/***************************************************************************/ | |
/* */ | |
/* gxvkern.c */ | |
/* */ | |
/* TrueTypeGX/AAT kern table validation (body). */ | |
/* */ | |
/* Copyright 2004-2015 by */ | |
/* suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ | |
/* 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. */ | |
/* */ | |
/***************************************************************************/ | |
/***************************************************************************/ | |
/* */ | |
/* gxvalid is derived from both gxlayout module and otvalid module. */ | |
/* Development of gxlayout is supported by the Information-technology */ | |
/* Promotion Agency(IPA), Japan. */ | |
/* */ | |
/***************************************************************************/ | |
#include "gxvalid.h" | |
#include "gxvcommn.h" | |
#include FT_SFNT_NAMES_H | |
#include FT_SERVICE_GX_VALIDATE_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_gxvkern | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** Data and Types *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
typedef enum GXV_kern_Version_ | |
{ | |
KERN_VERSION_CLASSIC = 0x0000, | |
KERN_VERSION_NEW = 0x0001 | |
} GXV_kern_Version; | |
typedef enum GXV_kern_Dialect_ | |
{ | |
KERN_DIALECT_UNKNOWN = 0, | |
KERN_DIALECT_MS = FT_VALIDATE_MS, | |
KERN_DIALECT_APPLE = FT_VALIDATE_APPLE, | |
KERN_DIALECT_ANY = FT_VALIDATE_CKERN | |
} GXV_kern_Dialect; | |
typedef struct GXV_kern_DataRec_ | |
{ | |
GXV_kern_Version version; | |
void *subtable_data; | |
GXV_kern_Dialect dialect_request; | |
} GXV_kern_DataRec, *GXV_kern_Data; | |
#define GXV_KERN_DATA( field ) GXV_TABLE_DATA( kern, field ) | |
#define KERN_IS_CLASSIC( gxvalid ) \ | |
( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) ) | |
#define KERN_IS_NEW( gxvalid ) \ | |
( KERN_VERSION_NEW == GXV_KERN_DATA( version ) ) | |
#define KERN_DIALECT( gxvalid ) \ | |
GXV_KERN_DATA( dialect_request ) | |
#define KERN_ALLOWS_MS( gxvalid ) \ | |
( KERN_DIALECT( gxvalid ) & KERN_DIALECT_MS ) | |
#define KERN_ALLOWS_APPLE( gxvalid ) \ | |
( KERN_DIALECT( gxvalid ) & KERN_DIALECT_APPLE ) | |
#define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( gxvalid ) ? 8 : 4 ) | |
#define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( gxvalid ) ? 8 : 6 ) | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** SUBTABLE VALIDATORS *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/* ============================= format 0 ============================== */ | |
static void | |
gxv_kern_subtable_fmt0_pairs_validate( FT_Bytes table, | |
FT_Bytes limit, | |
FT_UShort nPairs, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
FT_UShort i; | |
FT_UShort last_gid_left = 0; | |
FT_UShort last_gid_right = 0; | |
FT_UNUSED( limit ); | |
GXV_NAME_ENTER( "kern format 0 pairs" ); | |
for ( i = 0; i < nPairs; i++ ) | |
{ | |
FT_UShort gid_left; | |
FT_UShort gid_right; | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_Short kernValue; | |
#endif | |
/* left */ | |
gid_left = FT_NEXT_USHORT( p ); | |
gxv_glyphid_validate( gid_left, gxvalid ); | |
/* right */ | |
gid_right = FT_NEXT_USHORT( p ); | |
gxv_glyphid_validate( gid_right, gxvalid ); | |
/* Pairs of left and right GIDs must be unique and sorted. */ | |
GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right )); | |
if ( gid_left == last_gid_left ) | |
{ | |
if ( last_gid_right < gid_right ) | |
last_gid_right = gid_right; | |
else | |
FT_INVALID_DATA; | |
} | |
else if ( last_gid_left < gid_left ) | |
{ | |
last_gid_left = gid_left; | |
last_gid_right = gid_right; | |
