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/***************************************************************************/
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/* */
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/* gxvkern.c */
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/* */
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/* TrueTypeGX/AAT kern table validation (body). */
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/* */
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/* Copyright 2004, 2005, 2006, 2007 */
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/* by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/***************************************************************************/
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/* */
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/* gxvalid is derived from both gxlayout module and otvalid module. */
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/* Development of gxlayout is supported by the Information-technology */
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/* Promotion Agency(IPA), Japan. */
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/* */
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/***************************************************************************/
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#include "gxvalid.h"
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#include "gxvcommn.h"
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#include FT_SFNT_NAMES_H
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#include FT_SERVICE_GX_VALIDATE_H
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_gxvkern
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** Data and Types *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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typedef enum GXV_kern_Version_
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{
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KERN_VERSION_CLASSIC = 0x0000,
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KERN_VERSION_NEW = 0x0001
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} GXV_kern_Version;
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typedef enum GXV_kern_Dialect_
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{
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KERN_DIALECT_UNKNOWN = 0,
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KERN_DIALECT_MS = FT_VALIDATE_MS,
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KERN_DIALECT_APPLE = FT_VALIDATE_APPLE,
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KERN_DIALECT_ANY = FT_VALIDATE_CKERN
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} GXV_kern_Dialect;
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typedef struct GXV_kern_DataRec_
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{
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GXV_kern_Version version;
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void *subtable_data;
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GXV_kern_Dialect dialect_request;
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} GXV_kern_DataRec, *GXV_kern_Data;
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#define GXV_KERN_DATA( field ) GXV_TABLE_DATA( kern, field )
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#define KERN_IS_CLASSIC( valid ) \
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( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) )
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#define KERN_IS_NEW( valid ) \
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( KERN_VERSION_NEW == GXV_KERN_DATA( version ) )
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#define KERN_DIALECT( valid ) \
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GXV_KERN_DATA( dialect_request )
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#define KERN_ALLOWS_MS( valid ) \
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( KERN_DIALECT( valid ) & KERN_DIALECT_MS )
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#define KERN_ALLOWS_APPLE( valid ) \
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( KERN_DIALECT( valid ) & KERN_DIALECT_APPLE )
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#define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 4 )
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#define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 6 )
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** SUBTABLE VALIDATORS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* ============================= format 0 ============================== */
