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@ -1,3 +1,20 @@ |
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/***************************************************************************/ |
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/* */ |
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/* ftpatent.c */ |
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/* */ |
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/* FreeType API for checking patented TrueType bytecode instructions */ |
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/* (body). */ |
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/* */ |
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/* Copyright 2007 by David Turner. */ |
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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_TRUETYPE_TAGS_H |
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@ -6,21 +23,23 @@ |
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#include FT_SERVICE_SFNT_H |
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#include FT_SERVICE_TRUETYPE_GLYF_H |
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static FT_Bool |
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_tt_check_patents_in_range( FT_Stream stream, |
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FT_ULong size ) |
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{ |
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FT_Bool result = 0; |
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FT_Bool result = FALSE; |
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FT_Error error; |
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FT_Bytes p, end; |
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if ( FT_FRAME_ENTER(size) ) |
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if ( FT_FRAME_ENTER( size ) ) |
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return 0; |
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p = stream->cursor; |
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end = p + size; |
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while (p < end) |
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while ( p < end ) |
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{ |
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switch (p[0]) |
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{ |
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@ -28,23 +47,23 @@ |
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case 0x07: /* SPvTL + */ |
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case 0x08: /* SFvTL // */ |
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case 0x09: /* SFvTL + */ |
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case 0x0A: /* SPvFS */ |
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case 0x0B: /* SFvFS */ |
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result = 1; |
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case 0x0A: /* SPvFS */ |
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case 0x0B: /* SFvFS */ |
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result = TRUE; |
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goto Exit; |
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case 0x40: |
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if ( p+1 >= end ) |
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if ( p + 1 >= end ) |
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goto Exit; |
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p += p[1] + 2; |
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break; |
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case 0x41: |
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if ( p+1 >= end ) |
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if ( p + 1 >= end ) |
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goto Exit; |
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p += p[1]*2 + 2; |
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p += p[1] * 2 + 2; |
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break; |
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case 0x71: /* DELTAP2 */ |
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@ -52,7 +71,7 @@ |
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case 0x73: /* DELTAC0 */ |
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case 0x74: /* DELTAC1 */ |
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case 0x75: /* DELTAC2 */ |
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result = 1; |
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result = TRUE; |
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goto Exit; |
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case 0xB0: |
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@ -63,7 +82,7 @@ |
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case 0xB5: |
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case 0xB6: |
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case 0xB7: |
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p += (p[0] - 0xB0) + 2; |
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p += ( p[0] - 0xB0 ) + 2; |
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break; |
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case 0xB8: |
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@ -74,7 +93,7 @@ |
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case 0xBD: |
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case 0xBE: |
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case 0xBF: |
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p += (p[0] - 0xB8) * 2 + 3; |
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p += ( p[0] - 0xB8 ) * 2 + 3; |
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break; |
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default: |
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@ -96,14 +115,16 @@ |
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FT_Stream stream = face->stream; |
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FT_Error error; |
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FT_Service_SFNT_Table service; |
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FT_Bool result = 0; |
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FT_Bool result = FALSE; |
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FT_FACE_FIND_SERVICE( face, service, SFNT_TABLE ); |
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if (service) |
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if ( service ) |
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{ |
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FT_ULong offset, size; |
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error = service->table_info( face, tag, &offset, &size ); |
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if ( error || |
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FT_STREAM_SEEK( offset ) ) |
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@ -111,6 +132,7 @@ |
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result = _tt_check_patents_in_range( stream, size ); |
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} |
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Exit: |
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return result; |
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} |
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@ -126,40 +148,43 @@ |
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FT_Service_TTGlyf service; |
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result = _tt_check_patents_in_table( face, TTAG_fpgm ); |
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if (result) |
