Edit
kc3-lang/freetype/src/gxvalid/gxvbsln.c
Alexei Podtelezhnikov
- src/gxvalid/gxvbsln.c
-
/**************************************************************************** * * gxvbsln.c * * TrueTypeGX/AAT bsln table validation (body). * * Copyright (C) 2004-2024 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 */