| /**************************************************************************** |
| * |
| * gxvlcar.c |
| * |
| * TrueTypeGX/AAT lcar 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 gxvlcar |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** Data and Types *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef struct GXV_lcar_DataRec_ |
| { |
| FT_UShort format; |
| |
| } GXV_lcar_DataRec, *GXV_lcar_Data; |
| |
| |
| #define GXV_LCAR_DATA( FIELD ) GXV_TABLE_DATA( lcar, FIELD ) |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** UTILITY FUNCTIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| gxv_lcar_partial_validate( FT_Short partial, |
| FT_UShort glyph, |
| GXV_Validator gxvalid ) |
| { |
| GXV_NAME_ENTER( "partial" ); |
| |
| if ( GXV_LCAR_DATA( format ) != 1 ) |
| goto Exit; |
| |
| gxv_ctlPoint_validate( glyph, (FT_UShort)partial, gxvalid ); |
| |
| Exit: |
| GXV_EXIT; |
| } |
| |
| |
| static void |
| gxv_lcar_LookupValue_validate( FT_UShort glyph, |
| GXV_LookupValueCPtr value_p, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = gxvalid->root->base + value_p->u; |
| FT_Bytes limit = gxvalid->root->limit; |
| FT_UShort count; |
| FT_Short partial; |
| FT_UShort i; |
| |
| |
| GXV_NAME_ENTER( "element in lookupTable" ); |
| |
| GXV_LIMIT_CHECK( 2 ); |
| count = FT_NEXT_USHORT( p ); |
| |
| GXV_LIMIT_CHECK( 2 * count ); |
| for ( i = 0; i < count; i++ ) |
| { |
| partial = FT_NEXT_SHORT( p ); |
| gxv_lcar_partial_validate( partial, glyph, gxvalid ); |
| } |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* |
| +------ lcar --------------------+ |
| | | |
| | +===============+ | |
| | | lookup header | | |
| | +===============+ | |
| | | BinSrchHeader | | |
| | +===============+ | |
| | | lastGlyph[0] | | |
| | +---------------+ | |
| | | firstGlyph[0] | | head of lcar sfnt table |
| | +---------------+ | + |
| | | offset[0] | -> | offset [byte] |
| | +===============+ | + |
| | | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] |
| | +---------------+ | |
| | | firstGlyph[1] | | |
| | +---------------+ | |
| | | offset[1] | | |
| | +===============+ | |
| | | |
| | .... | |
| | | |
| | 16bit value array | |
| | +===============+ | |
| +------| value | <-------+ |
| | .... |
| | |
| | |
| | |
| | |
| | |
| +----> lcar values...handled by lcar callback function |
| */ |
| |
| static GXV_LookupValueDesc |
| gxv_lcar_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; |
| |
| FT_UNUSED( lookuptbl_limit ); |
| |
| /* XXX: check range? */ |
| offset = (FT_UShort)( base_value_p->u + |
| relative_gindex * sizeof ( FT_UShort ) ); |
| p = gxvalid->root->base + offset; |
| limit = gxvalid->root->limit; |
| |
| GXV_LIMIT_CHECK ( 2 ); |
| value.u = FT_NEXT_USHORT( p ); |
| |
| return value; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** lcar TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| gxv_lcar_validate( FT_Bytes table, |
| FT_Face face, |
| FT_Validator ftvalid ) |
| { |
| FT_Bytes p = table; |
| FT_Bytes limit = 0; |
| GXV_ValidatorRec gxvalidrec; |
| GXV_Validator gxvalid = &gxvalidrec; |
| |
| GXV_lcar_DataRec lcarrec; |
| GXV_lcar_Data lcar = &lcarrec; |
| |
| FT_Fixed version; |
| |
| |
| gxvalid->root = ftvalid; |
| gxvalid->table_data = lcar; |
| gxvalid->face = face; |
| |
| FT_TRACE3(( "validating `lcar' table\n" )); |
| GXV_INIT; |
| |
| GXV_LIMIT_CHECK( 4 + 2 ); |
| version = FT_NEXT_LONG( p ); |
| GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p ); |
| |
| if ( version != 0x00010000UL) |
| FT_INVALID_FORMAT; |
| |
| if ( GXV_LCAR_DATA( format ) > 1 ) |
| FT_INVALID_FORMAT; |
| |
| gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| gxvalid->lookupval_func = gxv_lcar_LookupValue_validate; |
| gxvalid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit; |
| gxv_LookupTable_validate( p, limit, gxvalid ); |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| /* END */ |