diff options
Diffstat (limited to 'src/gxvalid/gxvkern.c')
| -rw-r--r-- | src/gxvalid/gxvkern.c | 876 |
1 files changed, 0 insertions, 876 deletions
diff --git a/src/gxvalid/gxvkern.c b/src/gxvalid/gxvkern.c deleted file mode 100644 index bfb405f..0000000 --- a/src/gxvalid/gxvkern.c +++ /dev/null @@ -1,876 +0,0 @@ -/***************************************************************************/ -/* */ -/* gxvkern.c */ -/* */ -/* TrueTypeGX/AAT kern table validation (body). */ -/* */ -/* Copyright 2004, 2005, 2006, 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 "gxvalid.h" -#include "gxvcommn.h" - -#include FT_SFNT_NAMES_H -#include FT_SERVICE_GX_VALIDATE_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_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( valid ) \ - ( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) ) -#define KERN_IS_NEW( valid ) \ - ( KERN_VERSION_NEW == GXV_KERN_DATA( version ) ) - -#define KERN_DIALECT( valid ) \ - GXV_KERN_DATA( dialect_request ) -#define KERN_ALLOWS_MS( valid ) \ - ( KERN_DIALECT( valid ) & KERN_DIALECT_MS ) -#define KERN_ALLOWS_APPLE( valid ) \ - ( KERN_DIALECT( valid ) & KERN_DIALECT_APPLE ) - -#define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 4 ) -#define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 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 valid ) - { - 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; - FT_Short kernValue; - - - /* left */ - gid_left = FT_NEXT_USHORT( p ); - gxv_glyphid_validate( gid_left, valid ); - - /* right */ - gid_right = FT_NEXT_USHORT( p ); - gxv_glyphid_validate( gid_right, valid ); - - /* 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 */ - kernValue = FT_NEXT_SHORT( p ); - } - - GXV_EXIT; - } - - static void - gxv_kern_subtable_fmt0_validate( FT_Bytes table, - FT_Bytes limit, - GXV_Validator valid ) - { - 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, valid ); - p += 2 + 2 + 2 + 2; - - gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, valid ); - - 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 valid ) - { - FT_Bytes p = table; - GXV_kern_fmt1_StateOptRecData optdata = - (GXV_kern_fmt1_StateOptRecData)valid->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 valid ) - { - FT_UShort o[4]; - FT_UShort *l[4]; - FT_UShort buff[5]; - - GXV_kern_fmt1_StateOptRecData optdata = - (GXV_kern_fmt1_StateOptRecData)valid->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, valid ); - } - - - /* - * 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_GlyphOffsetDesc glyphOffset, - FT_Bytes table, - FT_Bytes limit, - GXV_Validator valid ) - { - FT_UShort push; - FT_UShort dontAdvance; - FT_UShort valueOffset; - FT_UShort kernAction; - FT_UShort kernValue; - - FT_UNUSED( state ); - FT_UNUSED( glyphOffset ); - - - push = (FT_UShort)( ( flags >> 15 ) & 1 ); - dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); - valueOffset = (FT_UShort)( flags & 0x3FFF ); - - { - GXV_kern_fmt1_StateOptRecData vt_rec = - (GXV_kern_fmt1_StateOptRecData)valid->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 ); - kernAction = FT_NEXT_USHORT( p ); - kernValue = FT_NEXT_USHORT( p ); - } - } - - - static void - gxv_kern_subtable_fmt1_validate( FT_Bytes table, - FT_Bytes limit, - GXV_Validator valid ) - { - FT_Bytes p = table; - GXV_kern_fmt1_StateOptRec vt_rec; - - - GXV_NAME_ENTER( "kern subtable format 1" ); - - valid->statetable.optdata = - &vt_rec; - valid->statetable.optdata_load_func = - gxv_kern_subtable_fmt1_valueTable_load; - valid->statetable.subtable_setup_func = - gxv_kern_subtable_fmt1_subtable_setup; - valid->statetable.entry_glyphoffset_fmt = - GXV_GLYPHOFFSET_NONE; - valid->statetable.entry_validate_func = - gxv_kern_subtable_fmt1_entry_validate; - - gxv_StateTable_validate( p, limit, valid ); - - 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 valid ) - { - 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, valid ); - gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), valid ); - - gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ), - &( GXV_KERN_FMT2_DATA( offset_min[spec] ) ), - &( GXV_KERN_FMT2_DATA( offset_max[spec] ) ), - valid ); - - 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 valid ) - { - 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, valid ); - - gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit, - GXV_KERN_CLS_R, valid ); - - 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, valid ); - - GXV_EXIT; - } - - - /* ============================= format 3 ============================== */ - - static void - gxv_kern_subtable_fmt3_validate( FT_Bytes table, - FT_Bytes limit, - GXV_Validator valid ) - { - 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 ( valid->face->num_glyphs != glyphCount ) - { - GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n", - valid->face->num_glyphs, glyphCount )); - if ( valid->root->level >= FT_VALIDATE_PARANOID ) - FT_INVALID_GLYPH_ID; - } - - /* - * 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, valid ); - p += valid->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, valid ); - p += valid->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; - } - } - } - - valid->subtable_length = p - table; - - GXV_EXIT; - } - - - static FT_Bool - gxv_kern_coverage_new_apple_validate( FT_UShort