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static void
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gxv_kern_subtable_fmt0_pairs_validate( FT_Bytes table,
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FT_Bytes limit,
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FT_UShort nPairs,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UShort i;
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FT_UShort last_gid_left = 0;
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FT_UShort last_gid_right = 0;
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FT_UNUSED( limit );
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GXV_NAME_ENTER( "kern format 0 pairs" );
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for ( i = 0; i < nPairs; i++ )
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{
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FT_UShort gid_left;
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FT_UShort gid_right;
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FT_Short kernValue;
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/* left */
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gid_left = FT_NEXT_USHORT( p );
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gxv_glyphid_validate( gid_left, valid );
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/* right */
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gid_right = FT_NEXT_USHORT( p );
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gxv_glyphid_validate( gid_right, valid );
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/* Pairs of left and right GIDs must be unique and sorted. */
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GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right ));
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if ( gid_left == last_gid_left )
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{
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if ( last_gid_right < gid_right )
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last_gid_right = gid_right;
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else
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FT_INVALID_DATA;
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}
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else if ( last_gid_left < gid_left )
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{
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last_gid_left = gid_left;
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last_gid_right = gid_right;
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}
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else
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FT_INVALID_DATA;
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/* skip the kern value */
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kernValue = FT_NEXT_SHORT( p );
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}
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GXV_EXIT;
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}
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static void
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gxv_kern_subtable_fmt0_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
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FT_UShort nPairs;
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FT_UShort unitSize;
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GXV_NAME_ENTER( "kern subtable format 0" );
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unitSize = 2 + 2 + 2;
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nPairs = 0;
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/* nPairs, searchRange, entrySelector, rangeShift */
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GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
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gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, valid );
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p += 2 + 2 + 2 + 2;
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gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, valid );
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GXV_EXIT;
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}
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/* ============================= format 1 ============================== */
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typedef struct GXV_kern_fmt1_StateOptRec_
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{
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FT_UShort valueTable;
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FT_UShort valueTable_length;
