kc3-lang/freetype/src/sfnt/ttcmap.c
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Hash : fa420250
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Date : 2005-05-11T20:04:35
* include/freetype/ftimage.h (FT_Raster_RenderFunc), include/freetype/ftrender.h (FT_Glyph_TransformFunc, FT_Renderer_Render_Func, FT_Renderer_TransformFunc), src/base/ftglyph.c (ft_outline_glyph_transform), src/raster/ftrend1.c (ft_raster1_transform, ft_raster1_render), src/smooth/ftgrays.c (FT_Outline_Decompose, gray_raster_render), src/smooth/ftsmooth.c (ft_smooth_transform, ft_smooth_render_generic, ft_smooth_render, ft_smooth_render_lcd, ft_smooth_render_lcd_v): Decorate parameters with `const' where appropriate. * src/raster/ftraster.c (RASTER_RENDER_POOL): Removed. Obsolete. (ft_black_render): Decorate parameters with `const' where appropriate. * src/sfnt/ttcmap.c (tt_cmap4_set_range): Fix typo (FT_PEEK_SHORT -> FT_PEEK_USHORT) which caused crashes. Reported by Ismail Donmez <ismail@kde.org.tr>.
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src/sfnt/ttcmap.c
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/***************************************************************************/ /* */ /* ttcmap.c */ /* */ /* TrueType character mapping table (cmap) support (body). */ /* */ /* Copyright 2002, 2003, 2004, 2005 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include "sferrors.h" /* must come before FT_INTERNAL_VALIDATE_H */ #include FT_INTERNAL_VALIDATE_H #include FT_INTERNAL_STREAM_H #include "ttload.h" #include "ttcmap.h" /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_ttcmap #define TT_PEEK_SHORT FT_PEEK_SHORT #define TT_PEEK_USHORT FT_PEEK_USHORT #define TT_PEEK_LONG FT_PEEK_LONG #define TT_PEEK_ULONG FT_PEEK_ULONG #define TT_NEXT_SHORT FT_NEXT_SHORT #define TT_NEXT_USHORT FT_NEXT_USHORT #define TT_NEXT_LONG FT_NEXT_LONG #define TT_NEXT_ULONG FT_NEXT_ULONG FT_CALLBACK_DEF( FT_Error ) tt_cmap_init( TT_CMap cmap, FT_Byte* table ) { cmap->data = table; return SFNT_Err_Ok; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 0 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 0 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* glyph_ids 6 BYTE[256] array of glyph indices */ /* 262 */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_0 FT_CALLBACK_DEF( FT_Error ) tt_cmap0_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; FT_UInt length = TT_NEXT_USHORT( p ); if ( table + length > valid->limit || length < 262 ) FT_INVALID_TOO_SHORT; /* check glyph indices whenever necessary */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt n, idx; p = table + 6; for ( n = 0; n < 256; n++ ) { idx = *p++; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } return SFNT_Err_Ok; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap0_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; return char_code < 256 ? table[6 + char_code] : 0; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap0_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 charcode = *pchar_code; FT_UInt32 result = 0; FT_UInt gindex = 0; table += 6; /* go to glyph ids */ while ( ++charcode < 256 ) { gindex = table[charcode]; if ( gindex != 0 ) { result = charcode; break; } } *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap0_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap0_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap0_char_index, (FT_CMap_CharNextFunc) tt_cmap0_char_next }, 0, (TT_CMap_ValidateFunc) tt_cmap0_validate, (TT_CMap_Info_GetFunc) tt_cmap0_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_0 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 2 *****/ /***** *****/ /***** This is used for certain CJK encodings that encode text in a *****/ /***** mixed 8/16 bits encoding along the following lines: *****/ /***** *****/ /***** * Certain byte values correspond to an 8-bit character code *****/ /***** (typically in the range 0..127 for ASCII compatibility). *****/ /***** *****/ /***** * Certain byte values signal the first byte of a 2-byte *****/ /***** character code (but these values are also valid as the *****/ /***** second byte of a 2-byte character). *****/ /***** *****/ /***** The following charmap lookup and iteration functions all *****/ /***** assume that the value "charcode" correspond to following: *****/ /***** *****/ /***** - For one byte characters, "charcode" is simply the *****/ /***** character code. *****/ /***** *****/ /***** - For two byte characters, "charcode" is the 2-byte *****/ /***** character code in big endian format. More exactly: *****/ /***** *****/ /***** (charcode >> 8) is the first byte value *****/ /***** (charcode & 0xFF) is the second byte value *****/ /***** *****/ /***** Note that not all values of "charcode" are valid according *****/ /***** to these rules, and the function moderately check the *****/ /***** arguments. *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 2 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* keys 6 USHORT[256] sub-header keys */ /* subs 518 SUBHEAD[NSUBS] sub-headers array */ /* glyph_ids 518+NSUB*8 USHORT[] glyph id array */ /* */ /* The `keys' table is used to map charcode high-bytes to sub-headers. */ /* The value of `NSUBS' is the number of sub-headers defined in the */ /* table and is computed by finding the maximum of the `keys' table. */ /* */ /* Note that for any n, `keys[n]' is a byte offset within the `subs' */ /* table, i.e., it is the corresponding sub-header index multiplied */ /* by 8. */ /* */ /* Each sub-header has the following format: */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* first 0 USHORT first valid low-byte */ /* count 2 USHORT number of valid low-bytes */ /* delta 4 SHORT see below */ /* offset 6 USHORT see below */ /* */ /* A sub-header defines, for each high-byte, the range of valid */ /* low-bytes within the charmap. Note that the range defined by `first' */ /* and `count' must be completely included in the interval [0..255] */ /* according to the specification. */ /* */ /* If a character code is contained within a given sub-header, then */ /* mapping it to a glyph index is done as follows: */ /* */ /* * The value of `offset' is read. This is a _byte_ distance from the */ /* location of the `offset' field itself into a slice of the */ /* `glyph_ids' table. Let's call it `slice' (it's a USHORT[] too). */ /* */ /* * The value `slice[char.lo - first]' is read. If it is 0, there is */ /* no glyph for the charcode. Otherwise, the value of `delta' is */ /* added to it (modulo 65536) to form a new glyph index. */ /* */ /* It is up to the validation routine to check that all offsets fall */ /* within the glyph ids table (and not within the `subs' table itself or */ /* outside of the CMap). */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_2 FT_CALLBACK_DEF( FT_Error ) tt_cmap2_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; /* skip format */ FT_UInt length = TT_PEEK_USHORT( p ); FT_UInt n, max_subs; FT_Byte* keys; /* keys table */ FT_Byte* subs; /* sub-headers */ FT_Byte* glyph_ids; /* glyph id array */ if ( table + length > valid->limit || length < 6 + 512 ) FT_INVALID_TOO_SHORT; keys = table + 6; /* parse keys to compute sub-headers count */ p = keys; max_subs = 0; for ( n = 0; n < 256; n++ ) { FT_UInt idx = TT_NEXT_USHORT( p ); /* value must be multiple of 8 */ if ( valid->level >= FT_VALIDATE_PARANOID && ( idx & 7 ) != 0 ) FT_INVALID_DATA; idx >>= 3; if ( idx > max_subs ) max_subs = idx; } FT_ASSERT( p == table + 518 ); subs = p; glyph_ids = subs + (max_subs + 1) * 8; if ( glyph_ids > valid->limit ) FT_INVALID_TOO_SHORT; /* parse sub-headers */ for ( n = 0; n <= max_subs; n++ ) { FT_UInt first_code, code_count, offset; FT_Int delta; FT_Byte* ids; first_code = TT_NEXT_USHORT( p ); code_count = TT_NEXT_USHORT( p ); delta = TT_NEXT_SHORT( p ); offset = TT_NEXT_USHORT( p ); /* check range within 0..255 */ if ( valid->level >= FT_VALIDATE_PARANOID ) { if ( first_code >= 256 || first_code + code_count > 256 ) FT_INVALID_DATA; } /* check offset */ if ( offset != 0 ) { ids = p - 2 + offset; if ( ids < glyph_ids || ids + code_count*2 > table + length ) FT_INVALID_OFFSET; /* check glyph ids */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_Byte* limit = p + code_count * 2; FT_UInt idx; for ( ; p < limit; ) { idx = TT_NEXT_USHORT( p ); if ( idx != 0 ) { idx = ( idx + delta ) & 0xFFFFU; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } } } return SFNT_Err_Ok; } /* return sub header corresponding to a given character code */ /* NULL on invalid charcode */ static FT_Byte* tt_cmap2_get_subheader( FT_Byte* table, FT_UInt32 char_code ) { FT_Byte* result = NULL; if ( char_code < 0x10000UL ) { FT_UInt char_lo = (FT_UInt)( char_code & 0xFF ); FT_UInt char_hi = (FT_UInt)( char_code >> 8 ); FT_Byte* p = table + 6; /* keys table */ FT_Byte* subs = table + 518; /* subheaders table */ FT_Byte* sub; if ( char_hi == 0 ) { /* an 8-bit character code -- we use subHeader 0 in this case */ /* to test whether the character code is in the charmap */ /* */ sub = subs; /* jump to first sub-header */ /* check that the sub-header for this byte is 0, which */ /* indicates that it's really a valid one-byte value */ /* Otherwise, return 0 */ /* */ p += char_lo * 2; if ( TT_PEEK_USHORT( p ) != 0 ) goto Exit; } else { /* a 16-bit character code */ /* jump to key entry */ p += char_hi * 2; /* jump to sub-header */ sub = subs + ( FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 8 ) ); /* check that the high byte isn't a valid one-byte value */ if ( sub == subs ) goto Exit; } result = sub; } Exit: return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap2_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* subheader; subheader = tt_cmap2_get_subheader( table, char_code ); if ( subheader ) { FT_Byte* p = subheader; FT_UInt idx = (FT_UInt)(char_code & 0xFF); FT_UInt start, count; FT_Int delta; FT_UInt offset; start = TT_NEXT_USHORT( p ); count = TT_NEXT_USHORT( p ); delta = TT_NEXT_SHORT ( p ); offset = TT_PEEK_USHORT( p ); idx -= start; if ( idx < count && offset != 0 ) { p += offset + 2 * idx; idx = TT_PEEK_USHORT( p ); if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap2_char_next( TT_CMap cmap, FT_UInt32 *pcharcode ) { FT_Byte* table = cmap->data; FT_UInt gindex = 0; FT_UInt32 result = 0; FT_UInt32 charcode = *pcharcode + 1; FT_Byte* subheader; while ( charcode < 0x10000UL ) { subheader = tt_cmap2_get_subheader( table, charcode ); if ( subheader ) { FT_Byte* p = subheader; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_Int delta = TT_NEXT_SHORT ( p ); FT_UInt offset = TT_PEEK_USHORT( p ); FT_UInt char_lo = (FT_UInt)( charcode & 0xFF ); FT_UInt pos, idx; if ( offset == 0 ) goto Next_SubHeader; if ( char_lo < start ) { char_lo = start; pos = 0; } else pos = (FT_UInt)( char_lo - start ); p += offset + pos * 2; charcode = FT_PAD_FLOOR( charcode, 256 ) + char_lo; for ( ; pos < count; pos++, charcode++ ) { idx = TT_NEXT_USHORT( p ); if ( idx != 0 ) { gindex = ( idx + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = charcode; goto Exit; } } } } /* jump to next sub-header, i.e. higher byte value */ Next_SubHeader: charcode = FT_PAD_FLOOR( charcode, 256 ) + 256; } Exit: *pcharcode = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap2_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap2_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap2_char_index, (FT_CMap_CharNextFunc) tt_cmap2_char_next }, 2, (TT_CMap_ValidateFunc) tt_cmap2_validate, (TT_CMap_Info_GetFunc) tt_cmap2_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_2 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 4 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 4 */ /* length 2 USHORT table length */ /* in bytes */ /* language 4 USHORT Mac language code */ /* */ /* segCountX2 6 USHORT 2*NUM_SEGS */ /* searchRange 8 USHORT 2*(1 << LOG_SEGS) */ /* entrySelector 10 USHORT LOG_SEGS */ /* rangeShift 12 USHORT segCountX2 - */ /* searchRange */ /* */ /* endCount 14 USHORT[NUM_SEGS] end charcode for */ /* each segment; last */ /* is 0xFFFF */ /* */ /* pad 14+NUM_SEGS*2 USHORT padding */ /* */ /* startCount 16+NUM_SEGS*2 USHORT[NUM_SEGS] first charcode for */ /* each segment */ /* */ /* idDelta 16+NUM_SEGS*4 SHORT[NUM_SEGS] delta for each */ /* segment */ /* idOffset 16+NUM_SEGS*6 SHORT[NUM_SEGS] range offset for */ /* each segment; can be */ /* zero */ /* */ /* glyphIds 16+NUM_SEGS*8 USHORT[] array of glyph id */ /* ranges */ /* */ /* Character codes are modelled by a series of ordered (increasing) */ /* intervals called segments. Each segment has start and end codes, */ /* provided by the `startCount' and `endCount' arrays. Segments must */ /* not be overlapping and the last segment should always contain the */ /* `0xFFFF' endCount. */ /* */ /* The fields `searchRange', `entrySelector' and `rangeShift' are better */ /* ignored (they are traces of over-engineering in the TrueType */ /* specification). */ /* */ /* Each segment also has a signed `delta', as well as an optional offset */ /* within the `glyphIds' table. */ /* */ /* If a segment's idOffset is 0, the glyph index corresponding to any */ /* charcode within the segment is obtained by adding the value of */ /* `idDelta' directly to the charcode, modulo 65536. */ /* */ /* Otherwise, a glyph index is taken from the glyph ids sub-array for */ /* the segment, and the value of `idDelta' is added to it. */ /* */ /* */ /* Finally, note that certain fonts contain invalid charmaps that */ /* contain end=0xFFFF, start=0xFFFF, delta=0x0001, offset=0xFFFF at the */ /* of their charmaps (e.g. opens___.ttf which comes with OpenOffice.org) */ /* we need special code to deal with them correctly... */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_4 #define OPT_CMAP4 #ifdef OPT_CMAP4 typedef struct TT_CMap4Rec_ { TT_CMapRec cmap; FT_UInt32 old_charcode; /* old charcode */ FT_UInt32 cur_charcode; /* current charcode */ FT_UInt cur_gindex; /* current glyph index */ FT_UInt table_length; FT_UInt num_ranges; FT_UInt cur_range; FT_UInt cur_start; FT_UInt cur_end; FT_Int cur_delta; FT_Byte* cur_values; } TT_CMap4Rec, *TT_CMap4; FT_CALLBACK_DEF( FT_Error ) tt_cmap4_init( TT_CMap4 cmap, FT_Byte* table ) { FT_Byte* p; cmap->cmap.data = table; p = table + 2; cmap->table_length = FT_PEEK_USHORT( p ); p = table + 6; cmap->num_ranges = FT_PEEK_USHORT( p ) >> 1; cmap->cur_range = cmap->num_ranges; cmap->old_charcode = 0xFFFFFFFFUL; cmap->cur_charcode = 0; cmap->cur_gindex = 0; return SFNT_Err_Ok; } static FT_Int tt_cmap4_set_range( TT_CMap4 cmap, FT_UInt