| /**************************************************************************** |
| * |
| * gxvkern.c |
| * |
| * TrueTypeGX/AAT kern table validation (body). |
| * |
| * Copyright (C) 2004-2022 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 "gxvalid.h" |
| #include "gxvcommn.h" |
| |
| #include <freetype/ftsnames.h> |
| #include <freetype/internal/services/svgxval.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 gxvkern |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** Data and Types *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef enum GXV_kern_Version_ |
| { |
| KERN_VERSION_CLASSIC = 0x0000, |
| KERN_VERSION_NEW = 0x0001 |
| |
| } GXV_kern_Version; |
| |
| |
| typedef enum GXV_kern_Dialect_ |
| { |
| KERN_DIALECT_UNKNOWN = 0, |
| KERN_DIALECT_MS = FT_VALIDATE_MS, |
| KERN_DIALECT_APPLE = FT_VALIDATE_APPLE, |
| KERN_DIALECT_ANY = FT_VALIDATE_CKERN |
| |
| } GXV_kern_Dialect; |
| |
| |
| typedef struct GXV_kern_DataRec_ |
| { |
| GXV_kern_Version version; |
| void *subtable_data; |
| GXV_kern_Dialect dialect_request; |
| |
| } GXV_kern_DataRec, *GXV_kern_Data; |
| |
| |
| #define GXV_KERN_DATA( field ) GXV_TABLE_DATA( kern, field ) |
| |
| #define KERN_IS_CLASSIC( gxvalid ) \ |
| ( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) ) |
| #define KERN_IS_NEW( gxvalid ) \ |
| ( KERN_VERSION_NEW == GXV_KERN_DATA( version ) ) |
| |
| #define KERN_DIALECT( gxvalid ) \ |
| GXV_KERN_DATA( dialect_request ) |
| #define KERN_ALLOWS_MS( gxvalid ) \ |
| ( KERN_DIALECT( gxvalid ) & KERN_DIALECT_MS ) |
| #define KERN_ALLOWS_APPLE( gxvalid ) \ |
| ( KERN_DIALECT( gxvalid ) & KERN_DIALECT_APPLE ) |
| |
| #define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( gxvalid ) ? 8 : 4 ) |
| #define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( gxvalid ) ? 8 : 6 ) |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** SUBTABLE VALIDATORS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| /* ============================= format 0 ============================== */ |
| |
| static void |
| gxv_kern_subtable_fmt0_pairs_validate( FT_Bytes table, |
| FT_Bytes limit, |
| FT_UShort nPairs, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UShort i; |
| |
| FT_UShort last_gid_left = 0; |
| FT_UShort last_gid_right = 0; |
| |
| FT_UNUSED( limit ); |
| |
| |
| GXV_NAME_ENTER( "kern format 0 pairs" ); |
| |
| for ( i = 0; i < nPairs; i++ ) |
| { |
| FT_UShort gid_left; |
| FT_UShort gid_right; |
| #ifdef GXV_LOAD_UNUSED_VARS |
| FT_Short kernValue; |
| #endif |
| |
| |
| /* left */ |
| gid_left = FT_NEXT_USHORT( p ); |
| gxv_glyphid_validate( gid_left, gxvalid ); |
| |
| /* right */ |
| gid_right = FT_NEXT_USHORT( p ); |
| gxv_glyphid_validate( gid_right, gxvalid ); |
| |
| /* Pairs of left and right GIDs must be unique and sorted. */ |
| GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right )); |
| if ( gid_left == last_gid_left ) |
| { |
| if ( last_gid_right < gid_right ) |
| last_gid_right = gid_right; |
| else |
| FT_INVALID_DATA; |
| } |
| else if ( last_gid_left < gid_left ) |
| { |
| last_gid_left = gid_left; |
| last_gid_right = gid_right; |
| } |
| else |
| FT_INVALID_DATA; |
| |
| /* skip the kern value */ |
| #ifdef GXV_LOAD_UNUSED_VARS |
| kernValue = FT_NEXT_SHORT( p ); |
| #else |
| p += 2; |
| #endif |
| } |
| |
| GXV_EXIT; |
| } |
| |
| static void |
| gxv_kern_subtable_fmt0_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
| |
| FT_UShort nPairs; |
| FT_UShort unitSize; |
| |
| |
| GXV_NAME_ENTER( "kern subtable format 0" ); |
| |