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} GXV_kern_fmt1_StateOptRec, *GXV_kern_fmt1_StateOptRecData;
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static void
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gxv_kern_subtable_fmt1_valueTable_load( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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GXV_kern_fmt1_StateOptRecData optdata =
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(GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
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GXV_LIMIT_CHECK( 2 );
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optdata->valueTable = FT_NEXT_USHORT( p );
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}
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/*
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* passed tables_size covers whole StateTable, including kern fmt1 header
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*/
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static void
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gxv_kern_subtable_fmt1_subtable_setup( FT_UShort table_size,
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FT_UShort classTable,
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FT_UShort stateArray,
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FT_UShort entryTable,
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FT_UShort* classTable_length_p,
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FT_UShort* stateArray_length_p,
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FT_UShort* entryTable_length_p,
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GXV_Validator valid )
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{
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FT_UShort o[4];
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FT_UShort *l[4];
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FT_UShort buff[5];
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GXV_kern_fmt1_StateOptRecData optdata =
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(GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
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o[0] = classTable;
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o[1] = stateArray;
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o[2] = entryTable;
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o[3] = optdata->valueTable;
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l[0] = classTable_length_p;
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l[1] = stateArray_length_p;
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l[2] = entryTable_length_p;
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l[3] = &(optdata->valueTable_length);
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gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid );
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}
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/*
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* passed table & limit are of whole StateTable, not including subtables
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*/
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static void
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gxv_kern_subtable_fmt1_entry_validate(
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FT_Byte state,
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FT_UShort flags,
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GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
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FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_UShort push;
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FT_UShort dontAdvance;
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FT_UShort valueOffset;
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FT_UShort kernAction;
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FT_UShort kernValue;
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FT_UNUSED( state );
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FT_UNUSED( glyphOffset_p );
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push = (FT_UShort)( ( flags >> 15 ) & 1 );
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dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
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valueOffset = (FT_UShort)( flags & 0x3FFF );
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{
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GXV_kern_fmt1_StateOptRecData vt_rec =
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(GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
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FT_Bytes p;