} | |
else | |
FT_INVALID_DATA; | |
/* skip the kern value */ | |
#ifdef GXV_LOAD_UNUSED_VARS | |
kernValue = FT_NEXT_SHORT( p ); | |
#else | |
p += 2; | |
#endif | |
} | |
GXV_EXIT; | |
} | |
static void | |
gxv_kern_subtable_fmt0_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; | |
FT_UShort nPairs; | |
FT_UShort unitSize; | |
GXV_NAME_ENTER( "kern subtable format 0" ); | |
unitSize = 2 + 2 + 2; | |
nPairs = 0; | |
/* nPairs, searchRange, entrySelector, rangeShift */ | |
GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); | |
gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, gxvalid ); | |
p += 2 + 2 + 2 + 2; | |
gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, gxvalid ); | |
GXV_EXIT; | |
} | |
/* ============================= format 1 ============================== */ | |
typedef struct GXV_kern_fmt1_StateOptRec_ | |
{ | |
FT_UShort valueTable; | |
FT_UShort valueTable_length; | |
} GXV_kern_fmt1_StateOptRec, *GXV_kern_fmt1_StateOptRecData; | |
static void | |
gxv_kern_subtable_fmt1_valueTable_load( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_kern_fmt1_StateOptRecData optdata = | |
(GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; | |
GXV_LIMIT_CHECK( 2 ); | |
optdata->valueTable = FT_NEXT_USHORT( p ); | |
} | |
/* | |
* passed tables_size covers whole StateTable, including kern fmt1 header | |
*/ | |
static void | |
gxv_kern_subtable_fmt1_subtable_setup( FT_UShort table_size, | |
FT_UShort classTable, | |
FT_UShort stateArray, | |
FT_UShort entryTable, | |
FT_UShort* classTable_length_p, | |
FT_UShort* stateArray_length_p, | |
FT_UShort* entryTable_length_p, | |
GXV_Validator gxvalid ) | |
{ | |
FT_UShort o[4]; | |
FT_UShort *l[4]; | |
FT_UShort buff[5]; | |
GXV_kern_fmt1_StateOptRecData optdata = | |
(GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; | |
o[0] = classTable; | |
o[1] = stateArray; | |
o[2] = entryTable; | |
o[3] = optdata->valueTable; | |
l[0] = classTable_length_p; | |
l[1] = stateArray_length_p; | |
l[2] = entryTable_length_p; | |
l[3] = &(optdata->valueTable_length); | |
gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, gxvalid ); | |
} | |
/* | |
* passed table & limit are of whole StateTable, not including subtables | |
*/ | |
static void | |
gxv_kern_subtable_fmt1_entry_validate( | |
FT_Byte state, | |
FT_UShort flags, | |
GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, | |
FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_UShort push; | |
FT_UShort dontAdvance; | |
#endif | |
FT_UShort valueOffset; | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_UShort kernAction; | |
FT_UShort kernValue; | |
#endif | |
FT_UNUSED( state ); | |
FT_UNUSED( glyphOffset_p ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
push = (FT_UShort)( ( flags >> 15 ) & 1 ); | |
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); | |
#endif | |
valueOffset = (FT_UShort)( flags & 0x3FFF ); | |
{ | |
GXV_kern_fmt1_StateOptRecData vt_rec = | |
(GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; | |
FT_Bytes p; | |
if ( valueOffset < vt_rec->valueTable ) | |
FT_INVALID_OFFSET; | |
p = table + valueOffset; | |
limit = table + vt_rec->valueTable + vt_rec->valueTable_length; | |
GXV_LIMIT_CHECK( 2 + 2 ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
kernAction = FT_NEXT_USHORT( p ); | |
kernValue = FT_NEXT_USHORT( p ); | |
#endif | |
} | |
} | |
static void | |
gxv_kern_subtable_fmt1_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_kern_fmt1_StateOptRec vt_rec; | |
GXV_NAME_ENTER( "kern subtable format 1" ); | |
gxvalid->statetable.optdata = | |
&vt_rec; | |
