ref: e9c50fa77de58b749b4b95706f7b55bfff0dd27f
dir: /src/otvalid/otvjstf.c/
/****************************************************************************
*
* otvjstf.c
*
* OpenType JSTF table validation (body).
*
* Copyright (C) 2004-2021 by
* 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.
*
*/
#include "otvalid.h"
#include "otvcommn.h"
#include "otvgpos.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 otvjstf
#define JstfPriorityFunc otv_JstfPriority_validate
#define JstfLookupFunc otv_GPOS_subtable_validate
/* uses otvalid->extra1 (GSUB lookup count) */
/* uses otvalid->extra2 (GPOS lookup count) */
/* sets otvalid->extra1 (counter) */
static void
otv_JstfPriority_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt table_size;
FT_UInt gsub_lookup_count, gpos_lookup_count;
OTV_OPTIONAL_TABLE( ShrinkageEnableGSUB );
OTV_OPTIONAL_TABLE( ShrinkageDisableGSUB );
OTV_OPTIONAL_TABLE( ShrinkageEnableGPOS );
OTV_OPTIONAL_TABLE( ShrinkageDisableGPOS );
OTV_OPTIONAL_TABLE( ExtensionEnableGSUB );
OTV_OPTIONAL_TABLE( ExtensionDisableGSUB );
OTV_OPTIONAL_TABLE( ExtensionEnableGPOS );
OTV_OPTIONAL_TABLE( ExtensionDisableGPOS );
OTV_OPTIONAL_TABLE( ShrinkageJstfMax );
OTV_OPTIONAL_TABLE( ExtensionJstfMax );
OTV_ENTER;
OTV_TRACE(( "JstfPriority table\n" ));
OTV_LIMIT_CHECK( 20 );
gsub_lookup_count = otvalid->extra1;
gpos_lookup_count = otvalid->extra2;
table_size = 20;
otvalid->extra1 = gsub_lookup_count;
OTV_OPTIONAL_OFFSET( ShrinkageEnableGSUB );
OTV_SIZE_CHECK( ShrinkageEnableGSUB );
if ( ShrinkageEnableGSUB )
otv_x_ux( table + ShrinkageEnableGSUB, otvalid );
OTV_OPTIONAL_OFFSET( ShrinkageDisableGSUB );
OTV_SIZE_CHECK( ShrinkageDisableGSUB );
if ( ShrinkageDisableGSUB )
otv_x_ux( table + ShrinkageDisableGSUB, otvalid );
otvalid->extra1 = gpos_lookup_count;
OTV_OPTIONAL_OFFSET( ShrinkageEnableGPOS );
OTV_SIZE_CHECK( ShrinkageEnableGPOS );
if ( ShrinkageEnableGPOS )
otv_x_ux( table + ShrinkageEnableGPOS, otvalid );
OTV_OPTIONAL_OFFSET( ShrinkageDisableGPOS );
OTV_SIZE_CHECK( ShrinkageDisableGPOS );
if ( ShrinkageDisableGPOS )
otv_x_ux( table + ShrinkageDisableGPOS, otvalid );
OTV_OPTIONAL_OFFSET( ShrinkageJstfMax );
OTV_SIZE_CHECK( ShrinkageJstfMax );
if ( ShrinkageJstfMax )
{
/* XXX: check lookup types? */
OTV_NEST2( JstfMax, JstfLookup );
OTV_RUN( table + ShrinkageJstfMax, otvalid );
}
otvalid->extra1 = gsub_lookup_count;
OTV_OPTIONAL_OFFSET( ExtensionEnableGSUB );
OTV_SIZE_CHECK( ExtensionEnableGSUB );
if ( ExtensionEnableGSUB )
otv_x_ux( table + ExtensionEnableGSUB, otvalid );
OTV_OPTIONAL_OFFSET( ExtensionDisableGSUB );
OTV_SIZE_CHECK( ExtensionDisableGSUB );
if ( ExtensionDisableGSUB )
otv_x_ux( table + ExtensionDisableGSUB, otvalid );
otvalid->extra1 = gpos_lookup_count;
OTV_OPTIONAL_OFFSET( ExtensionEnableGPOS );
