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fuchsia / third_party / freetype2 / c9f588be56a6c89c210284711417130ea53bd72e / . / src / sfnt / ttcmap.c
blob: 556a712199f2357d3afc54f36cc570332acefdf4 [file] [log] [blame]
/****************************************************************************
*
* ttcmap.c
*
* TrueType character mapping table (cmap) support (body).
*
* Copyright (C) 2002-2020 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 <freetype/internal/ftdebug.h>
#include "sferrors.h" /* must come before `ftvalid.h' */
#include <freetype/internal/ftvalid.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/services/svpscmap.h>
#include "ttload.h"
#include "ttcmap.h"
#include "ttpost.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 ttcmap
#define TT_PEEK_SHORT FT_PEEK_SHORT
#define TT_PEEK_USHORT FT_PEEK_USHORT
#define TT_PEEK_UINT24 FT_PEEK_UOFF3
#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_UINT24 FT_NEXT_UOFF3
#define TT_NEXT_LONG FT_NEXT_LONG
#define TT_NEXT_ULONG FT_NEXT_ULONG
/* Too large glyph index return values are caught in `FT_Get_Char_Index' */
/* and `FT_Get_Next_Char' (the latter calls the internal `next' function */
/* again in this case). To mark character code return values as invalid */
/* it is sufficient to set the corresponding glyph index return value to */
/* zero. */
FT_CALLBACK_DEF( FT_Error )
tt_cmap_init( TT_CMap cmap,
FT_Byte* table )
{
cmap->data = table;
return FT_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;
FT_UInt length;
if ( table + 2 + 2 > valid->limit )
FT_INVALID_TOO_SHORT;
p = table + 2; /* skip format */
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 FT_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_UInt32 )
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->format = 0;
cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap0_class_rec,
sizeof ( TT_CMapRec ),
(FT_CMap_InitFunc) tt_cmap_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap0_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap0_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
0,
(TT_CMap_ValidateFunc)tt_cmap0_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap0_get_info /* get_cmap_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' fulfills the 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 precisely: *****/
/***** *****/
/***** (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 checks 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 is 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;
FT_UInt length;
FT_UInt n, max_subs;
FT_Byte* keys; /* keys table */
FT_Byte* subs; /* sub-headers */
FT_Byte* glyph_ids; /* glyph ID array */
if ( table + 2 + 2 > valid->limit )
FT_INVALID_TOO_SHORT;
p = table + 2; /* skip format */
length = TT_NEXT_USHORT( p );
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;
first_code = TT_NEXT_USHORT( p );
code_count = TT_NEXT_USHORT( p );
delta = TT_NEXT_SHORT( p );
offset = TT_NEXT_USHORT( p );
/* many Dynalab fonts have empty sub-headers */
if ( code_count == 0 )
continue;
/* check range within 0..255 */
if ( valid->level >= FT_VALIDATE_PARANOID )
{
if ( first_code >= 256 || code_count > 256 - first_code )
FT_INVALID_DATA;
}
/* check offset */
if ( offset != 0 )
{
FT_Byte* ids;
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 = (FT_UInt)( (FT_Int)idx + delta ) & 0xFFFFU;
if ( idx >= TT_VALID_GLYPH_COUNT( valid ) )
FT_INVALID_GLYPH_ID;
}
}
}
}
}
return FT_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 is 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)( (FT_Int)idx + delta ) & 0xFFFFU;
}
}
return result;
}
FT_CALLBACK_DEF( FT_UInt32 )
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 ( char_lo >= start + count && charcode <= 0xFF )
{
/* this happens only for a malformed cmap */
charcode = 0x100;
continue;
}
if ( offset == 0 )
{
if ( charcode == 0x100 )
goto Exit; /* this happens only for a malformed cmap */
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 = (FT_UInt)( (FT_Int)idx + delta ) & 0xFFFFU;
if ( gindex != 0 )
{
result = charcode;
goto Exit;
}
}
}
/* if unsuccessful, avoid `charcode' leaving */
/* the current 256-character block */
if ( count )
charcode--;
}
/* If `charcode' is <= 0xFF, retry with `charcode + 1'. */
/* Otherwise jump to the next 256-character block and retry. */
Next_SubHeader:
if ( charcode <= 0xFF )
charcode++;
else
charcode = FT_PAD_FLOOR( charcode, 0x100 ) + 0x100;
}
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->format = 2;
cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap2_class_rec,
sizeof ( TT_CMapRec ),
(FT_CMap_InitFunc) tt_cmap_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap2_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap2_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
2,
(TT_CMap_ValidateFunc)tt_cmap2_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap2_get_info /* get_cmap_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 overlap, and the last segment should always contain the value
* 0xFFFF for `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 a lot of fonts contain an invalid last segment,
* where `start' and `end' are correctly set to 0xFFFF but both `delta'
* and `offset' are incorrect (e.g., `opens___.ttf' which comes with
* OpenOffice.org). We need special code to deal with them correctly.
