forked from minhngoc25a/freetype2
461 lines
15 KiB
C
461 lines
15 KiB
C
/***************************************************************************/
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/* */
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/* t1parse.c */
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/* */
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/* Type 1 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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/*************************************************************************/
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/* */
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/* The Type 1 parser is in charge of the following: */
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/* */
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/* - provide an implementation of a growing sequence of objects called */
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/* a `T1_Table' (used to build various tables needed by the loader). */
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/* */
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/* - opening .pfb and .pfa files to extract their top-level and private */
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/* dictionaries. */
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/* */
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/* - read numbers, arrays & strings from any dictionary. */
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/* */
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/* See `t1load.c' to see how data is loaded from the font file. */
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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_STREAM_H
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#include FT_INTERNAL_POSTSCRIPT_AUX_H
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#include "t1parse.h"
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#include "t1errors.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_t1parse
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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 IS_T1_WHITESPACE( c ) ( (c) == ' ' || (c) == '\t' )
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#define IS_T1_LINESPACE( c ) ( (c) == '\r' || (c) == '\n' )
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#define IS_T1_SPACE( c ) ( IS_T1_WHITESPACE( c ) || IS_T1_LINESPACE( c ) )
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typedef struct PFB_Tag_
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{
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FT_UShort tag;
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FT_Long size;
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} PFB_Tag;
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#undef FT_STRUCTURE
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#define FT_STRUCTURE PFB_Tag
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static
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const FT_Frame_Field pfb_tag_fields[] =
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{
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FT_FRAME_START( 6 ),
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FT_FRAME_USHORT ( tag ),
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FT_FRAME_LONG_LE( size ),
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FT_FRAME_END
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};
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static FT_Error
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read_pfb_tag( FT_Stream stream,
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FT_UShort* tag,
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FT_Long* size )
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{
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FT_Error error;
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PFB_Tag head;
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*tag = 0;
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*size = 0;
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if ( !FT_STREAM_READ_FIELDS( pfb_tag_fields, &head ) )
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{
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if ( head.tag == 0x8001U || head.tag == 0x8002U )
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{
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*tag = head.tag;
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*size = head.size;
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}
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}
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return error;
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}
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FT_LOCAL_DEF( FT_Error )
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T1_New_Parser( T1_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_UShort tag;
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FT_Long size;
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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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parser->base_len = 0;
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parser->base_dict = 0;
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parser->private_len = 0;
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parser->private_dict = 0;
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parser->in_pfb = 0;
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parser->in_memory = 0;
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parser->single_block = 0;
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/******************************************************************/
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/* */
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/* Here a short summary of what is going on: */
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/* */
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/* When creating a new Type 1 parser, we try to locate and load */
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/* the base dictionary if this is possible (i.e. for PFB */
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/* files). Otherwise, we load the whole font into memory. */
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/* */
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/* When `loading' the base dictionary, we only setup pointers */
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/* in the case of a memory-based stream. Otherwise, we */
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/* allocate and load the base dictionary in it. */
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/* */
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/* parser->in_pfb is set if we are in a binary (".pfb") font. */
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/* parser->in_memory is set if we have a memory stream. */
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/* */
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/* try to compute the size of the base dictionary; */
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/* look for a Postscript binary file tag, i.e 0x8001 */
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if ( FT_STREAM_SEEK( 0L ) )
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goto Exit;
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error = read_pfb_tag( stream, &tag, &size );
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if ( error )
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goto Exit;
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if ( tag != 0x8001U )
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{
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/* assume that this is a PFA file for now; an error will */
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/* be produced later when more things are checked */
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if ( FT_STREAM_SEEK( 0L ) )
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goto Exit;
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size = stream->size;
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}
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else
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parser->in_pfb = 1;
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/* now, try to load `size' bytes of the `base' dictionary we */
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/* found previously */
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/* if it is a memory-based resource, set up pointers */
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if ( !stream->read )
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{
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parser->base_dict = (FT_Byte*)stream->base + stream->pos;
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parser->base_len = size;
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parser->in_memory = 1;
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/* check that the `size' field is valid */
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if ( FT_STREAM_SKIP( size ) )
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goto Exit;
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}
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else
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{
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/* read segment in memory */
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if ( FT_ALLOC( parser->base_dict, size ) ||
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FT_STREAM_READ( parser->base_dict, size ) )
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goto Exit;
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parser->base_len = size;
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}
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/* Now check font format; we must see `%!PS-AdobeFont-1' */
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/* or `%!FontType' */
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{
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if ( size <= 16 ||
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( ft_strncmp( (const char*)parser->base_dict,
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"%!PS-AdobeFont-1", 16 ) &&
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ft_strncmp( (const char*)parser->base_dict,
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"%!FontType", 10 ) ) )
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{
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FT_TRACE2(( "[not a Type1 font]\n" ));
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error = T1_Err_Unknown_File_Format;
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}
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else
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{
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parser->root.base = parser->base_dict;
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parser->root.cursor = parser->base_dict;
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parser->root.limit = parser->root.cursor + parser->base_len;
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}
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}
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Exit:
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if ( error && !parser->in_memory )
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FT_FREE( parser->base_dict );
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return error;
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}
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FT_LOCAL_DEF( void )
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T1_Finalize_Parser( T1_Parser parser )
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{
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FT_Memory memory = parser->root.memory;
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/* always free the private dictionary */
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FT_FREE( parser->private_dict );
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/* free the base dictionary only when we have a disk stream */
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if ( !parser->in_memory )
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FT_FREE( parser->base_dict );
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parser->root.funcs.done( &parser->root );
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}
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/* return the value of an hexadecimal digit */
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static int
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hexa_value( char c )
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{
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unsigned int d;
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d = (unsigned int)( c - '0' );
