ref: 7f7bf6f0f0b707f84594a424d5e15fda8275887b
dir: /src/gxvalid/gxvlcar.c/
/**************************************************************************** * * 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 */