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-rw-r--r--src/gxvalid/gxvmort1.c258
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diff --git a/src/gxvalid/gxvmort1.c b/src/gxvalid/gxvmort1.c
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+/***************************************************************************/
+/* */
+/* gxvmort1.c */
+/* */
+/* TrueTypeGX/AAT mort table validation */
+/* body for type1 (Contextual Substitution) subtable. */
+/* */
+/* Copyright 2005, 2007 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+/***************************************************************************/
+/* */
+/* gxvalid is derived from both gxlayout module and otvalid module. */
+/* Development of gxlayout is supported by the Information-technology */
+/* Promotion Agency(IPA), Japan. */
+/* */
+/***************************************************************************/
+
+
+#include "gxvmort.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_gxvmort
+
+
+ typedef struct GXV_mort_subtable_type1_StateOptRec_
+ {
+ FT_UShort substitutionTable;
+ FT_UShort substitutionTable_length;
+
+ } GXV_mort_subtable_type1_StateOptRec,
+ *GXV_mort_subtable_type1_StateOptRecData;
+
+#define GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE \
+ ( GXV_STATETABLE_HEADER_SIZE + 2 )
+
+
+ static void
+ gxv_mort_subtable_type1_substitutionTable_load( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ GXV_mort_subtable_type1_StateOptRecData optdata =
+ (GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata;
+
+
+ GXV_LIMIT_CHECK( 2 );
+ optdata->substitutionTable = FT_NEXT_USHORT( p );
+ }
+
+
+ static void
+ gxv_mort_subtable_type1_subtable_setup( FT_UShort table_size,
+ FT_UShort classTable,
+ FT_UShort stateArray,
+ FT_UShort entryTable,
+ FT_UShort* classTable_length_p,
+ FT_UShort* stateArray_length_p,
+ FT_UShort* entryTable_length_p,
+ GXV_Validator valid )
+ {
+ FT_UShort o[4];
+ FT_UShort *l[4];
+ FT_UShort buff[5];
+
+ GXV_mort_subtable_type1_StateOptRecData optdata =
+ (GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata;
+
+
+ o[0] = classTable;
+ o[1] = stateArray;
+ o[2] = entryTable;
+ o[3] = optdata->substitutionTable;
+ l[0] = classTable_length_p;
+ l[1] = stateArray_length_p;
+ l[2] = entryTable_length_p;
+ l[3] = &( optdata->substitutionTable_length );
+
+ gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid );
+ }
+
+
+ static void
+ gxv_mort_subtable_type1_offset_to_subst_validate(
+ FT_Short wordOffset,
+ const FT_String* tag,
+ FT_Byte state,
+ GXV_Validator valid )
+ {
+ FT_UShort substTable;
+ FT_UShort substTable_limit;
+ FT_UShort min_gid;
+ FT_UShort max_gid;
+
+ FT_UNUSED( tag );
+ FT_UNUSED( state );
+
+
+ substTable =
+ ((GXV_mort_subtable_type1_StateOptRec *)
+ (valid->statetable.optdata))->substitutionTable;
+ substTable_limit =
+ (FT_UShort)( substTable +
+ ((GXV_mort_subtable_type1_StateOptRec *)
+ (valid->statetable.optdata))->substitutionTable_length );
+
+ min_gid = (FT_UShort)( ( substTable - wordOffset * 2 ) / 2 );
+ max_gid = (FT_UShort)( ( substTable_limit - wordOffset * 2 ) / 2 );
+ max_gid = (FT_UShort)( FT_MAX( max_gid, valid->face->num_glyphs ) );
+
+ /* XXX: check range? */
+
+ /* TODO: min_gid & max_gid comparison with ClassTable contents */
+ }
+
+
+ static void
+ gxv_mort_subtable_type1_entry_validate(
+ FT_Byte state,
+ FT_UShort flags,
+ GXV_StateTable_GlyphOffsetDesc glyphOffset,
+ FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_UShort setMark;
+ FT_UShort dontAdvance;
+ FT_UShort reserved;
+ FT_Short markOffset;
+ FT_Short currentOffset;
+
+ FT_UNUSED( table );
+ FT_UNUSED( limit );
+
+
+ setMark = (FT_UShort)( flags >> 15 );
+ dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
+ reserved = (FT_Short)( flags & 0x3FFF );
+
+ markOffset = (FT_Short)( glyphOffset.ul >> 16 );
+ currentOffset = (FT_Short)( glyphOffset.ul );
+
+ if ( 0 < reserved )
+ {
+ GXV_TRACE(( " non-zero bits found in reserved range\n" ));
+ if ( valid->root->level >= FT_VALIDATE_PARANOID )
+ FT_INVALID_DATA;
+ }
+
+ gxv_mort_subtable_type1_offset_to_subst_validate( markOffset,
+ "markOffset",
+ state,
+ valid );
+
+ gxv_mort_subtable_type1_offset_to_subst_validate( currentOffset,
+ "currentOffset",
+ state,
+ valid );
+ }
+
+
+ static void
+ gxv_mort_subtable_type1_substTable_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+ FT_UShort num_gids = (FT_UShort)(
+ ((GXV_mort_subtable_type1_StateOptRec *)
+ (valid->statetable.optdata))->substitutionTable_length / 2 );
+ FT_UShort i;
+
+
+ GXV_NAME_ENTER( "validating contents of substitutionTable" );
+ for ( i = 0; i < num_gids ; i ++ )
+ {
+ FT_UShort dst_gid;
+
+
+ GXV_LIMIT_CHECK( 2 );
+ dst_gid = FT_NEXT_USHORT( p );
+
+ if ( dst_gid >= 0xFFFFU )
+ continue;
+
+ if ( dst_gid > valid->face->num_glyphs )
+ {
+ GXV_TRACE(( "substTable include toolarge gid[%d]=%d >"
+ " max defined gid #%d\n",
+ i, dst_gid, valid->face->num_glyphs ));
+ if ( valid->root->level >= FT_VALIDATE_PARANOID )
+ FT_INVALID_GLYPH_ID;
+ }
+ }
+
+ GXV_EXIT;
+ }
+
+
+ /*
+ * subtable for Contextual glyph substitution is a modified StateTable.
+ * In addition to classTable, stateArray, and entryTable, the field
+ * `substitutionTable' is added.
+ */
+ FT_LOCAL_DEF( void )
+ gxv_mort_subtable_type1_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ GXV_mort_subtable_type1_StateOptRec st_rec;
+
+
+ GXV_NAME_ENTER( "mort chain subtable type1 (Contextual Glyph Subst)" );
+
+ GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE );
+
+ valid->statetable.optdata =
+ &st_rec;
+ valid->statetable.optdata_load_func =
+ gxv_mort_subtable_type1_substitutionTable_load;
+ valid->statetable.subtable_setup_func =
+ gxv_mort_subtable_type1_subtable_setup;
+ valid->statetable.entry_glyphoffset_fmt =
+ GXV_GLYPHOFFSET_ULONG;
+ valid->statetable.entry_validate_func =
+
+ gxv_mort_subtable_type1_entry_validate;
+ gxv_StateTable_validate( p, limit, valid );
+
+ gxv_mort_subtable_type1_substTable_validate(
+ table + st_rec.substitutionTable,
+ table + st_rec.substitutionTable + st_rec.substitutionTable_length,
+ valid );
+
+ GXV_EXIT;
+ }
+
+
+/* END */
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