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5172
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/***************************************************************************/
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/* */
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/* otvgpos.c */
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/* */
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/* OpenType GPOS table validation (body). */
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/* */
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/* Copyright 2002, 2004, 2005, 2006, 2007, 2008 by */
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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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#include "otvalid.h"
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#include "otvcommn.h"
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#include "otvgpos.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_otvgpos
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33 |
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static void
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otv_Anchor_validate( FT_Bytes table,
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OTV_Validator valid );
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static void
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otv_MarkArray_validate( FT_Bytes table,
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OTV_Validator valid );
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** UTILITY FUNCTIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define BaseArrayFunc otv_x_sxy
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#define LigatureAttachFunc otv_x_sxy
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#define Mark2ArrayFunc otv_x_sxy
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/* uses valid->extra1 (counter) */
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/* uses valid->extra2 (boolean to handle NULL anchor field) */
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static void
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otv_x_sxy( FT_Bytes table,
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OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt Count, count1, table_size;
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OTV_ENTER;
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OTV_LIMIT_CHECK( 2 );
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Count = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (Count = %d)\n", Count ));
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OTV_LIMIT_CHECK( Count * valid->extra1 * 2 );
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table_size = Count * valid->extra1 * 2 + 2;
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for ( ; Count > 0; Count-- )
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for ( count1 = valid->extra1; count1 > 0; count1-- )
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{
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OTV_OPTIONAL_TABLE( anchor_offset );
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OTV_OPTIONAL_OFFSET( anchor_offset );
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if ( valid->extra2 )
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{
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OTV_SIZE_CHECK( anchor_offset );
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if ( anchor_offset )
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otv_Anchor_validate( table + anchor_offset, valid );
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}
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else
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otv_Anchor_validate( table + anchor_offset, valid );
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}
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OTV_EXIT;
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}
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#define MarkBasePosFormat1Func otv_u_O_O_u_O_O
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#define MarkLigPosFormat1Func otv_u_O_O_u_O_O
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#define MarkMarkPosFormat1Func otv_u_O_O_u_O_O
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/* sets valid->extra1 (class count) */
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static void
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otv_u_O_O_u_O_O( FT_Bytes table,
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OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt Coverage1, Coverage2, ClassCount;
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FT_UInt Array1, Array2;
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OTV_Validate_Func func;
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OTV_ENTER;
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p += 2; /* skip PosFormat */
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OTV_LIMIT_CHECK( 10 );
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Coverage1 = FT_NEXT_USHORT( p );
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Coverage2 = FT_NEXT_USHORT( p );
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ClassCount = FT_NEXT_USHORT( p );
