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@ -4,7 +4,7 @@ |
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/* */ |
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/* TrueType character mapping table (cmap) support (body). */ |
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/* */ |
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/* Copyright 2002, 2003, 2004, 2005, 2006, 2007 by */ |
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/* Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008 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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@ -134,7 +134,7 @@ |
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FT_UInt gindex = 0; |
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table += 6; /* go to glyph ids */ |
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table += 6; /* go to glyph IDs */ |
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while ( ++charcode < 256 ) |
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{ |
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gindex = table[charcode]; |
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@ -260,14 +260,14 @@ |
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/* */ |
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/* * The value of `offset' is read. This is a _byte_ distance from the */ |
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/* location of the `offset' field itself into a slice of the */ |
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/* `glyph_ids' table. Let's call it `slice' (it's a USHORT[] too). */ |
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/* `glyph_ids' table. Let's call it `slice' (it is a USHORT[] too). */ |
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/* */ |
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/* * The value `slice[char.lo - first]' is read. If it is 0, there is */ |
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/* no glyph for the charcode. Otherwise, the value of `delta' is */ |
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/* added to it (modulo 65536) to form a new glyph index. */ |
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/* */ |
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/* It is up to the validation routine to check that all offsets fall */ |
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/* within the glyph ids table (and not within the `subs' table itself or */ |
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/* within the glyph IDs table (and not within the `subs' table itself or */ |
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/* outside of the CMap). */ |
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/* */ |
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@ -342,7 +342,7 @@ |
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if ( ids < glyph_ids || ids + code_count*2 > table + length ) |
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FT_INVALID_OFFSET; |
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/* check glyph ids */ |
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/* check glyph IDs */ |
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if ( valid->level >= FT_VALIDATE_TIGHT ) |
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{ |
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FT_Byte* limit = p + code_count * 2; |
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@ -393,7 +393,7 @@ |
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sub = subs; /* jump to first sub-header */ |
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/* check that the sub-header for this byte is 0, which */ |
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/* indicates that it's really a valid one-byte value */ |
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/* indicates that it is really a valid one-byte value */ |
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/* Otherwise, return 0 */ |
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/* */ |
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p += char_lo * 2; |
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@ -621,7 +621,7 @@ |
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/* charcode within the segment is obtained by adding the value of */ |
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/* `idDelta' directly to the charcode, modulo 65536. */ |
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/* */ |
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/* Otherwise, a glyph index is taken from the glyph ids sub-array for */ |
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/* Otherwise, a glyph index is taken from the glyph IDs sub-array for */ |
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/* the segment, and the value of `idDelta' is added to it. */ |
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/* */ |
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/* */ |
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@ -831,7 +831,7 @@ |
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/* */ |
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if ( valid->level >= FT_VALIDATE_PARANOID ) |
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{ |
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/* check the values of 'searchRange', 'entrySelector', 'rangeShift' */ |
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/* check the values of `searchRange', `entrySelector', `rangeShift' */ |
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FT_UInt search_range = TT_NEXT_USHORT( p ); |
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FT_UInt entry_selector = TT_NEXT_USHORT( p ); |
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FT_UInt range_shift = TT_NEXT_USHORT( p ); |
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@ -858,7 +858,7 @@ |
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offsets = deltas + num_segs * 2; |
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glyph_ids = offsets + num_segs * 2; |
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/* check last segment, its end count must be FFFF */ |
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/* check last segment, its end count must be 0xFFFF */ |
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if ( valid->level >= FT_VALIDATE_PARANOID ) |
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{ |
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p = ends + ( num_segs - 1 ) * 2; |
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@ -867,9 +867,9 @@ |
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} |
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{ |
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FT_UInt start, end, offset, n; |
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FT_UInt last_start = 0, last_end = 0; |
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FT_Int delta; |
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FT_UInt start, end, offset, n; |
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FT_UInt last_start = 0, last_end = 0; |
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FT_Int delta; |
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FT_Byte* p_start = starts; |
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FT_Byte* p_end = ends; |
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FT_Byte* p_delta = deltas; |
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@ -911,14 +911,18 @@ |
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{ |
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p += offset; /* start of glyph id array */ |
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/* check that we point within the glyph ids table only */ |
