357 lines
9.3 KiB
C
357 lines
9.3 KiB
C
/****************************************************************************
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*
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* tfmobjs.c
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*
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* FreeType auxiliary TFM module.
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*
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* Copyright 1996-2018 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_FREETYPE_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_TFM_H
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#include "tfmobjs.h"
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#include "tfmmod.h"
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#include "tfmerr.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_tfmobjs
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/**************************************************************************
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*
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* Global TFM parameters.
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*
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*/
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#define tfm_size 30000 /* maximum length of tfm data, in bytes */
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#define lig_size 5000 /* maximum length of lig kern program, in words */
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#define hash_size 5003
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/**************************************************************************
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*
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* TFM font utility functions.
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*
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*/
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long tfm_read_intn(FT_Stream,int);
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unsigned long tfm_read_uintn(FT_Stream,int);
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#define READ_UINT1( stream ) (FT_ULong)tfm_read_uintn( stream, 1)
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#define READ_UINT2( stream ) (FT_ULong)tfm_read_uintn( stream, 2)
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#define READ_UINT4( stream ) (FT_ULong)tfm_read_uintn( stream, 4)
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#define READ_INT4( stream ) (FT_Long)tfm_read_intn( stream, 4)
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/*
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* Reading a Number from file
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*/
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unsigned long
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tfm_read_uintn(FT_Stream stream, int size)
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{
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unsigned long v,k;
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FT_Error error = FT_Err_Ok;
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FT_Byte tp;
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v = 0L;
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while (size >= 1)
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{
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if ( FT_READ_BYTE(tp) )
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return 0;
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k =(unsigned long)tp;
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v = v*256L + k;
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--size;
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}
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return v;
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}
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long
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tfm_read_intn(FT_Stream stream, int size)
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{
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long v;
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FT_Byte tp;
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FT_Error error= FT_Err_Ok;
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unsigned long z ;
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if ( FT_READ_BYTE(tp) )
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return 0;
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z= (unsigned long)tp;
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v = (long)z & 0xffL;
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if (v & 0x80L)
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v = v - 256L;
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--size;
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while (size >= 1)
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{
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if ( FT_READ_BYTE(tp) )
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return 0;
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z= (unsigned long)tp;
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v = v*256L + z;
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--size;
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}
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return v;
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}
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/**************************************************************************
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*
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* API.
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*
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*/
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FT_LOCAL_DEF( FT_Error )
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tfm_init( TFM_Parser parser,
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FT_Memory memory,
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FT_Stream stream )
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{
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parser->memory = memory;
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parser->stream = stream;
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parser->FontInfo = NULL;
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parser->user_data = NULL;
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return FT_Err_Ok;
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}
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FT_LOCAL( void )
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tfm_close( TFM_Parser parser )
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{
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FT_UNUSED( parser );
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/* nothing */
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}
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FT_LOCAL_DEF( FT_Error )
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tfm_parse_metrics( TFM_Parser parser )
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{
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FT_Memory memory = parser->memory;
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TFM_FontInfo fi = parser->FontInfo;
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FT_Stream stream = parser->stream;
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FT_Error error = FT_ERR( Syntax_Error );
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FT_ULong lf, lh, nc, nci;
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FT_ULong offset_char_info, offset_param;
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FT_ULong nw, nh, nd, ni, nl, nk, ne, np, bc, ec;
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FT_Long *w, *h, *d;
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FT_ULong *ci, v;
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FT_ULong i;
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FT_Long bbxw, bbxh, xoff, yoff;
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if ( !fi )
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return FT_THROW( Invalid_Argument );
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fi->width = NULL;
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fi->height = NULL;
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fi->depth = NULL;
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ci = NULL;
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w = NULL;
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h = NULL;
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d = NULL;
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fi->font_bbx_w = 0.0;
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fi->font_bbx_h = 0.0;
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fi->font_bbx_xoff = 0.0;
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fi->font_bbx_yoff = 0.0;
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if( FT_STREAM_SEEK( 0 ) )
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return error;
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/* Checking the correctness of the TFM file */
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if( READ_UINT1( stream ) > 127 )
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{
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FT_ERROR(( "Malformed TFM file: The first byte of the input file exceeds 127!\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_STREAM_SEEK( 0 ) )
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return error;
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lf = READ_UINT2( stream );
