| /**************************************************************************** |
| * |
| * gxvbsln.c |
| * |
| * TrueTypeGX/AAT bsln table validation (body). |
| * |
| * Copyright (C) 2004-2021 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 gxvbsln |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** Data and Types *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #define GXV_BSLN_VALUE_COUNT 32 |
| #define GXV_BSLN_VALUE_EMPTY 0xFFFFU |
| |
| |
| typedef struct GXV_bsln_DataRec_ |
| { |
| FT_Bytes ctlPoints_p; |
| FT_UShort defaultBaseline; |
| |
| } GXV_bsln_DataRec, *GXV_bsln_Data; |
| |
| |
| #define GXV_BSLN_DATA( field ) GXV_TABLE_DATA( bsln, field ) |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** UTILITY FUNCTIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| gxv_bsln_LookupValue_validate( FT_UShort glyph, |
| GXV_LookupValueCPtr value_p, |
| GXV_Validator gxvalid ) |
| { |
| FT_UShort v = value_p->u; |
| FT_UShort* ctlPoints; |
| |
| FT_UNUSED( glyph ); |
| |
| |
| GXV_NAME_ENTER( "lookup value" ); |
| |
| if ( v >= GXV_BSLN_VALUE_COUNT ) |
| FT_INVALID_DATA; |
| |
| ctlPoints = (FT_UShort*)GXV_BSLN_DATA( ctlPoints_p ); |
| if ( ctlPoints && ctlPoints[v] == GXV_BSLN_VALUE_EMPTY ) |
| FT_INVALID_DATA; |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* |
| +===============+ --------+ |
| | lookup header | | |
| +===============+ | |
| | BinSrchHeader | | |
| +===============+ | |
| | lastGlyph[0] | | |
| +---------------+ | |
| | firstGlyph[0] | | head of lookup table |
| +---------------+ | + |
| | offset[0] | -> | offset [byte] |
| +===============+ | + |
| | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] |
| +---------------+ | |
| | firstGlyph[1] | | |
| +---------------+ | |
| | offset[1] | | |
| +===============+ | |
| | |
| ... | |
| | |
| 16bit value array | |
| +===============+ | |
| | value | <-------+ |
| ... |
| */ |
| |
| static GXV_LookupValueDesc |
| gxv_bsln_LookupFmt4_transit( FT_UShort relative_gindex, |
| GXV_LookupValueCPtr base_value_p, |
| FT_Bytes lookuptbl_limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p; |
| FT_Bytes limit; |
| FT_UShort offset; |
| GXV_LookupValueDesc value; |
| |
| /* XXX: check range ? */ |
| offset = (FT_UShort)( base_value_p->u + |
| ( relative_gindex * sizeof ( FT_UShort ) ) ); |
| |
| p = gxvalid->lookuptbl_head + offset; |
| limit = lookuptbl_limit; |
| GXV_LIMIT_CHECK( 2 ); |
| |
| value.u = FT_NEXT_USHORT( p ); |
| |
| return value; |
| } |
| |
| |
| static void |
| gxv_bsln_parts_fmt0_validate( FT_Bytes tables, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = tables; |
| |
| |
| GXV_NAME_ENTER( "parts format 0" ); |
| |
| /* deltas */ |
| GXV_LIMIT_CHECK( 2 * GXV_BSLN_VALUE_COUNT ); |
| |
| gxvalid->table_data = NULL; /* No ctlPoints here. */ |
| |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_bsln_parts_fmt1_validate( FT_Bytes tables, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = tables; |
| |
| |
| GXV_NAME_ENTER( "parts format 1" ); |
| |
| /* deltas */ |
| gxv_bsln_parts_fmt0_validate( p, limit, gxvalid ); |
| |
| /* mappingData */ |
| gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| gxvalid->lookupval_func = gxv_bsln_LookupValue_validate; |
| gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit; |
| gxv_LookupTable_validate( p + 2 * GXV_BSLN_VALUE_COUNT, |
| limit, |
| gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_bsln_parts_fmt2_validate( FT_Bytes tables, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = tables; |
| |
| FT_UShort stdGlyph; |
| FT_UShort ctlPoint; |
| FT_Int i; |
| |
| FT_UShort defaultBaseline = GXV_BSLN_DATA( defaultBaseline ); |
| |
| |
| GXV_NAME_ENTER( "parts format 2" ); |
| |
| GXV_LIMIT_CHECK( 2 + ( 2 * GXV_BSLN_VALUE_COUNT ) ); |
| |
| /* stdGlyph */ |
| stdGlyph = FT_NEXT_USHORT( p ); |
| GXV_TRACE(( " (stdGlyph = %u)\n", stdGlyph )); |
| |
| gxv_glyphid_validate( stdGlyph, gxvalid ); |
| |
| /* Record the position of ctlPoints */ |
| GXV_BSLN_DATA( ctlPoints_p ) = p; |
| |
| /* ctlPoints */ |
| for ( i = 0; i < GXV_BSLN_VALUE_COUNT; i++ ) |
| { |
| ctlPoint = FT_NEXT_USHORT( p ); |
| if ( ctlPoint == GXV_BSLN_VALUE_EMPTY ) |
| { |
| if ( i == defaultBaseline ) |
| FT_INVALID_DATA; |
| } |
| else |
| gxv_ctlPoint_validate( stdGlyph, ctlPoint, gxvalid ); |
| } |
| |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_bsln_parts_fmt3_validate( FT_Bytes tables, |
| FT_Bytes limit, |
| GXV_Validator gxvalid) |
| { |
| FT_Bytes p = tables; |
| |
| |
| GXV_NAME_ENTER( "parts format 3" ); |
| |
| /* stdGlyph + ctlPoints */ |
| gxv_bsln_parts_fmt2_validate( p, limit, gxvalid ); |
| |
| /* mappingData */ |
| gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| gxvalid->lookupval_func = gxv_bsln_LookupValue_validate; |
| gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit; |
| gxv_LookupTable_validate( p + ( 2 + 2 * GXV_BSLN_VALUE_COUNT ), |
| limit, |
| gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** bsln TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| gxv_bsln_validate( FT_Bytes table, |
| FT_Face face, |
| FT_Validator ftvalid ) |
| { |
| GXV_ValidatorRec gxvalidrec; |
| GXV_Validator gxvalid = &gxvalidrec; |
| |
| GXV_bsln_DataRec bslnrec; |
| GXV_bsln_Data bsln = &bslnrec; |
| |
| FT_Bytes p = table; |
| FT_Bytes limit = 0; |
| |
| FT_ULong version; |
| FT_UShort format; |
| FT_UShort defaultBaseline; |
| |
| GXV_Validate_Func fmt_funcs_table [] = |
| { |
| gxv_bsln_parts_fmt0_validate, |
| gxv_bsln_parts_fmt1_validate, |
| gxv_bsln_parts_fmt2_validate, |
| gxv_bsln_parts_fmt3_validate, |
| }; |
| |
| |
| gxvalid->root = ftvalid; |
| gxvalid->table_data = bsln; |
| gxvalid->face = face; |
| |
| FT_TRACE3(( "validating `bsln' table\n" )); |
| GXV_INIT; |
| |
| |
| GXV_LIMIT_CHECK( 4 + 2 + 2 ); |
| version = FT_NEXT_ULONG( p ); |
| format = FT_NEXT_USHORT( p ); |
| defaultBaseline = FT_NEXT_USHORT( p ); |
| |
| /* only version 1.0 is defined (1996) */ |
| if ( version != 0x00010000UL ) |
| FT_INVALID_FORMAT; |
| |
| /* only format 1, 2, 3 are defined (1996) */ |
| GXV_TRACE(( " (format = %d)\n", format )); |
| if ( format > 3 ) |
| FT_INVALID_FORMAT; |
| |
| if ( defaultBaseline > 31 ) |
| FT_INVALID_FORMAT; |
| |
| bsln->defaultBaseline = defaultBaseline; |
| |
| fmt_funcs_table[format]( p, limit, gxvalid ); |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| /* arch-tag: ebe81143-fdaa-4c68-a4d1-b57227daa3bc |
| (do not change this comment) */ |
| |
| |
| /* END */ |