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/* check that we point within the glyph IDs table only */ |
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if ( valid->level >= FT_VALIDATE_TIGHT ) |
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{ |
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if ( p < glyph_ids || |
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p + ( end - start + 1 ) * 2 > table + length ) |
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FT_INVALID_DATA; |
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} |
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else |
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/* some fonts handle the last segment incorrectly */ |
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else if ( n != num_segs - 1 || |
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!( start == 0xFFFFU && |
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end == 0xFFFFU && |
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delta == 0x1U ) ) |
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{ |
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if ( p < glyph_ids || |
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p + ( end - start + 1 ) * 2 > valid->limit ) |
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@ -946,7 +950,7 @@ |
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} |
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else if ( offset == 0xFFFFU ) |
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{ |
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/* Some fonts (erroneously?) use a range offset of 0xFFFF */ |
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/* some fonts (erroneously?) use a range offset of 0xFFFF */ |
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/* to mean missing glyph in cmap table */ |
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/* */ |
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if ( valid->level >= FT_VALIDATE_PARANOID || |
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@ -1009,6 +1013,12 @@ |
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p += num_segs2; |
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offset = TT_PEEK_USHORT( p ); |
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/* some fonts handle the last segment incorrectly; */ |
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/* we have to catch it */ |
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if ( i >= num_segs - 1 && |
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start == 0xFFFFU && end == 0xFFFFU && delta == 0x1U ) |
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offset = 0; |
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if ( offset == 0xFFFFU ) |
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continue; |
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@ -1088,6 +1098,12 @@ |
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p += num_segs2; |
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offset = TT_PEEK_USHORT( p ); |
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/* some fonts handle the last segment incorrectly; */ |
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/* we have to catch it */ |
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if ( mid >= num_segs - 1 && |
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start == 0xFFFFU && end == 0xFFFFU && delta == 0x1U ) |
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offset = 0; |
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/* search the first segment containing `charcode' */ |
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if ( cmap->flags & TT_CMAP_FLAG_OVERLAPPING ) |
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{ |
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@ -1359,7 +1375,7 @@ |
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/* */ |
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/* first 6 USHORT first segment code */ |
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/* count 8 USHORT segment size in chars */ |
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/* glyphIds 10 USHORT[count] glyph ids */ |
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/* glyphIds 10 USHORT[count] glyph IDs */ |
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/* */ |
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/* A very simplified segment mapping. */ |
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/* */ |
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@ -1506,7 +1522,7 @@ |
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/***** *****/ |
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/***** FORMAT 8 *****/ |
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/***** *****/ |
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/***** It's hard to completely understand what the OpenType spec *****/ |
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/***** It is hard to completely understand what the OpenType spec *****/ |
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/***** says about this format, but here is my conclusion. *****/ |
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/***** *****/ |
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/***** The purpose of this format is to easily map UTF-16 text to *****/ |
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@ -1521,7 +1537,7 @@ |
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/***** `char_hi' and `char_lo' must be in the Surrogates Area. *****/ |
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/***** Area. *****/ |
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/***** *****/ |
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/***** The 'is32' table embedded in the charmap indicates whether a *****/ |
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/***** The `is32' table embedded in the charmap indicates whether a *****/ |
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/***** given 16-bit value is in the surrogates area or not. *****/ |
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/***** *****/ |
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/***** So, for any given `char_code', we can assert the following: *****/ |
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@ -1548,7 +1564,7 @@ |
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/* is32 12 BYTE[8192] 32-bitness bitmap */ |
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/* count 8204 ULONG number of groups */ |
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/* */ |
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/* This header is followed by 'count' groups of the following format: */ |
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/* This header is followed by `count' groups of the following format: */ |
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/* */ |
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/* start 0 ULONG first charcode */ |
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/* end 4 ULONG last charcode */ |
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@ -2727,7 +2743,7 @@ |
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FT_UInt tot = 0; |
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p += 3; /* point to the first 'cnt' field */ |
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p += 3; /* point to the first `cnt' field */ |
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for ( ; numRanges > 0; numRanges-- ) |
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{ |
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tot += 1 + p[0]; |
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Werner Lemberg
17 years ago