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if ( valueOffset < vt_rec->valueTable )
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FT_INVALID_OFFSET;
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p = table + valueOffset;
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limit = table + vt_rec->valueTable + vt_rec->valueTable_length;
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GXV_LIMIT_CHECK( 2 + 2 );
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kernAction = FT_NEXT_USHORT( p );
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kernValue = FT_NEXT_USHORT( p );
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}
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}
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static void
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gxv_kern_subtable_fmt1_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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GXV_kern_fmt1_StateOptRec vt_rec;
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304 |
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305 |
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GXV_NAME_ENTER( "kern subtable format 1" );
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307 |
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valid->statetable.optdata =
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&vt_rec;
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valid->statetable.optdata_load_func =
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gxv_kern_subtable_fmt1_valueTable_load;
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valid->statetable.subtable_setup_func =
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gxv_kern_subtable_fmt1_subtable_setup;
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valid->statetable.entry_glyphoffset_fmt =
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GXV_GLYPHOFFSET_NONE;
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valid->statetable.entry_validate_func =
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gxv_kern_subtable_fmt1_entry_validate;
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318 |
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gxv_StateTable_validate( p, limit, valid );
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320 |
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321 |
GXV_EXIT;
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}
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323 |
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324 |
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/* ================ Data for Class-Based Subtables 2, 3 ================ */
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326 |
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typedef enum GXV_kern_ClassSpec_
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{
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GXV_KERN_CLS_L = 0,
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GXV_KERN_CLS_R
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331 |
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} GXV_kern_ClassSpec;
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333 |
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334 |
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335 |
/* ============================= format 2 ============================== */
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336 |
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337 |
/* ---------------------- format 2 specific data ----------------------- */
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338 |
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339 |
typedef struct GXV_kern_subtable_fmt2_DataRec_
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340 |
{
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341 |
FT_UShort rowWidth;
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342 |
FT_UShort array;
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343 |
FT_UShort offset_min[2];
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344 |
FT_UShort offset_max[2];
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345 |
const FT_String* class_tag[2];
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GXV_odtect_Range odtect;
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347 |
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348 |
} GXV_kern_subtable_fmt2_DataRec, *GXV_kern_subtable_fmt2_Data;
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349 |
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350 |
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351 |