| unitSize = 2 + 2 + 2; |
| nPairs = 0; |
| |
| /* nPairs, searchRange, entrySelector, rangeShift */ |
| GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); |
| gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, gxvalid ); |
| p += 2 + 2 + 2 + 2; |
| |
| gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* ============================= format 1 ============================== */ |
| |
| |
| typedef struct GXV_kern_fmt1_StateOptRec_ |
| { |
| FT_UShort valueTable; |
| FT_UShort valueTable_length; |
| |
| } GXV_kern_fmt1_StateOptRec, *GXV_kern_fmt1_StateOptRecData; |
| |
| |
| static void |
| gxv_kern_subtable_fmt1_valueTable_load( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| GXV_kern_fmt1_StateOptRecData optdata = |
| (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; |
| |
| |
| GXV_LIMIT_CHECK( 2 ); |
| optdata->valueTable = FT_NEXT_USHORT( p ); |
| } |
| |
| |
| /* |
| * passed tables_size covers whole StateTable, including kern fmt1 header |
| */ |
| static void |
| gxv_kern_subtable_fmt1_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_kern_fmt1_StateOptRecData optdata = |
| (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; |
| |
| |
| o[0] = classTable; |
| o[1] = stateArray; |
| o[2] = entryTable; |
| o[3] = optdata->valueTable; |
| l[0] = classTable_length_p; |
| l[1] = stateArray_length_p; |
| l[2] = entryTable_length_p; |
| l[3] = &(optdata->valueTable_length); |
| |
| gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, gxvalid ); |
| } |
| |
| |
| /* |
| * passed table & limit are of whole StateTable, not including subtables |
| */ |
| static void |
| gxv_kern_subtable_fmt1_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 push; |
| FT_UShort dontAdvance; |
| #endif |
| FT_UShort valueOffset; |
| #ifdef GXV_LOAD_UNUSED_VARS |
| FT_UShort kernAction; |
| FT_UShort kernValue; |
| #endif |
| |
| FT_UNUSED( state ); |
| FT_UNUSED( glyphOffset_p ); |
| |
| |
| #ifdef GXV_LOAD_UNUSED_VARS |
| push = (FT_UShort)( ( flags >> 15 ) & 1 ); |
| dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
| #endif |
| valueOffset = (FT_UShort)( flags & 0x3FFF ); |
| |
| { |
| GXV_kern_fmt1_StateOptRecData vt_rec = |
| (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata; |
| FT_Bytes p; |
| |
| |
| if ( valueOffset < vt_rec->valueTable ) |
| FT_INVALID_OFFSET; |
| |
| p = table + valueOffset; |
| limit = table + vt_rec->valueTable + vt_rec->valueTable_length; |
| |
| GXV_LIMIT_CHECK( 2 + 2 ); |
| #ifdef GXV_LOAD_UNUSED_VARS |
| kernAction = FT_NEXT_USHORT( p ); |
| kernValue = FT_NEXT_USHORT( p ); |
| #endif |
| } |
| } |
| |
| |
| static void |
| gxv_kern_subtable_fmt1_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| GXV_kern_fmt1_StateOptRec vt_rec; |
| |
| |
| GXV_NAME_ENTER( "kern subtable format 1" ); |
| |
| gxvalid->statetable.optdata = |
| &vt_rec; |
| gxvalid->statetable.optdata_load_func = |
| gxv_kern_subtable_fmt1_valueTable_load; |
| gxvalid->statetable.subtable_setup_func = |
| gxv_kern_subtable_fmt1_subtable_setup; |
| gxvalid->statetable.entry_glyphoffset_fmt = |
| GXV_GLYPHOFFSET_NONE; |
| gxvalid->statetable.entry_validate_func = |
| gxv_kern_subtable_fmt1_entry_validate; |
| |
| gxv_StateTable_validate( p, limit, gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* ================ Data for Class-Based Subtables 2, 3 ================ */ |
| |
| typedef enum GXV_kern_ClassSpec_ |
| { |
| GXV_KERN_CLS_L = 0, |
| GXV_KERN_CLS_R |
| |
| } GXV_kern_ClassSpec; |
| |
| |
| /* ============================= format 2 ============================== */ |