*/
#ifdef TT_CONFIG_CMAP_FORMAT_4
typedef struct TT_CMap4Rec_
{
TT_CMapRec cmap;
FT_UInt32 cur_charcode; /* current charcode */
FT_UInt cur_gindex; /* current glyph index */
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 + 6;
cmap->num_ranges = FT_PEEK_USHORT( p ) >> 1;
cmap->cur_charcode = (FT_UInt32)0xFFFFFFFFUL;
cmap->cur_gindex = 0;
return FT_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 );
/* some fonts have an incorrect last segment; */
/* we have to catch it */
if ( range_index >= num_ranges - 1 &&
cmap->cur_start == 0xFFFFU &&
cmap->cur_end == 0xFFFFU )
{
TT_Face face = (TT_Face)cmap->cmap.cmap.charmap.face;
FT_Byte* limit = face->cmap_table + face->cmap_size;
if ( offset && p + offset + 2 > limit )
{
cmap->cur_delta = 1;
offset = 0;
}
}
if ( offset != 0xFFFFU )
{
cmap->cur_values = offset ? p + offset : NULL;
cmap->cur_range = range_index;
return 0;
}
/* we skip empty segments */
range_index++;
}
return -1;
}
/* search the index of the charcode next to cmap->cur_charcode; */
/* caller should call tt_cmap4_set_range with proper range */
/* before calling this function */
/* */
static void
tt_cmap4_next( TT_CMap4 cmap )
{
TT_Face face = (TT_Face)cmap->cmap.cmap.charmap.face;
FT_Byte* limit = face->cmap_table + face->cmap_size;
FT_UInt charcode;
if ( cmap->cur_charcode >= 0xFFFFUL )
goto Fail;
charcode = (FT_UInt)cmap->cur_charcode + 1;
if ( charcode < cmap->cur_start )
charcode = cmap->cur_start;
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 );
/* if p > limit, the whole segment is invalid */
if ( p > limit )
goto Next_Segment;
do
{
FT_UInt gindex = FT_NEXT_USHORT( p );
if ( gindex )
{
gindex = (FT_UInt)( (FT_Int)gindex + delta ) & 0xFFFFU;
if ( gindex )
{
cmap->cur_charcode = charcode;
cmap->cur_gindex = gindex;
return;
}
}
} while ( ++charcode <= end );
}
else
{
do
{
FT_UInt gindex = (FT_UInt)( (FT_Int)charcode + delta ) & 0xFFFFU;
if ( gindex >= (FT_UInt)face->root.num_glyphs )
{
/* we have an invalid glyph index; if there is an overflow, */
/* we can adjust `charcode', otherwise the whole segment is */
/* invalid */
gindex = 0;
if ( (FT_Int)charcode + delta < 0 &&
(FT_Int)end + delta >= 0 )
charcode = (FT_UInt)( -delta );
else if ( (FT_Int)charcode + delta < 0x10000L &&
(FT_Int)end + delta >= 0x10000L )
charcode = (FT_UInt)( 0x10000L - delta );
else
goto Next_Segment;
}
if ( gindex )
{
cmap->cur_charcode = charcode;
cmap->cur_gindex = gindex;
return;
}
} while ( ++charcode <= end );
}
}
Next_Segment:
/* we need to find another range */
if ( tt_cmap4_set_range( cmap, cmap->cur_range + 1 ) < 0 )
break;
if ( charcode < cmap->cur_start )
charcode = cmap->cur_start;
}
Fail:
cmap->cur_charcode = (FT_UInt32)0xFFFFFFFFUL;
cmap->cur_gindex = 0;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap4_validate( FT_Byte* table,
FT_Validator valid )
{
FT_Byte* p;
FT_UInt length;
FT_Byte *ends, *starts, *offsets, *deltas, *glyph_ids;
FT_UInt num_segs;
FT_Error error = FT_Err_Ok;
if ( table + 2 + 2 > valid->limit )
FT_INVALID_TOO_SHORT;
p = table + 2; /* skip format */
length = TT_NEXT_USHORT( p );
/* in certain fonts, the `length' field is invalid and goes */
/* out of bound. We try to correct this here... */
if ( table + length > valid->limit )
{
if ( valid->level >= FT_VALIDATE_TIGHT )
FT_INVALID_TOO_SHORT;
length = (FT_UInt)( valid->limit - table );
}
if ( length < 16 )
FT_INVALID_TOO_SHORT;
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;
if ( length < 16 + num_segs * 2 * 4 )
FT_INVALID_TOO_SHORT;
/* 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;
/* check last segment; its end count value must be 0xFFFF */
if ( valid->level >= FT_VALIDATE_PARANOID )
{
p = ends + ( num_segs - 1 ) * 2;
if ( TT_PEEK_USHORT( p ) != 0xFFFFU )
FT_INVALID_DATA;
}
{
FT_UInt start, end, offset, n;
FT_UInt last_start = 0, last_end = 0;
FT_Int delta;
FT_Byte* p_start = starts;
FT_Byte* p_end = ends;
FT_Byte* p_delta = deltas;
FT_Byte* p_offset = offsets;
for ( n = 0; n < num_segs; n++ )
{
p = p_offset;
start = TT_NEXT_USHORT( p_start );
end = TT_NEXT_USHORT( p_end );
delta = TT_NEXT_SHORT( p_delta );
offset = TT_NEXT_USHORT( p_offset );
if ( start > end )
FT_INVALID_DATA;
/* this test should be performed at default validation level; */
/* unfortunately, some popular Asian fonts have overlapping */
/* ranges in their charmaps */
/* */
if ( start <= last_end && n > 0 )
{
if ( valid->level >= FT_VALIDATE_TIGHT )
FT_INVALID_DATA;
else
{
/* allow overlapping segments, provided their start points */
/* and end points, respectively, are in ascending order */
/* */
if ( last_start > start || last_end > end )
error |= TT_CMAP_FLAG_UNSORTED;
else
error |= TT_CMAP_FLAG_OVERLAPPING;
}
}
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;
}
/* Some fonts handle the last segment incorrectly. In */
/* theory, 0xFFFF might point to an ordinary glyph -- */
/* a cmap 4 is versatile and could be used for any */
/* encoding, not only Unicode. However, reality shows */
/* that far too many fonts are sloppy and incorrectly */
/* set all fields but `start' and `end' for the last */
/* segment if it contains only a single character. */
/* */
/* We thus omit the test here, delaying it to the */
/* routines that actually access the cmap. */
else if ( n != num_segs - 1 ||
!( start == 0xFFFFU && end == 0xFFFFU ) )
{
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)( (FT_Int)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 ) )
FT_INVALID_DATA;
}
last_start = start;
last_end = end;
}
}
return error;
}
static FT_UInt
tt_cmap4_char_map_linear( TT_CMap cmap,
FT_UInt32* pcharcode,