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Array1 = FT_NEXT_USHORT( p );
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Array2 = FT_NEXT_USHORT( p );
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otv_Coverage_validate( table + Coverage1, valid, -1 );
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otv_Coverage_validate( table + Coverage2, valid, -1 );
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otv_MarkArray_validate( table + Array1, valid );
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valid->nesting_level++;
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func = valid->func[valid->nesting_level];
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valid->extra1 = ClassCount;
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func( table + Array2, valid );
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valid->nesting_level--;
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** VALUE RECORDS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static FT_UInt
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otv_value_length( FT_UInt format )
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{
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FT_UInt count;
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count = ( ( format & 0xAA ) >> 1 ) + ( format & 0x55 );
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count = ( ( count & 0xCC ) >> 2 ) + ( count & 0x33 );
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count = ( ( count & 0xF0 ) >> 4 ) + ( count & 0x0F );
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return count * 2;
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}
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/* uses valid->extra3 (pointer to base table) */
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static void
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otv_ValueRecord_validate( FT_Bytes table,
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FT_UInt format,
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OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt count;
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#ifdef FT_DEBUG_LEVEL_TRACE
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FT_Int loop;
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FT_ULong res = 0;
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180 |
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OTV_NAME_ENTER( "ValueRecord" );
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182 |
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/* display `format' in dual representation */
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for ( loop = 7; loop >= 0; loop-- )
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{
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res <<= 4;
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res += ( format >> loop ) & 1;
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}
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OTV_TRACE(( " (format 0b%08lx)\n", res ));
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#endif
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if ( format >= 0x100 )
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FT_INVALID_FORMAT;
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for ( count = 4; count > 0; count-- )
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{
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if ( format & 1 )
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{
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/* XPlacement, YPlacement, XAdvance, YAdvance */
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OTV_LIMIT_CHECK( 2 );
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p += 2;
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}
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format >>= 1;
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}
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for ( count = 4; count > 0; count-- )
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{
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if ( format & 1 )
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{
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FT_PtrDist table_size;
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OTV_OPTIONAL_TABLE( device );
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215 |
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216 |
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/* XPlaDevice, YPlaDevice, XAdvDevice, YAdvDevice */
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OTV_LIMIT_CHECK( 2 );
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OTV_OPTIONAL_OFFSET( device );
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/* XXX: this value is usually too small, especially if the current */
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/* ValueRecord is part of an array -- getting the correct table */
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/* size is probably not worth the trouble */
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table_size = p - valid->extra3;
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OTV_SIZE_CHECK( device );