| |
| /* ---------------------- format 2 specific data ----------------------- */ |
| |
| typedef struct GXV_kern_subtable_fmt2_DataRec_ |
| { |
| FT_UShort rowWidth; |
| FT_UShort array; |
| FT_UShort offset_min[2]; |
| FT_UShort offset_max[2]; |
| const FT_String* class_tag[2]; |
| GXV_odtect_Range odtect; |
| |
| } GXV_kern_subtable_fmt2_DataRec, *GXV_kern_subtable_fmt2_Data; |
| |
| |
| #define GXV_KERN_FMT2_DATA( field ) \ |
| ( ( (GXV_kern_subtable_fmt2_DataRec *) \ |
| ( GXV_KERN_DATA( subtable_data ) ) )->field ) |
| |
| |
| /* -------------------------- utility functions ----------------------- */ |
| |
| static void |
| gxv_kern_subtable_fmt2_clstbl_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_kern_ClassSpec spec, |
| GXV_Validator gxvalid ) |
| { |
| const FT_String* tag = GXV_KERN_FMT2_DATA( class_tag[spec] ); |
| GXV_odtect_Range odtect = GXV_KERN_FMT2_DATA( odtect ); |
| |
| FT_Bytes p = table; |
| FT_UShort firstGlyph; |
| FT_UShort nGlyphs; |
| |
| |
| GXV_NAME_ENTER( "kern format 2 classTable" ); |
| |
| GXV_LIMIT_CHECK( 2 + 2 ); |
| firstGlyph = FT_NEXT_USHORT( p ); |
| nGlyphs = FT_NEXT_USHORT( p ); |
| GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n", |
| tag, firstGlyph, nGlyphs )); |
| |
| gxv_glyphid_validate( firstGlyph, gxvalid ); |
| gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), gxvalid ); |
| |
| gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ), |
| &( GXV_KERN_FMT2_DATA( offset_min[spec] ) ), |
| &( GXV_KERN_FMT2_DATA( offset_max[spec] ) ), |
| gxvalid ); |
| |
| gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_kern_subtable_fmt2_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| GXV_ODTECT( 3, odtect ); |
| GXV_kern_subtable_fmt2_DataRec fmt2_rec = |
| { 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL }; |
| |
| FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
| FT_UShort leftOffsetTable; |
| FT_UShort rightOffsetTable; |
| |
| |
| GXV_NAME_ENTER( "kern subtable format 2" ); |
| |
| GXV_ODTECT_INIT( odtect ); |
| fmt2_rec.odtect = odtect; |
| GXV_KERN_DATA( subtable_data ) = &fmt2_rec; |
| |
| GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); |
| GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p ); |
| leftOffsetTable = FT_NEXT_USHORT( p ); |
| rightOffsetTable = FT_NEXT_USHORT( p ); |
| GXV_KERN_FMT2_DATA( array ) = FT_NEXT_USHORT( p ); |
| |
| GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) )); |
| |
| |
| GXV_LIMIT_CHECK( leftOffsetTable ); |
| GXV_LIMIT_CHECK( rightOffsetTable ); |
| GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) ); |
| |
| gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit, |
| GXV_KERN_CLS_L, gxvalid ); |
| |
| gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit, |
| GXV_KERN_CLS_R, gxvalid ); |
| |
| if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) + |
| GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] ) |
| < GXV_KERN_FMT2_DATA( array ) ) |
| FT_INVALID_OFFSET; |
| |
| gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ), |
| GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] ) |
| + GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] ) |
| - GXV_KERN_FMT2_DATA( array ), |
| "array", odtect ); |
| |
| gxv_odtect_validate( odtect, gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* ============================= format 3 ============================== */ |
| |
| static void |
| gxv_kern_subtable_fmt3_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
| FT_UShort glyphCount; |
| FT_Byte kernValueCount; |
