--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/type1/t1parse.c Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,486 @@
+/***************************************************************************/
+/* */
+/* t1parse.c */
+/* */
+/* Type 1 parser (body). */
+/* */
+/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2008, 2009 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. */
+/* */
+/***************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* The Type 1 parser is in charge of the following: */
+ /* */
+ /* - provide an implementation of a growing sequence of objects called */
+ /* a `T1_Table' (used to build various tables needed by the loader). */
+ /* */
+ /* - opening .pfb and .pfa files to extract their top-level and private */
+ /* dictionaries. */
+ /* */
+ /* - read numbers, arrays & strings from any dictionary. */
+ /* */
+ /* See `t1load.c' to see how data is loaded from the font file. */
+ /* */
+ /*************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_POSTSCRIPT_AUX_H
+
+#include "t1parse.h"
+
+#include "t1errors.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_t1parse
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** INPUT STREAM PARSER *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /* see Adobe Technical Note 5040.Download_Fonts.pdf */
+
+ static FT_Error
+ read_pfb_tag( FT_Stream stream,
+ FT_UShort *atag,
+ FT_ULong *asize )
+ {
+ FT_Error error;
+ FT_UShort tag;
+ FT_ULong size;
+
+
+ *atag = 0;
+ *asize = 0;
+
+ if ( !FT_READ_USHORT( tag ) )
+ {
+ if ( tag == 0x8001U || tag == 0x8002U )
+ {
+ if ( !FT_READ_ULONG_LE( size ) )
+ *asize = size;
+ }
+
+ *atag = tag;
+ }
+
+ return error;
+ }
+
+
+ static FT_Error
+ check_type1_format( FT_Stream stream,
+ const char* header_string,
+ size_t header_length )
+ {
+ FT_Error error;
+ FT_UShort tag;
+ FT_ULong dummy;
+
+
+ if ( FT_STREAM_SEEK( 0 ) )
+ goto Exit;
+
+ error = read_pfb_tag( stream, &tag, &dummy );
+ if ( error )
+ goto Exit;
+
+ /* We assume that the first segment in a PFB is always encoded as */
+ /* text. This might be wrong (and the specification doesn't insist */
+ /* on that), but we have never seen a counterexample. */
+ if ( tag != 0x8001U && FT_STREAM_SEEK( 0 ) )
+ goto Exit;
+
+ if ( !FT_FRAME_ENTER( header_length ) )
+ {
+ error = T1_Err_Ok;
+
+ if ( ft_memcmp( stream->cursor, header_string, header_length ) != 0 )
+ error = T1_Err_Unknown_File_Format;
+
+ FT_FRAME_EXIT();
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ T1_New_Parser( T1_Parser parser,
+ FT_Stream stream,
+ FT_Memory memory,
+ PSAux_Service psaux )
+ {
+ FT_Error error;
+ FT_UShort tag;
+ FT_ULong size;
+
+
+ psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory );
+
+ parser->stream = stream;
+ parser->base_len = 0;
+ parser->base_dict = 0;
+ parser->private_len = 0;
+ parser->private_dict = 0;
+ parser->in_pfb = 0;
+ parser->in_memory = 0;
+ parser->single_block = 0;
+
+ /* check the header format */
+ error = check_type1_format( stream, "%!PS-AdobeFont", 14 );
+ if ( error )
+ {
+ if ( error != T1_Err_Unknown_File_Format )
+ goto Exit;
+
+ error = check_type1_format( stream, "%!FontType", 10 );
+ if ( error )
+ {
+ FT_TRACE2(( "[not a Type1 font]\n" ));
+ goto Exit;
+ }
+ }
+
+ /******************************************************************/
+ /* */
+ /* Here a short summary of what is going on: */
+ /* */
+ /* When creating a new Type 1 parser, we try to locate and load */
+ /* the base dictionary if this is possible (i.e., for PFB */
+ /* files). Otherwise, we load the whole font into memory. */
+ /* */
+ /* When `loading' the base dictionary, we only setup pointers */
+ /* in the case of a memory-based stream. Otherwise, we */
+ /* allocate and load the base dictionary in it. */