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if ( device )
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otv_Device_validate( valid->extra3 + device, valid );
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}
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format >>= 1;
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** ANCHORS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_Anchor_validate( FT_Bytes table,
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OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt AnchorFormat;
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253 |
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OTV_NAME_ENTER( "Anchor");
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OTV_LIMIT_CHECK( 6 );
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AnchorFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", AnchorFormat ));
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260 |
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p += 4; /* skip XCoordinate and YCoordinate */
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switch ( AnchorFormat )
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{
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case 1:
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break;
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case 2:
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OTV_LIMIT_CHECK( 2 ); /* AnchorPoint */
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break;
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case 3:
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{
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FT_UInt table_size;
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275 |
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OTV_OPTIONAL_TABLE( XDeviceTable );
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OTV_OPTIONAL_TABLE( YDeviceTable );
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278 |
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279 |
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OTV_LIMIT_CHECK( 4 );
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OTV_OPTIONAL_OFFSET( XDeviceTable );
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OTV_OPTIONAL_OFFSET( YDeviceTable );
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283 |
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table_size = 6 + 4;
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285 |
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OTV_SIZE_CHECK( XDeviceTable );
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if ( XDeviceTable )
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otv_Device_validate( table + XDeviceTable, valid );
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OTV_SIZE_CHECK( YDeviceTable );
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if ( YDeviceTable )
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otv_Device_validate( table + YDeviceTable, valid );
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}
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break;
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default:
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FT_INVALID_FORMAT;
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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305 |
/*************************************************************************/
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306 |
/***** *****/
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307 |
/***** MARK ARRAYS *****/
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308 |
/***** *****/
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309 |
/*************************************************************************/
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310 |
/*************************************************************************/
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311 |
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312 |
static void
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313 |
otv_MarkArray_validate( FT_Bytes table,
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314 |
OTV_Validator valid )
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315 |
{
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FT_Bytes p = table;
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FT_UInt MarkCount;
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318 |
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319 |
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320 |
OTV_NAME_ENTER( "MarkArray" );
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321 |
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322 |
OTV_LIMIT_CHECK( 2 );
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323 |
MarkCount = FT_NEXT_USHORT( p );
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324 |
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325 |
OTV_TRACE(( " (MarkCount = %d)\n", MarkCount ));
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326 |
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327 |
OTV_LIMIT_CHECK( MarkCount * 4 );
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328 |