| FT_Byte leftClassCount; |
| FT_Byte rightClassCount; |
| FT_Byte flags; |
| |
| |
| GXV_NAME_ENTER( "kern subtable format 3" ); |
| |
| GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 ); |
| glyphCount = FT_NEXT_USHORT( p ); |
| kernValueCount = FT_NEXT_BYTE( p ); |
| leftClassCount = FT_NEXT_BYTE( p ); |
| rightClassCount = FT_NEXT_BYTE( p ); |
| flags = FT_NEXT_BYTE( p ); |
| |
| if ( gxvalid->face->num_glyphs != glyphCount ) |
| { |
| GXV_TRACE(( "maxGID=%ld, but glyphCount=%d\n", |
| gxvalid->face->num_glyphs, glyphCount )); |
| GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); |
| } |
| |
| if ( flags != 0 ) |
| GXV_TRACE(( "kern subtable fmt3 has nonzero value" |
| " (%d) in unused flag\n", flags )); |
| /* |
| * just skip kernValue[kernValueCount] |
| */ |
| GXV_LIMIT_CHECK( 2 * kernValueCount ); |
| p += 2 * kernValueCount; |
| |
| /* |
| * check leftClass[gid] < leftClassCount |
| */ |
| { |
| FT_Byte min, max; |
| |
| |
| GXV_LIMIT_CHECK( glyphCount ); |
| gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid ); |
| p += gxvalid->subtable_length; |
| |
| if ( leftClassCount < max ) |
| FT_INVALID_DATA; |
| } |
| |
| /* |
| * check rightClass[gid] < rightClassCount |
| */ |
| { |
| FT_Byte min, max; |
| |
| |
| GXV_LIMIT_CHECK( glyphCount ); |
| gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid ); |
| p += gxvalid->subtable_length; |
| |
| if ( rightClassCount < max ) |
| FT_INVALID_DATA; |
| } |
| |
| /* |
| * check kernIndex[i, j] < kernValueCount |
| */ |
| { |
| FT_UShort i, j; |
| |
| |
| for ( i = 0; i < leftClassCount; i++ ) |
| { |
| for ( j = 0; j < rightClassCount; j++ ) |
| { |
| GXV_LIMIT_CHECK( 1 ); |
| if ( kernValueCount < FT_NEXT_BYTE( p ) ) |
| FT_INVALID_OFFSET; |
| } |
| } |
| } |
| |
| gxvalid->subtable_length = (FT_ULong)( p - table ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| static FT_Bool |
| gxv_kern_coverage_new_apple_validate( FT_UShort coverage, |
| FT_UShort* format, |
| GXV_Validator gxvalid ) |
| { |
| /* new Apple-dialect */ |
| #ifdef GXV_LOAD_TRACE_VARS |
| FT_Bool kernVertical; |
| FT_Bool kernCrossStream; |
| FT_Bool kernVariation; |
| #endif |
| |
| FT_UNUSED( gxvalid ); |
| |
| |
| /* reserved bits = 0 */ |
| if ( coverage & 0x1FFC ) |
| return FALSE; |
| |
| #ifdef GXV_LOAD_TRACE_VARS |
| kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 ); |
| kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 ); |
| kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 ); |
| #endif |
| |
| *format = (FT_UShort)( coverage & 0x0003 ); |
| |
| GXV_TRACE(( "new Apple-dialect: " |
| "horizontal=%d, cross-stream=%d, variation=%d, format=%d\n", |
| !kernVertical, kernCrossStream, kernVariation, *format )); |
| |
| GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); |
| |
| return TRUE; |
| } |
| |
| |
| static FT_Bool |
| gxv_kern_coverage_classic_apple_validate( FT_UShort coverage, |
| FT_UShort* format, |
| GXV_Validator gxvalid ) |
| { |
| /* classic Apple-dialect */ |
| #ifdef GXV_LOAD_TRACE_VARS |
| FT_Bool horizontal; |
| FT_Bool cross_stream; |
| #endif |
| |
| |
| /* check expected flags, but don't check if MS-dialect is impossible */ |
| if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( gxvalid ) ) |
| return FALSE; |
| |
| /* reserved bits = 0 */ |
| if ( coverage & 0x02FC ) |
| return FALSE; |
| |
| #ifdef GXV_LOAD_TRACE_VARS |
| horizontal = FT_BOOL( ( coverage >> 15 ) & 1 ); |
| cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 ); |
| #endif |
| |
| *format = (FT_UShort)( coverage & 0x0003 ); |
