/src/freetype/src/gxvalid/gxvmorx.c
https://bitbucket.org/cabalistic/ogredeps/ · C · 199 lines · 118 code · 46 blank · 35 comment · 8 complexity · d917a49fd571a820a07ff145957a7d9f MD5 · raw file
- /***************************************************************************/
- /* */
- /* gxvmorx.c */
- /* */
- /* TrueTypeGX/AAT morx table validation (body). */
- /* */
- /* Copyright 2005, 2008 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 "gxvmorx.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_gxvmorx
- static void
- gxv_morx_subtables_validate( FT_Bytes table,
- FT_Bytes limit,
- FT_UShort nSubtables,
- GXV_Validator valid )
- {
- FT_Bytes p = table;
- GXV_Validate_Func fmt_funcs_table[] =
- {
- gxv_morx_subtable_type0_validate, /* 0 */
- gxv_morx_subtable_type1_validate, /* 1 */
- gxv_morx_subtable_type2_validate, /* 2 */
- NULL, /* 3 */
- gxv_morx_subtable_type4_validate, /* 4 */
- gxv_morx_subtable_type5_validate, /* 5 */
- };
- GXV_Validate_Func func;
- FT_UShort i;
- GXV_NAME_ENTER( "subtables in a chain" );
- for ( i = 0; i < nSubtables; i++ )
- {
- FT_ULong length;
- FT_ULong coverage;
- #ifdef GXV_LOAD_UNUSED_VARS
- FT_ULong subFeatureFlags;
- #endif
- FT_ULong type;
- FT_ULong rest;
- GXV_LIMIT_CHECK( 4 + 4 + 4 );
- length = FT_NEXT_ULONG( p );
- coverage = FT_NEXT_ULONG( p );
- #ifdef GXV_LOAD_UNUSED_VARS
- subFeatureFlags = FT_NEXT_ULONG( p );
- #else
- p += 4;
- #endif
- GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
- i + 1, nSubtables, length ));
- type = coverage & 0x0007;
- rest = length - ( 4 + 4 + 4 );
- GXV_LIMIT_CHECK( rest );
- /* morx coverage consists of mort_coverage & 16bit padding */
- gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),
- valid );
- if ( type > 5 )
- FT_INVALID_FORMAT;
- func = fmt_funcs_table[type];
- if ( func == NULL )
- GXV_TRACE(( "morx type %d is reserved\n", type ));
- func( p, p + rest, valid );
- /* TODO: subFeatureFlags should be unique in a table? */
- p += rest;
- }
- valid->subtable_length = p - table;
- GXV_EXIT;
- }
- static void
- gxv_morx_chain_validate( FT_Bytes table,
- FT_Bytes limit,
- GXV_Validator valid )
- {
- FT_Bytes p = table;
- #ifdef GXV_LOAD_UNUSED_VARS
- FT_ULong defaultFlags;
- #endif
- FT_ULong chainLength;
- FT_ULong nFeatureFlags;
- FT_ULong nSubtables;
- GXV_NAME_ENTER( "morx chain header" );
- GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
- #ifdef GXV_LOAD_UNUSED_VARS
- defaultFlags = FT_NEXT_ULONG( p );
- #else
- p += 4;
- #endif
- chainLength = FT_NEXT_ULONG( p );
- nFeatureFlags = FT_NEXT_ULONG( p );
- nSubtables = FT_NEXT_ULONG( p );
- /* feature-array of morx is same with that of mort */
- gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid );
- p += valid->subtable_length;
- if ( nSubtables >= 0x10000L )
- FT_INVALID_DATA;
- gxv_morx_subtables_validate( p, table + chainLength,
- (FT_UShort)nSubtables, valid );
- valid->subtable_length = chainLength;
- /* TODO: defaultFlags should be compared with the flags in tables */
- GXV_EXIT;
- }
- FT_LOCAL_DEF( void )
- gxv_morx_validate( FT_Bytes table,
- FT_Face face,
- FT_Validator ftvalid )
- {
- GXV_ValidatorRec validrec;
- GXV_Validator valid = &validrec;
- FT_Bytes p = table;
- FT_Bytes limit = 0;
- FT_ULong version;
- FT_ULong nChains;
- FT_ULong i;
- valid->root = ftvalid;
- valid->face = face;
- FT_TRACE3(( "validating `morx' table\n" ));
- GXV_INIT;
- GXV_LIMIT_CHECK( 4 + 4 );
- version = FT_NEXT_ULONG( p );
- nChains = FT_NEXT_ULONG( p );
- if ( version != 0x00020000UL )
- FT_INVALID_FORMAT;
- for ( i = 0; i < nChains; i++ )
- {
- GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));
- GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
- gxv_morx_chain_validate( p, limit, valid );
- p += valid->subtable_length;
- }
- FT_TRACE4(( "\n" ));
- }
- /* END */