range_index ) { FT_Byte* table = cmap->cmap.data; FT_Byte* p; FT_UInt num_ranges = cmap->num_ranges; while ( range_index < num_ranges ) { FT_UInt offset; p = table + 14 + range_index * 2; cmap->cur_end = FT_PEEK_USHORT( p ); p += 2 + num_ranges * 2; cmap->cur_start = FT_PEEK_USHORT( p ); p += num_ranges * 2; cmap->cur_delta = FT_PEEK_SHORT( p ); p += num_ranges * 2; offset = FT_PEEK_USHORT( p ); if ( offset != 0xFFFFU ) { cmap->cur_values = offset ? p + offset : NULL; cmap->cur_range = range_index; return 0; } /* we skip empty segments */ range_index++; } cmap->old_charcode = 0xFFFFFFFFUL; cmap->cur_charcode = 0; cmap->cur_gindex = 0; cmap->cur_range = num_ranges; return -1; } static void tt_cmap4_next( TT_CMap4 cmap ) { FT_UInt charcode = cmap->cur_charcode + 1; cmap->old_charcode = cmap->cur_charcode; for ( ;; ) { FT_Byte* values = cmap->cur_values; FT_UInt end = cmap->cur_end; FT_Int delta = cmap->cur_delta; if ( charcode <= end ) { if ( values ) { FT_Byte* p = values + 2 * ( charcode - cmap->cur_start ); do { FT_UInt gindex = FT_NEXT_USHORT( p ); if ( gindex != 0 ) { gindex = (FT_UInt)( ( gindex + delta ) & 0xFFFFU ); if ( gindex != 0 ) { cmap->cur_charcode = charcode; cmap->cur_gindex = gindex; return; } } } while ( ++charcode <= end ); } else { do { FT_UInt gindex = (FT_UInt)( ( charcode + delta ) & 0xFFFFU ); if ( gindex != 0 ) { cmap->cur_charcode = charcode; cmap->cur_gindex = gindex; return; } } while ( ++charcode <= end ); } } /* we need to find another range */ if ( tt_cmap4_set_range( cmap, cmap->cur_range + 1 ) < 0 ) break; charcode = cmap->cur_start; } } static void tt_cmap4_reset( TT_CMap4 cmap, FT_UInt code, FT_UInt range_index ) { if ( tt_cmap4_set_range( cmap, range_index ) >= 0 ) { cmap->cur_charcode = code; tt_cmap4_next( cmap ); } } #endif /* OPT_CMAP4 */ FT_CALLBACK_DEF( FT_Error ) tt_cmap4_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; /* skip format */ FT_UInt length = TT_NEXT_USHORT( p ); FT_Byte *ends, *starts, *offsets, *deltas, *glyph_ids; FT_UInt num_segs; FT_Error error = SFNT_Err_Ok; /* in certain fonts, the `length' field is invalid and goes */ /* out of bound. We try to correct this here... */ if ( length < 16 ) FT_INVALID_TOO_SHORT; if ( table + length > valid->limit ) { if ( valid->level >= FT_VALIDATE_TIGHT ) FT_INVALID_TOO_SHORT; length = (FT_UInt)( valid->limit - table ); } p = table + 6; num_segs = TT_NEXT_USHORT( p ); /* read segCountX2 */ if ( valid->level >= FT_VALIDATE_PARANOID ) { /* check that we have an even value here */ if ( num_segs & 1 ) FT_INVALID_DATA; } num_segs /= 2; /* check the search parameters - even though we never use them */ /* */ if ( valid->level >= FT_VALIDATE_PARANOID ) { /* check the values of 'searchRange', 'entrySelector', 'rangeShift' */ FT_UInt search_range = TT_NEXT_USHORT( p ); FT_UInt entry_selector = TT_NEXT_USHORT( p ); FT_UInt range_shift = TT_NEXT_USHORT( p ); if ( ( search_range | range_shift ) & 1 ) /* must be even values */ FT_INVALID_DATA; search_range /= 2; range_shift /= 2; /* `search range' is the greatest power of 2 that is <= num_segs */ if ( search_range > num_segs || search_range * 2 < num_segs || search_range + range_shift != num_segs || search_range != ( 1U << entry_selector ) ) FT_INVALID_DATA; } ends = table + 14; starts = table + 16 + num_segs * 2; deltas = starts + num_segs * 2; offsets = deltas + num_segs * 2; glyph_ids = offsets + num_segs * 2; if ( glyph_ids > table + length ) FT_INVALID_TOO_SHORT; /* check last segment, its end count must be FFFF */ if ( valid->level >= FT_VALIDATE_PARANOID ) { p = ends + ( num_segs - 1 ) * 2; if ( TT_PEEK_USHORT( p ) != 0xFFFFU ) FT_INVALID_DATA; } /* check that segments are sorted in increasing order and do not */ /* overlap; check also the offsets */ { FT_UInt start, end, last = 0, offset, n; FT_Int delta; for ( n = 0; n < num_segs; n++ ) { p = starts + n * 2; start = TT_PEEK_USHORT( p ); p = ends + n * 2; end = TT_PEEK_USHORT( p ); p = deltas + n * 2; delta = TT_PEEK_SHORT( p ); p = offsets + n * 2; offset = TT_PEEK_USHORT( p ); if ( start > end ) FT_INVALID_DATA; /* this test should be performed at default validation level; */ /* unfortunately, some popular Asian fonts present overlapping */ /* ranges in their charmaps */ /* */ if ( n > 0 && start <= last ) { if ( valid->level >= FT_VALIDATE_TIGHT ) FT_INVALID_DATA; else error = SFNT_Err_Invalid_CharMap_Format; } if ( offset && offset != 0xFFFFU ) { p += offset; /* start of glyph id array */ /* check that we point within the glyph ids table only */ if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( p < glyph_ids || p + ( end - start + 1 ) * 2 > table + length ) FT_INVALID_DATA; } else { if ( p < glyph_ids || p + ( end - start + 1 ) * 2 > valid->limit ) FT_INVALID_DATA; } /* check glyph indices within the segment range */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt i, idx; for ( i = start; i < end; i++ ) { idx = FT_NEXT_USHORT( p ); if ( idx != 0 ) { idx = (FT_UInt)( idx + delta ) & 0xFFFFU; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } } else if ( offset == 0xFFFFU ) { /* Some fonts (erroneously?) use a range offset of 0xFFFF */ /* to mean missing glyph in cmap table */ /* */ if ( valid->level >= FT_VALIDATE_PARANOID || n != num_segs - 1 || !