+++ /dev/null
-/***************************************************************************/
-/* */
-/* t1parse.c */
-/* */
-/* Type 1 parser (body). */
-/* */
-/* Copyright 1996-2001 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_CALC_H
-#include FT_INTERNAL_STREAM_H
-#include FT_INTERNAL_POSTSCRIPT_AUX_H
-
-#include "t1parse.h"
-
-#include "t1errors.h"
-
-#include <string.h> /* for strncmp() */
-
-
- /*************************************************************************/
- /* */
- /* 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 *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
-#define IS_T1_WHITESPACE( c ) ( (c) == ' ' || (c) == '\t' )
-#define IS_T1_LINESPACE( c ) ( (c) == '\r' || (c) == '\n' )
-
-#define IS_T1_SPACE( c ) ( IS_T1_WHITESPACE( c ) || IS_T1_LINESPACE( c ) )
-
-
- typedef struct PFB_Tag_
- {
- FT_UShort tag;
- FT_Long size;
-
- } PFB_Tag;
-
-
-#undef FT_STRUCTURE
-#define FT_STRUCTURE PFB_Tag
-
-
- static
- const FT_Frame_Field pfb_tag_fields[] =
- {
- FT_FRAME_START( 6 ),
- FT_FRAME_USHORT ( tag ),
- FT_FRAME_LONG_LE( size ),
- FT_FRAME_END
- };
-
-
- static FT_Error
- read_pfb_tag( FT_Stream stream,
- FT_UShort* tag,
- FT_Long* size )
- {
- FT_Error error;
- PFB_Tag head;
-
-
- *tag = 0;
- *size = 0;
- if ( !READ_Fields( pfb_tag_fields, &head ) )
- {
- if ( head.tag == 0x8001 || head.tag == 0x8002 )
- {
- *tag = head.tag;
- *size = head.size;
- }
- }
- return error;
- }
-
-
- FT_LOCAL_DEF FT_Error
- T1_New_Parser( T1_ParserRec* parser,
- FT_Stream stream,
- FT_Memory memory,
- PSAux_Interface* psaux )
- {
- FT_Error error;
- FT_UShort tag;
- FT_Long size;
-
-
- psaux->t1_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;
-
- /******************************************************************/
- /* */
- /* 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 ( FILE_Seek( 0L ) )
- goto Exit;
-
- error = read_pfb_tag( stream, &tag, &size );
- if ( error )
- goto Exit;
-
- if ( tag != 0x8001 )
- {
- /* assume that this is a PFA file for now; an error will */
- /* be produced later when more things are checked */
- if ( FILE_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 ( FILE_Skip( size ) )
- goto Exit;
- }
- else
- {
- /* read segment in memory */
- if ( ALLOC( parser->base_dict, size ) ||
- FILE_Read( parser->base_dict, size ) )
- goto Exit;
- parser->base_len = size;
- }
-
- /* Now check font format; we must see `%!PS-AdobeFont-1' */
- /* or `%!FontType' */
- {
- if ( size <= 16 ||
- ( strncmp( (const char*)parser->base_dict,
- "%!PS-AdobeFont-1", 16 ) &&
- strncmp( (const char*)parser->base_dict,
- "%!FontType", 10 ) ) )
- {
- FT_TRACE2(( "[not a Type1 font]\n" ));
- error = T1_Err_Unknown_File_Format;
- }
- else
- {
- 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 )
- FREE( parser->base_dict );
-
- return error;
- }
-
-
- FT_LOCAL_DEF void
- T1_Finalize_Parser( T1_ParserRec* parser )
- {
- FT_Memory memory = parser->root.memory;
-
-
- /* always free the private dictionary */
- FREE( parser->private_dict );
-
- /* free the base dictionary only when we have a disk stream */
- if ( !parser->in_memory )
- FREE( parser->base_dict );
-
- parser->root.funcs.done( &parser->root );
- }
-
-
- /* return the value of an hexadecimal digit */
- static int
- hexa_value( char c )
- {
- unsigned int d;
-
-
- d = (unsigned int)( c - '0' );
- if ( d <= 9 )
- return (int)d;
-
- d = (unsigned int)( c - 'a' );
- if ( d <= 5 )
- return (int)( d + 10 );
-
- d = (unsigned int)( c - 'A' );
- if ( d <= 5 )
- return (int)( d + 10 );
-
- return -1;
- }
-
-
- FT_LOCAL_DEF FT_Error
- T1_Get_Private_Dict( T1_ParserRec* parser,
- PSAux_Interface* psaux )
- {
- FT_Stream stream = parser->stream;
- FT_Memory memory = parser->root.memory;
- FT_Error error = 0;
- FT_Long 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 = FILE_Pos();
- FT_UShort tag;
-
-
- parser->private_len = 0;
- for (;;)
- {
- error = read_pfb_tag( stream, &tag, &size );
- if ( error )
- goto Fail;
-
- if ( tag != 0x8002 )
- break;
-
- parser->private_len += size;
-
- if ( FILE_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:" ));
- FT_ERROR(( " invalid private dictionary section\n" ));
- error = T1_Err_Invalid_File_Format;
- goto Fail;
- }
-
- if ( FILE_Seek( start_pos ) ||
- ALLOC( parser->private_dict, parser->private_len ) )
- goto Fail;
-
- parser->private_len = 0;
- for (;;)
- {
- error = read_pfb_tag( stream, &tag, &size );
- if ( error || tag != 0x8002 )
- {
- error = T1_Err_Ok;
- break;
- }
-
- if ( FILE_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;
-
-
- 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' )
- {
- cur += 6; /* we skip the newling after the `eexec' */
-
- /* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
- /* skip the extra \n if we find it */
- if ( cur[0] == '\n' )
- cur++;
-
- break;
- }
- }
- cur++;
- if ( cur >= limit )
- {
- FT_ERROR(( "T1_Get_Private_Dict:" ));
- FT_ERROR(( " could not find `eexec' keyword\n" ));
- error = T1_Err_Invalid_File_Format;
- goto Exit;
- }
- }
-
- /* 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 */
-
- size = (FT_Long)( parser->base_len - ( cur - parser->base_dict ) );
-
- if ( parser->in_memory )
- {
- /* note that we allocate one more byte to put a terminating `0' */
- if ( 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 ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
- hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )
-
- /* binary encoding -- `simply' copy the private dict */
- MEM_Copy( parser->private_dict, cur, size );
-
- else
- {
- /* ASCII hexadecimal encoding */
-
- FT_Byte* write;
- FT_Int count;
-
-
- write = parser->private_dict;
- count = 0;
-
- for ( ;cur < limit; cur++ )
- {
- int hex1;
-
-
- /* check for newline */
- if ( cur[0] == '\r' || cur[0] == '\n' )
- continue;
-
- /* exit if we have a non-hexadecimal digit that isn't a newline */
- hex1 = hexa_value( cur[0] );
- if ( hex1 < 0 || cur + 1 >= limit )
- break;
-
- /* otherwise, store byte */
- *write++ = (FT_Byte)( ( hex1 << 4 ) | hexa_value( cur[1] ) );
- count++;
- cur++;
- }
-
- /* put a safeguard */
- parser->private_len = (FT_Int)( write - parser->private_dict );
- *write++ = 0;
- }
- }
-
- /* we now decrypt the encoded binary private dictionary */
- psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );
- 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 */
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