156 lines
5.3 KiB
C
156 lines
5.3 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 1996-2001, 2002 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 <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_CALC_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_STREAM_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 trace_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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FT_LOCAL_DEF( FT_Error )
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CID_New_Parser( 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 buffer[256 + 10];
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FT_Int buff_len;
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FT_MEM_SET( parser, 0, sizeof ( *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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goto Exit;
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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 valid CID-keyed font]\n" ));
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error = CID_Err_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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/* now, read the rest of the file, until we find a `StartData' */
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buff_len = 256;
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for (;;)
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{
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FT_Byte *p, *limit = buffer + 256;
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FT_ULong top_position;
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/* fill input buffer */
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buff_len -= 256;
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if ( buff_len > 0 )
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FT_MEM_MOVE( buffer, limit, buff_len );
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p = buffer + buff_len;
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if ( FT_STREAM_READ( p, 256 + 10 - buff_len ) )
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goto Exit;
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top_position = FT_STREAM_POS() - buff_len;
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buff_len = 256 + 10;
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/* look for `StartData' */
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for ( p = buffer; p < limit; p++ )
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{
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if ( p[0] == 'S' && ft_strncmp( (char*)p, "StartData", 9 ) == 0 )
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{
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/* save offset of binary data after `StartData' */
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offset = (FT_ULong)( top_position - ( limit - p ) + 10 );
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goto Found;
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}
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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. We will now */
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/* rewind and extract the frame of corresponding to the 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 = -1;
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Exit:
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return error;
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}
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FT_LOCAL_DEF( void )
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CID_Done_Parser( 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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