| /**************************************************************************** |
| * |
| * gxvmort1.c |
| * |
| * TrueTypeGX/AAT mort table validation |
| * body for type1 (Contextual Substitution) subtable. |
| * |
| * Copyright (C) 2005-2022 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 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 gxvalid ) |
| { |
| FT_Bytes p = table; |
| |
| GXV_mort_subtable_type1_StateOptRecData optdata = |
| (GXV_mort_subtable_type1_StateOptRecData)gxvalid->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 gxvalid ) |
| { |
| FT_UShort o[4]; |
| FT_UShort *l[4]; |
| FT_UShort buff[5]; |
| |
| GXV_mort_subtable_type1_StateOptRecData optdata = |
| (GXV_mort_subtable_type1_StateOptRecData)gxvalid->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, gxvalid ); |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type1_offset_to_subst_validate( |
| FT_Short wordOffset, |
| const FT_String* tag, |
| FT_Byte state, |
| GXV_Validator gxvalid ) |
| { |
| FT_UShort substTable; |
| FT_UShort substTable_limit; |
| |
| FT_UNUSED( tag ); |
| FT_UNUSED( state ); |
| |
| |
| substTable = |
| ((GXV_mort_subtable_type1_StateOptRec *) |
| (gxvalid->statetable.optdata))->substitutionTable; |
| substTable_limit = |
| (FT_UShort)( substTable + |
| ((GXV_mort_subtable_type1_StateOptRec *) |
| (gxvalid->statetable.optdata))->substitutionTable_length ); |
| |
| gxvalid->min_gid = (FT_UShort)( ( substTable - wordOffset * 2 ) / 2 ); |
| gxvalid->max_gid = (FT_UShort)( ( substTable_limit - wordOffset * 2 ) / 2 ); |
| gxvalid->max_gid = (FT_UShort)( FT_MAX( gxvalid->max_gid, |
| gxvalid->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_GlyphOffsetCPtr glyphOffset_p, |
| FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| #ifdef GXV_LOAD_UNUSED_VARS |
| FT_UShort setMark; |
| FT_UShort dontAdvance; |
| #endif |
| FT_UShort reserved; |
| FT_Short markOffset; |
| FT_Short currentOffset; |
| |
| FT_UNUSED( table ); |
| FT_UNUSED( limit ); |
| |
| |
| #ifdef GXV_LOAD_UNUSED_VARS |
| setMark = (FT_UShort)( flags >> 15 ); |
| dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
| #endif |
| reserved = (FT_UShort)( flags & 0x3FFF ); |
| |
| markOffset = (FT_Short)( glyphOffset_p->ul >> 16 ); |
| currentOffset = (FT_Short)( glyphOffset_p->ul ); |
| |
| if ( 0 < reserved ) |
| { |
| GXV_TRACE(( " non-zero bits found in reserved range\n" )); |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); |
| } |
| |
| gxv_mort_subtable_type1_offset_to_subst_validate( markOffset, |
| "markOffset", |
| state, |
| gxvalid ); |
| |
| gxv_mort_subtable_type1_offset_to_subst_validate( currentOffset, |
| "currentOffset", |
| state, |
| gxvalid ); |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type1_substTable_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UShort num_gids = (FT_UShort)( |
| ((GXV_mort_subtable_type1_StateOptRec *) |
| (gxvalid->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 < gxvalid->min_gid || gxvalid->max_gid < dst_gid ) |
| { |
| GXV_TRACE(( "substTable include a strange gid[%d]=%d >" |
| " out of define range (%d..%d)\n", |
| i, dst_gid, gxvalid->min_gid, gxvalid->max_gid )); |
| GXV_SET_ERR_IF_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 gxvalid ) |
| { |
| 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 ); |
| |
| gxvalid->statetable.optdata = |
| &st_rec; |
| gxvalid->statetable.optdata_load_func = |
| gxv_mort_subtable_type1_substitutionTable_load; |
| gxvalid->statetable.subtable_setup_func = |
| gxv_mort_subtable_type1_subtable_setup; |
| gxvalid->statetable.entry_glyphoffset_fmt = |
| GXV_GLYPHOFFSET_ULONG; |
| gxvalid->statetable.entry_validate_func = |
| |
| gxv_mort_subtable_type1_entry_validate; |
| gxv_StateTable_validate( p, limit, gxvalid ); |
| |
| gxv_mort_subtable_type1_substTable_validate( |
| table + st_rec.substitutionTable, |
| table + st_rec.substitutionTable + st_rec.substitutionTable_length, |
| gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* END */ |