gxvalid->statetable.optdata_load_func = | |
gxv_kern_subtable_fmt1_valueTable_load; | |
gxvalid->statetable.subtable_setup_func = | |
gxv_kern_subtable_fmt1_subtable_setup; | |
gxvalid->statetable.entry_glyphoffset_fmt = | |
GXV_GLYPHOFFSET_NONE; | |
gxvalid->statetable.entry_validate_func = | |
gxv_kern_subtable_fmt1_entry_validate; | |
gxv_StateTable_validate( p, limit, gxvalid ); | |
GXV_EXIT; | |
} | |
/* ================ Data for Class-Based Subtables 2, 3 ================ */ | |
typedef enum GXV_kern_ClassSpec_ | |
{ | |
GXV_KERN_CLS_L = 0, | |
GXV_KERN_CLS_R | |
} GXV_kern_ClassSpec; | |
/* ============================= format 2 ============================== */ | |
/* ---------------------- format 2 specific data ----------------------- */ | |
typedef struct GXV_kern_subtable_fmt2_DataRec_ | |
{ | |
FT_UShort rowWidth; | |
FT_UShort array; | |
FT_UShort offset_min[2]; | |
FT_UShort offset_max[2]; | |
const FT_String* class_tag[2]; | |
GXV_odtect_Range odtect; | |
} GXV_kern_subtable_fmt2_DataRec, *GXV_kern_subtable_fmt2_Data; | |
#define GXV_KERN_FMT2_DATA( field ) \ | |
( ( (GXV_kern_subtable_fmt2_DataRec *) \ | |
( GXV_KERN_DATA( subtable_data ) ) )->field ) | |
/* -------------------------- utility functions ----------------------- */ | |
static void | |
gxv_kern_subtable_fmt2_clstbl_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_kern_ClassSpec spec, | |
GXV_Validator gxvalid ) | |
{ | |
const FT_String* tag = GXV_KERN_FMT2_DATA( class_tag[spec] ); | |
GXV_odtect_Range odtect = GXV_KERN_FMT2_DATA( odtect ); | |
FT_Bytes p = table; | |
FT_UShort firstGlyph; | |
FT_UShort nGlyphs; | |
GXV_NAME_ENTER( "kern format 2 classTable" ); | |
GXV_LIMIT_CHECK( 2 + 2 ); | |
firstGlyph = FT_NEXT_USHORT( p ); | |
nGlyphs = FT_NEXT_USHORT( p ); | |
GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n", | |
tag, firstGlyph, nGlyphs )); | |
gxv_glyphid_validate( firstGlyph, gxvalid ); | |
gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), gxvalid ); | |
gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ), | |
&( GXV_KERN_FMT2_DATA( offset_min[spec] ) ), | |
&( GXV_KERN_FMT2_DATA( offset_max[spec] ) ), | |
gxvalid ); | |
gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect ); | |
GXV_EXIT; | |
} | |
static void | |
gxv_kern_subtable_fmt2_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
GXV_ODTECT( 3, odtect ); | |
GXV_kern_subtable_fmt2_DataRec fmt2_rec = | |
{ 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL }; | |
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; | |
FT_UShort leftOffsetTable; | |
FT_UShort rightOffsetTable; | |
GXV_NAME_ENTER( "kern subtable format 2" ); | |
GXV_ODTECT_INIT( odtect ); | |
fmt2_rec.odtect = odtect; | |
GXV_KERN_DATA( subtable_data ) = &fmt2_rec; | |
GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); | |
GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p ); | |
leftOffsetTable = FT_NEXT_USHORT( p ); | |
rightOffsetTable = FT_NEXT_USHORT( p ); | |
GXV_KERN_FMT2_DATA( array ) = FT_NEXT_USHORT( p ); | |
GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) )); | |
GXV_LIMIT_CHECK( leftOffsetTable ); | |
GXV_LIMIT_CHECK( rightOffsetTable ); | |
GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) ); | |
gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit, | |
GXV_KERN_CLS_L, gxvalid ); | |
gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit, | |
GXV_KERN_CLS_R, gxvalid ); | |
if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) + | |
GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] ) | |
< GXV_KERN_FMT2_DATA( array ) ) | |
FT_INVALID_OFFSET; | |
gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ), | |
GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] ) | |
+ GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] ) | |
- GXV_KERN_FMT2_DATA( array ), | |
"array", odtect ); | |
gxv_odtect_validate( odtect, gxvalid ); | |
GXV_EXIT; | |
} | |
/* ============================= format 3 ============================== */ | |
static void | |
gxv_kern_subtable_fmt3_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; | |
FT_UShort glyphCount; | |
FT_Byte kernValueCount; | |
FT_Byte leftClassCount; | |
FT_Byte rightClassCount; | |
FT_Byte flags; | |
GXV_NAME_ENTER( "kern subtable format 3" ); | |
GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 ); | |
glyphCount = FT_NEXT_USHORT( p ); | |
kernValueCount = FT_NEXT_BYTE( p ); | |
leftClassCount = FT_NEXT_BYTE( p ); | |
rightClassCount = FT_NEXT_BYTE( p ); | |
flags = FT_NEXT_BYTE( p ); | |
if ( gxvalid->face->num_glyphs != glyphCount ) | |
{ | |
GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n", | |
gxvalid->face->num_glyphs, glyphCount )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); | |
} | |
if ( flags != 0 ) | |
GXV_TRACE(( "kern subtable fmt3 has nonzero value" | |
" (%d) in unused flag\n", flags )); | |
/* | |
* just skip kernValue[kernValueCount] | |
*/ | |
GXV_LIMIT_CHECK( 2 * kernValueCount ); | |
p += 2 * kernValueCount; | |
/* | |
* check leftClass[gid] < leftClassCount | |
*/ | |
{ | |
FT_Byte min, max; | |
GXV_LIMIT_CHECK( glyphCount ); | |
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid ); | |
p += gxvalid->subtable_length; | |
if ( leftClassCount < max ) | |
FT_INVALID_DATA; | |
} | |
/* | |
* check rightClass[gid] < rightClassCount | |
*/ | |
{ | |
FT_Byte min, max; | |
GXV_LIMIT_CHECK( glyphCount ); | |
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid ); | |
p += gxvalid->subtable_length; | |
if ( rightClassCount < max ) | |
FT_INVALID_DATA; | |
} | |
/* | |
* check kernIndex[i, j] < kernValueCount | |
*/ | |
{ | |
FT_UShort i, j; | |
for ( i = 0; i < leftClassCount; i++ ) | |
{ | |
for ( j = 0; j < rightClassCount; j++ ) | |
{ | |
GXV_LIMIT_CHECK( 1 ); | |
if ( kernValueCount < FT_NEXT_BYTE( p ) ) | |
FT_INVALID_OFFSET; | |
} | |
} | |
} | |
gxvalid->subtable_length = (FT_ULong)( p - table ); | |
GXV_EXIT; | |
} | |
static FT_Bool | |
gxv_kern_coverage_new_apple_validate( FT_UShort coverage, | |
FT_UShort* format, | |
GXV_Validator gxvalid ) | |
{ | |
/* new Apple-dialect */ | |
#ifdef GXV_LOAD_TRACE_VARS | |
FT_Bool kernVertical; | |
FT_Bool kernCrossStream; | |
FT_Bool kernVariation; | |
#endif | |
FT_UNUSED( gxvalid ); | |
/* reserved bits = 0 */ | |
if ( coverage & 0x1FFC ) | |
return FALSE; | |
#ifdef GXV_LOAD_TRACE_VARS | |
kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 ); | |
kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 ); | |
kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 ); | |
#endif | |
*format = (FT_UShort)( coverage & 0x0003 ); | |
GXV_TRACE(( "new Apple-dialect: " | |
"horizontal=%d, cross-stream=%d, variation=%d, format=%d\n", | |
!kernVertical, kernCrossStream, kernVariation, *format )); | |
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); | |
return TRUE; | |
} | |
static FT_Bool | |
gxv_kern_coverage_classic_apple_validate( FT_UShort coverage, | |
FT_UShort* format, | |
GXV_Validator gxvalid ) | |
{ | |
/* classic Apple-dialect */ | |
#ifdef GXV_LOAD_TRACE_VARS | |
FT_Bool horizontal; | |
FT_Bool cross_stream; | |
#endif | |
/* check expected flags, but don't check if MS-dialect is impossible */ | |
if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( gxvalid ) ) | |
