/***************************************************************************/ | |
/* */ | |
/* gxvlcar.c */ | |
/* */ | |
/* TrueTypeGX/AAT lcar table validation (body). */ | |
/* */ | |
/* Copyright 2004-2015 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 trace_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 --------------------+ | |
| | | |
| +===============+ | | |
| | looup 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 */ |