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329 |
/* MarkRecord */
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330 |
for ( ; MarkCount > 0; MarkCount-- )
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{
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332 |
p += 2; /* skip Class */
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333 |
/* MarkAnchor */
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otv_Anchor_validate( table + FT_NEXT_USHORT( p ), valid );
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335 |
}
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336 |
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337 |
OTV_EXIT;
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338 |
}
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339 |
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340 |
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341 |
/*************************************************************************/
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342 |
/*************************************************************************/
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343 |
/***** *****/
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344 |
/***** GPOS LOOKUP TYPE 1 *****/
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345 |
/***** *****/
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346 |
/*************************************************************************/
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347 |
/*************************************************************************/
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348 |
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349 |
/* sets valid->extra3 (pointer to base table) */
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350 |
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351 |
static void
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352 |
otv_SinglePos_validate( FT_Bytes table,
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353 |
OTV_Validator valid )
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354 |
{
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355 |
FT_Bytes p = table;
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356 |
FT_UInt PosFormat;
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357 |
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358 |
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359 |
OTV_NAME_ENTER( "SinglePos" );
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360 |
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361 |
OTV_LIMIT_CHECK( 2 );
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362 |
PosFormat = FT_NEXT_USHORT( p );
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363 |
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364 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
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365 |
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366 |
valid->extra3 = table;
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367 |
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368 |
switch ( PosFormat )
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369 |
{
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370 |
case 1: /* SinglePosFormat1 */
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371 |
{
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372 |
FT_UInt Coverage, ValueFormat;
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373 |
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374 |
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375 |
OTV_LIMIT_CHECK( 4 );
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376 |
Coverage = FT_NEXT_USHORT( p );
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377 |
ValueFormat = FT_NEXT_USHORT( p );
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378 |
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379 |
otv_Coverage_validate( table + Coverage, valid, -1 );
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380 |
otv_ValueRecord_validate( p, ValueFormat, valid ); /* Value */
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381 |
}
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382 |
break;
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383 |
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384 |
case 2: /* SinglePosFormat2 */
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385 |
{
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386 |
FT_UInt Coverage, ValueFormat, ValueCount, len_value;
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387 |
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388 |
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389 |
OTV_LIMIT_CHECK( 6 );
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390 |
Coverage = FT_NEXT_USHORT( p );
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391 |
ValueFormat = FT_NEXT_USHORT( p );
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392 |
ValueCount = FT_NEXT_USHORT( p );
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393 |
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394 |
OTV_TRACE(( " (ValueCount = %d)\n", ValueCount ));
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395 |
