+++ /dev/null
-/***************************************************************************/
-/* */
-/* t1parse.c */
-/* */
-/* Type 1 parser (body). */
-/* */
-/* Copyright 1996-2016 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 = FT_Err_Ok;
-
- if ( ft_memcmp( stream->cursor, header_string, header_length ) != 0 )
- error = FT_THROW( 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, NULL, NULL, memory );
-
- parser->stream = stream;
- parser->base_len = 0;
- parser->base_dict = NULL;
- parser->private_len = 0;
- parser->private_dict = NULL;
- 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 ( FT_ERR_NEQ( error, Unknown_File_Format ) )
- goto Exit;
-
- error = check_type1_format( stream, "%!FontType", 10 );
- if ( error )
- {
- FT_TRACE2(( " not a Type 1 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 = FT_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_ULong 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 = FT_THROW( 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 = FT_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_Pointer pos_lf;
- FT_Bool test_cr;
-
-
- Again:
- for (;;)
- {
- if ( cur[0] == 'e' &&
- cur + 9 < limit ) /* 9 = 5 letters for `eexec' + */
- /* whitespace + 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 = FT_THROW( 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;
- /* set limit to `eexec' + whitespace + 4 characters */
- parser->root.limit = cur + 10;
-
- cur = parser->root.cursor;
- limit = parser->root.limit;
-
- while ( cur < limit )
- {
- if ( cur[0] == 'e' &&
- cur + 5 < limit )
- {
- if ( cur[1] == 'e' &&
- cur[2] == 'x' &&
- cur[3] == 'e' &&
- cur[4] == 'c' )
- 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;
-
- if ( cur >= limit )
- {
- FT_ERROR(( "T1_Get_Private_Dict:"
- " premature end in private dictionary\n" ));
- error = FT_THROW( Invalid_File_Format );
- goto Exit;
- }
-
- 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;
- limit = parser->root.limit;
-
- /* According to the Type 1 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. */
- /* */
- /* On the other hand, Adobe's Type 1 parser handles fonts just */
- /* fine that are violating this limitation, so we add a heuristic */
- /* test to stop at \r only if it is not used for EOL. */
-
- pos_lf = ft_memchr( cur, '\n', (size_t)( limit - cur ) );
- test_cr = FT_BOOL( !pos_lf ||
- pos_lf > ft_memchr( cur,
- '\r',
- (size_t)( limit - cur ) ) );
-
- while ( cur < limit &&
- ( *cur == ' ' ||
- *cur == '\t' ||
- (test_cr && *cur == '\r' ) ||
- *cur == '\n' ) )
- ++cur;
- if ( cur >= limit )
- {
- FT_ERROR(( "T1_Get_Private_Dict:"
- " `eexec' not properly terminated\n" ));
- error = FT_THROW( Invalid_File_Format );
- goto Exit;
- }
-
- size = parser->base_len - (FT_ULong)( 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 = NULL;
- 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 whitespace */
- /* following the `eexec' keyword); if they all are hexadecimal */
- /* digits, then we have a case of ASCII storage */
-
- if ( cur + 3 < limit &&
- ft_isxdigit( cur[0] ) && ft_isxdigit( cur[1] ) &&
- ft_isxdigit( cur[2] ) && ft_isxdigit( cur[3] ) )
- {
- /* ASCII hexadecimal encoding */
- FT_ULong 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 );
-
- if ( parser->private_len < 4 )
- {
- FT_ERROR(( "T1_Get_Private_Dict:"
- " invalid private dictionary section\n" ));
- error = FT_THROW( Invalid_File_Format );
- goto Fail;
- }
-
- /* 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 */
projects / reactos.git / blobdiff