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Diffstat (limited to 'nx-X11/extras/freetype2/src/sfnt/ttcmap0.c')
-rw-r--r--nx-X11/extras/freetype2/src/sfnt/ttcmap0.c1991
1 files changed, 1991 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/src/sfnt/ttcmap0.c b/nx-X11/extras/freetype2/src/sfnt/ttcmap0.c
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index 000000000..dd1c76aaa
--- /dev/null
+++ b/nx-X11/extras/freetype2/src/sfnt/ttcmap0.c
@@ -0,0 +1,1991 @@
+/***************************************************************************/
+/* */
+/* ttcmap0.c */
+/* */
+/* TrueType new character mapping table (cmap) support (body). */
+/* */
+/* Copyright 2002, 2003 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 FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_STREAM_H
+#include "ttload.h"
+#include "ttcmap0.h"
+
+#include "sferrors.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 0;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** 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( void )
+ 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;
+ }
+ }
+ }
+
+
+ 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 FT_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( void )
+ 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 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 FT_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
+
+ FT_CALLBACK_DEF( void )
+ 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;
+
+
+ /* 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 ( valid->level >= FT_VALIDATE_TIGHT )
+ {
+ if ( n > 0 && start <= last )
+ FT_INVALID_DATA;
+ }
+
+ 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;
+ }
+ }
+ }
+
+
+ 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 1
+ /* 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 /* 0 - old code */
+
+ {
+ 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;
+ }
+ }
+ }
+
+#endif /* 0 */
+
+ }
+
+ 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;
+
+ code = (FT_UInt)char_code + 1;
+ p = table + 6;
+ num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT(p), 2 ); /* ensure even-ness */
+
+#if 1
+
+ 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;
+ goto Exit;
+ }
+ }
+ code++;
+ }
+ }
+ else if ( offset == 0xFFFFU )
+ {
+ /* an offset of 0xFFFF means an empty glyph in certain fonts! */
+ code = end + 1;
+ }
+ else /* offset == 0 */
+ {
+ gindex = (FT_UInt)( code + delta ) & 0xFFFFU;
+ if ( gindex != 0 )
+ {
+ result = code;
+ goto Exit;
+ }
+ code++;
+ }
+ }
+
+#else /* old code -- kept for reference */
+
+ 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++;
+ }
+
+#endif /* !1 */
+
+ 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 FT_Err_Ok;
+ }
+
+
+ FT_CALLBACK_TABLE_DEF
+ const TT_CMap_ClassRec tt_cmap4_class_rec =
+ {
+ {
+ sizeof ( TT_CMapRec ),
+
+ (FT_CMap_InitFunc) tt_cmap_init,
+ (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( void )
+ 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;
+ }
+ }
+ }
+
+
+ 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 FT_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( void )
+ 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;
+ }
+ }
+ }
+
+
+ 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 FT_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( void )
+ 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;
+ }
+ }
+ }
+
+
+ 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 FT_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( void )
+ 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;
+ }
+ }
+ }
+
+
+ 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 FT_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 )
+ {
+ 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_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 */
+ clazz->validate( cmap, FT_VALIDATOR( &valid ) );
+ }
+
+ if ( valid.validator.error == 0 )
+ (void)FT_CMap_New( (FT_CMap_Class)clazz, cmap, &charmap, NULL );
+ else
+ {
+ FT_ERROR(( "tt_face_build_cmaps:" ));
+ FT_ERROR(( " broken cmap sub-table ignored!\n" ));
+ }
+ break;
+ }
+ }
+ }
+ }
+
+ return 0;
+ }
+
+
+ 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-12 05:26:56 +0000