| |
| GXV_TRACE(( "classic Apple-dialect: " |
| "horizontal=%d, cross-stream=%d, format=%d\n", |
| horizontal, cross_stream, *format )); |
| |
| /* format 1 requires GX State Machine, too new for classic */ |
| if ( *format == 1 ) |
| return FALSE; |
| |
| GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); |
| |
| return TRUE; |
| } |
| |
| |
| static FT_Bool |
| gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage, |
| FT_UShort* format, |
| GXV_Validator gxvalid ) |
| { |
| /* classic Microsoft-dialect */ |
| #ifdef GXV_LOAD_TRACE_VARS |
| FT_Bool horizontal; |
| FT_Bool minimum; |
| FT_Bool cross_stream; |
| FT_Bool override; |
| #endif |
| |
| FT_UNUSED( gxvalid ); |
| |
| |
| /* reserved bits = 0 */ |
| if ( coverage & 0xFDF0 ) |
| return FALSE; |
| |
| #ifdef GXV_LOAD_TRACE_VARS |
| horizontal = FT_BOOL( coverage & 1 ); |
| minimum = FT_BOOL( ( coverage >> 1 ) & 1 ); |
| cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 ); |
| override = FT_BOOL( ( coverage >> 3 ) & 1 ); |
| #endif |
| |
| *format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 ); |
| |
| GXV_TRACE(( "classic Microsoft-dialect: " |
| "horizontal=%d, minimum=%d, cross-stream=%d, " |
| "override=%d, format=%d\n", |
| horizontal, minimum, cross_stream, override, *format )); |
| |
| if ( *format == 2 ) |
| GXV_TRACE(( |
| "kerning values in Microsoft format 2 subtable are ignored\n" )); |
| |
| return TRUE; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** MAIN *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static GXV_kern_Dialect |
| gxv_kern_coverage_validate( FT_UShort coverage, |
| FT_UShort* format, |
| GXV_Validator gxvalid ) |
| { |
| GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN; |
| |
| |
| GXV_NAME_ENTER( "validating coverage" ); |
| |
| GXV_TRACE(( "interpret coverage 0x%04x by Apple style\n", coverage )); |
| |
| if ( KERN_IS_NEW( gxvalid ) ) |
| { |
| if ( gxv_kern_coverage_new_apple_validate( coverage, |
| format, |
| gxvalid ) ) |
| { |
| result = KERN_DIALECT_APPLE; |
| goto Exit; |
| } |
| } |
| |
| if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_APPLE( gxvalid ) ) |
| { |
| if ( gxv_kern_coverage_classic_apple_validate( coverage, |
| format, |
| gxvalid ) ) |
| { |
| result = KERN_DIALECT_APPLE; |
| goto Exit; |
| } |
| } |
| |
| if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_MS( gxvalid ) ) |
| { |
| if ( gxv_kern_coverage_classic_microsoft_validate( coverage, |
| format, |
| gxvalid ) ) |
| { |
| result = KERN_DIALECT_MS; |
| goto Exit; |
| } |
| } |
| |
| GXV_TRACE(( "cannot interpret coverage, broken kern subtable\n" )); |
| |
| Exit: |
| GXV_EXIT; |
| return result; |
| } |
| |
| |
| static void |
| gxv_kern_subtable_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| #ifdef GXV_LOAD_TRACE_VARS |
| FT_UShort version = 0; /* MS only: subtable version, unused */ |
| #endif |
| FT_ULong length; /* MS: 16bit, Apple: 32bit */ |
| FT_UShort coverage; |
| #ifdef GXV_LOAD_TRACE_VARS |
| FT_UShort tupleIndex = 0; /* Apple only */ |
| #endif |
| FT_UShort u16[2]; |
| FT_UShort format = 255; /* subtable format */ |
| |
| |
| GXV_NAME_ENTER( "kern subtable" ); |
| |
| GXV_LIMIT_CHECK( 2 + 2 + 2 ); |
| u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */ |
| u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */ |
| coverage = FT_NEXT_USHORT( p ); |
| |
| switch ( gxv_kern_coverage_validate( coverage, &format, gxvalid ) ) |
| { |
| case KERN_DIALECT_MS: |
| #ifdef GXV_LOAD_TRACE_VARS |
| version = u16[0]; |
| #endif |
