| /**************************************************************************** |
| * |
| * gxvmort4.c |
| * |
| * TrueTypeGX/AAT mort table validation |
| * body for type4 (Non-Contextual Glyph Substitution) subtable. |
| * |
| * Copyright (C) 2005-2023 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 "gxvmort.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 gxvmort |
| |
| |
| static void |
| gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph, |
| GXV_LookupValueCPtr value_p, |
| GXV_Validator gxvalid ) |
| { |
| FT_UNUSED( glyph ); |
| |
| gxv_glyphid_validate( value_p->u, gxvalid ); |
| } |
| |
| /* |
| +===============+ --------+ |
| | 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_mort_subtable_type4_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; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| gxv_mort_subtable_type4_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| |
| |
| GXV_NAME_ENTER( "mort chain subtable type4 " |
| "(Non-Contextual Glyph Substitution)" ); |
| |
| gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| gxvalid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate; |
| gxvalid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit; |
| |
| gxv_LookupTable_validate( p, limit, gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* END */ |