287 lines
8.6 KiB
C
287 lines
8.6 KiB
C
/****************************************************************************
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*
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* cidparse.c
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*
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* CID-keyed Type1 parser (body).
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*
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* Copyright (C) 1996-2023 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftstream.h>
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#include "cidparse.h"
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#include "ciderrs.h"
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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#undef FT_COMPONENT
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#define FT_COMPONENT cidparse
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** INPUT STREAM PARSER *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#define STARTDATA "StartData"
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#define STARTDATA_LEN ( sizeof ( STARTDATA ) - 1 )
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#define SFNTS "/sfnts"
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#define SFNTS_LEN ( sizeof ( SFNTS ) - 1 )
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FT_LOCAL_DEF( FT_Error )
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cid_parser_new( CID_Parser* parser,
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FT_Stream stream,
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FT_Memory memory,
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PSAux_Service psaux )
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{
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FT_Error error;
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FT_ULong base_offset, offset, ps_len;
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FT_Byte *cur, *limit;
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FT_Byte *arg1, *arg2;
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FT_ZERO( parser );
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psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory );
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parser->stream = stream;
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base_offset = FT_STREAM_POS();
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/* first of all, check the font format in the header */
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if ( FT_FRAME_ENTER( 31 ) )
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{
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FT_TRACE2(( " not a CID-keyed font\n" ));
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error = FT_THROW( Unknown_File_Format );
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goto Exit;
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}
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if ( ft_strncmp( (char *)stream->cursor,
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"%!PS-Adobe-3.0 Resource-CIDFont", 31 ) )
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{
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FT_TRACE2(( " not a CID-keyed font\n" ));
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error = FT_THROW( Unknown_File_Format );
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}
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FT_FRAME_EXIT();
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if ( error )
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goto Exit;
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Again:
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/* now, read the rest of the file until we find */
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/* `StartData' or `/sfnts' */
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{
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/*
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* The algorithm is as follows (omitting the case with less than 256
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* bytes to fill for simplicity).
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*
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* 1. Fill the buffer with 256 + STARTDATA_LEN bytes.
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*
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* 2. Search for the STARTDATA and SFNTS strings at positions
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* buffer[0], buffer[1], ...,
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* buffer[255 + STARTDATA_LEN - SFNTS_LEN].
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*
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* 3. Move the last STARTDATA_LEN bytes to buffer[0].
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*
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* 4. Fill the buffer with 256 bytes, starting at STARTDATA_LEN.
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*
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* 5. Repeat with step 2.
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*
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*/
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FT_Byte buffer[256 + STARTDATA_LEN + 1];
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/* values for the first loop */
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FT_ULong read_len = 256 + STARTDATA_LEN;
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FT_ULong read_offset = 0;
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FT_Byte* p = buffer;
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for ( offset = FT_STREAM_POS(); ; offset += 256 )
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{
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FT_ULong stream_len;
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stream_len = stream->size - FT_STREAM_POS();
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read_len = FT_MIN( read_len, stream_len );
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if ( FT_STREAM_READ( p, read_len ) )
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goto Exit;
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/* ensure that we do not compare with data beyond the buffer */
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p[read_len] = '\0';
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limit = p + read_len - SFNTS_LEN;
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for ( p = buffer; p < limit; p++ )
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{
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if ( p[0] == 'S' &&
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ft_strncmp( (char*)p, STARTDATA, STARTDATA_LEN ) == 0 )
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{
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/* save offset of binary data after `StartData' */
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offset += (FT_ULong)( p - buffer ) + STARTDATA_LEN + 1;
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goto Found;
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}
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else if ( p[1] == 's' &&
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ft_strncmp( (char*)p, SFNTS, SFNTS_LEN ) == 0 )
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{
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offset += (FT_ULong)( p - buffer ) + SFNTS_LEN + 1;
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goto Found;
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}
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}
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if ( read_offset + read_len < STARTDATA_LEN )
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{
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FT_TRACE2(( "cid_parser_new: no `StartData' keyword found\n" ));
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error = FT_THROW( Invalid_File_Format );
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goto Exit;
