| /**************************************************************************** |
| * |
| * gxvopbd.c |
| * |
| * TrueTypeGX/AAT opbd 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" |
| |
| |
| /************************************************************************** |
| * |
| * 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 gxvopbd |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** Data and Types *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef struct GXV_opbd_DataRec_ |
| { |
| FT_UShort format; |
| FT_UShort valueOffset_min; |
| |
| } GXV_opbd_DataRec, *GXV_opbd_Data; |
| |
| |
| #define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD ) |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** UTILITY FUNCTIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| gxv_opbd_LookupValue_validate( FT_UShort glyph, |
| GXV_LookupValueCPtr value_p, |
| GXV_Validator gxvalid ) |
| { |
| /* offset in LookupTable is measured from the head of opbd table */ |
| FT_Bytes p = gxvalid->root->base + value_p->u; |
| FT_Bytes limit = gxvalid->root->limit; |
| FT_Short delta_value; |
| int i; |
| |
| |
| if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) ) |
| GXV_OPBD_DATA( valueOffset_min ) = value_p->u; |
| |
| for ( i = 0; i < 4; i++ ) |
| { |
| GXV_LIMIT_CHECK( 2 ); |
| delta_value = FT_NEXT_SHORT( p ); |
| |
| if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */ |
| { |
| if ( delta_value == -1 ) |
| continue; |
| |
| gxv_ctlPoint_validate( glyph, (FT_UShort)delta_value, gxvalid ); |
| } |
| else /* format 0, value is distance */ |
| continue; |
| } |
| } |
| |
| |
| /* |
| opbd ---------------------+ |
| | |
| +===============+ | |
| | lookup header | | |
| +===============+ | |
| | BinSrchHeader | | |
| +===============+ | |
| | lastGlyph[0] | | |
| +---------------+ | |
| | firstGlyph[0] | | head of opbd sfnt table |
| +---------------+ | + |
| | offset[0] | -> | offset [byte] |
| +===============+ | + |
| | lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte] |
| +---------------+ | |
| | firstGlyph[1] | | |
| +---------------+ | |
| | offset[1] | | |
| +===============+ | |
| | |
| .... | |
| | |
| 48bit value array | |
| +===============+ | |
| | value | <-------+ |
| | | |
| | | |
| | | |
| +---------------+ |
| .... */ |
| |
| static GXV_LookupValueDesc |
| gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex, |
| GXV_LookupValueCPtr base_value_p, |
| FT_Bytes lookuptbl_limit, |
| GXV_Validator gxvalid ) |
| { |
| GXV_LookupValueDesc value; |
| |
| FT_UNUSED( lookuptbl_limit ); |
| FT_UNUSED( gxvalid ); |
| |
| /* XXX: check range? */ |
| value.u = (FT_UShort)( base_value_p->u + |
| relative_gindex * 4 * sizeof ( FT_Short ) ); |
| |
| return value; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** opbd TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| gxv_opbd_validate( FT_Bytes table, |
| FT_Face face, |
| FT_Validator ftvalid ) |
| { |
| GXV_ValidatorRec gxvalidrec; |
| GXV_Validator gxvalid = &gxvalidrec; |
| GXV_opbd_DataRec opbdrec; |
| GXV_opbd_Data opbd = &opbdrec; |
| FT_Bytes p = table; |
| FT_Bytes limit = 0; |
| |
| FT_ULong version; |
| |
| |
| gxvalid->root = ftvalid; |
| gxvalid->table_data = opbd; |
| gxvalid->face = face; |
| |
| FT_TRACE3(( "validating `opbd' table\n" )); |
| GXV_INIT; |
| GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU; |
| |
| |
| GXV_LIMIT_CHECK( 4 + 2 ); |
| version = FT_NEXT_ULONG( p ); |
| GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p ); |
| |
| |
| /* only 0x00010000 is defined (1996) */ |
| GXV_TRACE(( "(version=0x%08lx)\n", version )); |
| if ( 0x00010000UL != version ) |
| FT_INVALID_FORMAT; |
| |
| /* only values 0 and 1 are defined (1996) */ |
| GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) )); |
| if ( 0x0001 < GXV_OPBD_DATA( format ) ) |
| FT_INVALID_FORMAT; |
| |
| gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| gxvalid->lookupval_func = gxv_opbd_LookupValue_validate; |
| gxvalid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit; |
| |
| gxv_LookupTable_validate( p, limit, gxvalid ); |
| p += gxvalid->subtable_length; |
| |
| if ( p > table + GXV_OPBD_DATA( valueOffset_min ) ) |
| { |
| GXV_TRACE(( |
| "found overlap between LookupTable and opbd_value array\n" )); |
| FT_INVALID_OFFSET; |
| } |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| /* END */ |