OTV_SIZE_CHECK( ExtensionEnableGPOS );
if ( ExtensionEnableGPOS )
otv_x_ux( table + ExtensionEnableGPOS, otvalid );
OTV_OPTIONAL_OFFSET( ExtensionDisableGPOS );
OTV_SIZE_CHECK( ExtensionDisableGPOS );
if ( ExtensionDisableGPOS )
otv_x_ux( table + ExtensionDisableGPOS, otvalid );
OTV_OPTIONAL_OFFSET( ExtensionJstfMax );
OTV_SIZE_CHECK( ExtensionJstfMax );
if ( ExtensionJstfMax )
{
/* XXX: check lookup types? */
OTV_NEST2( JstfMax, JstfLookup );
OTV_RUN( table + ExtensionJstfMax, otvalid );
}
otvalid->extra1 = gsub_lookup_count;
otvalid->extra2 = gpos_lookup_count;
OTV_EXIT;
}
/* sets otvalid->extra (glyph count) */
/* sets otvalid->func1 (otv_JstfPriority_validate) */
static void
otv_JstfScript_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt table_size;
FT_UInt JstfLangSysCount;
OTV_OPTIONAL_TABLE( ExtGlyph );
OTV_OPTIONAL_TABLE( DefJstfLangSys );
OTV_NAME_ENTER( "JstfScript" );
OTV_LIMIT_CHECK( 6 );
OTV_OPTIONAL_OFFSET( ExtGlyph );
OTV_OPTIONAL_OFFSET( DefJstfLangSys );
JstfLangSysCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount ));
table_size = JstfLangSysCount * 6 + 6;
OTV_SIZE_CHECK( ExtGlyph );
if ( ExtGlyph )
{
otvalid->extra1 = otvalid->glyph_count;
OTV_NEST1( ExtenderGlyph );
OTV_RUN( table + ExtGlyph, otvalid );
}
OTV_SIZE_CHECK( DefJstfLangSys );
if ( DefJstfLangSys )
{
OTV_NEST2( JstfLangSys, JstfPriority );
OTV_RUN( table + DefJstfLangSys, otvalid );
}
OTV_LIMIT_CHECK( 6 * JstfLangSysCount );
/* JstfLangSysRecord */
OTV_NEST2( JstfLangSys, JstfPriority );
for ( ; JstfLangSysCount > 0; JstfLangSysCount-- )
{
p += 4; /* skip JstfLangSysTag */
OTV_RUN( table + FT_NEXT_USHORT( p ), otvalid );
}
OTV_EXIT;
}
/* sets otvalid->extra1 (GSUB lookup count) */
/* sets otvalid->extra2 (GPOS lookup count) */
/* sets otvalid->glyph_count */
FT_LOCAL_DEF( void )
otv_JSTF_validate( FT_Bytes table,
FT_Bytes gsub,
FT_Bytes gpos,
FT_UInt glyph_count,
FT_Validator ftvalid )
{
OTV_ValidatorRec otvalidrec;
OTV_Validator otvalid = &otvalidrec;
FT_Bytes p = table;
FT_UInt JstfScriptCount;
otvalid->root = ftvalid;
FT_TRACE3(( "validating JSTF table\n" ));
OTV_INIT;
OTV_LIMIT_CHECK( 6 );
if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
FT_INVALID_FORMAT;
JstfScriptCount = FT_NEXT_USHORT( p );
FT_TRACE3(( " (JstfScriptCount = %d)\n", JstfScriptCount ));
OTV_LIMIT_CHECK( JstfScriptCount * 6 );
if ( gsub )
otvalid->extra1 = otv_GSUBGPOS_get_Lookup_count( gsub );
else
otvalid->extra1 = 0;
if ( gpos )
otvalid->extra2 = otv_GSUBGPOS_get_Lookup_count( gpos );
else
otvalid->extra2 = 0;
otvalid->glyph_count = glyph_count;
/* JstfScriptRecord */
for ( ; JstfScriptCount > 0; JstfScriptCount-- )
{
p += 4; /* skip JstfScriptTag */
/* JstfScript */
otv_JstfScript_validate( table + FT_NEXT_USHORT( p ), otvalid );
}
FT_TRACE4(( "\n" ));
}
/* END */