( start == 0xFFFFU && end == 0xFFFFU && delta == 0x1U ) ) FT_INVALID_DATA; } last = end; } } return error; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap4_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; if ( char_code < 0x10000UL ) { FT_UInt idx, num_segs2; FT_Int delta; FT_UInt code = (FT_UInt)char_code; FT_Byte* p; p = table + 6; num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 ); /* be paranoid! */ if ( !cmap->unsorted ) { /* Some fonts have more than 170 segments in their charmaps! */ /* We changed this function to use a more efficient binary */ /* search for improving performance */ FT_UInt min = 0; FT_UInt max = num_segs2 >> 1; FT_UInt mid, start, end, offset; while ( min < max ) { mid = ( min + max ) >> 1; p = table + 14 + mid * 2; end = TT_NEXT_USHORT( p ); p += num_segs2; start = TT_PEEK_USHORT( p); if ( code < start ) max = mid; else if ( code > end ) min = mid + 1; else { /* we found the segment */ idx = code; p += num_segs2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset == 0xFFFFU ) goto Exit; if ( offset != 0 ) { p += offset + 2 * ( idx - start ); idx = TT_PEEK_USHORT( p ); } if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; goto Exit; } } } else { FT_UInt n; FT_Byte* q; p = table + 14; /* ends table */ q = table + 16 + num_segs2; /* starts table */ for ( n = 0; n < num_segs2; n += 2 ) { FT_UInt end = TT_NEXT_USHORT( p ); FT_UInt start = TT_NEXT_USHORT( q ); FT_UInt offset; if ( code < start ) break; if ( code <= end ) { idx = code; p = q + num_segs2 - 2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset == 0xFFFFU ) goto Exit; if ( offset != 0 ) { p += offset + 2 * ( idx - start ); idx = TT_PEEK_USHORT( p ); } if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; } } } } Exit: return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap4_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt gindex = 0; FT_UInt32 char_code = *pchar_code; FT_Byte* p; FT_UInt code, num_segs2; if ( char_code >= 0xFFFFUL ) goto Exit; #ifdef OPT_CMAP4 { TT_CMap4 cmap4 = (TT_CMap4)cmap; if ( char_code == cmap4->old_charcode ) { result = cmap4->cur_charcode; gindex = cmap4->cur_gindex; if ( result != 0 ) { tt_cmap4_next( cmap4 ); goto Exit; } } } #endif /* OPT_CMAP4 */ code = (FT_UInt)char_code + 1; p = table + 6; num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 ); /* ensure even-ness */ if ( !cmap->unsorted ) { for (;;) { /* Some fonts have more than 170 segments in their charmaps! */ /* We changed this function to use a more efficient binary */ /* search */ FT_UInt offset; FT_Int delta; FT_UInt min = 0; FT_UInt max = num_segs2 >> 1; FT_UInt mid, start, end; FT_UInt hi; /* we begin by finding the segment which end is closer to our code point */ hi = max + 1; while ( min < max ) { mid = ( min + max ) >> 1; p = table + 14 + mid * 2; end = TT_PEEK_USHORT( p ); if ( end < code ) min = mid + 1; else { hi = mid; max = mid; } } if ( hi > max ) { /* the point is behind the last segment; we will exit right now */ goto Exit; } p = table + 14 + hi * 2; end = TT_PEEK_USHORT( p ); p += 2 + num_segs2; start = TT_PEEK_USHORT( p ); if ( code < start ) code = start; p += num_segs2; delta = TT_PEEK_USHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset != 0 && offset != 0xFFFFU ) { /* parse the glyph ids array for non-zero index */ p += offset + ( code - start ) * 2; while ( code <= end ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { gindex = (FT_UInt)( gindex + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = code; #ifdef OPT_CMAP4 tt_cmap4_reset( (TT_CMap4)cmap, code, hi ); #endif goto Exit; } } code++; } } else if ( offset == 0xFFFFU ) { /* an offset of 0xFFFF means an empty segment in certain fonts! */ code = end + 1; } else /* offset == 0 */ { gindex = (FT_UInt)( code + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = code; #ifdef OPT_CMAP4 tt_cmap4_reset( (TT_CMap4)cmap, code, hi ); #endif goto Exit; } code++; } } } else { for ( ;; ) { FT_UInt offset, n; FT_Int delta; FT_Byte* q; p = table + 14; /* ends table */ q = table + 16 + num_segs2; /* starts table */ for ( n = 0; n < num_segs2; n += 2 ) { FT_UInt end = TT_NEXT_USHORT( p ); FT_UInt start = TT_NEXT_USHORT( q ); if ( code < start ) code = start; if ( code <= end ) { p = q + num_segs2 - 2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset != 0 && offset != 0xFFFFU ) { /* parse the glyph ids array for non-0 index */ p += offset + ( code - start ) * 2; while ( code <= end ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { gindex = (FT_UInt)( gindex + delta ) & 0xFFFFU; if ( gindex != 0 ) break; } code++; } } else if ( offset == 0xFFFFU ) { /* an offset of 0xFFFF means an empty glyph in certain fonts! */ code = end; break; } else gindex = (FT_UInt)( code + delta ) & 0xFFFFU; if ( gindex == 0 ) break; result = code; goto Exit; } } /* loop to next trial charcode */ if ( code >= 0xFFFFU ) break; code++; } } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap4_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap4_class_rec = { { #ifdef OPT_CMAP4 sizeof ( TT_CMap4Rec ), (FT_CMap_InitFunc) tt_cmap4_init, #else sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, #endif (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap4_char_index, (FT_CMap_CharNextFunc) tt_cmap4_char_next }, 4, (TT_CMap_ValidateFunc) tt_cmap4_validate, (TT_CMap_Info_GetFunc) tt_cmap4_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_4 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 6 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 4 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* */ /* first 6 USHORT first segment code */ /* count 8 USHORT segment size in chars */ /* glyphIds 10 USHORT[count] glyph ids */ /* */ /* A very simplified segment mapping. */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_6 FT_CALLBACK_DEF( FT_Error ) tt_cmap6_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p; FT_UInt length, count; if ( table + 10 > valid->limit ) FT_INVALID_TOO_SHORT; p = table + 2; length = TT_NEXT_USHORT( p ); p = table + 8; /* skip language and start index */ count = TT_NEXT_USHORT( p ); if ( table + length > valid->limit || length < 10 + count * 2 ) FT_INVALID_TOO_SHORT; /* check glyph indices */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt gindex; for ( ; count > 0; count-- ) { gindex = TT_NEXT_USHORT( p ); if ( gindex >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } return SFNT_Err_Ok; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap6_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 6; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_UInt idx = (FT_UInt)( char_code - start ); if ( idx < count ) { p += 2 * idx; result = TT_PEEK_USHORT( p ); } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap6_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 6; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_UInt idx; if ( char_code >= 0x10000UL ) goto Exit; if ( char_code < start ) char_code = start; idx = (FT_UInt)( char_code - start ); p += 2 * idx; for ( ; idx < count; idx++ ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { result = char_code; break; } char_code++; } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap6_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap6_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap6_char_index, (FT_CMap_CharNextFunc) tt_cmap6_char_next }, 6, (TT_CMap_ValidateFunc) tt_cmap6_validate, (TT_CMap_Info_GetFunc) tt_cmap6_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_6 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 8 *****/ /***** *****/ /***** It's hard to completely understand what the OpenType spec *****/ /***** says about this format, but here is my conclusion. *****/ /***** *****/ /***** The purpose of this format is to easily map UTF-16 text to *****/ /***** glyph indices. Basically, the `char_code' must be in one of *****/ /***** the following formats: *****/ /***** *****/ /***** - A 16-bit value that isn't part of the Unicode Surrogates *****/ /***** Area (i.e. U+D800-U+DFFF). *****/ /***** *****/ /***** - A 32-bit value, made of two surrogate values, i.e.. if *****/ /***** `char_code = (char_hi << 16) | char_lo', then both *****/ /***** `char_hi' and `char_lo' must be in the Surrogates Area. *****/ /***** Area. *****/ /***** *****/ /***** The 'is32' table embedded in the charmap indicates whether a *****/ /***** given 16-bit value is in the surrogates area or not. *****/ /***** *****/ /***** So, for any given `char_code', we can assert the following: *****/ /***** *****/ /***** If `char_hi == 0' then we must have `is32[char_lo] == 0'. *****/ /***** *****/ /***** If `char_hi != 0' then we must have both *****/ /***** `is32[char_hi] != 0' and `is32[char_lo] != 0'. *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 8 */ /* reseved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* is32 12 BYTE[8192] 32-bitness bitmap */ /* count 8204 ULONG number of groups */ /* */ /* This header is followed by 'count' groups of the following format: */ /* */ /* start 0 ULONG first charcode */ /* end 4 ULONG last charcode */ /* startId 8 ULONG start glyph id for the group */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_8 FT_CALLBACK_DEF( FT_Error ) tt_cmap8_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 