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if ( d <= 9 )
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return (int)d;
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d = (unsigned int)( c - 'a' );
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if ( d <= 5 )
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return (int)( d + 10 );
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d = (unsigned int)( c - 'A' );
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if ( d <= 5 )
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return (int)( d + 10 );
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return -1;
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}
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FT_LOCAL_DEF( FT_Error )
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T1_Get_Private_Dict( T1_Parser parser,
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PSAux_Service psaux )
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{
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FT_Stream stream = parser->stream;
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FT_Memory memory = parser->root.memory;
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FT_Error error = 0;
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FT_Long size;
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if ( parser->in_pfb )
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{
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/* in the case of the PFB format, the private dictionary can be */
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/* made of several segments. We thus first read the number of */
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/* segments to compute the total size of the private dictionary */
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/* then re-read them into memory. */
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FT_Long start_pos = FT_STREAM_POS();
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FT_UShort tag;
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parser->private_len = 0;
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for (;;)
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{
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error = read_pfb_tag( stream, &tag, &size );
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if ( error )
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goto Fail;
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if ( tag != 0x8002U )
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break;
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parser->private_len += size;
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if ( FT_STREAM_SKIP( size ) )
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goto Fail;
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}
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/* Check that we have a private dictionary there */
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/* and allocate private dictionary buffer */
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if ( parser->private_len == 0 )
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{
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FT_ERROR(( "T1_Get_Private_Dict:" ));
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FT_ERROR(( " invalid private dictionary section\n" ));
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error = T1_Err_Invalid_File_Format;
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goto Fail;
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}
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if ( FT_STREAM_SEEK( start_pos ) ||
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FT_ALLOC( parser->private_dict, parser->private_len ) )
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goto Fail;
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parser->private_len = 0;
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for (;;)
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{
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error = read_pfb_tag( stream, &tag, &size );
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if ( error || tag != 0x8002U )
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{
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error = T1_Err_Ok;
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break;
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}
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if ( FT_STREAM_READ( parser->private_dict + parser->private_len, size ) )
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goto Fail;
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parser->private_len += size;
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}
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}
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else
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{
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/* we have already `loaded' the whole PFA font file into memory; */
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/* if this is a memory resource, allocate a new block to hold */
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/* the private dict. Otherwise, simply overwrite into the base */
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/* dictionary block in the heap. */
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/* first of all, look at the `eexec' keyword */
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FT_Byte* cur = parser->base_dict;
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FT_Byte* limit = cur + parser->base_len;
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FT_Byte c;
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for (;;)
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{
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c = cur[0];
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if ( c == 'e' && cur + 9 < limit ) /* 9 = 5 letters for `eexec' + */
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/* newline + 4 chars */
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{
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if ( cur[1] == 'e' && cur[2] == 'x' &&
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cur[3] == 'e' && cur[4] == 'c' )
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{
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cur += 6; /* we skip the newling after the `eexec' */
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/* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
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/* skip the extra \n if we find it */
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if ( cur[0] == '\n' )
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cur++;
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break;
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}
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}
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cur++;
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if ( cur >= limit )
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{
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FT_ERROR(( "T1_Get_Private_Dict:" ));
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FT_ERROR(( " could not find `eexec' keyword\n" ));
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error = T1_Err_Invalid_File_Format;
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goto Exit;
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}
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}
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/* now determine where to write the _encrypted_ binary private */
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/* dictionary. We overwrite the base dictionary for disk-based */
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/* resources and allocate a new block otherwise */
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size = (FT_Long)( parser->base_len - ( cur - parser->base_dict ) );
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if ( parser->in_memory )
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{
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/* note that we allocate one more byte to put a terminating `0' */
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if ( FT_ALLOC( parser->private_dict, size + 1 ) )
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goto Fail;
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parser->private_len = size;
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}
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else
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{
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parser->single_block = 1;
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parser->private_dict = parser->base_dict;
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parser->private_len = size;
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parser->base_dict = 0;
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parser->base_len = 0;
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}
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/* now determine whether the private dictionary is encoded in binary */
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/* or hexadecimal ASCII format -- decode it accordingly */
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/* we need to access the next 4 bytes (after the final \r following */
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/* the `eexec' keyword); if they all are hexadecimal digits, then */
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/* we have a case of ASCII storage */
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if ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
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hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )
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/* binary encoding -- `simply' copy the private dict */
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FT_MEM_COPY( parser->private_dict, cur, size );
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else
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{
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/* ASCII hexadecimal encoding */
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FT_Byte* write;
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FT_Int count;
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write = parser->private_dict;
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count = 0;
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for ( ;cur < limit; cur++ )
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{
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int hex1;
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/* check for newline */
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if ( cur[0] == '\r' || cur[0] == '\n' )
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continue;
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/* exit if we have a non-hexadecimal digit that isn't a newline */
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hex1 = hexa_value( cur[0] );
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if ( hex1 < 0 || cur + 1 >= limit )
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break;
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/* otherwise, store byte */
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*write++ = (FT_Byte)( ( hex1 << 4 ) | hexa_value( cur[1] ) );
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count++;
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cur++;
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}
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/* put a safeguard */
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parser->private_len = (FT_Int)( write - parser->private_dict );
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*write++ = 0;
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}
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}
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/* we now decrypt the encoded binary private dictionary */
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psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );
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parser->root.base = parser->private_dict;
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parser->root.cursor = parser->private_dict;
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parser->root.limit = parser->root.cursor + parser->private_len;
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Fail:
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Exit:
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return error;
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}
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/* END */
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