coverage, - FT_UShort* format, - GXV_Validator valid ) - { - /* new Apple-dialect */ - FT_Bool kernVertical; - FT_Bool kernCrossStream; - FT_Bool kernVariation; - - FT_UNUSED( valid ); - - - /* reserved bits = 0 */ - if ( coverage & 0x1FFC ) - return 0; - - kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 ); - kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 ); - kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 ); - - *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 1; - } - - - static FT_Bool - gxv_kern_coverage_classic_apple_validate( FT_UShort coverage, - FT_UShort* format, - GXV_Validator valid ) - { - /* classic Apple-dialect */ - FT_Bool horizontal; - FT_Bool cross_stream; - - - /* check expected flags, but don't check if MS-dialect is impossible */ - if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( valid ) ) - return 0; - - /* reserved bits = 0 */ - if ( coverage & 0x02FC ) - return 0; - - horizontal = FT_BOOL( ( coverage >> 15 ) & 1 ); - cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 ); - - *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 0; - - GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); - - return 1; - } - - - static FT_Bool - gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage, - FT_UShort* format, - GXV_Validator valid ) - { - /* classic Microsoft-dialect */ - FT_Bool horizontal; - FT_Bool minimum; - FT_Bool cross_stream; - FT_Bool override; - - FT_UNUSED( valid ); - - - /* reserved bits = 0 */ - if ( coverage & 0xFDF0 ) - return 0; - - horizontal = FT_BOOL( coverage & 1 ); - minimum = FT_BOOL( ( coverage >> 1 ) & 1 ); - cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 ); - override = FT_BOOL( ( coverage >> 3 ) & 1 ); - - *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 1; - } - - - /*************************************************************************/ - /*************************************************************************/ - /***** *****/ - /***** MAIN *****/ - /***** *****/ - /*************************************************************************/ - /*************************************************************************/ - - static GXV_kern_Dialect - gxv_kern_coverage_validate( FT_UShort coverage, - FT_UShort* format, - GXV_Validator valid ) - { - GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN; - - - GXV_NAME_ENTER( "validating coverage" ); - - GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage )); - - if ( KERN_IS_NEW( valid ) ) - { - if ( gxv_kern_coverage_new_apple_validate( coverage, - format, - valid ) ) - { - result = KERN_DIALECT_APPLE; - goto Exit; - } - } - - if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_APPLE( valid ) ) - { - if ( gxv_kern_coverage_classic_apple_validate( coverage, - format, - valid ) ) - { - result = KERN_DIALECT_APPLE; - goto Exit; - } - } - - if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_MS( valid ) ) - { - if ( gxv_kern_coverage_classic_microsoft_validate( coverage, - format, - valid ) ) - { - result = KERN_DIALECT_MS; - goto Exit; - } - } - - GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" )); - - Exit: - GXV_EXIT; - return result; - } - - - static void - gxv_kern_subtable_validate( FT_Bytes table, - FT_Bytes limit, - GXV_Validator valid ) - { - FT_Bytes p = table; - FT_UShort version = 0; /* MS only: subtable version, unused */ - FT_ULong length; /* MS: 16bit, Apple: 32bit*/ - FT_UShort coverage; - FT_UShort tupleIndex = 0; /* Apple only */ - 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, valid ) ) - { - case KERN_DIALECT_MS: - version = u16[0]; - length = u16[1]; - tupleIndex = 0; - GXV_TRACE(( "Subtable version = %d\n", version )); - GXV_TRACE(( "Subtable length = %d\n", length )); - break; - - case KERN_DIALECT_APPLE: - version = 0; - length = ( u16[0] << 16 ) + u16[1]; - tupleIndex = 0; - GXV_TRACE(( "Subtable length = %d\n", length )); - - if ( KERN_IS_NEW( valid ) ) - { - GXV_LIMIT_CHECK( 2 ); - tupleIndex = FT_NEXT_USHORT( p ); - GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex )); - } - break; - - default: - length = u16[1]; - GXV_TRACE(( "cannot detect subtable dialect, " - "just skip %d 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, valid ); - else if ( format == 1 ) - gxv_kern_subtable_fmt1_validate( table, table + length, valid ); - else if ( format == 2 ) - gxv_kern_subtable_fmt2_validate( table, table + length, valid ); - else if ( format == 3 ) - gxv_kern_subtable_fmt3_validate( table, table + length, valid ); - else - FT_INVALID_DATA; - - Exit: - valid->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 validrec; - GXV_Validator valid = &validrec; - - GXV_kern_DataRec kernrec; - GXV_kern_Data kern = &kernrec; - - FT_Bytes p = table; - FT_Bytes limit = 0; - - FT_ULong nTables = 0; - FT_UInt i; - - - valid->root = ftvalid; - valid->table_data = kern; - valid->face = face; - - FT_TRACE3(( "validating `kern' table\n" )); - GXV_INIT; - KERN_DIALECT( valid ) = 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( valid ) ) - { - GXV_LIMIT_CHECK( 2 ); - nTables = FT_NEXT_USHORT( p ); - } - else if ( KERN_IS_NEW( valid ) ) - { - 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/%d\n", i, nTables )); - /* p should be 32bit-aligned? */ - gxv_kern_subtable_validate( p, 0, valid ); - p += valid->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 */ |