/****************************************************************************
*
* gxvkern.c
*
* TrueTypeGX/AAT kern table validation (body).
*
* Copyright (C) 2004-2022 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 <freetype/ftsnames.h>
#include <freetype/internal/services/svgxval.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 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=%ld, 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(( "interpret 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 interpret 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 = %lu\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 = %lu\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 %lu 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/%lu\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 */