#define GXV_KERN_FMT2_DATA( field ) \
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( ( (GXV_kern_subtable_fmt2_DataRec *) \
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( GXV_KERN_DATA( subtable_data ) ) )->field )
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354 |
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355 |
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356 |
/* -------------------------- utility functions ----------------------- */
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357 |
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358 |
static void
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359 |
gxv_kern_subtable_fmt2_clstbl_validate( FT_Bytes table,
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360 |
FT_Bytes limit,
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361 |
GXV_kern_ClassSpec spec,
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362 |
GXV_Validator valid )
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363 |
{
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364 |
const FT_String* tag = GXV_KERN_FMT2_DATA( class_tag[spec] );
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365 |
GXV_odtect_Range odtect = GXV_KERN_FMT2_DATA( odtect );
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366 |
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367 |
FT_Bytes p = table;
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368 |
FT_UShort firstGlyph;
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369 |
FT_UShort nGlyphs;
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370 |
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371 |
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372 |
GXV_NAME_ENTER( "kern format 2 classTable" );
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373 |
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374 |
GXV_LIMIT_CHECK( 2 + 2 );
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375 |
firstGlyph = FT_NEXT_USHORT( p );
|
|
|
376 |
nGlyphs = FT_NEXT_USHORT( p );
|
|
|
377 |
GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n",
|
|
|
378 |
tag, firstGlyph, nGlyphs ));
|
|
|
379 |
|
|
|
380 |
gxv_glyphid_validate( firstGlyph, valid );
|
|
|
381 |
gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), valid );
|
|
|
382 |
|
|
|
383 |
gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ),
|
|
|
384 |
&( GXV_KERN_FMT2_DATA( offset_min[spec] ) ),
|
|
|
385 |
&( GXV_KERN_FMT2_DATA( offset_max[spec] ) ),
|
|
|
386 |
valid );
|
|
|
387 |
|
|
|
388 |
gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect );
|
|
|
389 |
|
|
|
390 |
GXV_EXIT;
|
|
|
391 |
}
|
|
|
392 |
|
|
|
393 |
|
|
|
394 |
static void
|
|
|
395 |
gxv_kern_subtable_fmt2_validate( FT_Bytes table,
|
|
|
396 |
FT_Bytes limit,
|
|
|
397 |
GXV_Validator valid )
|
|
|
398 |
{
|
|
|
399 |
GXV_ODTECT( 3, odtect );
|
|
|
400 |
GXV_kern_subtable_fmt2_DataRec fmt2_rec =
|
|
|
401 |
{ 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL };
|
|
|
402 |
|
|
|
403 |
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
|
|
|
404 |
FT_UShort leftOffsetTable;
|
|
|
405 |
FT_UShort rightOffsetTable;
|
|
|
406 |
|
|
|
407 |
|
|
|
408 |
GXV_NAME_ENTER( "kern subtable format 2" );
|
|
|
409 |
|
|
|
410 |
GXV_ODTECT_INIT( odtect );
|
|
|
411 |
fmt2_rec.odtect = odtect;
|
|
|
412 |
GXV_KERN_DATA( subtable_data ) = &fmt2_rec;
|
|
|
413 |
|
|
|
414 |
GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
|
|
|
415 |
GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p );
|
|
|
416 |
leftOffsetTable = FT_NEXT_USHORT( p );
|
|
|
417 |
rightOffsetTable = FT_NEXT_USHORT( p );
|
|
|
418 |
GXV_KERN_FMT2_DATA( array ) = FT_NEXT_USHORT( p );
|
|
|
419 |
|
|
|
420 |
GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) ));
|
|
|
421 |
|
|
|
422 |
|
|
|
423 |
GXV_LIMIT_CHECK( leftOffsetTable );
|
|
|
424 |
GXV_LIMIT_CHECK( rightOffsetTable );
|
|
|
425 |
GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) );
|
|
|
426 |
|
|
|
427 |
gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit,
|
|
|
428 |
GXV_KERN_CLS_L, valid );
|
|
|
429 |
|
|
|
430 |
gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit,
|
|
|
431 |
GXV_KERN_CLS_R, valid );
|
|
|
432 |
|
|
|
433 |
if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) +
|
|
|
434 |
GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] )
|
|
|
435 |
< GXV_KERN_FMT2_DATA( array ) )
|
|
|
436 |
FT_INVALID_OFFSET;
|
|
|
437 |
|
|
|
438 |
gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ),
|
|
|
439 |
GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] )
|
|
|
440 |
+ GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] )
|
|
|
441 |
- GXV_KERN_FMT2_DATA( array ),
|
|
|
442 |
"array", odtect );
|
|
|
443 |
|
|
|
444 |
