c, converted to an unsigned char, into the compressed file.  gzputc
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1298
   returns the value that was written, or -1 in case of error.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1299
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1300
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1301
ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1302
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1303
     Reads one byte from the compressed file.  gzgetc returns this byte or -1
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1304
   in case of end of file or error.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1305
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1306
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1307
ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1308
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1309
     Push one character back onto the stream to be read as the first character
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1310
   on the next read.  At least one character of push-back is allowed.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1311
   gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1312
   fail if c is -1, and may fail if a character has been pushed but not read
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1313
   yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1314
   output buffer size of pushed characters is allowed.  (See gzbuffer above.)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1315
   The pushed character will be discarded if the stream is repositioned with
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1316
   gzseek() or gzrewind().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1317
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1318
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1319
ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1320
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1321
     Flushes all pending output into the compressed file.  The parameter flush
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1322
   is as in the deflate() function.  The return value is the zlib error number
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1323
   (see function gzerror below).  gzflush is only permitted when writing.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1324
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1325
     If the flush parameter is Z_FINISH, the remaining data is written and the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1326
   gzip stream is completed in the output.  If gzwrite() is called again, a new
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1327
   gzip stream will be started in the output.  gzread() is able to read such
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1328
   concatented gzip streams.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1329
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1330
     gzflush should be called only when strictly necessary because it will
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1331
   degrade compression if called too often.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1332
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1333
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1334
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1335
ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1336
                                   z_off_t offset, int whence));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1337
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1338
     Sets the starting position for the next gzread or gzwrite on the given
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1339
   compressed file.  The offset represents a number of bytes in the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1340
   uncompressed data stream.  The whence parameter is defined as in lseek(2);
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1341
   the value SEEK_END is not supported.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1342
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1343
     If the file is opened for reading, this function is emulated but can be
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1344
   extremely slow.  If the file is opened for writing, only forward seeks are
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1345
   supported; gzseek then compresses a sequence of zeroes up to the new
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1346
   starting position.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1347
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1348
     gzseek returns the resulting offset location as measured in bytes from
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1349
   the beginning of the uncompressed stream, or -1 in case of error, in
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1350
   particular if the file is opened for writing and the new starting position
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1351
   would be before the current position.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1352
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1353
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1354
ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1355
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1356
     Rewinds the given file. This function is supported only for reading.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1357
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1358
     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1359
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1360
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1361
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1362
ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1363
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1364
     Returns the starting position for the next gzread or gzwrite on the given
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1365
   compressed file.  This position represents a number of bytes in the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1366
   uncompressed data stream, and is zero when starting, even if appending or
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1367
   reading a gzip stream from the middle of a file using gzdopen().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1368
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1369
     gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1370
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1371
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1372
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1373
ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1374
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1375
     Returns the current offset in the file being read or written.  This offset
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1376
   includes the count of bytes that precede the gzip stream, for example when
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1377
   appending or when using gzdopen() for reading.  When reading, the offset
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1378
   does not include as yet unused buffered input.  This information can be used
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1379
   for a progress indicator.  On error, gzoffset() returns -1.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1380
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1381
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1382
ZEXTERN int ZEXPORT gzeof OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1383
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1384
     Returns true (1) if the end-of-file indicator has been set while reading,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1385
   false (0) otherwise.  Note that the end-of-file indicator is set only if the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1386
   read tried to go past the end of the input, but came up short.  Therefore,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1387
   just like feof(), gzeof() may return false even if there is no more data to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1388
   read, in the event that the last read request was for the exact number of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1389
   bytes remaining in the input file.  This will happen if the input file size
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1390
   is an exact multiple of the buffer size.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1391
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1392
     If gzeof() returns true, then the read functions will return no more data,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1393
   unless the end-of-file indicator is reset by gzclearerr() and the input file
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1394
   has grown since the previous end of file was detected.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1395
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1396
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1397
ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1398
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1399
     Returns true (1) if file is being copied directly while reading, or false
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1400
   (0) if file is a gzip stream being decompressed.  This state can change from
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1401
   false to true while reading the input file if the end of a gzip stream is
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1402
   reached, but is followed by data that is not another gzip stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1403
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1404
     If the input file is empty, gzdirect() will return true, since the input
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1405
   does not contain a gzip stream.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1406
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1407
     If gzdirect() is used immediately after gzopen() or gzdopen() it will
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1408
   cause buffers to be allocated to allow reading the file to determine if it
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1409
   is a gzip file.  Therefore if gzbuffer() is used, it should be called before
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1410
   gzdirect().