| length = u16[1]; |
| #ifdef GXV_LOAD_TRACE_VARS |
| tupleIndex = 0; |
| #endif |
| GXV_TRACE(( "Subtable version = %d\n", version )); |
| GXV_TRACE(( "Subtable length = %lu\n", length )); |
| break; |
| |
| case KERN_DIALECT_APPLE: |
| #ifdef GXV_LOAD_TRACE_VARS |
| version = 0; |
| #endif |
| length = ( (FT_ULong)u16[0] << 16 ) + u16[1]; |
| #ifdef GXV_LOAD_TRACE_VARS |
| tupleIndex = 0; |
| #endif |
| GXV_TRACE(( "Subtable length = %lu\n", length )); |
| |
| if ( KERN_IS_NEW( gxvalid ) ) |
| { |
| GXV_LIMIT_CHECK( 2 ); |
| #ifdef GXV_LOAD_TRACE_VARS |
| tupleIndex = FT_NEXT_USHORT( p ); |
| #else |
| p += 2; |
| #endif |
| GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex )); |
| } |
| break; |
| |
| default: |
| length = u16[1]; |
| GXV_TRACE(( "cannot detect subtable dialect, " |
| "just skip %lu byte\n", length )); |
| goto Exit; |
| } |
| |
| /* formats 1, 2, 3 require the position of the start of this subtable */ |
| if ( format == 0 ) |
| gxv_kern_subtable_fmt0_validate( table, table + length, gxvalid ); |
| else if ( format == 1 ) |
| gxv_kern_subtable_fmt1_validate( table, table + length, gxvalid ); |
| else if ( format == 2 ) |
| gxv_kern_subtable_fmt2_validate( table, table + length, gxvalid ); |
| else if ( format == 3 ) |
| gxv_kern_subtable_fmt3_validate( table, table + length, gxvalid ); |
| else |
| FT_INVALID_DATA; |
| |
| Exit: |
| gxvalid->subtable_length = length; |
| GXV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** kern TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| gxv_kern_validate_generic( FT_Bytes table, |
| FT_Face face, |
| FT_Bool classic_only, |
| GXV_kern_Dialect dialect_request, |
| FT_Validator ftvalid ) |
| { |
| GXV_ValidatorRec gxvalidrec; |
| GXV_Validator gxvalid = &gxvalidrec; |
| |
| GXV_kern_DataRec kernrec; |
| GXV_kern_Data kern = &kernrec; |
| |
| FT_Bytes p = table; |
| FT_Bytes limit = 0; |
| |
| FT_ULong nTables = 0; |
| FT_UInt i; |
| |
| |
| gxvalid->root = ftvalid; |
| gxvalid->table_data = kern; |
| gxvalid->face = face; |
| |
| FT_TRACE3(( "validating `kern' table\n" )); |
| GXV_INIT; |
| KERN_DIALECT( gxvalid ) = dialect_request; |
| |
| GXV_LIMIT_CHECK( 2 ); |
| GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p ); |
| GXV_TRACE(( "version 0x%04x (higher 16bit)\n", |
| GXV_KERN_DATA( version ) )); |
| |
| if ( 0x0001 < GXV_KERN_DATA( version ) ) |
| FT_INVALID_FORMAT; |
| else if ( KERN_IS_CLASSIC( gxvalid ) ) |
| { |
| GXV_LIMIT_CHECK( 2 ); |
| nTables = FT_NEXT_USHORT( p ); |
| } |
| else if ( KERN_IS_NEW( gxvalid ) ) |
| { |
| if ( classic_only ) |
| FT_INVALID_FORMAT; |
| |
| if ( 0x0000 != FT_NEXT_USHORT( p ) ) |
| FT_INVALID_FORMAT; |
| |
| GXV_LIMIT_CHECK( 4 ); |
| nTables = FT_NEXT_ULONG( p ); |
| } |
| |
| for ( i = 0; i < nTables; i++ ) |
| { |
| GXV_TRACE(( "validating subtable %d/%lu\n", i, nTables )); |
| /* p should be 32bit-aligned? */ |
| gxv_kern_subtable_validate( p, 0, gxvalid ); |
| p += gxvalid->subtable_length; |
| } |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| gxv_kern_validate( FT_Bytes table, |
| FT_Face face, |
| FT_Validator ftvalid ) |
| { |
| gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid ); |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| gxv_kern_validate_classic( FT_Bytes table, |
| FT_Face face, |
| FT_Int dialect_flags, |
| FT_Validator ftvalid ) |
| { |
| GXV_kern_Dialect dialect_request; |
| |
| |
| dialect_request = (GXV_kern_Dialect)dialect_flags; |
| gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid ); |
| } |
| |
| |
| /* END */ |