gxv_odtect_validate( odtect, valid );
|
|
|
445 |
|
|
|
446 |
GXV_EXIT;
|
|
|
447 |
}
|
|
|
448 |
|
|
|
449 |
|
|
|
450 |
/* ============================= format 3 ============================== */
|
|
|
451 |
|
|
|
452 |
static void
|
|
|
453 |
gxv_kern_subtable_fmt3_validate( FT_Bytes table,
|
|
|
454 |
FT_Bytes limit,
|
|
|
455 |
GXV_Validator valid )
|
|
|
456 |
{
|
|
|
457 |
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
|
|
|
458 |
FT_UShort glyphCount;
|
|
|
459 |
FT_Byte kernValueCount;
|
|
|
460 |
FT_Byte leftClassCount;
|
|
|
461 |
FT_Byte rightClassCount;
|
|
|
462 |
FT_Byte flags;
|
|
|
463 |
|
|
|
464 |
|
|
|
465 |
GXV_NAME_ENTER( "kern subtable format 3" );
|
|
|
466 |
|
|
|
467 |
GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 );
|
|
|
468 |
glyphCount = FT_NEXT_USHORT( p );
|
|
|
469 |
kernValueCount = FT_NEXT_BYTE( p );
|
|
|
470 |
leftClassCount = FT_NEXT_BYTE( p );
|
|
|
471 |
rightClassCount = FT_NEXT_BYTE( p );
|
|
|
472 |
flags = FT_NEXT_BYTE( p );
|
|
|
473 |
|
|
|
474 |
if ( valid->face->num_glyphs != glyphCount )
|
|
|
475 |
{
|
|
|
476 |
GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n",
|
|
|
477 |
valid->face->num_glyphs, glyphCount ));
|
|
|
478 |
if ( valid->root->level >= FT_VALIDATE_PARANOID )
|
|
|
479 |
FT_INVALID_GLYPH_ID;
|
|
|
480 |
}
|
|
|
481 |
|
|
|
482 |
/*
|
|
|
483 |
* just skip kernValue[kernValueCount]
|
|
|
484 |
*/
|
|
|
485 |
GXV_LIMIT_CHECK( 2 * kernValueCount );
|
|
|
486 |
p += 2 * kernValueCount;
|
|
|
487 |
|
|
|
488 |
/*
|
|
|
489 |
* check leftClass[gid] < leftClassCount
|
|
|
490 |
*/
|
|
|
491 |
{
|
|
|
492 |
FT_Byte min, max;
|
|
|
493 |
|
|
|
494 |
|
|
|
495 |
GXV_LIMIT_CHECK( glyphCount );
|
|
|
496 |
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
|
|
|
497 |
p += valid->subtable_length;
|
|
|
498 |
|
|
|
499 |
if ( leftClassCount < max )
|
|
|
500 |
FT_INVALID_DATA;
|
|
|
501 |
}
|
|
|
502 |
|
|
|
503 |
/*
|
|
|
504 |
* check rightClass[gid] < rightClassCount
|
|
|
505 |
*/
|
|
|
506 |
{
|
|
|
507 |
FT_Byte min, max;
|
|
|
508 |
|
|
|
509 |
|
|
|
510 |
GXV_LIMIT_CHECK( glyphCount );
|
|
|
511 |
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
|
|
|
512 |
p += valid->subtable_length;
|
|
|
513 |
|
|
|
514 |
if ( rightClassCount < max )
|
|
|
515 |
FT_INVALID_DATA;
|
|
|
516 |
}
|
|
|
517 |
|
|
|
518 |
/*
|
|
|
519 |
* check kernIndex[i, j] < kernValueCount
|
|
|
520 |
*/
|
|
|
521 |
{
|
|
|
522 |
FT_UShort i, j;
|
|
|
523 |
|
|
|
524 |
|
|
|
525 |
for ( i = 0; i < leftClassCount; i++ )
|
|
|
526 |
{
|
|
|
527 |
for ( j = 0; j < rightClassCount; j++ )
|
|
|
528 |
{
|
|
|
529 |
GXV_LIMIT_CHECK( 1 );
|
|
|
530 |
if ( kernValueCount < FT_NEXT_BYTE( p ) )
|
|
|
531 |
FT_INVALID_OFFSET;
|
|
|
532 |
}
|
|
|
533 |
}
|
|
|
534 |
}
|
|
|
535 |
|
|
|
536 |
valid->subtable_length = p - table;
|
|
|
537 |
|
|
|
538 |
GXV_EXIT;
|
|
|
539 |
}
|
|
|
540 |
|
|
|
541 |
|
|
|
542 |
static FT_Bool
|
|
|
543 |
gxv_kern_coverage_new_apple_validate( FT_UShort coverage,
|
|
|
544 |
FT_UShort* format,
|
|
|
545 |
GXV_Validator valid )
|
|
|
546 |
{
|
|
|
547 |
/* new Apple-dialect */
|
|
|
548 |
FT_Bool kernVertical;
|
|
|
549 |
FT_Bool kernCrossStream;
|
|
|
550 |
FT_Bool kernVariation;
|
|
|
551 |
|
|
|
552 |
FT_UNUSED( valid );
|
|
|
553 |
|
|
|
554 |
|
|
|
555 |
/* reserved bits = 0 */
|
|
|
556 |
if ( coverage & 0x1FFC )
|
|
|
557 |
return 0;
|
|
|
558 |
|
|
|
559 |
kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 );
|
|
|
560 |
kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 );
|
|
|
561 |
kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 );
|
|
|
562 |
|
|
|
563 |
*format = (FT_UShort)( coverage & 0x0003 );
|
|
|
564 |
|
|
|
565 |
GXV_TRACE(( "new Apple-dialect: "
|
|
|
566 |
"horizontal=%d, cross-stream=%d, variation=%d, format=%d\n",
|
|
|
567 |
!kernVertical, kernCrossStream, kernVariation, *format ));
|
|
|
568 |
|
|
|
569 |
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
|
|
|
570 |
|
|
|
571 |
return 1;
|
|
|
572 |
}
|
|
|
573 |
|
|
|
574 |
|
|
|
575 |
static FT_Bool
|
|
|
576 |
gxv_kern_coverage_classic_apple_validate( FT_UShort coverage,
|
|
|
577 |
FT_UShort* format,
|
|
|
578 |
GXV_Validator valid )
|
|
|
579 |
{
|
|
|
580 |
/* classic Apple-dialect */
|
|
|
581 |
FT_Bool horizontal;
|
|
|
582 |
FT_Bool cross_stream;
|
|
|
583 |
|
|
|
584 |
|
|
|
585 |
/* check expected flags, but don't check if MS-dialect is impossible */
|
|
|
586 |
if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( valid ) )
|
|
|
587 |
return 0;
|
|
|
588 |
|
|
|
589 |
/* reserved bits = 0 */
|
|
|
590 |
if ( coverage & 0x02FC )
|
|
|
591 |
return 0;
|
|
|
592 |
|
|
|
593 |
horizontal = FT_BOOL( ( coverage >> 15 ) & 1 );
|
|
|
594 |
cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 );
|
|
|