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1411
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1412
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1413
ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1414
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1415
     Flushes all pending output if necessary, closes the compressed file and
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1416
   deallocates the (de)compression state.  Note that once file is closed, you
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1417
   cannot call gzerror with file, since its structures have been deallocated.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1418
   gzclose must not be called more than once on the same file, just as free
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1419
   must not be called more than once on the same allocation.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1420
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1421
     gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1422
   file operation error, or Z_OK on success.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1423
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1424
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1425
ZEXTERN int ZEXPORT gzclose_r OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1426
ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1427
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1428
     Same as gzclose(), but gzclose_r() is only for use when reading, and
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1429
   gzclose_w() is only for use when writing or appending.  The advantage to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1430
   using these instead of gzclose() is that they avoid linking in zlib
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1431
   compression or decompression code that is not used when only reading or only
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1432
   writing respectively.  If gzclose() is used, then both compression and
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1433
   decompression code will be included the application when linking to a static
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1434
   zlib library.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1435
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1436
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1437
ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1438
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1439
     Returns the error message for the last error which occurred on the given
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1440
   compressed file.  errnum is set to zlib error number.  If an error occurred
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1441
   in the file system and not in the compression library, errnum is set to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1442
   Z_ERRNO and the application may consult errno to get the exact error code.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1443
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1444
     The application must not modify the returned string.  Future calls to
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1445
   this function may invalidate the previously returned string.  If file is
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1446
   closed, then the string previously returned by gzerror will no longer be
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1447
   available.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1448
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1449
     gzerror() should be used to distinguish errors from end-of-file for those
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1450
   functions above that do not distinguish those cases in their return values.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1451
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1452
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1453
ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1454
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1455
     Clears the error and end-of-file flags for file.  This is analogous to the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1456
   clearerr() function in stdio.  This is useful for continuing to read a gzip
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1457
   file that is being written concurrently.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1458
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1459
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1460
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1461
                        /* checksum functions */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1462
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1463
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1464
     These functions are not related to compression but are exported
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1465
   anyway because they might be useful in applications using the compression
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1466
   library.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1467
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1468
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1469
ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1470
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1471
     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1472
   return the updated checksum.  If buf is Z_NULL, this function returns the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1473
   required initial value for the checksum.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1474
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1475
     An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1476
   much faster.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1477
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1478
   Usage example:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1479
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1480
     uLong adler = adler32(0L, Z_NULL, 0);
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1481
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1482
     while (read_buffer(buffer, length) != EOF) {
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1483
       adler = adler32(adler, buffer, length);
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1484
     }
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1485
     if (adler != original_adler) error();
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1486
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1487
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1488
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1489
ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1490
                                          z_off_t len2));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1491
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1492
     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1493
   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1494
   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1495
   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1496
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1497
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1498
ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1499
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1500
     Update a running CRC-32 with the bytes buf[0..len-1] and return the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1501
   updated CRC-32.  If buf is Z_NULL, this function returns the required
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1502
   initial value for the for the crc.  Pre- and post-conditioning (one's
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1503
   complement) is performed within this function so it shouldn't be done by the
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1504
   application.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1505
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1506
   Usage example:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1507
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1508
     uLong crc = crc32(0L, Z_NULL, 0);
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1509
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1510
     while (read_buffer(buffer, length) != EOF) {
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1511
       crc = crc32(crc, buffer, length);
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1512
     }
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1513
     if (crc != original_crc) error();
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1514
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1515
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1516
/*
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1517
ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1518
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1519
     Combine two CRC-32 check values into one.  For two sequences of bytes,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1520
   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1521
   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1522
   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1523
   len2.
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1524
*/
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1525
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1526
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1527
                        /* various hacks, don't look :) */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1528
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1529
/* deflateInit and inflateInit are macros to allow checking the zlib version
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1530
 * and the compiler's view of z_stream:
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1531
 */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1532
ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1533
                                     const char *version, int stream_size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1534
ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1535
                                     const char *version, int stream_size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1536
ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1537
                                      int windowBits, int memLevel,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1538
                                      int strategy, const char *version,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1539
                                      int stream_size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1540
ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1541
                                      const char *version, int stream_size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1542
ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1543
                                         unsigned char FAR *window,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1544
                                         const char *version,
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1545
                                         int stream_size));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1546
#define deflateInit(strm, level) \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1547
        deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1548
#define inflateInit(strm) \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1549
        inflateInit_((strm),                ZLIB_VERSION, sizeof(z_stream))
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1550
#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1551
        deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1552
                      (strategy),           ZLIB_VERSION, sizeof(z_stream))
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1553
#define inflateInit2(strm, windowBits) \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1554
        inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1555
#define inflateBackInit(strm, windowBits, window) \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1556
        inflateBackInit_((strm), (windowBits), (window), \
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1557
                                            ZLIB_VERSION, sizeof(z_stream))
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1558
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1559
/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1560
 * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1561
 * both are true, the application gets the *64 functions, and the regular
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1562
 * functions are changed to 64 bits) -- in case these are set on systems
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1563
 * without large file support, _LFS64_LARGEFILE must also be true
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1564
 */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1565
#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1566
   ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1567
   ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1568
   ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1569
   ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1570
   ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1571
   ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1572
#endif
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1573
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1574
#if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1575
#  define gzopen gzopen64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1576
#  define gzseek gzseek64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1577
#  define gztell gztell64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1578
#  define gzoffset gzoffset64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1579
#  define adler32_combine adler32_combine64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1580
#  define crc32_combine crc32_combine64
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1581
#  ifdef _LARGEFILE64_SOURCE
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1582
     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1583
     ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1584
     ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1585
     ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1586
     ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1587
     ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1588
#  endif
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1589
#else
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1590
   ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1591
   ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1592
   ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1593
   ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1594
   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1595
   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1596
#endif
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1597
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1598
/* hack for buggy compilers */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1599
#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1600
    struct internal_state {int dummy;};
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1601
#endif
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1602
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1603
/* undocumented functions */
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1604
ZEXTERN const char   * ZEXPORT zError           OF((int));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1605
ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1606
ZEXTERN const uLongf * ZEXPORT get_crc_table    OF((void));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1607
ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1608
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1609
#ifdef __cplusplus
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1610
}
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1611
#endif
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1612
00696c1450da enable png support under win32
koda
parents:
diff changeset
  1613
#endif /* ZLIB_H */