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}
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FT_MEM_MOVE( buffer,
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buffer + read_offset + read_len - STARTDATA_LEN,
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STARTDATA_LEN );
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/* values for the next loop */
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read_len = 256;
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read_offset = STARTDATA_LEN;
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p = buffer + read_offset;
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}
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}
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Found:
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/* We have found the start of the binary data or the `/sfnts' token. */
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/* Now rewind and extract the frame corresponding to this PostScript */
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/* section. */
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ps_len = offset - base_offset;
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if ( FT_STREAM_SEEK( base_offset ) ||
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FT_FRAME_EXTRACT( ps_len, parser->postscript ) )
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goto Exit;
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parser->data_offset = offset;
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parser->postscript_len = ps_len;
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parser->root.base = parser->postscript;
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parser->root.cursor = parser->postscript;
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parser->root.limit = parser->root.cursor + ps_len;
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parser->num_dict = FT_UINT_MAX;
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/* Finally, we check whether `StartData' or `/sfnts' was real -- */
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/* it could be in a comment or string. We also get the arguments */
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/* of `StartData' to find out whether the data is represented in */
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/* binary or hex format. */
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arg1 = parser->root.cursor;
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cid_parser_skip_PS_token( parser );
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cid_parser_skip_spaces ( parser );
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arg2 = parser->root.cursor;
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cid_parser_skip_PS_token( parser );
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cid_parser_skip_spaces ( parser );
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limit = parser->root.limit;
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cur = parser->root.cursor;
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while ( cur <= limit - SFNTS_LEN )
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{
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if ( parser->root.error )
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{
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error = parser->root.error;
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goto Exit;
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}
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if ( cur[0] == 'S' &&
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cur <= limit - STARTDATA_LEN &&
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ft_strncmp( (char*)cur, STARTDATA, STARTDATA_LEN ) == 0 )
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{
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T1_TokenRec type_token;
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FT_Long binary_length;
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parser->root.cursor = arg1;
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cid_parser_to_token( parser, &type_token );
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if ( type_token.limit - type_token.start == 5 &&
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ft_memcmp( (char*)type_token.start, "(Hex)", 5 ) == 0 )
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{
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parser->root.cursor = arg2;
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binary_length = cid_parser_to_int( parser );
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if ( binary_length < 0 )
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{
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FT_ERROR(( "cid_parser_new: invalid length of hex data\n" ));
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error = FT_THROW( Invalid_File_Format );
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}
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else
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parser->binary_length = (FT_ULong)binary_length;
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}
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goto Exit;
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}
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else if ( cur[1] == 's' &&
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ft_strncmp( (char*)cur, SFNTS, SFNTS_LEN ) == 0 )
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{
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FT_TRACE2(( "cid_parser_new: cannot handle Type 11 fonts\n" ));
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error = FT_THROW( Unknown_File_Format );
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goto Exit;
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}
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cid_parser_skip_PS_token( parser );
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cid_parser_skip_spaces ( parser );
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arg1 = arg2;
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arg2 = cur;
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cur = parser->root.cursor;
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}
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/* we haven't found the correct `StartData'; go back and continue */
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/* searching */
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FT_FRAME_RELEASE( parser->postscript );
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if ( !FT_STREAM_SEEK( offset ) )
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goto Again;
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Exit:
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return error;
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}
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#undef STARTDATA
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#undef STARTDATA_LEN
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#undef SFNTS
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#undef SFNTS_LEN
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FT_LOCAL_DEF( void )
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cid_parser_done( CID_Parser* parser )
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{
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/* always free the private dictionary */
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if ( parser->postscript )
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{
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FT_Stream stream = parser->stream;
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FT_FRAME_RELEASE( parser->postscript );
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}
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parser->root.funcs.done( &parser->root );
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}
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/* END */
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