return FALSE; | |
/* reserved bits = 0 */ | |
if ( coverage & 0x02FC ) | |
return FALSE; | |
#ifdef GXV_LOAD_TRACE_VARS | |
horizontal = FT_BOOL( ( coverage >> 15 ) & 1 ); | |
cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 ); | |
#endif | |
*format = (FT_UShort)( coverage & 0x0003 ); | |
GXV_TRACE(( "classic Apple-dialect: " | |
"horizontal=%d, cross-stream=%d, format=%d\n", | |
horizontal, cross_stream, *format )); | |
/* format 1 requires GX State Machine, too new for classic */ | |
if ( *format == 1 ) | |
return FALSE; | |
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); | |
return TRUE; | |
} | |
static FT_Bool | |
gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage, | |
FT_UShort* format, | |
GXV_Validator gxvalid ) | |
{ | |
/* classic Microsoft-dialect */ | |
#ifdef GXV_LOAD_TRACE_VARS | |
FT_Bool horizontal; | |
FT_Bool minimum; | |
FT_Bool cross_stream; | |
FT_Bool override; | |
#endif | |
FT_UNUSED( gxvalid ); | |
/* reserved bits = 0 */ | |
if ( coverage & 0xFDF0 ) | |
return FALSE; | |
#ifdef GXV_LOAD_TRACE_VARS | |
horizontal = FT_BOOL( coverage & 1 ); | |
minimum = FT_BOOL( ( coverage >> 1 ) & 1 ); | |
cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 ); | |
override = FT_BOOL( ( coverage >> 3 ) & 1 ); | |
#endif | |
*format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 ); | |
GXV_TRACE(( "classic Microsoft-dialect: " | |
"horizontal=%d, minimum=%d, cross-stream=%d, " | |
"override=%d, format=%d\n", | |
horizontal, minimum, cross_stream, override, *format )); | |
if ( *format == 2 ) | |
GXV_TRACE(( | |
"kerning values in Microsoft format 2 subtable are ignored\n" )); | |
return TRUE; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** MAIN *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
static GXV_kern_Dialect | |
gxv_kern_coverage_validate( FT_UShort coverage, | |
FT_UShort* format, | |
GXV_Validator gxvalid ) | |
{ | |
GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN; | |
GXV_NAME_ENTER( "validating coverage" ); | |
GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage )); | |
if ( KERN_IS_NEW( gxvalid ) ) | |
{ | |
if ( gxv_kern_coverage_new_apple_validate( coverage, | |
format, | |
gxvalid ) ) | |
{ | |
result = KERN_DIALECT_APPLE; | |
goto Exit; | |
} | |
} | |
if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_APPLE( gxvalid ) ) | |
{ | |
if ( gxv_kern_coverage_classic_apple_validate( coverage, | |
format, | |
gxvalid ) ) | |
{ | |
result = KERN_DIALECT_APPLE; | |
goto Exit; | |
} | |
} | |
if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_MS( gxvalid ) ) | |
{ | |
if ( gxv_kern_coverage_classic_microsoft_validate( coverage, | |
format, | |
gxvalid ) ) | |
{ | |
result = KERN_DIALECT_MS; | |
goto Exit; | |
} | |
} | |
GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" )); | |
Exit: | |
GXV_EXIT; | |
return result; | |
} | |
static void | |
gxv_kern_subtable_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
#ifdef GXV_LOAD_TRACE_VARS | |
FT_UShort version = 0; /* MS only: subtable version, unused */ | |
#endif | |
FT_ULong length; /* MS: 16bit, Apple: 32bit*/ | |
FT_UShort coverage; | |
#ifdef GXV_LOAD_TRACE_VARS | |
FT_UShort tupleIndex = 0; /* Apple only */ | |
#endif | |
FT_UShort u16[2]; | |
FT_UShort format = 255; /* subtable format */ | |
GXV_NAME_ENTER( "kern subtable" ); | |
GXV_LIMIT_CHECK( 2 + 2 + 2 ); | |
u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */ | |
u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */ | |
coverage = FT_NEXT_USHORT( p ); | |
switch ( gxv_kern_coverage_validate( coverage, &format, gxvalid ) ) | |
