static void
otv_ChainContextSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "ChainContextSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
otvalid->extra1 = otvalid->lookup_count;
OTV_NEST3( ChainContextSubstFormat1,
ChainSubRuleSet, ChainSubRule );
OTV_RUN( table, otvalid );
break;
case 2:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
OTV_NEST3( ChainContextSubstFormat2,
ChainSubClassSet, ChainSubClassRule );
OTV_RUN( table, otvalid );
break;
case 3:
OTV_NEST1( ChainContextSubstFormat3 );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
static void
otv_LigatureSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "LigatureSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1:
OTV_NEST3( LigatureSubstFormat1, LigatureSet, Ligature );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
otv_GDEF_validate( FT_Bytes table,
FT_Bytes gsub,
FT_Bytes gpos,
FT_Validator ftvalid )
{
OTV_ValidatorRec validrec;
OTV_Validator valid = &validrec;
FT_Bytes p = table;
FT_UInt table_size;
FT_Bool need_MarkAttachClassDef;
OTV_OPTIONAL_TABLE( GlyphClassDef );
OTV_OPTIONAL_TABLE( AttachListOffset );
OTV_OPTIONAL_TABLE( LigCaretListOffset );
OTV_OPTIONAL_TABLE( MarkAttachClassDef );
valid->root = ftvalid;
FT_TRACE3(( "validating GDEF table\n" ));
OTV_INIT;
OTV_LIMIT_CHECK( 12 );
if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
FT_INVALID_FORMAT;
/* MarkAttachClassDef has been added to the OpenType */
/* specification without increasing GDEF's version, */
/* so we use this ugly hack to find out whether the */
/* table is needed actually. */
need_MarkAttachClassDef = FT_BOOL(
otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) ||
otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) );
if ( need_MarkAttachClassDef )
table_size = 12; /* OpenType >= 1.2 */
else
table_size = 10; /* OpenType < 1.2 */
OTV_OPTIONAL_OFFSET( GlyphClassDef );
OTV_SIZE_CHECK( GlyphClassDef );
if ( GlyphClassDef )
otv_ClassDef_validate( table + GlyphClassDef, valid );
OTV_OPTIONAL_OFFSET( AttachListOffset );
OTV_SIZE_CHECK( AttachListOffset );
if ( AttachListOffset )
{
OTV_NEST2( AttachList, AttachPoint );
OTV_RUN( table + AttachListOffset, valid );
}
OTV_OPTIONAL_OFFSET( LigCaretListOffset );
OTV_SIZE_CHECK( LigCaretListOffset );
if ( LigCaretListOffset )
{
OTV_NEST3( LigCaretList, LigGlyph, CaretValue );
OTV_RUN( table + LigCaretListOffset, valid );
}
if ( need_MarkAttachClassDef )
{
OTV_OPTIONAL_OFFSET( MarkAttachClassDef );
OTV_SIZE_CHECK( MarkAttachClassDef );
if ( MarkAttachClassDef )
otv_ClassDef_validate( table + MarkAttachClassDef, valid );
}
FT_TRACE4(( "\n" ));
}
otv_GDEF_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 table_size;
FT_UShort version;
FT_Bool need_MarkAttachClassDef = 1;
OTV_OPTIONAL_TABLE( GlyphClassDef );
OTV_OPTIONAL_TABLE( AttachListOffset );
OTV_OPTIONAL_TABLE( LigCaretListOffset );
OTV_OPTIONAL_TABLE( MarkAttachClassDef );
OTV_OPTIONAL_TABLE( MarkGlyphSetsDef );
OTV_OPTIONAL_TABLE32( itemVarStore );
otvalid->root = ftvalid;
FT_TRACE3(( "validating GDEF table\n" ));
OTV_INIT;
OTV_LIMIT_CHECK( 4 );
if ( FT_NEXT_USHORT( p ) != 1 ) /* majorVersion */
FT_INVALID_FORMAT;
version = FT_NEXT_USHORT( p ); /* minorVersion */
table_size = 10;
switch ( version )
{
case 0:
/* MarkAttachClassDef has been added to the OpenType */
/* specification without increasing GDEF's version, */
/* so we use this ugly hack to find out whether the */
/* table is needed actually. */
need_MarkAttachClassDef = FT_BOOL(
otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) ||
otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) );
if ( need_MarkAttachClassDef )
{
OTV_LIMIT_CHECK( 8 );
table_size += 2;
}
else
OTV_LIMIT_CHECK( 6 ); /* OpenType < 1.2 */
break;
case 2:
OTV_LIMIT_CHECK( 10 );
table_size += 4;
break;
case 3:
OTV_LIMIT_CHECK( 14 );
table_size += 8;
break;
default:
FT_INVALID_FORMAT;
}
otvalid->glyph_count = glyph_count;
OTV_OPTIONAL_OFFSET( GlyphClassDef );
OTV_SIZE_CHECK( GlyphClassDef );
if ( GlyphClassDef )
otv_ClassDef_validate( table + GlyphClassDef, otvalid );
OTV_OPTIONAL_OFFSET( AttachListOffset );
OTV_SIZE_CHECK( AttachListOffset );
if ( AttachListOffset )
{
OTV_NEST2( AttachList, AttachPoint );
OTV_RUN( table + AttachListOffset, otvalid );
}
OTV_OPTIONAL_OFFSET( LigCaretListOffset );
OTV_SIZE_CHECK( LigCaretListOffset );
if ( LigCaretListOffset )
{
OTV_NEST3( LigCaretList, LigGlyph, CaretValue );
OTV_RUN( table + LigCaretListOffset, otvalid );
}
if ( need_MarkAttachClassDef )
{
OTV_OPTIONAL_OFFSET( MarkAttachClassDef );
OTV_SIZE_CHECK( MarkAttachClassDef );
if ( MarkAttachClassDef )
otv_ClassDef_validate( table + MarkAttachClassDef, otvalid );
}
if ( version > 0 )
{
OTV_OPTIONAL_OFFSET( MarkGlyphSetsDef );
OTV_SIZE_CHECK( MarkGlyphSetsDef );
if ( MarkGlyphSetsDef )
otv_MarkGlyphSets_validate( table + MarkGlyphSetsDef, otvalid );
}
if ( version > 2 )
{
OTV_OPTIONAL_OFFSET32( itemVarStore );
OTV_SIZE_CHECK32( itemVarStore );
if ( itemVarStore )
OTV_TRACE(( " [omitting itemVarStore validation]\n" )); /* XXX */
}
FT_TRACE4(( "\n" ));
}