FT_Bool next )
{
TT_Face face = (TT_Face)cmap->cmap.charmap.face;
FT_Byte* limit = face->cmap_table + face->cmap_size;
FT_UInt num_segs2, start, end, offset;
FT_Int delta;
FT_UInt i, num_segs;
FT_UInt32 charcode = *pcharcode;
FT_UInt gindex = 0;
FT_Byte* p;
FT_Byte* q;
p = cmap->data + 6;
num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 );
num_segs = num_segs2 >> 1;
if ( !num_segs )
return 0;
if ( next )
charcode++;
if ( charcode > 0xFFFFU )
return 0;
/* linear search */
p = cmap->data + 14; /* ends table */
q = cmap->data + 16 + num_segs2; /* starts table */
for ( i = 0; i < num_segs; i++ )
{
end = TT_NEXT_USHORT( p );
start = TT_NEXT_USHORT( q );
if ( charcode < start )
{
if ( next )
charcode = start;
else
break;
}
Again:
if ( charcode <= end )
{
FT_Byte* r;
r = q - 2 + num_segs2;
delta = TT_PEEK_SHORT( r );
r += num_segs2;
offset = TT_PEEK_USHORT( r );
/* some fonts have an incorrect last segment; */
/* we have to catch it */
if ( i >= num_segs - 1 &&
start == 0xFFFFU && end == 0xFFFFU )
{
if ( offset && r + offset + 2 > limit )
{
delta = 1;
offset = 0;
}
}
if ( offset == 0xFFFFU )
continue;
if ( offset )
{
r += offset + ( charcode - start ) * 2;
/* if r > limit, the whole segment is invalid */
if ( next && r > limit )
continue;
gindex = TT_PEEK_USHORT( r );
if ( gindex )
{
gindex = (FT_UInt)( (FT_Int)gindex + delta ) & 0xFFFFU;
if ( gindex >= (FT_UInt)face->root.num_glyphs )
gindex = 0;
}
}
else
{
gindex = (FT_UInt)( (FT_Int)charcode + delta ) & 0xFFFFU;
if ( next && gindex >= (FT_UInt)face->root.num_glyphs )
{
/* we have an invalid glyph index; if there is an overflow, */
/* we can adjust `charcode', otherwise the whole segment is */
/* invalid */
gindex = 0;
if ( (FT_Int)charcode + delta < 0 &&
(FT_Int)end + delta >= 0 )
charcode = (FT_UInt)( -delta );
else if ( (FT_Int)charcode + delta < 0x10000L &&
(FT_Int)end + delta >= 0x10000L )
charcode = (FT_UInt)( 0x10000L - delta );
else
continue;
}
}
if ( next && !gindex )
{
if ( charcode >= 0xFFFFU )
break;
charcode++;
goto Again;
}
break;
}
}
if ( next )
*pcharcode = charcode;
return gindex;
}
static FT_UInt
tt_cmap4_char_map_binary( TT_CMap cmap,
FT_UInt32* pcharcode,
FT_Bool next )
{
TT_Face face = (TT_Face)cmap->cmap.charmap.face;
FT_Byte* limit = face->cmap_table + face->cmap_size;
FT_UInt num_segs2, start, end, offset;
FT_Int delta;
FT_UInt max, min, mid, num_segs;
FT_UInt charcode = (FT_UInt)*pcharcode;
FT_UInt gindex = 0;
FT_Byte* p;
p = cmap->data + 6;
num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 );
if ( !num_segs2 )
return 0;
num_segs = num_segs2 >> 1;
/* make compiler happy */
mid = num_segs;
end = 0xFFFFU;
if ( next )
charcode++;
min = 0;
max = num_segs;
/* binary search */
while ( min < max )
{
mid = ( min + max ) >> 1;
p = cmap->data + 14 + mid * 2;
end = TT_PEEK_USHORT( p );
p += 2 + num_segs2;
start = TT_PEEK_USHORT( p );
if ( charcode < start )
max = mid;
else if ( charcode > end )
min = mid + 1;
else
{
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
/* some fonts have an incorrect last segment; */
/* we have to catch it */
if ( mid >= num_segs - 1 &&
start == 0xFFFFU && end == 0xFFFFU )
{
if ( offset && p + offset + 2 > limit )
{
delta = 1;
offset = 0;
}
}
/* search the first segment containing `charcode' */
if ( cmap->flags & TT_CMAP_FLAG_OVERLAPPING )
{
FT_UInt i;
/* call the current segment `max' */
max = mid;
if ( offset == 0xFFFFU )
mid = max + 1;
/* search in segments before the current segment */
for ( i = max; i > 0; i-- )
{
FT_UInt prev_end;
FT_Byte* old_p;
old_p = p;
p = cmap->data + 14 + ( i - 1 ) * 2;
prev_end = TT_PEEK_USHORT( p );
if ( charcode > prev_end )
{
p = old_p;
break;
}
end = prev_end;
p += 2 + num_segs2;
start = TT_PEEK_USHORT( p );
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
if ( offset != 0xFFFFU )
mid = i - 1;
}
/* no luck */
if ( mid == max + 1 )
{
if ( i != max )
{
p = cmap->data + 14 + max * 2;
end = TT_PEEK_USHORT( p );
p += 2 + num_segs2;
start = TT_PEEK_USHORT( p );
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
}
mid = max;
/* search in segments after the current segment */
for ( i = max + 1; i < num_segs; i++ )
{
FT_UInt next_end, next_start;
p = cmap->data + 14 + i * 2;
next_end = TT_PEEK_USHORT( p );
p += 2 + num_segs2;
next_start = TT_PEEK_USHORT( p );
if ( charcode < next_start )
break;
end = next_end;
start = next_start;
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
if ( offset != 0xFFFFU )
mid = i;
}
i--;
/* still no luck */
if ( mid == max )
{
mid = i;
break;
}
}
/* end, start, delta, and offset are for the i'th segment */
if ( mid != i )
{
p = cmap->data + 14 + mid * 2;
end = TT_PEEK_USHORT( p );
p += 2 + num_segs2;
start = TT_PEEK_USHORT( p );
p += num_segs2;
delta = TT_PEEK_SHORT( p );
p += num_segs2;
offset = TT_PEEK_USHORT( p );
}
}
else
{
if ( offset == 0xFFFFU )
break;
}
if ( offset )
{
p += offset + ( charcode - start ) * 2;
/* if p > limit, the whole segment is invalid */
if ( next && p > limit )
break;
gindex = TT_PEEK_USHORT( p );
if ( gindex )
{
gindex = (FT_UInt)( (FT_Int)gindex + delta ) & 0xFFFFU;
if ( gindex >= (FT_UInt)face->root.num_glyphs )
gindex = 0;
}
}
else
{
gindex = (FT_UInt)( (FT_Int)charcode + delta ) & 0xFFFFU;
if ( next && gindex >= (FT_UInt)face->root.num_glyphs )
{
/* we have an invalid glyph index; if there is an overflow, */
/* we can adjust `charcode', otherwise the whole segment is */
/* invalid */
gindex = 0;
if ( (FT_Int)charcode + delta < 0 &&
(FT_Int)end + delta >= 0 )
charcode = (FT_UInt)( -delta );
else if ( (FT_Int)charcode + delta < 0x10000L &&