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396 |
len_value = otv_value_length( ValueFormat );
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397 |
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398 |
otv_Coverage_validate( table + Coverage, valid, ValueCount );
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399 |
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400 |
OTV_LIMIT_CHECK( ValueCount * len_value );
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401 |
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402 |
/* Value */
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403 |
for ( ; ValueCount > 0; ValueCount-- )
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404 |
{
|
|
|
405 |
otv_ValueRecord_validate( p, ValueFormat, valid );
|
|
|
406 |
p += len_value;
|
|
|
407 |
}
|
|
|
408 |
}
|
|
|
409 |
break;
|
|
|
410 |
|
|
|
411 |
default:
|
|
|
412 |
FT_INVALID_FORMAT;
|
|
|
413 |
}
|
|
|
414 |
|
|
|
415 |
OTV_EXIT;
|
|
|
416 |
}
|
|
|
417 |
|
|
|
418 |
|
|
|
419 |
/*************************************************************************/
|
|
|
420 |
/*************************************************************************/
|
|
|
421 |
/***** *****/
|
|
|
422 |
/***** GPOS LOOKUP TYPE 2 *****/
|
|
|
423 |
/***** *****/
|
|
|
424 |
/*************************************************************************/
|
|
|
425 |
/*************************************************************************/
|
|
|
426 |
|
|
|
427 |
static void
|
|
|
428 |
otv_PairSet_validate( FT_Bytes table,
|
|
|
429 |
FT_UInt format1,
|
|
|
430 |
FT_UInt format2,
|
|
|
431 |
OTV_Validator valid )
|
|
|
432 |
{
|
|
|
433 |
FT_Bytes p = table;
|
|
|
434 |
FT_UInt value_len1, value_len2, PairValueCount;
|
|
|
435 |
|
|
|
436 |
|
|
|
437 |
OTV_NAME_ENTER( "PairSet" );
|
|
|
438 |
|
|
|
439 |
OTV_LIMIT_CHECK( 2 );
|
|
|
440 |
PairValueCount = FT_NEXT_USHORT( p );
|
|
|
441 |
|
|
|
442 |
OTV_TRACE(( " (PairValueCount = %d)\n", PairValueCount ));
|
|
|
443 |
|
|
|
444 |
value_len1 = otv_value_length( format1 );
|
|
|
445 |
value_len2 = otv_value_length( format2 );
|
|
|
446 |
|
|
|
447 |
OTV_LIMIT_CHECK( PairValueCount * ( value_len1 + value_len2 + 2 ) );
|
|
|
448 |
|
|
|
449 |
/* PairValueRecord */
|
|
|
450 |
for ( ; PairValueCount > 0; PairValueCount-- )
|
|
|
451 |
{
|
|
|
452 |
p += 2; /* skip SecondGlyph */
|
|
|
453 |
|
|
|
454 |
if ( format1 )
|
|
|
455 |
otv_ValueRecord_validate( p, format1, valid ); /* Value1 */
|
|
|
456 |
p += value_len1;
|
|
|
457 |
|
|
|
458 |
if ( format2 )
|
|
|
459 |
otv_ValueRecord_validate( p, format2, valid ); /* Value2 */
|
|
|
460 |
p += value_len2;
|
|
|
461 |
}
|
|
|
462 |
|
|
|
463 |
OTV_EXIT;
|
|
|
464 |
}
|
|
|
465 |
|
|
|
466 |
|
|
|
467 |
/* sets valid->extra3 (pointer to base table) */
|
|
|
468 |
|
|
|
469 |
static void
|
|
|
470 |
otv_PairPos_validate( FT_Bytes table,
|
|
|
471 |
OTV_Validator valid )
|
|
|
472 |
{
|
|
|
473 |
FT_Bytes p = table;
|
|
|
474 |
FT_UInt PosFormat;
|
|
|
475 |
|
|
|
476 |
|
|
|
477 |
OTV_NAME_ENTER( "PairPos" );
|
|
|
478 |
|
|
|
479 |
OTV_LIMIT_CHECK( 2 );
|
|
|
480 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
481 |
|
|
|
482 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
483 |
|
|
|
484 |
valid->extra3 = table;
|
|
|
485 |
|
|
|
486 |
switch ( PosFormat )
|
|
|
487 |
{
|
|
|
488 |
case 1: /* PairPosFormat1 */
|
|
|
489 |
{
|
|
|
490 |
FT_UInt Coverage, ValueFormat1, ValueFormat2, PairSetCount;
|
|
|
491 |
|
|
|
492 |
|
|
|
493 |
OTV_LIMIT_CHECK( 8 );
|
|
|
494 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
495 |
ValueFormat1 = FT_NEXT_USHORT( p );
|
|
|
496 |
ValueFormat2 = FT_NEXT_USHORT( p );
|
|
|
497 |
PairSetCount = FT_NEXT_USHORT( p );
|
|
|
498 |
|
|
|
499 |
OTV_TRACE(( " (PairSetCount = %d)\n", PairSetCount ));
|
|
|
500 |
|
|
|
501 |
otv_Coverage_validate( table + Coverage, valid, -1 );
|
|
|
502 |
|
|
|
503 |
OTV_LIMIT_CHECK( PairSetCount * 2 );
|
|
|
504 |
|
|
|
505 |
/* PairSetOffset */
|
|
|
506 |
for ( ; PairSetCount > 0; PairSetCount-- )
|
|
|
507 |
otv_PairSet_validate( table + FT_NEXT_USHORT( p ),
|
|
|
508 |
ValueFormat1, ValueFormat2, valid );
|
|
|
509 |
}
|
|
|
510 |
break;
|
|
|
511 |
|
|
|
512 |
case 2: /* PairPosFormat2 */
|
|
|
513 |
{
|
|
|
514 |
FT_UInt Coverage, ValueFormat1, ValueFormat2, ClassDef1, ClassDef2;
|
|
|
515 |
FT_UInt ClassCount1, ClassCount2, len_value1, len_value2, count;
|
|
|
516 |
|
|
|
517 |
|
|
|
518 |
OTV_LIMIT_CHECK( 14 );
|
|
|
519 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
520 |
ValueFormat1 = FT_NEXT_USHORT( p );
|
|
|
521 |
ValueFormat2 = FT_NEXT_USHORT( p );
|
|
|
522 |
ClassDef1 = FT_NEXT_USHORT( p );
|
|
|
523 |
ClassDef2 = FT_NEXT_USHORT( p );
|
|
|
524 |
ClassCount1 = FT_NEXT_USHORT( p );
|
|
|
525 |
ClassCount2 = FT_NEXT_USHORT( p );
|
|
|
526 |
|
|
|
527 |
OTV_TRACE(( " (ClassCount1 = %d)\n", ClassCount1 ));
|
|
|
528 |
OTV_TRACE(( " (ClassCount2 = %d)\n", ClassCount2 ));
|
|
|
529 |
|
|
|
530 |
len_value1 = otv_value_length( ValueFormat1 );
|
|
|
531 |
len_value2 = otv_value_length( ValueFormat2 );
|
|
|
532 |
|
|
|
533 |
otv_Coverage_validate( table + Coverage, valid, -1 );
|
|
|
534 |
otv_ClassDef_validate( table + ClassDef1, valid );
|
|
|
535 |
otv_ClassDef_validate( table + ClassDef2, valid );
|
|
|
536 |
|
|
|
537 |