595 |
|
|
|
596 |
*format = (FT_UShort)( coverage & 0x0003 );
|
|
|
597 |
|
|
|
598 |
GXV_TRACE(( "classic Apple-dialect: "
|
|
|
599 |
"horizontal=%d, cross-stream=%d, format=%d\n",
|
|
|
600 |
horizontal, cross_stream, *format ));
|
|
|
601 |
|
|
|
602 |
/* format 1 requires GX State Machine, too new for classic */
|
|
|
603 |
if ( *format == 1 )
|
|
|
604 |
return 0;
|
|
|
605 |
|
|
|
606 |
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
|
|
|
607 |
|
|
|
608 |
return 1;
|
|
|
609 |
}
|
|
|
610 |
|
|
|
611 |
|
|
|
612 |
static FT_Bool
|
|
|
613 |
gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage,
|
|
|
614 |
FT_UShort* format,
|
|
|
615 |
GXV_Validator valid )
|
|
|
616 |
{
|
|
|
617 |
/* classic Microsoft-dialect */
|
|
|
618 |
FT_Bool horizontal;
|
|
|
619 |
FT_Bool minimum;
|
|
|
620 |
FT_Bool cross_stream;
|
|
|
621 |
FT_Bool override;
|
|
|
622 |
|
|
|
623 |
FT_UNUSED( valid );
|
|
|
624 |
|
|
|
625 |
|
|
|
626 |
/* reserved bits = 0 */
|
|
|
627 |
if ( coverage & 0xFDF0 )
|
|
|
628 |
return 0;
|
|
|
629 |
|
|
|
630 |
horizontal = FT_BOOL( coverage & 1 );
|
|
|
631 |
minimum = FT_BOOL( ( coverage >> 1 ) & 1 );
|
|
|
632 |
cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 );
|
|
|
633 |
override = FT_BOOL( ( coverage >> 3 ) & 1 );
|
|
|
634 |
|
|
|
635 |
*format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 );
|
|
|
636 |
|
|
|
637 |
GXV_TRACE(( "classic Microsoft-dialect: "
|
|
|
638 |
"horizontal=%d, minimum=%d, cross-stream=%d, "
|
|
|
639 |
"override=%d, format=%d\n",
|
|
|
640 |
horizontal, minimum, cross_stream, override, *format ));
|
|
|
641 |
|
|
|
642 |
if ( *format == 2 )
|
|
|
643 |
GXV_TRACE((
|
|
|
644 |
"kerning values in Microsoft format 2 subtable are ignored\n" ));
|
|
|
645 |
|
|
|
646 |
return 1;
|
|
|
647 |
}
|
|
|
648 |
|
|
|
649 |
|
|
|
650 |
/*************************************************************************/
|
|
|
651 |
/*************************************************************************/
|
|
|
652 |
/***** *****/
|
|
|
653 |
/***** MAIN *****/
|
|
|
654 |
/***** *****/
|
|
|
655 |
/*************************************************************************/
|
|
|
656 |
/*************************************************************************/
|
|
|
657 |
|
|
|
658 |
static GXV_kern_Dialect
|
|
|
659 |
gxv_kern_coverage_validate( FT_UShort coverage,
|
|
|
660 |
FT_UShort* format,
|
|
|
661 |
GXV_Validator valid )
|
|
|
662 |
{
|
|
|
663 |
GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN;
|
|
|
664 |
|
|
|
665 |
|
|
|
666 |
GXV_NAME_ENTER( "validating coverage" );
|
|
|
667 |
|
|
|
668 |
GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage ));
|
|
|
669 |
|
|
|
670 |
if ( KERN_IS_NEW( valid ) )
|
|
|
671 |
{
|
|
|
672 |
if ( gxv_kern_coverage_new_apple_validate( coverage,
|
|
|
673 |
format,
|
|
|
674 |
valid ) )
|
|
|
675 |
{
|
|
|
676 |
result = KERN_DIALECT_APPLE;
|
|
|
677 |
goto Exit;
|
|
|
678 |
}
|
|
|
679 |
}
|
|
|
680 |
|
|
|
681 |
if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_APPLE( valid ) )
|
|
|
682 |
{
|
|
|
683 |
if ( gxv_kern_coverage_classic_apple_validate( coverage,
|
|
|
684 |
format,
|
|
|
685 |
valid ) )
|
|
|
686 |
{
|
|
|
687 |
result = KERN_DIALECT_APPLE;
|
|
|
688 |
goto Exit;
|
|
|
689 |
}
|
|
|
690 |
}
|
|
|
691 |
|
|
|
692 |
if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_MS( valid ) )
|
|
|
693 |
{
|
|
|
694 |
if ( gxv_kern_coverage_classic_microsoft_validate( coverage,
|
|
|
695 |
format,
|
|
|
696 |
valid ) )
|
|
|
697 |
{
|
|
|
698 |
result = KERN_DIALECT_MS;
|
|
|
699 |
goto Exit;
|
|
|
700 |
}
|
|
|
701 |
}
|
|
|
702 |
|
|
|
703 |
GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" ));
|
|
|
704 |
|
|
|
705 |
Exit:
|
|
|
706 |
GXV_EXIT;
|
|
|
707 |
return result;
|
|
|
708 |
}
|
|
|
709 |
|
|
|
710 |
|
|
|
711 |
static void
|
|
|
712 |
gxv_kern_subtable_validate( FT_Bytes table,
|
|
|
713 |
FT_Bytes limit,
|
|
|
714 |
GXV_Validator valid )
|
|
|
715 |
{
|
|
|
716 |
FT_Bytes p = table;
|
|
|
717 |
FT_UShort version = 0; /* MS only: subtable version, unused */
|
|
|
718 |
FT_ULong length; /* MS: 16bit, Apple: 32bit*/
|
|
|
719 |
FT_UShort coverage;
|
|
|
720 |
FT_UShort tupleIndex = 0; /* Apple only */
|
|
|
721 |
FT_UShort u16[2];
|
|
|
722 |
FT_UShort format = 255; /* subtable format */
|
|
|
723 |
|
|
|
724 |
|
|
|
725 |
GXV_NAME_ENTER( "kern subtable" );
|
|
|
726 |
|
|
|
727 |
GXV_LIMIT_CHECK( 2 + 2 + 2 );
|
|
|
728 |
u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */
|
|
|
729 |
u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */
|
|
|
730 |
coverage = FT_NEXT_USHORT( p );
|
|
|
731 |
|
|
|
732 |
switch ( gxv_kern_coverage_validate( coverage, &format, valid ) )
|
|
|
733 |
{
|
|
|
734 |
case KERN_DIALECT_MS:
|
|
|
735 |
version = u16[0];