4; FT_Byte* is32; FT_UInt32 length; FT_UInt32 num_groups; if ( table + 16 + 8192 > valid->limit ) FT_INVALID_TOO_SHORT; length = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 8208 ) FT_INVALID_TOO_SHORT; is32 = table + 12; p = is32 + 8192; /* skip `is32' array */ num_groups = TT_NEXT_ULONG( p ); if ( p + num_groups * 12 > valid->limit ) FT_INVALID_TOO_SHORT; /* check groups, they must be in increasing order */ { FT_UInt32 n, start, end, start_id, count, last = 0; for ( n = 0; n < num_groups; n++ ) { FT_UInt hi, lo; start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( start > end ) FT_INVALID_DATA; if ( n > 0 && start <= last ) FT_INVALID_DATA; if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; count = (FT_UInt32)( end - start + 1 ); if ( start & ~0xFFFFU ) { /* start_hi != 0; check that is32[i] is 1 for each i in */ /* the `hi' and `lo' of the range [start..end] */ for ( ; count > 0; count--, start++ ) { hi = (FT_UInt)( start >> 16 ); lo = (FT_UInt)( start & 0xFFFFU ); if ( (is32[hi >> 3] & ( 0x80 >> ( hi & 7 ) ) ) == 0 ) FT_INVALID_DATA; if ( (is32[lo >> 3] & ( 0x80 >> ( lo & 7 ) ) ) == 0 ) FT_INVALID_DATA; } } else { /* start_hi == 0; check that is32[i] is 0 for each i in */ /* the range [start..end] */ /* end_hi cannot be != 0! */ if ( end & ~0xFFFFU ) FT_INVALID_DATA; for ( ; count > 0; count--, start++ ) { lo = (FT_UInt)( start & 0xFFFFU ); if ( (is32[lo >> 3] & ( 0x80 >> ( lo & 7 ) ) ) != 0 ) FT_INVALID_DATA; } } } last = end; } } return SFNT_Err_Ok; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap8_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 8204; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) break; if ( char_code <= end ) { result = (FT_UInt)( start_id + char_code - start ); break; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap8_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* table = cmap->data; FT_Byte* p = table + 8204; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; p = table + 8208; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) char_code = start; if ( char_code <= end ) { gindex = (FT_UInt)( char_code - start + start_id ); if ( gindex != 0 ) { result = char_code; goto Exit; } } } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap8_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap8_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap8_char_index, (FT_CMap_CharNextFunc) tt_cmap8_char_next }, 8, (TT_CMap_ValidateFunc) tt_cmap8_validate, (TT_CMap_Info_GetFunc) tt_cmap8_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_8 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 10 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 10 */ /* reserved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* */ /* start 12 ULONG first char in range */ /* count 16 ULONG number of chars in range */ /* glyphIds 20 USHORT[count] glyph indices covered */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_10 FT_CALLBACK_DEF( FT_Error ) tt_cmap10_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 4; FT_ULong length, count; if ( table + 20 > valid->limit ) FT_INVALID_TOO_SHORT; length = TT_NEXT_ULONG( p ); p = table + 16; count = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 20 + count * 2 ) FT_INVALID_TOO_SHORT; /* check glyph indices */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt gindex; for ( ; count > 0; count-- ) { gindex = TT_NEXT_USHORT( p ); if ( gindex >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } return SFNT_Err_Ok; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap10_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 12; FT_UInt32 start = TT_NEXT_ULONG( p ); FT_UInt32 count = TT_NEXT_ULONG( p ); FT_UInt32 idx = (FT_ULong)( char_code - start ); if ( idx < count ) { p += 2 * idx; result = TT_PEEK_USHORT( p ); } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap10_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 12; FT_UInt32 start = TT_NEXT_ULONG( p ); FT_UInt32 count = TT_NEXT_ULONG( p ); FT_UInt32 idx; if ( char_code < start ) char_code = start; idx = (FT_UInt32)( char_code - start ); p += 2 * idx; for ( ; idx < count; idx++ ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) break; char_code++; } *pchar_code = char_code; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap10_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap10_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap10_char_index, (FT_CMap_CharNextFunc) tt_cmap10_char_next }, 10, (TT_CMap_ValidateFunc) tt_cmap10_validate, (TT_CMap_Info_GetFunc) tt_cmap10_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_10 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 12 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 12 */ /* reserved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* count 12 ULONG number of groups */ /* 16 */ /* */ /* This header is followed