OTV_LIMIT_CHECK( ClassCount1 * ClassCount2 *
|
|
|
538 |
( len_value1 + len_value2 ) );
|
|
|
539 |
|
|
|
540 |
/* Class1Record */
|
|
|
541 |
for ( ; ClassCount1 > 0; ClassCount1-- )
|
|
|
542 |
{
|
|
|
543 |
/* Class2Record */
|
|
|
544 |
for ( count = ClassCount2; count > 0; count-- )
|
|
|
545 |
{
|
|
|
546 |
if ( ValueFormat1 )
|
|
|
547 |
/* Value1 */
|
|
|
548 |
otv_ValueRecord_validate( p, ValueFormat1, valid );
|
|
|
549 |
p += len_value1;
|
|
|
550 |
|
|
|
551 |
if ( ValueFormat2 )
|
|
|
552 |
/* Value2 */
|
|
|
553 |
otv_ValueRecord_validate( p, ValueFormat2, valid );
|
|
|
554 |
p += len_value2;
|
|
|
555 |
}
|
|
|
556 |
}
|
|
|
557 |
}
|
|
|
558 |
break;
|
|
|
559 |
|
|
|
560 |
default:
|
|
|
561 |
FT_INVALID_FORMAT;
|
|
|
562 |
}
|
|
|
563 |
|
|
|
564 |
OTV_EXIT;
|
|
|
565 |
}
|
|
|
566 |
|
|
|
567 |
|
|
|
568 |
/*************************************************************************/
|
|
|
569 |
/*************************************************************************/
|
|
|
570 |
/***** *****/
|
|
|
571 |
/***** GPOS LOOKUP TYPE 3 *****/
|
|
|
572 |
/***** *****/
|
|
|
573 |
/*************************************************************************/
|
|
|
574 |
/*************************************************************************/
|
|
|
575 |
|
|
|
576 |
static void
|
|
|
577 |
otv_CursivePos_validate( FT_Bytes table,
|
|
|
578 |
OTV_Validator valid )
|
|
|
579 |
{
|
|
|
580 |
FT_Bytes p = table;
|
|
|
581 |
FT_UInt PosFormat;
|
|
|
582 |
|
|
|
583 |
|
|
|
584 |
OTV_NAME_ENTER( "CursivePos" );
|
|
|
585 |
|
|
|
586 |
OTV_LIMIT_CHECK( 2 );
|
|
|
587 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
588 |
|
|
|
589 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
590 |
|
|
|
591 |
switch ( PosFormat )
|
|
|
592 |
{
|
|
|
593 |
case 1: /* CursivePosFormat1 */
|
|
|
594 |
{
|
|
|
595 |
FT_UInt table_size;
|
|
|
596 |
FT_UInt Coverage, EntryExitCount;
|
|
|
597 |
|
|
|
598 |
OTV_OPTIONAL_TABLE( EntryAnchor );
|
|
|
599 |
OTV_OPTIONAL_TABLE( ExitAnchor );
|
|
|
600 |
|
|
|
601 |
|
|
|
602 |
OTV_LIMIT_CHECK( 4 );
|
|
|
603 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
604 |
EntryExitCount = FT_NEXT_USHORT( p );
|
|
|
605 |
|
|
|
606 |
OTV_TRACE(( " (EntryExitCount = %d)\n", EntryExitCount ));
|
|
|
607 |
|
|
|
608 |
otv_Coverage_validate( table + Coverage, valid, EntryExitCount );
|
|
|
609 |
|
|
|
610 |
OTV_LIMIT_CHECK( EntryExitCount * 4 );
|
|
|
611 |
|
|
|
612 |
table_size = EntryExitCount * 4 + 4;
|
|
|
613 |
|
|
|
614 |
/* EntryExitRecord */
|
|
|
615 |
for ( ; EntryExitCount > 0; EntryExitCount-- )
|
|
|
616 |
{
|
|
|
617 |
OTV_OPTIONAL_OFFSET( EntryAnchor );
|
|
|
618 |
OTV_OPTIONAL_OFFSET( ExitAnchor );
|
|
|
619 |
|
|
|
620 |
OTV_SIZE_CHECK( EntryAnchor );
|
|
|
621 |
if ( EntryAnchor )
|
|
|
622 |
otv_Anchor_validate( table + EntryAnchor, valid );
|
|
|
623 |
|
|
|
624 |
OTV_SIZE_CHECK( ExitAnchor );
|
|
|
625 |
if ( ExitAnchor )
|
|
|
626 |
otv_Anchor_validate( table + ExitAnchor, valid );
|
|
|
627 |
}
|
|
|
628 |
}
|
|
|
629 |
break;
|
|
|
630 |
|
|
|
631 |
default:
|
|
|
632 |
FT_INVALID_FORMAT;
|
|
|
633 |
}
|
|
|
634 |
|
|
|
635 |
OTV_EXIT;
|
|
|
636 |
}
|
|
|
637 |
|
|
|
638 |
|
|
|
639 |
/*************************************************************************/
|
|
|
640 |
/*************************************************************************/
|
|
|
641 |
/***** *****/
|
|
|
642 |
/***** GPOS LOOKUP TYPE 4 *****/
|
|
|
643 |
/***** *****/
|
|
|
644 |
/*************************************************************************/
|
|
|
645 |
/*************************************************************************/
|
|
|
646 |
|
|
|
647 |
/* UNDOCUMENTED (in OpenType 1.5): */
|
|
|
648 |
/* BaseRecord tables can contain NULL pointers. */
|
|
|
649 |
|
|
|
650 |
/* sets valid->extra2 (1) */
|
|
|
651 |
|
|
|
652 |
static void
|
|
|
653 |
otv_MarkBasePos_validate( FT_Bytes table,
|
|
|
654 |
OTV_Validator valid )
|
|
|
655 |
{
|
|
|
656 |
FT_Bytes p = table;
|
|
|
657 |
FT_UInt PosFormat;
|
|
|
658 |
|
|
|
659 |
|
|
|
660 |
OTV_NAME_ENTER( "MarkBasePos" );
|
|
|
661 |
|
|
|
662 |
OTV_LIMIT_CHECK( 2 );
|
|
|
663 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
664 |
|
|
|
665 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
666 |
|
|
|
667 |
switch ( PosFormat )
|
|
|
668 |
{
|
|
|
669 |
case 1:
|
|
|
670 |
valid->extra2 = 1;
|
|
|
671 |
OTV_NEST2( MarkBasePosFormat1, BaseArray );
|
|
|
672 |
OTV_RUN( table, valid );
|
|
|
673 |
break;
|
|
|
674 |
|
|
|
675 |
default:
|
|
|
676 |
FT_INVALID_FORMAT;
|
|
|
677 |
}
|
|
|
678 |
|
|
|
679 |
OTV_EXIT;
|
|
|
680 |
}
|
|
|
681 |
|
|
|
682 |
|
|
|
683 |
/*************************************************************************/
|
|
|
684 |
/*************************************************************************/
|
|
|
685 |
/***** *****/
|
|
|
686 |
/***** GPOS LOOKUP TYPE 5 *****/
|
|
|
687 |
/***** *****/
|
|
|
688 |
/*************************************************************************/
|
|
|
689 |
/*************************************************************************/
|
|
|
690 |
|
|
|
691 |
/* sets valid->extra2 (1) */
|
|
|
692 |
|
|
|
693 |
static void
|
|
|
694 |
otv_MarkLigPos_validate( FT_Bytes table,
|
|
|
695 |
OTV_Validator valid )
|
|
|
696 |
{
|
|
|
697 |
FT_Bytes p = table;
|
|
|
698 |
FT_UInt PosFormat;
|
|
|
699 |