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if ( result ) |
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goto Exit; |
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result = _tt_check_patents_in_table( face, TTAG_prep ); |
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if (result) |
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if ( result ) |
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goto Exit; |
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FT_FACE_FIND_SERVICE( face, service, TT_GLYF ); |
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if (service == NULL) |
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if ( service == NULL ) |
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goto Exit; |
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for (gindex = 0; gindex < (FT_UInt)face->num_glyphs; gindex++) |
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for ( gindex = 0; gindex < (FT_UInt)face->num_glyphs; gindex++ ) |
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{ |
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FT_ULong offset, num_ins, size; |
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FT_Int num_contours; |
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offset = service->get_location( face, gindex, &size ); |
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if (size == 0) |
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if ( size == 0 ) |
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continue; |
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if ( FT_STREAM_SEEK(offset) || |
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FT_READ_SHORT(num_contours) ) |
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if ( FT_STREAM_SEEK( offset ) || |
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FT_READ_SHORT( num_contours ) ) |
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continue; |
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if (num_contours >= 0) /* simple glyph */ |
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if ( num_contours >= 0 ) /* simple glyph */ |
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{ |
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if ( FT_STREAM_SKIP( 8 + num_contours*2 ) ) |
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if ( FT_STREAM_SKIP( 8 + num_contours * 2 ) ) |
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continue; |
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} |
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else /* compound glyph */ |
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{ |
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FT_Bool has_instr = 0; |
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if ( FT_STREAM_SKIP( 8 ) ) |
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continue; |
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@ -168,56 +193,65 @@ |
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{ |
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FT_UInt flags, toskip; |
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if( FT_READ_USHORT(flags) ) |
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if( FT_READ_USHORT( flags ) ) |
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break; |
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toskip = 2 + 1 + 1; |
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if ((flags & (1 << 0)) != 0) /* ARGS_ARE_WORDS */ |
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if ( ( flags & ( 1 << 0 ) ) != 0 ) /* ARGS_ARE_WORDS */ |
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toskip += 2; |
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if ((flags & (1 << 3)) != 0) /* WE_HAVE_A_SCALE */ |
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if ( ( flags & ( 1 << 3 ) ) != 0 ) /* WE_HAVE_A_SCALE */ |
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toskip += 2; |
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else if ((flags & (1 << 6)) != 0) /* WE_HAVE_X_Y_SCALE */ |
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else if ( ( flags & ( 1 << 6 ) ) != 0 ) /* WE_HAVE_X_Y_SCALE */ |
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toskip += 4; |
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else if ((flags & (1 << 7)) != 0) /* WE_HAVE_A_2x2 */ |
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else if ( ( flags & ( 1 << 7 ) ) != 0 ) /* WE_HAVE_A_2x2 */ |
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toskip += 8; |
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if ((flags & (1 << 8)) != 0) /* WE_HAVE_INSTRUCTIONS */ |
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if ( ( flags & ( 1 << 8 ) ) != 0 ) /* WE_HAVE_INSTRUCTIONS */ |
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has_instr = 1; |
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if ( FT_STREAM_SKIP( toskip ) ) |
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goto NextGlyph; |
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if ((flags & (1 << 5)) == 0) /* MORE_COMPONENTS */ |
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if ( ( flags & ( 1 << 5 ) ) == 0 ) /* MORE_COMPONENTS */ |
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break; |
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} |
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if (!has_instr) |
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if ( !has_instr ) |
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goto NextGlyph; |
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} |
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if ( FT_READ_USHORT(num_ins) ) |
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if ( FT_READ_USHORT( num_ins ) ) |
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continue; |
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result = _tt_check_patents_in_range( stream, num_ins ); |
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if (result) |
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if ( result ) |
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goto Exit; |
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NextGlyph: |
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; |
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} |
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Exit: |
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return result; |
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} |
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/* documentation is in freetype.h */ |
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FT_EXPORT_DEF( FT_Bool ) |
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FT_Face_CheckTrueTypePatents( FT_Face face ) |
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FT_Face_CheckTrueTypePatents( FT_Face face ) |
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{ |
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FT_Bool result = 0; |
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FT_Bool result = FALSE; |
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if ( face && FT_IS_SFNT(face) ) |
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{ |
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if ( face && FT_IS_SFNT( face ) ) |
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result = _tt_face_check_patents( face ); |
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} |
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return result; |
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return result; |
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} |
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/* END */ |
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Werner Lemberg
18 years ago