📄 gxvkern.c
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/***************************************************************************/
/* */
/* gxvkern.c */
/* */
/* TrueTypeGX/AAT kern table validation (body). */
/* */
/* Copyright 2004, 2005, 2006, 2007 */
/* 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( valid ) \
( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) )
#define KERN_IS_NEW( valid ) \
( KERN_VERSION_NEW == GXV_KERN_DATA( version ) )
#define KERN_DIALECT( valid ) \
GXV_KERN_DATA( dialect_request )
#define KERN_ALLOWS_MS( valid ) \
( KERN_DIALECT( valid ) & KERN_DIALECT_MS )
#define KERN_ALLOWS_APPLE( valid ) \
( KERN_DIALECT( valid ) & KERN_DIALECT_APPLE )
#define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 4 )
#define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 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 valid )
{
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;
FT_Short kernValue;
/* left */
gid_left = FT_NEXT_USHORT( p );
gxv_glyphid_validate( gid_left, valid );
/* right */
gid_right = FT_NEXT_USHORT( p );
gxv_glyphid_validate( gid_right, valid );
/* 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 */
kernValue = FT_NEXT_SHORT( p );
}
GXV_EXIT;
}
static void
gxv_kern_subtable_fmt0_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
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, valid );
p += 2 + 2 + 2 + 2;
gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, valid );
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 valid )
{
FT_Bytes p = table;
GXV_kern_fmt1_StateOptRecData optdata =
(GXV_kern_fmt1_StateOptRecData)valid->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 valid )
{
FT_UShort o[4];
FT_UShort *l[4];
FT_UShort buff[5];
GXV_kern_fmt1_StateOptRecData optdata =
(GXV_kern_fmt1_StateOptRecData)valid->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, valid );
}
/*
* 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_GlyphOffsetDesc glyphOffset,
FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_UShort push;
FT_UShort dontAdvance;
FT_UShort valueOffset;
FT_UShort kernAction;
FT_UShort kernValue;
FT_UNUSED( state );
FT_UNUSED( glyphOffset );
push = (FT_UShort)( ( flags >> 15 ) & 1 );
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
valueOffset = (FT_UShort)( flags & 0x3FFF );
{
GXV_kern_fmt1_StateOptRecData vt_rec =
(GXV_kern_fmt1_StateOptRecData)valid->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 );
kernAction = FT_NEXT_USHORT( p );
kernValue = FT_NEXT_USHORT( p );
}
}
static void
gxv_kern_subtable_fmt1_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_kern_fmt1_StateOptRec vt_rec;
GXV_NAME_ENTER( "kern subtable format 1" );
valid->statetable.optdata =
&vt_rec;
valid->statetable.optdata_load_func =
gxv_kern_subtable_fmt1_valueTable_load;
valid->statetable.subtable_setup_func =
gxv_kern_subtable_fmt1_subtable_setup;
valid->statetable.entry_glyphoffset_fmt =
GXV_GLYPHOFFSET_NONE;
valid->statetable.entry_validate_func =
gxv_kern_subtable_fmt1_entry_validate;
gxv_StateTable_validate( p, limit, valid );
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 valid )
{
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, valid );
gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), valid );
gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ),
&( GXV_KERN_FMT2_DATA( offset_min[spec] ) ),
&( GXV_KERN_FMT2_DATA( offset_max[spec] ) ),
valid );
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 valid )
{
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, valid );
gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit,
GXV_KERN_CLS_R, valid );
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] )
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