/***************************************************************************/ | |
/* */ | |
/* gxvopbd.c */ | |
/* */ | |
/* TrueTypeGX/AAT opbd 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_gxvopbd | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** Data and Types *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
typedef struct GXV_opbd_DataRec_ | |
{ | |
FT_UShort format; | |
FT_UShort valueOffset_min; | |
} GXV_opbd_DataRec, *GXV_opbd_Data; | |
#define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD ) | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** UTILITY FUNCTIONS *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
static void | |
gxv_opbd_LookupValue_validate( FT_UShort glyph, | |
GXV_LookupValueCPtr value_p, | |
GXV_Validator gxvalid ) | |
{ | |
/* offset in LookupTable is measured from the head of opbd table */ | |
FT_Bytes p = gxvalid->root->base + value_p->u; | |
FT_Bytes limit = gxvalid->root->limit; | |
FT_Short delta_value; | |
int i; | |
if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) ) | |
GXV_OPBD_DATA( valueOffset_min ) = value_p->u; | |
for ( i = 0; i < 4; i++ ) | |
{ | |
GXV_LIMIT_CHECK( 2 ); | |
delta_value = FT_NEXT_SHORT( p ); | |
if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */ | |
{ | |
if ( delta_value == -1 ) | |
continue; | |
gxv_ctlPoint_validate( glyph, (FT_UShort)delta_value, gxvalid ); | |
} | |
else /* format 0, value is distance */ | |
continue; | |
} | |
} | |
/* | |
opbd ---------------------+ | |
| | |
+===============+ | | |
| lookup header | | | |
+===============+ | | |
| BinSrchHeader | | | |
+===============+ | | |
| lastGlyph[0] | | | |
+---------------+ | | |
| firstGlyph[0] | | head of opbd sfnt table | |
+---------------+ | + | |
| offset[0] | -> | offset [byte] | |
+===============+ | + | |
| lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte] | |
+---------------+ | | |
| firstGlyph[1] | | | |
+---------------+ | | |
| offset[1] | | | |
+===============+ | | |
| | |
.... | | |
| | |
48bit value array | | |
+===============+ | | |
| value | <-------+ | |
| | | |
| | | |
| | | |
+---------------+ | |
.... */ | |
static GXV_LookupValueDesc | |
gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex, | |
GXV_LookupValueCPtr base_value_p, | |
FT_Bytes lookuptbl_limit, | |
GXV_Validator gxvalid ) | |
{ | |
GXV_LookupValueDesc value; | |
FT_UNUSED( lookuptbl_limit ); | |
FT_UNUSED( gxvalid ); | |
/* XXX: check range? */ | |
value.u = (FT_UShort)( base_value_p->u + | |
relative_gindex * 4 * sizeof ( FT_Short ) ); | |
return value; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** opbd TABLE *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
FT_LOCAL_DEF( void ) | |
gxv_opbd_validate( FT_Bytes table, | |
FT_Face face, | |
FT_Validator ftvalid ) | |
{ | |
GXV_ValidatorRec gxvalidrec; | |
GXV_Validator gxvalid = &gxvalidrec; | |
GXV_opbd_DataRec opbdrec; | |
GXV_opbd_Data opbd = &opbdrec; | |
FT_Bytes p = table; | |
FT_Bytes limit = 0; | |
FT_ULong version; | |
gxvalid->root = ftvalid; | |
gxvalid->table_data = opbd; | |
gxvalid->face = face; | |
FT_TRACE3(( "validating `opbd' table\n" )); | |
GXV_INIT; | |
GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU; | |
GXV_LIMIT_CHECK( 4 + 2 ); | |
version = FT_NEXT_ULONG( p ); | |
GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p ); | |
/* only 0x00010000 is defined (1996) */ | |
GXV_TRACE(( "(version=0x%08x)\n", version )); | |
if ( 0x00010000UL != version ) | |
FT_INVALID_FORMAT; | |
/* only values 0 and 1 are defined (1996) */ | |
GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) )); | |
if ( 0x0001 < GXV_OPBD_DATA( format ) ) | |
FT_INVALID_FORMAT; | |
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; | |
gxvalid->lookupval_func = gxv_opbd_LookupValue_validate; | |
gxvalid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit; | |
gxv_LookupTable_validate( p, limit, gxvalid ); | |
p += gxvalid->subtable_length; | |
if ( p > table + GXV_OPBD_DATA( valueOffset_min ) ) | |
{ | |
GXV_TRACE(( | |
"found overlap between LookupTable and opbd_value array\n" )); | |
FT_INVALID_OFFSET; | |
} | |
FT_TRACE4(( "\n" )); | |
} | |
/* END */ |