--- a/misc/libfreetype/src/gzip/ftgzip.c Thu Jul 25 23:16:06 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,688 +0,0 @@
-/***************************************************************************/
-/* */
-/* ftgzip.c */
-/* */
-/* FreeType support for .gz compressed files. */
-/* */
-/* This optional component relies on zlib. It should mainly be used to */
-/* parse compressed PCF fonts, as found with many X11 server */
-/* distributions. */
-/* */
-/* Copyright 2002-2006, 2009-2011 by */
-/* David Turner, Robert Wilhelm, and Werner Lemberg. */
-/* */
-/* This file is part of the FreeType project, and may only be used, */
-/* modified, and distributed under the terms of the FreeType project */
-/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
-/* this file you indicate that you have read the license and */
-/* understand and accept it fully. */
-/* */
-/***************************************************************************/
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_MEMORY_H
-#include FT_INTERNAL_STREAM_H
-#include FT_INTERNAL_DEBUG_H
-#include FT_GZIP_H
-#include FT_CONFIG_STANDARD_LIBRARY_H
-
-
-#include FT_MODULE_ERRORS_H
-
-#undef __FTERRORS_H__
-
-#define FT_ERR_PREFIX Gzip_Err_
-#define FT_ERR_BASE FT_Mod_Err_Gzip
-
-#include FT_ERRORS_H
-
-
-#ifdef FT_CONFIG_OPTION_USE_ZLIB
-
-#ifdef FT_CONFIG_OPTION_PIC
-#error "gzip code does not support PIC yet"
-#endif
-
-#ifdef FT_CONFIG_OPTION_SYSTEM_ZLIB
-
-#include <zlib.h>
-
-#else /* !FT_CONFIG_OPTION_SYSTEM_ZLIB */
-
- /* In this case, we include our own modified sources of the ZLib */
- /* within the "ftgzip" component. The modifications were necessary */
- /* to #include all files without conflicts, as well as preventing */
- /* the definition of "extern" functions that may cause linking */
- /* conflicts when a program is linked with both FreeType and the */
- /* original ZLib. */
-
-#define NO_DUMMY_DECL
-#ifndef USE_ZLIB_ZCALLOC
-#define MY_ZCALLOC /* prevent all zcalloc() & zfree() in zutils.c */
-#endif
-
-#include "zlib.h"
-
-#undef SLOW
-#define SLOW 1 /* we can't use asm-optimized sources here! */
-
- /* Urgh. `inflate_mask' must not be declared twice -- C++ doesn't like
- this. We temporarily disable it and load all necessary header files. */
-#define NO_INFLATE_MASK
-#include "zutil.h"
-#include "inftrees.h"
-#include "infblock.h"
-#include "infcodes.h"
-#include "infutil.h"
-#undef NO_INFLATE_MASK
-
- /* infutil.c must be included before infcodes.c */
-#include "zutil.c"
-#include "inftrees.c"
-#include "infutil.c"
-#include "infcodes.c"
-#include "infblock.c"
-#include "inflate.c"
-#include "adler32.c"
-
-#endif /* !FT_CONFIG_OPTION_SYSTEM_ZLIB */
-
-
-/***************************************************************************/
-/***************************************************************************/
-/***** *****/
-/***** Z L I B M E M O R Y M A N A G E M E N T *****/
-/***** *****/
-/***************************************************************************/
-/***************************************************************************/
-
- /* it is better to use FreeType memory routines instead of raw
- 'malloc/free' */
-
- static voidpf
- ft_gzip_alloc( FT_Memory memory,
- uInt items,
- uInt size )
- {
- FT_ULong sz = (FT_ULong)size * items;
- FT_Error error;
- FT_Pointer p = NULL;
-
-
- (void)FT_ALLOC( p, sz );
- return p;
- }
-
-
- static void
- ft_gzip_free( FT_Memory memory,
- voidpf address )
- {
- FT_MEM_FREE( address );
- }
-
-
-#if !defined( FT_CONFIG_OPTION_SYSTEM_ZLIB ) && !defined( USE_ZLIB_ZCALLOC )
-
- local voidpf
- zcalloc ( voidpf opaque,
- unsigned items,
- unsigned size )
- {