|
|
|
736 |
length = u16[1];
|
|
|
737 |
tupleIndex = 0;
|
|
|
738 |
GXV_TRACE(( "Subtable version = %d\n", version ));
|
|
|
739 |
GXV_TRACE(( "Subtable length = %d\n", length ));
|
|
|
740 |
break;
|
|
|
741 |
|
|
|
742 |
case KERN_DIALECT_APPLE:
|
|
|
743 |
version = 0;
|
|
|
744 |
length = ( u16[0] << 16 ) + u16[1];
|
|
|
745 |
tupleIndex = 0;
|
|
|
746 |
GXV_TRACE(( "Subtable length = %d\n", length ));
|
|
|
747 |
|
|
|
748 |
if ( KERN_IS_NEW( valid ) )
|
|
|
749 |
{
|
|
|
750 |
GXV_LIMIT_CHECK( 2 );
|
|
|
751 |
tupleIndex = FT_NEXT_USHORT( p );
|
|
|
752 |
GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex ));
|
|
|
753 |
}
|
|
|
754 |
break;
|
|
|
755 |
|
|
|
756 |
default:
|
|
|
757 |
length = u16[1];
|
|
|
758 |
GXV_TRACE(( "cannot detect subtable dialect, "
|
|
|
759 |
"just skip %d byte\n", length ));
|
|
|
760 |
goto Exit;
|
|
|
761 |
}
|
|
|
762 |
|
|
|
763 |
/* formats 1, 2, 3 require the position of the start of this subtable */
|
|
|
764 |
if ( format == 0 )
|
|
|
765 |
gxv_kern_subtable_fmt0_validate( table, table + length, valid );
|
|
|
766 |
else if ( format == 1 )
|
|
|
767 |
gxv_kern_subtable_fmt1_validate( table, table + length, valid );
|
|
|
768 |
else if ( format == 2 )
|
|
|
769 |
gxv_kern_subtable_fmt2_validate( table, table + length, valid );
|
|
|
770 |
else if ( format == 3 )
|
|
|
771 |
gxv_kern_subtable_fmt3_validate( table, table + length, valid );
|
|
|
772 |
else
|
|
|
773 |
FT_INVALID_DATA;
|
|
|
774 |
|
|
|
775 |
Exit:
|
|
|
776 |
valid->subtable_length = length;
|
|
|
777 |
GXV_EXIT;
|
|
|
778 |
}
|
|
|
779 |
|
|
|
780 |
|
|
|
781 |
/*************************************************************************/
|
|
|
782 |
/*************************************************************************/
|
|
|
783 |
/***** *****/
|
|
|
784 |
/***** kern TABLE *****/
|
|
|
785 |
/***** *****/
|
|
|
786 |
/*************************************************************************/
|
|
|
787 |
/*************************************************************************/
|
|
|
788 |
|
|
|
789 |
static void
|
|
|
790 |
gxv_kern_validate_generic( FT_Bytes table,
|
|
|
791 |
FT_Face face,
|
|
|
792 |
FT_Bool classic_only,
|
|
|
793 |
GXV_kern_Dialect dialect_request,
|
|
|
794 |
FT_Validator ftvalid )
|
|
|
795 |
{
|
|
|
796 |
GXV_ValidatorRec validrec;
|
|
|
797 |
GXV_Validator valid = &validrec;
|
|
|
798 |
|
|
|
799 |
GXV_kern_DataRec kernrec;
|
|
|
800 |
GXV_kern_Data kern = &kernrec;
|
|
|
801 |
|
|
|
802 |
FT_Bytes p = table;
|
|
|
803 |
FT_Bytes limit = 0;
|
|
|
804 |
|
|
|
805 |
FT_ULong nTables = 0;
|
|
|
806 |
FT_UInt i;
|
|
|
807 |
|
|
|
808 |
|
|
|
809 |
valid->root = ftvalid;
|
|
|
810 |
valid->table_data = kern;
|
|
|
811 |
valid->face = face;
|
|
|
812 |
|
|
|
813 |
FT_TRACE3(( "validating `kern' table\n" ));
|
|
|
814 |
GXV_INIT;
|
|
|
815 |
KERN_DIALECT( valid ) = dialect_request;
|
|
|
816 |
|
|
|
817 |
GXV_LIMIT_CHECK( 2 );
|
|
|
818 |
GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p );
|
|
|
819 |
GXV_TRACE(( "version 0x%04x (higher 16bit)\n",
|
|
|
820 |
GXV_KERN_DATA( version ) ));
|
|
|
821 |
|
|
|
822 |
if ( 0x0001 < GXV_KERN_DATA( version ) )
|
|
|
823 |
FT_INVALID_FORMAT;
|
|
|
824 |
else if ( KERN_IS_CLASSIC( valid ) )
|
|
|
825 |
{
|
|
|
826 |
GXV_LIMIT_CHECK( 2 );
|
|
|
827 |
nTables = FT_NEXT_USHORT( p );
|
|
|
828 |
}
|
|
|
829 |
else if ( KERN_IS_NEW( valid ) )
|
|
|
830 |
{
|
|
|
831 |
if ( classic_only )
|
|
|
832 |
FT_INVALID_FORMAT;
|
|
|
833 |
|
|
|
834 |
if ( 0x0000 != FT_NEXT_USHORT( p ) )
|
|
|
835 |
FT_INVALID_FORMAT;
|
|
|
836 |
|
|
|
837 |
GXV_LIMIT_CHECK( 4 );
|
|
|
838 |
nTables = FT_NEXT_ULONG( p );
|
|
|
839 |
}
|
|
|
840 |
|
|
|
841 |
for ( i = 0; i < nTables; i++ )
|
|
|
842 |
{
|
|
|
843 |
GXV_TRACE(( "validating subtable %d/%d\n", i, nTables ));
|
|
|
844 |
/* p should be 32bit-aligned? */
|
|
|
845 |
gxv_kern_subtable_validate( p, 0, valid );
|
|
|
846 |
p += valid->subtable_length;
|
|
|
847 |
}
|
|
|
848 |
|
|
|
849 |
FT_TRACE4(( "\n" ));
|
|
|
850 |
}
|
|
|
851 |
|
|
|
852 |
|
|
|
853 |
FT_LOCAL_DEF( void )
|
|
|
854 |
gxv_kern_validate( FT_Bytes table,
|
|
|
855 |
FT_Face face,
|
|
|
856 |
FT_Validator ftvalid )
|
|
|
857 |
{
|
|
|
858 |
gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid );
|
|
|
859 |
}
|
|
|
860 |
|
|
|
861 |
|
|
|
862 |
FT_LOCAL_DEF( void )
|
|
|
863 |
gxv_kern_validate_classic( FT_Bytes table,
|
|
|
864 |
FT_Face face,
|
|
|
865 |
FT_Int dialect_flags,
|
|
|
866 |
FT_Validator ftvalid )
|
|
|
867 |
{
|
|
|
868 |
GXV_kern_Dialect dialect_request;
|
|
|
869 |
|
|
|
870 |
|
|
|
871 |
dialect_request = (GXV_kern_Dialect)dialect_flags;
|
|
|
872 |
gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid );
|
|
|
873 |
}
|
|
|
874 |
|
|
|
875 |
|
|
|
876 |
/* END */
|