{ | |
case KERN_DIALECT_MS: | |
#ifdef GXV_LOAD_TRACE_VARS | |
version = u16[0]; | |
#endif | |
length = u16[1]; | |
#ifdef GXV_LOAD_TRACE_VARS | |
tupleIndex = 0; | |
#endif | |
GXV_TRACE(( "Subtable version = %d\n", version )); | |
GXV_TRACE(( "Subtable length = %d\n", length )); | |
break; | |
case KERN_DIALECT_APPLE: | |
#ifdef GXV_LOAD_TRACE_VARS | |
version = 0; | |
#endif | |
length = ( (FT_ULong)u16[0] << 16 ) + u16[1]; | |
#ifdef GXV_LOAD_TRACE_VARS | |
tupleIndex = 0; | |
#endif | |
GXV_TRACE(( "Subtable length = %d\n", length )); | |
if ( KERN_IS_NEW( gxvalid ) ) | |
{ | |
GXV_LIMIT_CHECK( 2 ); | |
#ifdef GXV_LOAD_TRACE_VARS | |
tupleIndex = FT_NEXT_USHORT( p ); | |
#else | |
p += 2; | |
#endif | |
GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex )); | |
} | |
break; | |
default: | |
length = u16[1]; | |
GXV_TRACE(( "cannot detect subtable dialect, " | |
"just skip %d byte\n", length )); | |
goto Exit; | |
} | |
/* formats 1, 2, 3 require the position of the start of this subtable */ | |
if ( format == 0 ) | |
gxv_kern_subtable_fmt0_validate( table, table + length, gxvalid ); | |
else if ( format == 1 ) | |
gxv_kern_subtable_fmt1_validate( table, table + length, gxvalid ); | |
else if ( format == 2 ) | |
gxv_kern_subtable_fmt2_validate( table, table + length, gxvalid ); | |
else if ( format == 3 ) | |
gxv_kern_subtable_fmt3_validate( table, table + length, gxvalid ); | |
else | |
FT_INVALID_DATA; | |
Exit: | |
gxvalid->subtable_length = length; | |
GXV_EXIT; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** kern TABLE *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
static void | |
gxv_kern_validate_generic( FT_Bytes table, | |
FT_Face face, | |
FT_Bool classic_only, | |
GXV_kern_Dialect dialect_request, | |
FT_Validator ftvalid ) | |
{ | |
GXV_ValidatorRec gxvalidrec; | |
GXV_Validator gxvalid = &gxvalidrec; | |
GXV_kern_DataRec kernrec; | |
GXV_kern_Data kern = &kernrec; | |
FT_Bytes p = table; | |
FT_Bytes limit = 0; | |
FT_ULong nTables = 0; | |
FT_UInt i; | |
gxvalid->root = ftvalid; | |
gxvalid->table_data = kern; | |
gxvalid->face = face; | |
FT_TRACE3(( "validating `kern' table\n" )); | |
GXV_INIT; | |
KERN_DIALECT( gxvalid ) = dialect_request; | |
GXV_LIMIT_CHECK( 2 ); | |
GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p ); | |
GXV_TRACE(( "version 0x%04x (higher 16bit)\n", | |
GXV_KERN_DATA( version ) )); | |
if ( 0x0001 < GXV_KERN_DATA( version ) ) | |
FT_INVALID_FORMAT; | |
else if ( KERN_IS_CLASSIC( gxvalid ) ) | |
{ | |
GXV_LIMIT_CHECK( 2 ); | |
nTables = FT_NEXT_USHORT( p ); | |
} | |
else if ( KERN_IS_NEW( gxvalid ) ) | |
{ | |
if ( classic_only ) | |
FT_INVALID_FORMAT; | |
if ( 0x0000 != FT_NEXT_USHORT( p ) ) | |
FT_INVALID_FORMAT; | |
GXV_LIMIT_CHECK( 4 ); | |
nTables = FT_NEXT_ULONG( p ); | |
} | |
for ( i = 0; i < nTables; i++ ) | |
{ | |
GXV_TRACE(( "validating subtable %d/%d\n", i, nTables )); | |
/* p should be 32bit-aligned? */ | |
gxv_kern_subtable_validate( p, 0, gxvalid ); | |
p += gxvalid->subtable_length; | |
} | |
FT_TRACE4(( "\n" )); | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_kern_validate( FT_Bytes table, | |
FT_Face face, | |
FT_Validator ftvalid ) | |
{ | |
gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid ); | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_kern_validate_classic( FT_Bytes table, | |
FT_Face face, | |
FT_Int dialect_flags, | |
FT_Validator ftvalid ) | |
{ | |
GXV_kern_Dialect dialect_request; | |
dialect_request = (GXV_kern_Dialect)dialect_flags; | |
gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid ); | |
} | |
/* END */ |