- return ft_gzip_alloc( (FT_Memory)opaque, items, size );
- }
-
- local void
- zcfree( voidpf opaque,
- voidpf ptr )
- {
- ft_gzip_free( (FT_Memory)opaque, ptr );
- }
-
-#endif /* !SYSTEM_ZLIB && !USE_ZLIB_ZCALLOC */
-
-
-/***************************************************************************/
-/***************************************************************************/
-/***** *****/
-/***** Z L I B F I L E D E S C R I P T O R *****/
-/***** *****/
-/***************************************************************************/
-/***************************************************************************/
-
-#define FT_GZIP_BUFFER_SIZE 4096
-
- typedef struct FT_GZipFileRec_
- {
- FT_Stream source; /* parent/source stream */
- FT_Stream stream; /* embedding stream */
- FT_Memory memory; /* memory allocator */
- z_stream zstream; /* zlib input stream */
-
- FT_ULong start; /* starting position, after .gz header */
- FT_Byte input[FT_GZIP_BUFFER_SIZE]; /* input read buffer */
-
- FT_Byte buffer[FT_GZIP_BUFFER_SIZE]; /* output buffer */
- FT_ULong pos; /* position in output */
- FT_Byte* cursor;
- FT_Byte* limit;
-
- } FT_GZipFileRec, *FT_GZipFile;
-
-
- /* gzip flag byte */
-#define FT_GZIP_ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
-#define FT_GZIP_HEAD_CRC 0x02 /* bit 1 set: header CRC present */
-#define FT_GZIP_EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
-#define FT_GZIP_ORIG_NAME 0x08 /* bit 3 set: original file name present */
-#define FT_GZIP_COMMENT 0x10 /* bit 4 set: file comment present */
-#define FT_GZIP_RESERVED 0xE0 /* bits 5..7: reserved */
-
-
- /* check and skip .gz header - we don't support `transparent' compression */
- static FT_Error
- ft_gzip_check_header( FT_Stream stream )
- {
- FT_Error error;
- FT_Byte head[4];
-
-
- if ( FT_STREAM_SEEK( 0 ) ||
- FT_STREAM_READ( head, 4 ) )
- goto Exit;
-
- /* head[0] && head[1] are the magic numbers; */
- /* head[2] is the method, and head[3] the flags */
- if ( head[0] != 0x1f ||
- head[1] != 0x8b ||
- head[2] != Z_DEFLATED ||
- (head[3] & FT_GZIP_RESERVED) )
- {
- error = Gzip_Err_Invalid_File_Format;
- goto Exit;
- }
-
- /* skip time, xflags and os code */
- (void)FT_STREAM_SKIP( 6 );
-
- /* skip the extra field */
- if ( head[3] & FT_GZIP_EXTRA_FIELD )
- {
- FT_UInt len;
-
-
- if ( FT_READ_USHORT_LE( len ) ||
- FT_STREAM_SKIP( len ) )
- goto Exit;
- }
-
- /* skip original file name */
- if ( head[3] & FT_GZIP_ORIG_NAME )
- for (;;)
- {
- FT_UInt c;
-
-
- if ( FT_READ_BYTE( c ) )
- goto Exit;
-
- if ( c == 0 )
- break;
- }
-
- /* skip .gz comment */
- if ( head[3] & FT_GZIP_COMMENT )
- for (;;)
- {
- FT_UInt c;
-
-
- if ( FT_READ_BYTE( c ) )
- goto Exit;
-
- if ( c == 0 )
- break;
- }
-
- /* skip CRC */
- if ( head[3] & FT_GZIP_HEAD_CRC )
- if ( FT_STREAM_SKIP( 2 ) )
- goto Exit;
-
- Exit:
- return error;
- }
-
-
- static FT_Error
- ft_gzip_file_init( FT_GZipFile zip,
- FT_Stream stream,
- FT_Stream source )
- {
- z_stream* zstream = &zip->zstream;
- FT_Error error = Gzip_Err_Ok;
-
-
- zip->stream = stream;
- zip->source = source;
- zip->memory = stream->memory;
-
- zip->limit = zip->buffer + FT_GZIP_BUFFER_SIZE;
- zip->cursor = zip->limit;
- zip->pos = 0;
-
- /* check and skip .gz header */
- {
- stream = source;
-
- error = ft_gzip_check_header( stream );
- if ( error )
- goto Exit;
-
- zip->start = FT_STREAM_POS();
- }
-
- /* initialize zlib -- there is no zlib header in the compressed stream */
- zstream->zalloc = (alloc_func)ft_gzip_alloc;
- zstream->zfree = (free_func) ft_gzip_free;
- zstream->opaque = stream->memory;
-
- zstream->avail_in = 0;
- zstream->next_in = zip->buffer;
-
- if ( inflateInit2( zstream, -MAX_WBITS ) != Z_OK ||