(FT_Int)end + delta >= 0x10000L )
charcode = (FT_UInt)( 0x10000L - delta );
}
}
break;
}
}
if ( next )
{
TT_CMap4 cmap4 = (TT_CMap4)cmap;
/* if `charcode' is not in any segment, then `mid' is */
/* the segment nearest to `charcode' */
if ( charcode > end )
{
mid++;
if ( mid == num_segs )
return 0;
}
if ( tt_cmap4_set_range( cmap4, mid ) )
{
if ( gindex )
*pcharcode = charcode;
}
else
{
cmap4->cur_charcode = charcode;
if ( gindex )
cmap4->cur_gindex = gindex;
else
{
cmap4->cur_charcode = charcode;
tt_cmap4_next( cmap4 );
gindex = cmap4->cur_gindex;
}
if ( gindex )
*pcharcode = cmap4->cur_charcode;
}
}
return gindex;
}
FT_CALLBACK_DEF( FT_UInt )
tt_cmap4_char_index( TT_CMap cmap,
FT_UInt32 char_code )
{
if ( char_code >= 0x10000UL )
return 0;
if ( cmap->flags & TT_CMAP_FLAG_UNSORTED )
return tt_cmap4_char_map_linear( cmap, &char_code, 0 );
else
return tt_cmap4_char_map_binary( cmap, &char_code, 0 );
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap4_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_UInt gindex;
if ( *pchar_code >= 0xFFFFU )
return 0;
if ( cmap->flags & TT_CMAP_FLAG_UNSORTED )
gindex = tt_cmap4_char_map_linear( cmap, pchar_code, 1 );
else
{
TT_CMap4 cmap4 = (TT_CMap4)cmap;
/* no need to search */
if ( *pchar_code == cmap4->cur_charcode )
{
tt_cmap4_next( cmap4 );
gindex = cmap4->cur_gindex;
if ( gindex )
*pchar_code = cmap4->cur_charcode;
}
else
gindex = tt_cmap4_char_map_binary( cmap, pchar_code, 1 );
}
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->format = 4;
cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap4_class_rec,
sizeof ( TT_CMap4Rec ),
(FT_CMap_InitFunc) tt_cmap4_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap4_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap4_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
4,
(TT_CMap_ValidateFunc)tt_cmap4_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap4_get_info /* get_cmap_info */
)
#endif /* TT_CONFIG_CMAP_FORMAT_4 */
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FORMAT 6 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* TABLE OVERVIEW
* --------------
*
* NAME OFFSET TYPE DESCRIPTION
*
* format 0 USHORT must be 6
* 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 FT_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_UInt32 )
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 )
return 0;
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;
}
if ( char_code >= 0xFFFFU )
return 0;
char_code++;
}
*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->format = 6;
cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap6_class_rec,
sizeof ( TT_CMapRec ),
(FT_CMap_InitFunc) tt_cmap_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap6_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap6_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
6,
(TT_CMap_ValidateFunc)tt_cmap6_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap6_get_info /* get_cmap_info */
)
#endif /* TT_CONFIG_CMAP_FORMAT_6 */
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FORMAT 8 *****/
/***** *****/
/***** It is 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
* reserved 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 ( length > (FT_UInt32)( valid->limit - table ) || length < 8192 + 16 )
FT_INVALID_TOO_SHORT;
is32 = table + 12;
p = is32 + 8192; /* skip `is32' array */
num_groups = TT_NEXT_ULONG( p );
/* p + num_groups * 12 > valid->limit ? */
if ( num_groups > (FT_UInt32)( valid->limit - p ) / 12 )
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 )
{
FT_UInt32 d = end - start;
/* start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ? */
if ( d > TT_VALID_GLYPH_COUNT( valid ) ||
start_id >= TT_VALID_GLYPH_COUNT( valid ) - d )
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 FT_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 )
{
if ( start_id > 0xFFFFFFFFUL - ( char_code - start ) )
return 0;
result = (FT_UInt)( start_id + ( char_code - start ) );
break;
}
}
return result;
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap8_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_Face face = cmap->cmap.charmap.face;
FT_UInt32 result = 0;
FT_UInt32 char_code;
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;
if ( *pchar_code >= 0xFFFFFFFFUL )
return 0;
char_code = *pchar_code + 1;
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;
Again:
if ( char_code <= end )
{
/* ignore invalid group */
if ( start_id > 0xFFFFFFFFUL - ( char_code - start ) )
continue;
gindex = (FT_UInt)( start_id + ( char_code - start ) );
/* does first element of group point to `.notdef' glyph? */
if ( gindex == 0 )
{
if ( char_code >= 0xFFFFFFFFUL )
break;
char_code++;
goto Again;
}
/* if `gindex' is invalid, the remaining values */
/* in this group are invalid, too */
if ( gindex >= (FT_UInt)face->num_glyphs )
{
gindex = 0;
continue;
}
result = char_code;
break;
}
}
*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->format = 8;
cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap8_class_rec,
sizeof ( TT_CMapRec ),
(FT_CMap_InitFunc) tt_cmap_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap8_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap8_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
8,
(TT_CMap_ValidateFunc)tt_cmap8_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap8_get_info /* get_cmap_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 ( length > (FT_ULong)( valid->limit - table ) ||
/* length < 20 + count * 2 ? */
length < 20 ||
( length - 20 ) / 2 < count )