+ /* */
+ /* parser->in_pfb is set if we are in a binary (`.pfb') font. */
+ /* parser->in_memory is set if we have a memory stream. */
+ /* */
+
+ /* try to compute the size of the base dictionary; */
+ /* look for a Postscript binary file tag, i.e., 0x8001 */
+ if ( FT_STREAM_SEEK( 0L ) )
+ goto Exit;
+
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error )
+ goto Exit;
+
+ if ( tag != 0x8001U )
+ {
+ /* assume that this is a PFA file for now; an error will */
+ /* be produced later when more things are checked */
+ if ( FT_STREAM_SEEK( 0L ) )
+ goto Exit;
+ size = stream->size;
+ }
+ else
+ parser->in_pfb = 1;
+
+ /* now, try to load `size' bytes of the `base' dictionary we */
+ /* found previously */
+
+ /* if it is a memory-based resource, set up pointers */
+ if ( !stream->read )
+ {
+ parser->base_dict = (FT_Byte*)stream->base + stream->pos;
+ parser->base_len = size;
+ parser->in_memory = 1;
+
+ /* check that the `size' field is valid */
+ if ( FT_STREAM_SKIP( size ) )
+ goto Exit;
+ }
+ else
+ {
+ /* read segment in memory -- this is clumsy, but so does the format */
+ if ( FT_ALLOC( parser->base_dict, size ) ||
+ FT_STREAM_READ( parser->base_dict, size ) )
+ goto Exit;
+ parser->base_len = size;
+ }
+
+ parser->root.base = parser->base_dict;
+ parser->root.cursor = parser->base_dict;
+ parser->root.limit = parser->root.cursor + parser->base_len;
+
+ Exit:
+ if ( error && !parser->in_memory )
+ FT_FREE( parser->base_dict );
+
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ T1_Finalize_Parser( T1_Parser parser )
+ {
+ FT_Memory memory = parser->root.memory;
+
+
+ /* always free the private dictionary */
+ FT_FREE( parser->private_dict );
+
+ /* free the base dictionary only when we have a disk stream */
+ if ( !parser->in_memory )
+ FT_FREE( parser->base_dict );
+
+ parser->root.funcs.done( &parser->root );
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ T1_Get_Private_Dict( T1_Parser parser,
+ PSAux_Service psaux )
+ {
+ FT_Stream stream = parser->stream;
+ FT_Memory memory = parser->root.memory;
+ FT_Error error = T1_Err_Ok;
+ FT_ULong size;
+
+
+ if ( parser->in_pfb )
+ {
+ /* in the case of the PFB format, the private dictionary can be */
+ /* made of several segments. We thus first read the number of */
+ /* segments to compute the total size of the private dictionary */
+ /* then re-read them into memory. */
+ FT_Long start_pos = FT_STREAM_POS();
+ FT_UShort tag;
+
+
+ parser->private_len = 0;
+ for (;;)
+ {
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error )
+ goto Fail;
+
+ if ( tag != 0x8002U )
+ break;
+
+ parser->private_len += size;
+
+ if ( FT_STREAM_SKIP( size ) )
+ goto Fail;
+ }
+
+ /* Check that we have a private dictionary there */
+ /* and allocate private dictionary buffer */
+ if ( parser->private_len == 0 )
+ {
+ FT_ERROR(( "T1_Get_Private_Dict:"
+ " invalid private dictionary section\n" ));
+ error = T1_Err_Invalid_File_Format;
+ goto Fail;
+ }
+
+ if ( FT_STREAM_SEEK( start_pos ) ||
+ FT_ALLOC( parser->private_dict, parser->private_len ) )
+ goto Fail;
+
+ parser->private_len = 0;
+ for (;;)
+ {
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error || tag != 0x8002U )
+ {
+ error = T1_Err_Ok;
+ break;
+ }
+
+ if ( FT_STREAM_READ( parser->private_dict + parser->private_len,
+ size ) )
+ goto Fail;
+
+ parser->private_len += size;
+ }
+ }
+ else
+ {
+ /* We have already `loaded' the whole PFA font file into memory; */
+ /* if this is a memory resource, allocate a new block to hold */
+ /* the private dict. Otherwise, simply overwrite into the base */
+ /* dictionary block in the heap. */
+
+ /* first of all, look at the `eexec' keyword */
+ FT_Byte* cur = parser->base_dict;
+ FT_Byte* limit = cur + parser->base_len;
+ FT_Byte c;