- zstream->next_in == NULL )
- error = Gzip_Err_Invalid_File_Format;
-
- Exit:
- return error;
- }
-
-
- static void
- ft_gzip_file_done( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
-
-
- inflateEnd( zstream );
-
- /* clear the rest */
- zstream->zalloc = NULL;
- zstream->zfree = NULL;
- zstream->opaque = NULL;
- zstream->next_in = NULL;
- zstream->next_out = NULL;
- zstream->avail_in = 0;
- zstream->avail_out = 0;
-
- zip->memory = NULL;
- zip->source = NULL;
- zip->stream = NULL;
- }
-
-
- static FT_Error
- ft_gzip_file_reset( FT_GZipFile zip )
- {
- FT_Stream stream = zip->source;
- FT_Error error;
-
-
- if ( !FT_STREAM_SEEK( zip->start ) )
- {
- z_stream* zstream = &zip->zstream;
-
-
- inflateReset( zstream );
-
- zstream->avail_in = 0;
- zstream->next_in = zip->input;
- zstream->avail_out = 0;
- zstream->next_out = zip->buffer;
-
- zip->limit = zip->buffer + FT_GZIP_BUFFER_SIZE;
- zip->cursor = zip->limit;
- zip->pos = 0;
- }
-
- return error;
- }
-
-
- static FT_Error
- ft_gzip_file_fill_input( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
- FT_Stream stream = zip->source;
- FT_ULong size;
-
-
- if ( stream->read )
- {
- size = stream->read( stream, stream->pos, zip->input,
- FT_GZIP_BUFFER_SIZE );
- if ( size == 0 )
- return Gzip_Err_Invalid_Stream_Operation;
- }
- else
- {
- size = stream->size - stream->pos;
- if ( size > FT_GZIP_BUFFER_SIZE )
- size = FT_GZIP_BUFFER_SIZE;
-
- if ( size == 0 )
- return Gzip_Err_Invalid_Stream_Operation;
-
- FT_MEM_COPY( zip->input, stream->base + stream->pos, size );
- }
- stream->pos += size;
-
- zstream->next_in = zip->input;
- zstream->avail_in = size;
-
- return Gzip_Err_Ok;
- }
-
-
- static FT_Error
- ft_gzip_file_fill_output( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
- FT_Error error = Gzip_Err_Ok;
-
-
- zip->cursor = zip->buffer;
- zstream->next_out = zip->cursor;
- zstream->avail_out = FT_GZIP_BUFFER_SIZE;
-
- while ( zstream->avail_out > 0 )
- {
- int err;
-
-
- if ( zstream->avail_in == 0 )
- {
- error = ft_gzip_file_fill_input( zip );
- if ( error )
- break;
- }
-
- err = inflate( zstream, Z_NO_FLUSH );
-
- if ( err == Z_STREAM_END )
- {
- zip->limit = zstream->next_out;
- if ( zip->limit == zip->cursor )
- error = Gzip_Err_Invalid_Stream_Operation;
- break;
- }
- else if ( err != Z_OK )
- {
- error = Gzip_Err_Invalid_Stream_Operation;
- break;
- }
- }
-
- return error;
- }
-
-
- /* fill output buffer; `count' must be <= FT_GZIP_BUFFER_SIZE */
- static FT_Error
- ft_gzip_file_skip_output( FT_GZipFile zip,
- FT_ULong count )
- {
- FT_Error error = Gzip_Err_Ok;
- FT_ULong delta;
-
-
- for (;;)
- {
- delta = (FT_ULong)( zip->limit - zip->cursor );
- if ( delta >= count )
- delta = count;
-
- zip->cursor += delta;
- zip->pos += delta;
-
- count -= delta;
- if ( count == 0 )
- break;
-
- error = ft_gzip_file_fill_output( zip );
- if ( error )
- break;
- }
-
- return error;
- }
-
-
- static FT_ULong
- ft_gzip_file_io( FT_GZipFile zip,
- FT_ULong pos,
- FT_Byte* buffer,
- FT_ULong count )
- {
- FT_ULong result = 0;
- FT_Error error;
-
-
- /* Reset inflate stream if we're seeking backwards. */
- /* Yes, that is not too efficient, but it saves memory :-) */
- if ( pos < zip->pos )
- {
- error = ft_gzip_file_reset( zip );
- if ( error )
- goto Exit;
- }
-
- /* skip unwanted bytes */
- if ( pos > zip->pos )
- {
- error = ft_gzip_file_skip_output( zip, (FT_ULong)( pos - zip->pos ) );
- if ( error )
- goto Exit;
- }
-
- if ( count == 0 )
- goto Exit;
-
- /* now read the data */
- for (;;)
- {
- FT_ULong delta;
-
-
- delta = (FT_ULong)( zip->limit - zip->cursor );
- if ( delta >= count )
- delta = count;
-
- FT_MEM_COPY( buffer, zip->cursor, delta );
- buffer += delta;