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lh = READ_UINT2( stream );
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bc = READ_UINT2( stream );
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ec = READ_UINT2( stream );
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nw = READ_UINT2( stream );
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nh = READ_UINT2( stream );
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nd = READ_UINT2( stream );
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ni = READ_UINT2( stream );
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nl = READ_UINT2( stream );
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nk = READ_UINT2( stream );
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ne = READ_UINT2( stream );
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np = READ_UINT2( stream );
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/* Uncomment this to check for the tfm file's header info if this program returns malformed tfm file */
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/*
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FT_TRACE6(( "tfm_parse_metrics: First 24 bytes in the tfm file:\n"
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" lf : %ld\n"
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" lh : %ld\n"
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" bc : %d\n"
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" ec : %d\n"
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" nw : %d\n"
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" nh : %d\n"
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" nd : %d\n"
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" ni : %d\n"
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" nl : %d\n"
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" nk : %d\n"
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" ne : %d\n"
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" np : %d\n", lf, lh, bc, ec, nw, nh, nd, ni, nl, nk, ne, np ));
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*/
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if( lf == 0 || ((4*lf) - 1) > tfm_size)
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{
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FT_ERROR(( "Malformed TFM file: The file claims to have length zero, but that's impossible!\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(lh < 2)
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{
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FT_ERROR(( "Malformed TFM file: The header length is only %ld\n",lh ));
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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( nl > lig_size )
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{
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FT_ERROR(( "Malformed TFM file: The lig/kern program is longer than I can handle!\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( ne > 256 )
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{
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FT_ERROR(( "Malformed TFM file: There are %ld extensible recipes!\n",ne ));
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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 ( ((signed)(fi->begin_char-1) > (signed)fi->end_char) ||
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( fi->end_char > 255) ||
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( ne > 256 ) )
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{
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FT_ERROR(( "tfm_parse_metrics: Incorrect header information in `tfm' file.\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 ( lf != 6 + lh + (ec - bc + 1) + nw + nh + nd + ni + nl + nk + ne + np )
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{
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FT_ERROR(( "tfm_parse_metrics: Incorrect header information in `tfm' file.\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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fi->begin_char = bc;
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fi->end_char = ec;
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fi->cs = READ_INT4( stream ); /* Check Sum */
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fi->ds = READ_INT4( stream ); /* Design Size */
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fi->design_size = (FT_ULong)((double)(fi->ds)/(double)(1<<20));
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if( fi->cs <= 0 )
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{
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error = FT_THROW( Unknown_File_Format );
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goto Exit;
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}
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nc = fi->end_char - fi->begin_char + 1;
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nci = nc;
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ci = (FT_ULong*)calloc(nci, sizeof(FT_ULong));
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w = (FT_Long*)calloc(nw, sizeof(FT_ULong));
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h = (FT_Long*)calloc(nh, sizeof(FT_ULong));
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d = (FT_Long*)calloc(nd, sizeof(FT_ULong));
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if ((ci == NULL) || (w == NULL) || (h == NULL) || (d == NULL))
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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offset_char_info = 4*(6+lh);
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if( FT_STREAM_SEEK( offset_char_info ) ) /* Skip over coding scheme and font family name */
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goto Exit;
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for (i = 0; i < nci; i++)
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ci[i] = READ_UINT4( stream );
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offset_param = stream->pos + 4*(nw + nh + nd + ni + nl + nk + ne);
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for (i = 0; i < nw; i++)
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w[i] = READ_INT4( stream );
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for (i = 0; i < nh; i++)
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h[i] = READ_INT4( stream );
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for (i = 0; i < nd; i++)
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d[i] = READ_INT4( stream );
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fi->width = (FT_Long*)calloc(nc, sizeof(FT_Long));
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fi->height = (FT_Long*)calloc(nc, sizeof(FT_Long));
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fi->depth = (FT_Long*)calloc(nc, sizeof(FT_Long));
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if ((fi->width == NULL) || (fi->height == NULL) || (fi->depth == NULL))
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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bbxw = 0;
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bbxh = 0;
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xoff = 0;
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yoff = 0;
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for (i = 0; i < nc; i++)
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{
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v = ci[i] / 0x10000L;
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fi->depth[i] = d[v & 0xf]; v >>= 4;
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fi->height[i] = h[v & 0xf]; v >>= 4;
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fi->width[i] = w[v & 0xff];
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if (bbxw < fi->width[i])
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bbxw = fi->width[i];
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if (bbxh < (fi->height[i] + fi->depth[i]))
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bbxh = fi->height[i] + fi->depth[i];
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if (yoff > -fi->depth[i])
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yoff = -fi->depth[i];
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}
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fi->font_bbx_w = (FT_ULong)(fi->design_size * ((double)bbxw / (double)(1<<20)));
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fi->font_bbx_h = (FT_ULong)(fi->design_size * ((FT_ULong)bbxh / (double)(1<<20)));
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fi->font_bbx_xoff = (FT_ULong)(fi->design_size * ((double)xoff / (double)(1<<20)));
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fi->font_bbx_yoff = (FT_ULong)(fi->design_size * ((double)yoff / (double)(1<<20)));
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if( FT_STREAM_SEEK( offset_param ) )
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return error;
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if (FT_READ_ULONG(fi->slant) )
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return error;
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fi->slant = (FT_ULong)((double)fi->slant/(double)(1<<20));
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Exit:
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FT_FREE(ci);
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FT_FREE(w);
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FT_FREE(h);
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FT_FREE(d);
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return error;
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}
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/* END */
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