|
|
|
700 |
|
|
|
701 |
OTV_NAME_ENTER( "MarkLigPos" );
|
|
|
702 |
|
|
|
703 |
OTV_LIMIT_CHECK( 2 );
|
|
|
704 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
705 |
|
|
|
706 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
707 |
|
|
|
708 |
switch ( PosFormat )
|
|
|
709 |
{
|
|
|
710 |
case 1:
|
|
|
711 |
valid->extra2 = 1;
|
|
|
712 |
OTV_NEST3( MarkLigPosFormat1, LigatureArray, LigatureAttach );
|
|
|
713 |
OTV_RUN( table, valid );
|
|
|
714 |
break;
|
|
|
715 |
|
|
|
716 |
default:
|
|
|
717 |
FT_INVALID_FORMAT;
|
|
|
718 |
}
|
|
|
719 |
|
|
|
720 |
OTV_EXIT;
|
|
|
721 |
}
|
|
|
722 |
|
|
|
723 |
|
|
|
724 |
/*************************************************************************/
|
|
|
725 |
/*************************************************************************/
|
|
|
726 |
/***** *****/
|
|
|
727 |
/***** GPOS LOOKUP TYPE 6 *****/
|
|
|
728 |
/***** *****/
|
|
|
729 |
/*************************************************************************/
|
|
|
730 |
/*************************************************************************/
|
|
|
731 |
|
|
|
732 |
/* sets valid->extra2 (0) */
|
|
|
733 |
|
|
|
734 |
static void
|
|
|
735 |
otv_MarkMarkPos_validate( FT_Bytes table,
|
|
|
736 |
OTV_Validator valid )
|
|
|
737 |
{
|
|
|
738 |
FT_Bytes p = table;
|
|
|
739 |
FT_UInt PosFormat;
|
|
|
740 |
|
|
|
741 |
|
|
|
742 |
OTV_NAME_ENTER( "MarkMarkPos" );
|
|
|
743 |
|
|
|
744 |
OTV_LIMIT_CHECK( 2 );
|
|
|
745 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
746 |
|
|
|
747 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
748 |
|
|
|
749 |
switch ( PosFormat )
|
|
|
750 |
{
|
|
|
751 |
case 1:
|
|
|
752 |
valid->extra2 = 0;
|
|
|
753 |
OTV_NEST2( MarkMarkPosFormat1, Mark2Array );
|
|
|
754 |
OTV_RUN( table, valid );
|
|
|
755 |
break;
|
|
|
756 |
|
|
|
757 |
default:
|
|
|
758 |
FT_INVALID_FORMAT;
|
|
|
759 |
}
|
|
|
760 |
|
|
|
761 |
OTV_EXIT;
|
|
|
762 |
}
|
|
|
763 |
|
|
|
764 |
|
|
|
765 |
/*************************************************************************/
|
|
|
766 |
/*************************************************************************/
|
|
|
767 |
/***** *****/
|
|
|
768 |
/***** GPOS LOOKUP TYPE 7 *****/
|
|
|
769 |
/***** *****/
|
|
|
770 |
/*************************************************************************/
|
|
|
771 |
/*************************************************************************/
|
|
|
772 |
|
|
|
773 |
/* sets valid->extra1 (lookup count) */
|
|
|
774 |
|
|
|
775 |
static void
|
|
|
776 |
otv_ContextPos_validate( FT_Bytes table,
|
|
|
777 |
OTV_Validator valid )
|
|
|
778 |
{
|
|
|
779 |
FT_Bytes p = table;
|
|
|
780 |
FT_UInt PosFormat;
|
|
|
781 |
|
|
|
782 |
|
|
|
783 |
OTV_NAME_ENTER( "ContextPos" );
|
|
|
784 |
|
|
|
785 |
OTV_LIMIT_CHECK( 2 );
|
|
|
786 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
787 |
|
|
|
788 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
789 |
|
|
|
790 |
switch ( PosFormat )
|
|
|
791 |
{
|
|
|
792 |
case 1:
|
|
|
793 |
/* no need to check glyph indices/classes used as input for these */
|
|
|
794 |
/* context rules since even invalid glyph indices/classes return */
|
|
|
795 |
/* meaningful results */
|
|
|
796 |
|
|
|
797 |
valid->extra1 = valid->lookup_count;
|
|
|
798 |
OTV_NEST3( ContextPosFormat1, PosRuleSet, PosRule );
|
|
|
799 |
OTV_RUN( table, valid );
|
|
|
800 |
break;
|
|
|
801 |
|
|
|
802 |
case 2:
|
|
|
803 |
/* no need to check glyph indices/classes used as input for these */
|
|
|
804 |
/* context rules since even invalid glyph indices/classes return */
|
|
|
805 |
/* meaningful results */
|
|
|
806 |
|
|
|
807 |
OTV_NEST3( ContextPosFormat2, PosClassSet, PosClassRule );
|
|
|
808 |
OTV_RUN( table, valid );
|
|
|
809 |
break;
|
|
|
810 |
|
|
|
811 |
case 3:
|
|
|
812 |
OTV_NEST1( ContextPosFormat3 );
|
|
|
813 |
OTV_RUN( table, valid );
|
|
|
814 |
break;
|
|
|
815 |
|
|
|
816 |
default:
|
|
|
817 |
FT_INVALID_FORMAT;
|
|
|
818 |
}
|
|
|
819 |
|
|
|
820 |
OTV_EXIT;
|
|
|
821 |
}
|
|
|
822 |
|
|
|
823 |
|
|
|
824 |
/*************************************************************************/
|
|
|
825 |
/*************************************************************************/
|
|
|
826 |
/***** *****/
|
|
|
827 |
/***** GPOS LOOKUP TYPE 8 *****/
|
|
|
828 |
/***** *****/
|
|
|
829 |
/*************************************************************************/
|
|
|
830 |
/*************************************************************************/
|
|
|
831 |
|
|
|
832 |
/* sets valid->extra1 (lookup count) */
|
|
|
833 |
|
|
|
834 |
static void
|
|
|
835 |
otv_ChainContextPos_validate( FT_Bytes table,
|
|
|
836 |
OTV_Validator valid )
|
|
|
837 |
{
|
|
|
838 |
FT_Bytes p = table;
|
|
|
839 |
FT_UInt PosFormat;
|
|
|
840 |
|
|
|
841 |
|
|
|
842 |
OTV_NAME_ENTER( "ChainContextPos" );
|
|
|
843 |
|
|
|
844 |
OTV_LIMIT_CHECK( 2 );
|
|
|
845 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
846 |
|
|
|
847 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
848 |
|
|
|
849 |
switch ( PosFormat )
|
|
|
850 |
{
|
|
|
851 |
case 1:
|
|
|
852 |
/* no need to check glyph indices/classes used as input for these */
|
|
|
853 |
/* context rules since even invalid glyph indices/classes return */
|
|
|
854 |
/* meaningful results */
|
|
|
855 |
|
|
|
856 |
valid->extra1 = valid->lookup_count;
|
|
|
857 |
OTV_NEST3( ChainContextPosFormat1,