+
+
+ Again:
+ for (;;)
+ {
+ c = cur[0];
+ if ( c == 'e' && cur + 9 < limit ) /* 9 = 5 letters for `eexec' + */
+ /* newline + 4 chars */
+ {
+ if ( cur[1] == 'e' &&
+ cur[2] == 'x' &&
+ cur[3] == 'e' &&
+ cur[4] == 'c' )
+ break;
+ }
+ cur++;
+ if ( cur >= limit )
+ {
+ FT_ERROR(( "T1_Get_Private_Dict:"
+ " could not find `eexec' keyword\n" ));
+ error = T1_Err_Invalid_File_Format;
+ goto Exit;
+ }
+ }
+
+ /* check whether `eexec' was real -- it could be in a comment */
+ /* or string (as e.g. in u003043t.gsf from ghostscript) */
+
+ parser->root.cursor = parser->base_dict;
+ parser->root.limit = cur + 9;
+
+ cur = parser->root.cursor;
+ limit = parser->root.limit;
+
+ while ( cur < limit )
+ {
+ if ( *cur == 'e' && ft_strncmp( (char*)cur, "eexec", 5 ) == 0 )
+ goto Found;
+
+ T1_Skip_PS_Token( parser );
+ if ( parser->root.error )
+ break;
+ T1_Skip_Spaces ( parser );
+ cur = parser->root.cursor;
+ }
+
+ /* we haven't found the correct `eexec'; go back and continue */
+ /* searching */
+
+ cur = limit;
+ limit = parser->base_dict + parser->base_len;
+ goto Again;
+
+ /* now determine where to write the _encrypted_ binary private */
+ /* dictionary. We overwrite the base dictionary for disk-based */
+ /* resources and allocate a new block otherwise */
+
+ Found:
+ parser->root.limit = parser->base_dict + parser->base_len;
+
+ T1_Skip_PS_Token( parser );
+ cur = parser->root.cursor;
+
+ /* according to the Type1 spec, the first cipher byte must not be */
+ /* an ASCII whitespace character code (blank, tab, carriage return */
+ /* or line feed). We have seen Type 1 fonts with two line feed */
+ /* characters... So skip now all whitespace character codes. */
+ while ( cur < limit &&
+ ( *cur == ' ' ||
+ *cur == '\t' ||
+ *cur == '\r' ||
+ *cur == '\n' ) )
+ ++cur;
+ if ( cur >= limit )
+ {
+ FT_ERROR(( "T1_Get_Private_Dict:"
+ " `eexec' not properly terminated\n" ));
+ error = T1_Err_Invalid_File_Format;
+ goto Exit;
+ }
+
+ size = parser->base_len - ( cur - parser->base_dict );
+
+ if ( parser->in_memory )
+ {
+ /* note that we allocate one more byte to put a terminating `0' */
+ if ( FT_ALLOC( parser->private_dict, size + 1 ) )
+ goto Fail;
+ parser->private_len = size;
+ }
+ else
+ {
+ parser->single_block = 1;
+ parser->private_dict = parser->base_dict;
+ parser->private_len = size;
+ parser->base_dict = 0;
+ parser->base_len = 0;
+ }
+
+ /* now determine whether the private dictionary is encoded in binary */
+ /* or hexadecimal ASCII format -- decode it accordingly */
+
+ /* we need to access the next 4 bytes (after the final \r following */
+ /* the `eexec' keyword); if they all are hexadecimal digits, then */
+ /* we have a case of ASCII storage */
+
+ if ( ft_isxdigit( cur[0] ) && ft_isxdigit( cur[1] ) &&
+ ft_isxdigit( cur[2] ) && ft_isxdigit( cur[3] ) )
+ {
+ /* ASCII hexadecimal encoding */
+ FT_Long len;
+
+
+ parser->root.cursor = cur;
+ (void)psaux->ps_parser_funcs->to_bytes( &parser->root,
+ parser->private_dict,
+ parser->private_len,
+ &len,
+ 0 );
+ parser->private_len = len;
+
+ /* put a safeguard */
+ parser->private_dict[len] = '\0';
+ }
+ else
+ /* binary encoding -- copy the private dict */
+ FT_MEM_MOVE( parser->private_dict, cur, size );
+ }
+
+ /* we now decrypt the encoded binary private dictionary */
+ psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );
+
+ /* replace the four random bytes at the beginning with whitespace */
+ parser->private_dict[0] = ' ';
+ parser->private_dict[1] = ' ';
+ parser->private_dict[2] = ' ';
+ parser->private_dict[3] = ' ';
+
+ parser->root.base = parser->private_dict;
+ parser->root.cursor = parser->private_dict;
+ parser->root.limit = parser->root.cursor + parser->private_len;
+
+ Fail:
+ Exit:
+ return error;
+ }
+
+
+/* END */