by `count' groups of the following format: */ /* */ /* start 0 ULONG first charcode */ /* end 4 ULONG last charcode */ /* startId 8 ULONG start glyph id for the group */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_12 FT_CALLBACK_DEF( FT_Error ) tt_cmap12_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p; FT_ULong length; FT_ULong num_groups; if ( table + 16 > valid->limit ) FT_INVALID_TOO_SHORT; p = table + 4; length = TT_NEXT_ULONG( p ); p = table + 12; num_groups = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 16 + 12 * num_groups ) FT_INVALID_TOO_SHORT; /* check groups, they must be in increasing order */ { FT_ULong n, start, end, start_id, last = 0; for ( n = 0; n < num_groups; n++ ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( start > end ) FT_INVALID_DATA; if ( n > 0 && start <= last ) FT_INVALID_DATA; if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } last = end; } } return SFNT_Err_Ok; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap12_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_UInt result = 0; FT_Byte* table = cmap->data; FT_Byte* p = table + 12; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) break; if ( char_code <= end ) { result = (FT_UInt)( start_id + char_code - start ); break; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap12_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 12; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; p = table + 16; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) char_code = start; if ( char_code <= end ) { gindex = (FT_UInt)(char_code - start + start_id); if ( gindex != 0 ) { result = char_code; goto Exit; } } } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap12_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return SFNT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap12_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap12_char_index, (FT_CMap_CharNextFunc) tt_cmap12_char_next }, 12, (TT_CMap_ValidateFunc) tt_cmap12_validate, (TT_CMap_Info_GetFunc) tt_cmap12_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_12 */ static const TT_CMap_Class tt_cmap_classes[] = { #ifdef TT_CONFIG_CMAP_FORMAT_0 &tt_cmap0_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_2 &tt_cmap2_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_4 &tt_cmap4_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_6 &tt_cmap6_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_8 &tt_cmap8_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_10 &tt_cmap10_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_12 &tt_cmap12_class_rec, #endif NULL, }; /* parse the `cmap' table and build the corresponding TT_CMap objects */ /* in the current face */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_build_cmaps( TT_Face face ) { FT_Byte* table = face->cmap_table; FT_Byte* limit = table + face->cmap_size; FT_UInt volatile num_cmaps; FT_Byte* volatile p = table; if ( p + 4 > limit ) return SFNT_Err_Invalid_Table; /* only recognize format 0 */ if ( TT_NEXT_USHORT( p ) != 0 ) { p -= 2; FT_ERROR(( "tt_face_build_cmaps: unsupported `cmap' table format = %d\n", TT_PEEK_USHORT( p ) )); return SFNT_Err_Invalid_Table; } num_cmaps = TT_NEXT_USHORT( p ); for ( ; num_cmaps > 0 && p + 8 <= limit; num_cmaps-- ) { FT_CharMapRec charmap; FT_UInt32 offset; charmap.platform_id = TT_NEXT_USHORT( p ); charmap.encoding_id = TT_NEXT_USHORT( p ); charmap.face = FT_FACE( face ); charmap.encoding = FT_ENCODING_NONE; /* will be filled later */ offset = TT_NEXT_ULONG( p ); if ( offset && table + offset + 2 < limit && table + offset >= table ) { FT_Byte* cmap = table + offset; volatile FT_UInt format = TT_PEEK_USHORT( cmap ); const TT_CMap_Class* volatile pclazz = tt_cmap_classes; TT_CMap_Class clazz; for ( ; *pclazz; pclazz++ ) { clazz = *pclazz; if ( clazz->format == format ) { volatile TT_ValidatorRec valid; FT_Error error = SFNT_Err_Ok; ft_validator_init( FT_VALIDATOR( &valid ), cmap, limit, FT_VALIDATE_DEFAULT ); valid.num_glyphs = (FT_UInt)face->root.num_glyphs; if ( ft_setjmp( FT_VALIDATOR( &valid )->jump_buffer ) == 0 ) { /* validate this cmap sub-table */ error = clazz->validate( cmap, FT_VALIDATOR( &valid ) ); } if ( valid.validator.error == 0 ) { (void)FT_CMap_New( (FT_CMap_Class)clazz, cmap, &charmap, NULL ); /* it is simpler to directly set the `unsorted' flag instead */ /* of adding a parameter to FT_CMap_New */ ((TT_CMap)(face->root.charmaps [face->root.num_charmaps - 1]))->unsorted = FT_BOOL( error ); } else { FT_ERROR(( "tt_face_build_cmaps:" )); FT_ERROR(( " broken cmap sub-table ignored!\n" )); } break; } } } } return SFNT_Err_Ok; } FT_LOCAL( FT_Error ) tt_get_cmap_info( FT_CharMap charmap, TT_CMapInfo *cmap_info ) { FT_CMap cmap = (FT_CMap)charmap; TT_CMap_Class clazz = (TT_CMap_Class)cmap->clazz; return clazz->get_cmap_info( charmap, cmap_info ); } /* END */