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 FT_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;
if ( char_code < start )
return 0;
idx = char_code - start;
if ( idx < count )
{
p += 2 * idx;
result = TT_PEEK_USHORT( p );
}
return result;
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap10_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_Byte* table = cmap->data;
FT_UInt32 char_code;
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 ( *pchar_code >= 0xFFFFFFFFUL )
return 0;
char_code = *pchar_code + 1;
if ( char_code < start )
char_code = start;
idx = char_code - start;
p += 2 * idx;
for ( ; idx < count; idx++ )
{
gindex = TT_NEXT_USHORT( p );
if ( gindex != 0 )
break;
if ( char_code >= 0xFFFFFFFFUL )
return 0;
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->format = 10;
cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap10_class_rec,
sizeof ( TT_CMapRec ),
(FT_CMap_InitFunc) tt_cmap_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap10_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap10_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
10,
(TT_CMap_ValidateFunc)tt_cmap10_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap10_get_info /* get_cmap_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
typedef struct TT_CMap12Rec_
{
TT_CMapRec cmap;
FT_Bool valid;
FT_ULong cur_charcode;
FT_UInt cur_gindex;
FT_ULong cur_group;
FT_ULong num_groups;
} TT_CMap12Rec, *TT_CMap12;
FT_CALLBACK_DEF( FT_Error )
tt_cmap12_init( TT_CMap12 cmap,
FT_Byte* table )
{
cmap->cmap.data = table;
table += 12;
cmap->num_groups = FT_PEEK_ULONG( table );
cmap->valid = 0;
return FT_Err_Ok;
}
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 ( length > (FT_ULong)( valid->limit - table ) ||
/* length < 16 + 12 * num_groups ? */
length < 16 ||
( 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 )
{
FT_UInt32 d = end - start;
/* start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ? */
if ( d > TT_VALID_GLYPH_COUNT( valid ) ||
start_id >= TT_VALID_GLYPH_COUNT( valid ) - d )
FT_INVALID_GLYPH_ID;
}
last = end;
}
}
return FT_Err_Ok;
}
/* search the index of the charcode next to cmap->cur_charcode */
/* cmap->cur_group should be set up properly by caller */
/* */
static void
tt_cmap12_next( TT_CMap12 cmap )
{
FT_Face face = cmap->cmap.cmap.charmap.face;
FT_Byte* p;
FT_ULong start, end, start_id, char_code;
FT_ULong n;
FT_UInt gindex;
if ( cmap->cur_charcode >= 0xFFFFFFFFUL )
goto Fail;
char_code = cmap->cur_charcode + 1;
for ( n = cmap->cur_group; n < cmap->num_groups; n++ )
{
p = cmap->cmap.data + 16 + 12 * n;
start = TT_NEXT_ULONG( p );
end = TT_NEXT_ULONG( p );
start_id = TT_PEEK_ULONG( p );
if ( char_code < start )
char_code = start;
Again:
if ( char_code <= end )
{
/* ignore invalid group */
if ( start_id > 0xFFFFFFFFUL - ( char_code - start ) )
continue;
gindex = (FT_UInt)( start_id + ( char_code - start ) );
/* does first element of group point to `.notdef' glyph? */
if ( gindex == 0 )
{
if ( char_code >= 0xFFFFFFFFUL )
goto Fail;
char_code++;
goto Again;
}
/* if `gindex' is invalid, the remaining values */
/* in this group are invalid, too */
if ( gindex >= (FT_UInt)face->num_glyphs )
continue;
cmap->cur_charcode = char_code;
cmap->cur_gindex = gindex;
cmap->cur_group = n;
return;
}
}
Fail:
cmap->valid = 0;
}
static FT_UInt
tt_cmap12_char_map_binary( TT_CMap cmap,
FT_UInt32* pchar_code,
FT_Bool next )
{
FT_UInt gindex = 0;
FT_Byte* p = cmap->data + 12;
FT_UInt32 num_groups = TT_PEEK_ULONG( p );
FT_UInt32 char_code = *pchar_code;
FT_UInt32 start, end, start_id;
FT_UInt32 max, min, mid;
if ( !num_groups )
return 0;
/* make compiler happy */
mid = num_groups;
end = 0xFFFFFFFFUL;
if ( next )
{
if ( char_code >= 0xFFFFFFFFUL )
return 0;
char_code++;
}
min = 0;
max = num_groups;
/* binary search */
while ( min < max )
{
mid = ( min + max ) >> 1;
p = cmap->data + 16 + 12 * mid;
start = TT_NEXT_ULONG( p );
end = TT_NEXT_ULONG( p );
if ( char_code < start )
max = mid;
else if ( char_code > end )
min = mid + 1;
else
{
start_id = TT_PEEK_ULONG( p );
/* reject invalid glyph index */
if ( start_id > 0xFFFFFFFFUL - ( char_code - start ) )
gindex = 0;
else
gindex = (FT_UInt)( start_id + ( char_code - start ) );
break;
}
}
if ( next )
{
FT_Face face = cmap->cmap.charmap.face;
TT_CMap12 cmap12 = (TT_CMap12)cmap;
/* if `char_code' is not in any group, then `mid' is */
/* the group nearest to `char_code' */
if ( char_code > end )
{
mid++;
if ( mid == num_groups )
return 0;
}
cmap12->valid = 1;
cmap12->cur_charcode = char_code;
cmap12->cur_group = mid;
if ( gindex >= (FT_UInt)face->num_glyphs )
gindex = 0;
if ( !gindex )
{
tt_cmap12_next( cmap12 );
if ( cmap12->valid )
gindex = cmap12->cur_gindex;
}
else
cmap12->cur_gindex = gindex;
*pchar_code = cmap12->cur_charcode;
}
return gindex;
}
FT_CALLBACK_DEF( FT_UInt )
tt_cmap12_char_index( TT_CMap cmap,
FT_UInt32 char_code )
{
return tt_cmap12_char_map_binary( cmap, &char_code, 0 );
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap12_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
TT_CMap12 cmap12 = (TT_CMap12)cmap;
FT_UInt gindex;
/* no need to search */
if ( cmap12->valid && cmap12->cur_charcode == *pchar_code )
{
tt_cmap12_next( cmap12 );
if ( cmap12->valid )
{
gindex = cmap12->cur_gindex;
*pchar_code = (FT_UInt32)cmap12->cur_charcode;
}
else
gindex = 0;
}
else
gindex = tt_cmap12_char_map_binary( cmap, pchar_code, 1 );
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->format = 12;
cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap12_class_rec,
sizeof ( TT_CMap12Rec ),