|
|
|
858 |
ChainPosRuleSet, ChainPosRule );
|
|
|
859 |
OTV_RUN( table, valid );
|
|
|
860 |
break;
|
|
|
861 |
|
|
|
862 |
case 2:
|
|
|
863 |
/* no need to check glyph indices/classes used as input for these */
|
|
|
864 |
/* context rules since even invalid glyph indices/classes return */
|
|
|
865 |
/* meaningful results */
|
|
|
866 |
|
|
|
867 |
OTV_NEST3( ChainContextPosFormat2,
|
|
|
868 |
ChainPosClassSet, ChainPosClassRule );
|
|
|
869 |
OTV_RUN( table, valid );
|
|
|
870 |
break;
|
|
|
871 |
|
|
|
872 |
case 3:
|
|
|
873 |
OTV_NEST1( ChainContextPosFormat3 );
|
|
|
874 |
OTV_RUN( table, valid );
|
|
|
875 |
break;
|
|
|
876 |
|
|
|
877 |
default:
|
|
|
878 |
FT_INVALID_FORMAT;
|
|
|
879 |
}
|
|
|
880 |
|
|
|
881 |
OTV_EXIT;
|
|
|
882 |
}
|
|
|
883 |
|
|
|
884 |
|
|
|
885 |
/*************************************************************************/
|
|
|
886 |
/*************************************************************************/
|
|
|
887 |
/***** *****/
|
|
|
888 |
/***** GPOS LOOKUP TYPE 9 *****/
|
|
|
889 |
/***** *****/
|
|
|
890 |
/*************************************************************************/
|
|
|
891 |
/*************************************************************************/
|
|
|
892 |
|
|
|
893 |
/* uses valid->type_funcs */
|
|
|
894 |
|
|
|
895 |
static void
|
|
|
896 |
otv_ExtensionPos_validate( FT_Bytes table,
|
|
|
897 |
OTV_Validator valid )
|
|
|
898 |
{
|
|
|
899 |
FT_Bytes p = table;
|
|
|
900 |
FT_UInt PosFormat;
|
|
|
901 |
|
|
|
902 |
|
|
|
903 |
OTV_NAME_ENTER( "ExtensionPos" );
|
|
|
904 |
|
|
|
905 |
OTV_LIMIT_CHECK( 2 );
|
|
|
906 |
PosFormat = FT_NEXT_USHORT( p );
|
|
|
907 |
|
|
|
908 |
OTV_TRACE(( " (format %d)\n", PosFormat ));
|
|
|
909 |
|
|
|
910 |
switch ( PosFormat )
|
|
|
911 |
{
|
|
|
912 |
case 1: /* ExtensionPosFormat1 */
|
|
|
913 |
{
|
|
|
914 |
FT_UInt ExtensionLookupType;
|
|
|
915 |
FT_ULong ExtensionOffset;
|
|
|
916 |
OTV_Validate_Func validate;
|
|
|
917 |
|
|
|
918 |
|
|
|
919 |
OTV_LIMIT_CHECK( 6 );
|
|
|
920 |
ExtensionLookupType = FT_NEXT_USHORT( p );
|
|
|
921 |
ExtensionOffset = FT_NEXT_ULONG( p );
|
|
|
922 |
|
|
|
923 |
if ( ExtensionLookupType == 0 || ExtensionLookupType >= 9 )
|
|
|
924 |
FT_INVALID_DATA;
|
|
|
925 |
|
|
|
926 |
validate = valid->type_funcs[ExtensionLookupType - 1];
|
|
|
927 |
validate( table + ExtensionOffset, valid );
|
|
|
928 |
}
|
|
|
929 |
break;
|
|
|
930 |
|
|
|
931 |
default:
|
|
|
932 |
FT_INVALID_FORMAT;
|
|
|
933 |
}
|
|
|
934 |
|
|
|
935 |
OTV_EXIT;
|
|
|
936 |
}
|
|
|
937 |
|
|
|
938 |
|
|
|
939 |
static const OTV_Validate_Func otv_gpos_validate_funcs[9] =
|
|
|
940 |
{
|
|
|
941 |
otv_SinglePos_validate,
|
|
|
942 |
otv_PairPos_validate,
|
|
|
943 |
otv_CursivePos_validate,
|
|
|
944 |
otv_MarkBasePos_validate,
|
|
|
945 |
otv_MarkLigPos_validate,
|
|
|
946 |
otv_MarkMarkPos_validate,
|
|
|
947 |
otv_ContextPos_validate,
|
|
|
948 |
otv_ChainContextPos_validate,
|
|
|
949 |
otv_ExtensionPos_validate
|
|
|
950 |
};
|
|
|
951 |
|
|
|
952 |
|
|
|
953 |
/* sets valid->type_count */
|
|
|
954 |
/* sets valid->type_funcs */
|
|
|
955 |
|
|
|
956 |
FT_LOCAL_DEF( void )
|
|
|
957 |
otv_GPOS_subtable_validate( FT_Bytes table,
|
|
|
958 |
OTV_Validator valid )
|
|
|
959 |
{
|
|
|
960 |
valid->type_count = 9;
|
|
|
961 |
valid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs;
|
|
|
962 |
|
|
|
963 |
otv_Lookup_validate( table, valid );
|
|
|
964 |
}
|
|
|
965 |
|
|
|
966 |
|
|
|
967 |
/*************************************************************************/
|
|
|
968 |
/*************************************************************************/
|
|
|
969 |
/***** *****/
|
|
|
970 |
/***** GPOS TABLE *****/
|
|
|
971 |
/***** *****/
|
|
|
972 |
/*************************************************************************/
|
|
|
973 |
/*************************************************************************/
|
|
|
974 |
|
|
|
975 |
/* sets valid->glyph_count */
|
|
|
976 |
|
|
|
977 |
FT_LOCAL_DEF( void )
|
|
|
978 |
otv_GPOS_validate( FT_Bytes table,
|
|
|
979 |
FT_UInt glyph_count,
|
|
|
980 |
FT_Validator ftvalid )
|
|
|
981 |
{
|
|
|
982 |
OTV_ValidatorRec validrec;
|
|
|
983 |
OTV_Validator valid = &validrec;
|
|
|
984 |
FT_Bytes p = table;
|
|
|
985 |
FT_UInt ScriptList, FeatureList, LookupList;
|
|
|
986 |
|
|
|
987 |
|
|
|
988 |
valid->root = ftvalid;
|
|
|
989 |
|
|
|
990 |
FT_TRACE3(( "validating GPOS table\n" ));
|
|
|
991 |
OTV_INIT;
|
|
|
992 |
|
|
|
993 |
OTV_LIMIT_CHECK( 10 );
|
|
|
994 |
|
|
|
995 |
if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
|
|
|
996 |
FT_INVALID_FORMAT;
|
|
|
997 |
|
|
|
998 |
ScriptList = FT_NEXT_USHORT( p );
|
|
|
999 |
FeatureList = FT_NEXT_USHORT( p );
|
|
|
1000 |
LookupList = FT_NEXT_USHORT( p );
|
|
|
1001 |
|
|
|
1002 |
valid->type_count = 9;
|
|
|
1003 |
valid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs;
|
|
|
1004 |
valid->glyph_count = glyph_count;
|
|
|
1005 |
|
|
|
1006 |
otv_LookupList_validate( table + LookupList,
|
|
|
1007 |
valid );
|
|
|
1008 |
otv_FeatureList_validate( table + FeatureList, table + LookupList,
|
|
|
1009 |
valid );
|
|
|
1010 |
otv_ScriptList_validate( table + ScriptList, table + FeatureList,
|
|
|
1011 |
valid );
|
|
|
1012 |
|
|
|
1013 |
FT_TRACE4(( "\n" ));
|
|
|
1014 |
}
|
|
|
1015 |
|
|
|
1016 |
|
|
|
1017 |
/* END */
|