| /***************************************************************************/ |
| /* */ |
| /* gxvmort2.c */ |
| /* */ |
| /* TrueTypeGX/AAT mort table validation */ |
| /* body for type2 (Ligature Substitution) subtable. */ |
| /* */ |
| /* Copyright 2005-2015 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_type2_StateOptRec_ |
| { |
| FT_UShort ligActionTable; |
| FT_UShort componentTable; |
| FT_UShort ligatureTable; |
| FT_UShort ligActionTable_length; |
| FT_UShort componentTable_length; |
| FT_UShort ligatureTable_length; |
| |
| } GXV_mort_subtable_type2_StateOptRec, |
| *GXV_mort_subtable_type2_StateOptRecData; |
| |
| #define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \ |
| ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 ) |
| |
| |
| static void |
| gxv_mort_subtable_type2_opttable_load( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| GXV_mort_subtable_type2_StateOptRecData optdata = |
| (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; |
| |
| |
| GXV_LIMIT_CHECK( 2 + 2 + 2 ); |
| optdata->ligActionTable = FT_NEXT_USHORT( p ); |
| optdata->componentTable = FT_NEXT_USHORT( p ); |
| optdata->ligatureTable = FT_NEXT_USHORT( p ); |
| |
| GXV_TRACE(( "offset to ligActionTable=0x%04x\n", |
| optdata->ligActionTable )); |
| GXV_TRACE(( "offset to componentTable=0x%04x\n", |
| optdata->componentTable )); |
| GXV_TRACE(( "offset to ligatureTable=0x%04x\n", |
| optdata->ligatureTable )); |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type2_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[6]; |
| FT_UShort *l[6]; |
| FT_UShort buff[7]; |
| |
| GXV_mort_subtable_type2_StateOptRecData optdata = |
| (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; |
| |
| |
| GXV_NAME_ENTER( "subtable boundaries setup" ); |
| |
| o[0] = classTable; |
| o[1] = stateArray; |
| o[2] = entryTable; |
| o[3] = optdata->ligActionTable; |
| o[4] = optdata->componentTable; |
| o[5] = optdata->ligatureTable; |
| l[0] = classTable_length_p; |
| l[1] = stateArray_length_p; |
| l[2] = entryTable_length_p; |
| l[3] = &(optdata->ligActionTable_length); |
| l[4] = &(optdata->componentTable_length); |
| l[5] = &(optdata->ligatureTable_length); |
| |
| gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, gxvalid ); |
| |
| GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n", |
| classTable, *classTable_length_p )); |
| GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n", |
| stateArray, *stateArray_length_p )); |
| GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n", |
| entryTable, *entryTable_length_p )); |
| GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n", |
| optdata->ligActionTable, |
| optdata->ligActionTable_length )); |
| GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n", |
| optdata->componentTable, |
| optdata->componentTable_length )); |
| GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n", |
| optdata->ligatureTable, |
| optdata->ligatureTable_length )); |
| |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type2_ligActionOffset_validate( |
| FT_Bytes table, |
| FT_UShort ligActionOffset, |
| GXV_Validator gxvalid ) |
| { |
| /* access ligActionTable */ |
| GXV_mort_subtable_type2_StateOptRecData optdata = |
| (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; |
| |
| FT_Bytes lat_base = table + optdata->ligActionTable; |
| FT_Bytes p = table + ligActionOffset; |
| FT_Bytes lat_limit = lat_base + optdata->ligActionTable; |
| |
| |
| GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset ); |
| if ( p < lat_base ) |
| { |
| GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n", |
| ligActionOffset, lat_base - p )); |
| |
| /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); |
| } |