(FT_CMap_InitFunc) tt_cmap12_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap12_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap12_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
12,
(TT_CMap_ValidateFunc)tt_cmap12_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap12_get_info /* get_cmap_info */
)
#endif /* TT_CONFIG_CMAP_FORMAT_12 */
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FORMAT 13 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* TABLE OVERVIEW
* --------------
*
* NAME OFFSET TYPE DESCRIPTION
*
* format 0 USHORT must be 13
* 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
* glyphId 8 ULONG glyph ID for the whole group
*/
#ifdef TT_CONFIG_CMAP_FORMAT_13
typedef struct TT_CMap13Rec_
{
TT_CMapRec cmap;
FT_Bool valid;
FT_ULong cur_charcode;
FT_UInt cur_gindex;
FT_ULong cur_group;
FT_ULong num_groups;
} TT_CMap13Rec, *TT_CMap13;
FT_CALLBACK_DEF( FT_Error )
tt_cmap13_init( TT_CMap13 cmap,
FT_Byte* table )
{
cmap->cmap.data = table;
table += 12;
cmap->num_groups = FT_PEEK_ULONG( table );
cmap->valid = 0;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap13_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 ( length > (FT_ULong)( valid->limit - table ) ||
/* length < 16 + 12 * num_groups ? */
length < 16 ||
( length - 16 ) / 12 < num_groups )
FT_INVALID_TOO_SHORT;
/* check groups, they must be in increasing order */
{
FT_ULong n, start, end, glyph_id, last = 0;
for ( n = 0; n < num_groups; n++ )
{
start = TT_NEXT_ULONG( p );
end = TT_NEXT_ULONG( p );
glyph_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 ( glyph_id >= TT_VALID_GLYPH_COUNT( valid ) )
FT_INVALID_GLYPH_ID;
}
last = end;
}
}
return FT_Err_Ok;
}
/* search the index of the charcode next to cmap->cur_charcode */
/* cmap->cur_group should be set up properly by caller */
/* */
static void
tt_cmap13_next( TT_CMap13 cmap )
{
FT_Face face = cmap->cmap.cmap.charmap.face;
FT_Byte* p;
FT_ULong start, end, glyph_id, char_code;
FT_ULong n;
FT_UInt gindex;
if ( cmap->cur_charcode >= 0xFFFFFFFFUL )
goto Fail;
char_code = cmap->cur_charcode + 1;
for ( n = cmap->cur_group; n < cmap->num_groups; n++ )
{
p = cmap->cmap.data + 16 + 12 * n;
start = TT_NEXT_ULONG( p );
end = TT_NEXT_ULONG( p );
glyph_id = TT_PEEK_ULONG( p );
if ( char_code < start )
char_code = start;
if ( char_code <= end )
{
gindex = (FT_UInt)glyph_id;
if ( gindex && gindex < (FT_UInt)face->num_glyphs )
{
cmap->cur_charcode = char_code;
cmap->cur_gindex = gindex;
cmap->cur_group = n;
return;
}
}
}
Fail:
cmap->valid = 0;
}
static FT_UInt
tt_cmap13_char_map_binary( TT_CMap cmap,
FT_UInt32* pchar_code,
FT_Bool next )
{
FT_UInt gindex = 0;
FT_Byte* p = cmap->data + 12;
FT_UInt32 num_groups = TT_PEEK_ULONG( p );
FT_UInt32 char_code = *pchar_code;
FT_UInt32 start, end;
FT_UInt32 max, min, mid;
if ( !num_groups )
return 0;
/* make compiler happy */
mid = num_groups;
end = 0xFFFFFFFFUL;
if ( next )
{
if ( char_code >= 0xFFFFFFFFUL )
return 0;
char_code++;
}
min = 0;
max = num_groups;
/* binary search */
while ( min < max )
{
mid = ( min + max ) >> 1;
p = cmap->data + 16 + 12 * mid;
start = TT_NEXT_ULONG( p );
end = TT_NEXT_ULONG( p );
if ( char_code < start )
max = mid;
else if ( char_code > end )
min = mid + 1;
else
{
gindex = (FT_UInt)TT_PEEK_ULONG( p );
break;
}
}
if ( next )
{
FT_Face face = cmap->cmap.charmap.face;
TT_CMap13 cmap13 = (TT_CMap13)cmap;
/* if `char_code' is not in any group, then `mid' is */
/* the group nearest to `char_code' */
if ( char_code > end )
{
mid++;
if ( mid == num_groups )
return 0;
}
cmap13->valid = 1;
cmap13->cur_charcode = char_code;
cmap13->cur_group = mid;
if ( gindex >= (FT_UInt)face->num_glyphs )
gindex = 0;
if ( !gindex )
{
tt_cmap13_next( cmap13 );
if ( cmap13->valid )
gindex = cmap13->cur_gindex;
}
else
cmap13->cur_gindex = gindex;
*pchar_code = cmap13->cur_charcode;
}
return gindex;
}
FT_CALLBACK_DEF( FT_UInt )
tt_cmap13_char_index( TT_CMap cmap,
FT_UInt32 char_code )
{
return tt_cmap13_char_map_binary( cmap, &char_code, 0 );
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap13_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
TT_CMap13 cmap13 = (TT_CMap13)cmap;
FT_UInt gindex;
/* no need to search */
if ( cmap13->valid && cmap13->cur_charcode == *pchar_code )
{
tt_cmap13_next( cmap13 );
if ( cmap13->valid )
{
gindex = cmap13->cur_gindex;
*pchar_code = cmap13->cur_charcode;
}
else
gindex = 0;
}
else
gindex = tt_cmap13_char_map_binary( cmap, pchar_code, 1 );
return gindex;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap13_get_info( TT_CMap cmap,
TT_CMapInfo *cmap_info )
{
FT_Byte* p = cmap->data + 8;
cmap_info->format = 13;
cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );
return FT_Err_Ok;
}
FT_DEFINE_TT_CMAP(
tt_cmap13_class_rec,
sizeof ( TT_CMap13Rec ),
(FT_CMap_InitFunc) tt_cmap13_init, /* init */
(FT_CMap_DoneFunc) NULL, /* done */
(FT_CMap_CharIndexFunc)tt_cmap13_char_index, /* char_index */
(FT_CMap_CharNextFunc) tt_cmap13_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL, /* variantchar_list */
13,
(TT_CMap_ValidateFunc)tt_cmap13_validate, /* validate */
(TT_CMap_Info_GetFunc)tt_cmap13_get_info /* get_cmap_info */
)
#endif /* TT_CONFIG_CMAP_FORMAT_13 */
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FORMAT 14 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* TABLE OVERVIEW
* --------------
*
* NAME OFFSET TYPE DESCRIPTION
*
* format 0 USHORT must be 14
* length 2 ULONG table length in bytes
* numSelector 6 ULONG number of variation sel. records
*
* Followed by numSelector records, each of which looks like
*
* varSelector 0 UINT24 Unicode codepoint of sel.