- result += delta;
- zip->cursor += delta;
- zip->pos += delta;
-
- count -= delta;
- if ( count == 0 )
- break;
-
- error = ft_gzip_file_fill_output( zip );
- if ( error )
- break;
- }
-
- Exit:
- return result;
- }
-
-
-/***************************************************************************/
-/***************************************************************************/
-/***** *****/
-/***** G Z E M B E D D I N G S T R E A M *****/
-/***** *****/
-/***************************************************************************/
-/***************************************************************************/
-
- static void
- ft_gzip_stream_close( FT_Stream stream )
- {
- FT_GZipFile zip = (FT_GZipFile)stream->descriptor.pointer;
- FT_Memory memory = stream->memory;
-
-
- if ( zip )
- {
- /* finalize gzip file descriptor */
- ft_gzip_file_done( zip );
-
- FT_FREE( zip );
-
- stream->descriptor.pointer = NULL;
- }
- }
-
-
- static FT_ULong
- ft_gzip_stream_io( FT_Stream stream,
- FT_ULong pos,
- FT_Byte* buffer,
- FT_ULong count )
- {
- FT_GZipFile zip = (FT_GZipFile)stream->descriptor.pointer;
-
-
- return ft_gzip_file_io( zip, pos, buffer, count );
- }
-
-
- static FT_ULong
- ft_gzip_get_uncompressed_size( FT_Stream stream )
- {
- FT_Error error;
- FT_ULong old_pos;
- FT_ULong result = 0;
-
-
- old_pos = stream->pos;
- if ( !FT_Stream_Seek( stream, stream->size - 4 ) )
- {
- result = FT_Stream_ReadULong( stream, &error );
- if ( error )
- result = 0;
-
- (void)FT_Stream_Seek( stream, old_pos );
- }
-
- return result;
- }
-
-
- FT_EXPORT_DEF( FT_Error )
- FT_Stream_OpenGzip( FT_Stream stream,
- FT_Stream source )
- {
- FT_Error error;
- FT_Memory memory = source->memory;
- FT_GZipFile zip;
-
-
- /*
- * check the header right now; this prevents allocating un-necessary
- * objects when we don't need them
- */
- error = ft_gzip_check_header( source );
- if ( error )
- goto Exit;
-
- FT_ZERO( stream );
- stream->memory = memory;
-
- if ( !FT_QNEW( zip ) )
- {
- error = ft_gzip_file_init( zip, stream, source );
- if ( error )
- {
- FT_FREE( zip );
- goto Exit;
- }
-
- stream->descriptor.pointer = zip;
- }
-
- /*
- * We use the following trick to try to dramatically improve the
- * performance while dealing with small files. If the original stream
- * size is less than a certain threshold, we try to load the whole font
- * file into memory. This saves us from using the 32KB buffer needed
- * to inflate the file, plus the two 4KB intermediate input/output
- * buffers used in the `FT_GZipFile' structure.
- */
- {
- FT_ULong zip_size = ft_gzip_get_uncompressed_size( source );
-
-
- if ( zip_size != 0 && zip_size < 40 * 1024 )
- {
- FT_Byte* zip_buff;
-
-
- if ( !FT_ALLOC( zip_buff, zip_size ) )
- {
- FT_ULong count;
-
-
- count = ft_gzip_file_io( zip, 0, zip_buff, zip_size );
- if ( count == zip_size )
- {
- ft_gzip_file_done( zip );
- FT_FREE( zip );
-
- stream->descriptor.pointer = NULL;
-
- stream->size = zip_size;
- stream->pos = 0;
- stream->base = zip_buff;
- stream->read = NULL;
- stream->close = ft_gzip_stream_close;
-
- goto Exit;
- }
-
- ft_gzip_file_io( zip, 0, NULL, 0 );
- FT_FREE( zip_buff );
- }
- error = Gzip_Err_Ok;
- }
- }
-
- stream->size = 0x7FFFFFFFL; /* don't know the real size! */
- stream->pos = 0;
- stream->base = 0;
- stream->read = ft_gzip_stream_io;
- stream->close = ft_gzip_stream_close;
-
- Exit:
- return error;
- }
-
-#else /* !FT_CONFIG_OPTION_USE_ZLIB */
-
- FT_EXPORT_DEF( FT_Error )
- FT_Stream_OpenGzip( FT_Stream stream,
- FT_Stream source )
- {
- FT_UNUSED( stream );
- FT_UNUSED( source );
-
- return Gzip_Err_Unimplemented_Feature;
- }
-
-#endif /* !FT_CONFIG_OPTION_USE_ZLIB */
-
-
-/* END */