| else if ( lat_limit < p ) |
| { |
| GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n", |
| ligActionOffset, p - lat_limit )); |
| |
| /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); |
| } |
| else |
| { |
| /* validate entry in ligActionTable */ |
| FT_ULong lig_action; |
| #ifdef GXV_LOAD_UNUSED_VARS |
| FT_UShort last; |
| FT_UShort store; |
| #endif |
| FT_ULong offset; |
| |
| |
| lig_action = FT_NEXT_ULONG( p ); |
| #ifdef GXV_LOAD_UNUSED_VARS |
| last = (FT_UShort)( ( lig_action >> 31 ) & 1 ); |
| store = (FT_UShort)( ( lig_action >> 30 ) & 1 ); |
| #endif |
| |
| /* Apple spec defines this offset as a word offset */ |
| offset = lig_action & 0x3FFFFFFFUL; |
| if ( offset * 2 < optdata->ligatureTable ) |
| { |
| GXV_TRACE(( "too short offset 0x%08x:" |
| " 2 x offset < ligatureTable (%d byte rewind)\n", |
| offset, optdata->ligatureTable - offset * 2 )); |
| |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); |
| } else if ( offset * 2 > |
| optdata->ligatureTable + optdata->ligatureTable_length ) |
| { |
| GXV_TRACE(( "too long offset 0x%08x:" |
| " 2 x offset > ligatureTable + ligatureTable_length" |
| " (%d byte overrun)\n", |
| offset, |
| optdata->ligatureTable + optdata->ligatureTable_length |
| - offset * 2 )); |
| |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); |
| } |
| } |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type2_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 setComponent; |
| FT_UShort dontAdvance; |
| #endif |
| FT_UShort offset; |
| |
| FT_UNUSED( state ); |
| FT_UNUSED( glyphOffset_p ); |
| FT_UNUSED( limit ); |
| |
| |
| #ifdef GXV_LOAD_UNUSED_VARS |
| setComponent = (FT_UShort)( ( flags >> 15 ) & 1 ); |
| dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
| #endif |
| |
| offset = (FT_UShort)( flags & 0x3FFFU ); |
| |
| if ( 0 < offset ) |
| gxv_mort_subtable_type2_ligActionOffset_validate( table, offset, |
| gxvalid ); |
| } |
| |
| |
| static void |
| gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table, |
| GXV_Validator gxvalid ) |
| { |
| GXV_mort_subtable_type2_StateOptRecData optdata = |
| (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; |
| |
| FT_Bytes p = table + optdata->ligatureTable; |
| FT_Bytes limit = table + optdata->ligatureTable |
| + optdata->ligatureTable_length; |
| |
| |
| GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" ); |
| if ( 0 != optdata->ligatureTable ) |
| { |
| /* Apple does not give specification of ligatureTable format */ |
| while ( p < limit ) |
| { |
| FT_UShort lig_gid; |
| |
| |
| GXV_LIMIT_CHECK( 2 ); |
| lig_gid = FT_NEXT_USHORT( p ); |
| |
| if ( gxvalid->face->num_glyphs < lig_gid ) |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); |
| } |
| } |
| GXV_EXIT; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| gxv_mort_subtable_type2_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| |
| GXV_mort_subtable_type2_StateOptRec lig_rec; |
| |
| |
| GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" ); |
| |
| GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE ); |
| |
| gxvalid->statetable.optdata = |
| &lig_rec; |
| gxvalid->statetable.optdata_load_func = |
| gxv_mort_subtable_type2_opttable_load; |
| gxvalid->statetable.subtable_setup_func = |
| gxv_mort_subtable_type2_subtable_setup; |
| gxvalid->statetable.entry_glyphoffset_fmt = |
| GXV_GLYPHOFFSET_NONE; |
| gxvalid->statetable.entry_validate_func = |
| gxv_mort_subtable_type2_entry_validate; |
| |
| gxv_StateTable_validate( p, limit, gxvalid ); |
| |
| p += gxvalid->subtable_length; |
| gxv_mort_subtable_type2_ligatureTable_validate( table, gxvalid ); |
| |
| gxvalid->subtable_length = (FT_ULong)( p - table ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* END */ |