* defaultOff 3 ULONG offset to a default UVS table
* describing any variants to be found in
* the normal Unicode subtable.
* nonDefOff 7 ULONG offset to a non-default UVS table
* describing any variants not in the
* standard cmap, with GIDs here
* (either offset may be 0 NULL)
*
* Selectors are sorted by code point.
*
* A default Unicode Variation Selector (UVS) subtable is just a list of
* ranges of code points which are to be found in the standard cmap. No
* glyph IDs (GIDs) here.
*
* numRanges 0 ULONG number of ranges following
*
* A range looks like
*
* uniStart 0 UINT24 code point of the first character in
* this range
* additionalCnt 3 UBYTE count of additional characters in this
* range (zero means a range of a single
* character)
*
* Ranges are sorted by `uniStart'.
*
* A non-default Unicode Variation Selector (UVS) subtable is a list of
* mappings from codepoint to GID.
*
* numMappings 0 ULONG number of mappings
*
* A range looks like
*
* uniStart 0 UINT24 code point of the first character in
* this range
* GID 3 USHORT and its GID
*
* Ranges are sorted by `uniStart'.
*/
#ifdef TT_CONFIG_CMAP_FORMAT_14
typedef struct TT_CMap14Rec_
{
TT_CMapRec cmap;
FT_ULong num_selectors;
/* This array is used to store the results of various
* cmap 14 query functions. The data is overwritten
* on each call to these functions.
*/
FT_UInt32 max_results;
FT_UInt32* results;
FT_Memory memory;
} TT_CMap14Rec, *TT_CMap14;
FT_CALLBACK_DEF( void )
tt_cmap14_done( TT_CMap14 cmap )
{
FT_Memory memory = cmap->memory;
cmap->max_results = 0;
if ( memory && cmap->results )
FT_FREE( cmap->results );
}
static FT_Error
tt_cmap14_ensure( TT_CMap14 cmap,
FT_UInt32 num_results,
FT_Memory memory )
{
FT_UInt32 old_max = cmap->max_results;
FT_Error error = FT_Err_Ok;
if ( num_results > cmap->max_results )
{
cmap->memory = memory;
if ( FT_QRENEW_ARRAY( cmap->results, old_max, num_results ) )
return error;
cmap->max_results = num_results;
}
return error;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap14_init( TT_CMap14 cmap,
FT_Byte* table )
{
cmap->cmap.data = table;
table += 6;
cmap->num_selectors = FT_PEEK_ULONG( table );
cmap->max_results = 0;
cmap->results = NULL;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap14_validate( FT_Byte* table,
FT_Validator valid )
{
FT_Byte* p;
FT_ULong length;
FT_ULong num_selectors;
if ( table + 2 + 4 + 4 > valid->limit )
FT_INVALID_TOO_SHORT;
p = table + 2;
length = TT_NEXT_ULONG( p );
num_selectors = TT_NEXT_ULONG( p );
if ( length > (FT_ULong)( valid->limit - table ) ||
/* length < 10 + 11 * num_selectors ? */
length < 10 ||
( length - 10 ) / 11 < num_selectors )
FT_INVALID_TOO_SHORT;
/* check selectors, they must be in increasing order */
{
/* we start lastVarSel at 1 because a variant selector value of 0
* isn't valid.
*/
FT_ULong n, lastVarSel = 1;
for ( n = 0; n < num_selectors; n++ )
{
FT_ULong varSel = TT_NEXT_UINT24( p );
FT_ULong defOff = TT_NEXT_ULONG( p );
FT_ULong nondefOff = TT_NEXT_ULONG( p );
if ( defOff >= length || nondefOff >= length )
FT_INVALID_TOO_SHORT;
if ( varSel < lastVarSel )
FT_INVALID_DATA;
lastVarSel = varSel + 1;
/* check the default table (these glyphs should be reached */
/* through the normal Unicode cmap, no GIDs, just check order) */
if ( defOff != 0 )
{
FT_Byte* defp = table + defOff;
FT_ULong numRanges;
FT_ULong i;
FT_ULong lastBase = 0;
if ( defp + 4 > valid->limit )
FT_INVALID_TOO_SHORT;
numRanges = TT_NEXT_ULONG( defp );
/* defp + numRanges * 4 > valid->limit ? */
if ( numRanges > (FT_ULong)( valid->limit - defp ) / 4 )
FT_INVALID_TOO_SHORT;
for ( i = 0; i < numRanges; i++ )
{
FT_ULong base = TT_NEXT_UINT24( defp );
FT_ULong cnt = FT_NEXT_BYTE( defp );
if ( base + cnt >= 0x110000UL ) /* end of Unicode */
FT_INVALID_DATA;
if ( base < lastBase )
FT_INVALID_DATA;
lastBase = base + cnt + 1U;
}
}
/* and the non-default table (these glyphs are specified here) */
if ( nondefOff != 0 )
{
FT_Byte* ndp = table + nondefOff;
FT_ULong numMappings;
FT_ULong i, lastUni = 0;
if ( ndp + 4 > valid->limit )
FT_INVALID_TOO_SHORT;
numMappings = TT_NEXT_ULONG( ndp );
/* numMappings * 5 > (FT_ULong)( valid->limit - ndp ) ? */
if ( numMappings > ( (FT_ULong)( valid->limit - ndp ) ) / 5 )
FT_INVALID_TOO_SHORT;
for ( i = 0; i < numMappings; i++ )
{
FT_ULong uni = TT_NEXT_UINT24( ndp );
FT_ULong gid = TT_NEXT_USHORT( ndp );
if ( uni >= 0x110000UL ) /* end of Unicode */
FT_INVALID_DATA;
if ( uni < lastUni )
FT_INVALID_DATA;
lastUni = uni + 1U;
if ( valid->level >= FT_VALIDATE_TIGHT &&
gid >= TT_VALID_GLYPH_COUNT( valid ) )
FT_INVALID_GLYPH_ID;
}
}
}
}
return FT_Err_Ok;
}
FT_CALLBACK_DEF( FT_UInt )
tt_cmap14_char_index( TT_CMap cmap,
FT_UInt32 char_code )
{
FT_UNUSED( cmap );
FT_UNUSED( char_code );
/* This can't happen */
return 0;
}
FT_CALLBACK_DEF( FT_UInt32 )
tt_cmap14_char_next( TT_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_UNUSED( cmap );
/* This can't happen */
*pchar_code = 0;
return 0;
}
FT_CALLBACK_DEF( FT_Error )
tt_cmap14_get_info( TT_CMap cmap,
TT_CMapInfo *cmap_info )
{
FT_UNUSED( cmap );
cmap_info->format = 14;
/* subtable 14 does not define a language field */
cmap_info->language = 0xFFFFFFFFUL;
return FT_Err_Ok;
}
static FT_UInt
tt_cmap14_char_map_def_binary( FT_Byte *base,
FT_UInt32 char_code )
{
FT_UInt32 numRanges = TT_PEEK_ULONG( base );
FT_UInt32 max, min;
min = 0;
max = numRanges;
base += 4;
/* binary search */
while ( min < max )
{
FT_UInt32 mid = ( min + max ) >> 1;
FT_Byte* p = base + 4 * mid;
FT_ULong start = TT_NEXT_UINT24( p );
FT_UInt cnt = FT_NEXT_BYTE( p );
if ( char_code < start )
max = mid;
else if ( char_code > start + cnt )
min = mid + 1;
else
return TRUE;
}
return FALSE;
}
static FT_UInt
tt_cmap14_char_map_nondef_binary( FT_Byte *base,
FT_UInt32 char_code )
{
FT_UInt32 numMappings = TT_PEEK_ULONG( base );
FT_UInt32 max, min;
min = 0;
max = numMappings;
base += 4;
/* binary search */
while ( min < max )
{
FT_UInt32 mid = ( min + max ) >> 1;
FT_Byte* p = base + 5 * mid;
FT_UInt32 uni = (FT_UInt32)TT_NEXT_UINT24( p );
if ( char_code < uni )
max = mid;
else if ( char_code > uni )
min = mid + 1;
else
return TT_PEEK_USHORT( p );
}
return 0;
}
static FT_Byte*
tt_cmap14_find_variant( FT_Byte *base,
FT_UInt32 variantCode )
{
FT_UInt32 numVar = TT_PEEK_ULONG( base );
FT_UInt32 max, min;
min = 0;
max = numVar;
base += 4;
/* binary search */
while ( min < max )
{
FT_UInt32 mid = ( min + max ) >> 1;
FT_Byte* p = base + 11 * mid;
FT_ULong varSel = TT_NEXT_UINT24( p );
if ( variantCode < varSel )
max = mid;
else if ( variantCode > varSel )
min = mid + 1;
else
return p;
}
return NULL;
}
FT_CALLBACK_DEF( FT_UInt )
tt_cmap14_char_var_index( TT_CMap cmap,
TT_CMap ucmap,
FT_UInt32 charcode,
FT_UInt32 variantSelector )
{
FT_Byte* p = tt_cmap14_find_variant( cmap->data + 6, variantSelector );
FT_ULong defOff;
FT_ULong nondefOff;
if ( !p )
return 0;
defOff = TT_NEXT_ULONG( p );
nondefOff = TT_PEEK_ULONG( p );
if ( defOff != 0 &&
tt_cmap14_char_map_def_binary( cmap->data + defOff, charcode ) )
{
/* This is the default variant of this charcode. GID not stored */
/* here; stored in the normal Unicode charmap instead. */
return ucmap->cmap.clazz->char_index( &ucmap->cmap, charcode );
}
if ( nondefOff != 0 )
return tt_cmap14_char_map_nondef_binary( cmap->data + nondefOff,
charcode );
return 0;
}
FT_CALLBACK_DEF( FT_Int )
tt_cmap14_char_var_isdefault( TT_CMap cmap,
FT_UInt32 charcode,
FT_UInt32 variantSelector )
{
FT_Byte* p = tt_cmap14_find_variant( cmap->data + 6, variantSelector );
FT_ULong defOff;
FT_ULong nondefOff;
if ( !p )
return -1;
defOff = TT_NEXT_ULONG( p );
nondefOff = TT_NEXT_ULONG( p );
if ( defOff != 0 &&
tt_cmap14_char_map_def_binary( cmap->data + defOff, charcode ) )
return 1;
if ( nondefOff != 0 &&
tt_cmap14_char_map_nondef_binary( cmap->data + nondefOff,
charcode ) != 0 )
return 0;
return -1;
}
FT_CALLBACK_DEF( FT_UInt32* )
tt_cmap14_variants( TT_CMap cmap,
FT_Memory memory )
{
TT_CMap14 cmap14 = (TT_CMap14)cmap;
FT_UInt32 count = cmap14->num_selectors;
FT_Byte* p = cmap->data + 10;
FT_UInt32* result;
FT_UInt32 i;
if ( tt_cmap14_ensure( cmap14, ( count + 1 ), memory ) )
return NULL;
result = cmap14->results;
for ( i = 0; i < count; i++ )
{
result[i] = (FT_UInt32)TT_NEXT_UINT24( p );
p += 8;
}
result[i] = 0;