/***************************************************************************/ | |
/* */ | |
/* gxvbsln.c */ | |
/* */ | |
/* TrueTypeGX/AAT bsln 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_gxvbsln | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** Data and Types *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
#define GXV_BSLN_VALUE_COUNT 32 | |
#define GXV_BSLN_VALUE_EMPTY 0xFFFFU | |
typedef struct GXV_bsln_DataRec_ | |
{ | |
FT_Bytes ctlPoints_p; | |
FT_UShort defaultBaseline; | |
} GXV_bsln_DataRec, *GXV_bsln_Data; | |
#define GXV_BSLN_DATA( field ) GXV_TABLE_DATA( bsln, field ) | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** UTILITY FUNCTIONS *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
static void | |
gxv_bsln_LookupValue_validate( FT_UShort glyph, | |
GXV_LookupValueCPtr value_p, | |
GXV_Validator gxvalid ) | |
{ | |
FT_UShort v = value_p->u; | |
FT_UShort* ctlPoints; | |
FT_UNUSED( glyph ); | |
GXV_NAME_ENTER( "lookup value" ); | |
if ( v >= GXV_BSLN_VALUE_COUNT ) | |
FT_INVALID_DATA; | |
ctlPoints = (FT_UShort*)GXV_BSLN_DATA( ctlPoints_p ); | |
if ( ctlPoints && ctlPoints[v] == GXV_BSLN_VALUE_EMPTY ) | |
FT_INVALID_DATA; | |
GXV_EXIT; | |
} | |
/* | |
+===============+ --------+ | |
| 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_bsln_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; | |
} | |
static void | |
gxv_bsln_parts_fmt0_validate( FT_Bytes tables, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = tables; | |
GXV_NAME_ENTER( "parts format 0" ); | |
/* deltas */ | |
GXV_LIMIT_CHECK( 2 * GXV_BSLN_VALUE_COUNT ); | |
gxvalid->table_data = NULL; /* No ctlPoints here. */ | |
GXV_EXIT; | |
} | |
static void | |
gxv_bsln_parts_fmt1_validate( FT_Bytes tables, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = tables; | |
GXV_NAME_ENTER( "parts format 1" ); | |
/* deltas */ | |
gxv_bsln_parts_fmt0_validate( p, limit, gxvalid ); | |
/* mappingData */ | |
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; | |
gxvalid->lookupval_func = gxv_bsln_LookupValue_validate; | |
gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit; | |
gxv_LookupTable_validate( p + 2 * GXV_BSLN_VALUE_COUNT, | |
limit, | |
gxvalid ); | |
GXV_EXIT; | |
} | |
static void | |
gxv_bsln_parts_fmt2_validate( FT_Bytes tables, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = tables; | |
FT_UShort stdGlyph; | |
FT_UShort ctlPoint; | |
FT_Int i; | |
FT_UShort defaultBaseline = GXV_BSLN_DATA( defaultBaseline ); | |
GXV_NAME_ENTER( "parts format 2" ); | |
GXV_LIMIT_CHECK( 2 + ( 2 * GXV_BSLN_VALUE_COUNT ) ); | |
/* stdGlyph */ | |
stdGlyph = FT_NEXT_USHORT( p ); | |
GXV_TRACE(( " (stdGlyph = %u)\n", stdGlyph )); | |
gxv_glyphid_validate( stdGlyph, gxvalid ); | |
/* Record the position of ctlPoints */ | |
GXV_BSLN_DATA( ctlPoints_p ) = p; | |
/* ctlPoints */ | |
for ( i = 0; i < GXV_BSLN_VALUE_COUNT; i++ ) | |
{ | |
ctlPoint = FT_NEXT_USHORT( p ); | |
if ( ctlPoint == GXV_BSLN_VALUE_EMPTY ) | |
{ | |
if ( i == defaultBaseline ) | |
FT_INVALID_DATA; | |
} | |
else | |
gxv_ctlPoint_validate( stdGlyph, ctlPoint, gxvalid ); | |
} | |
GXV_EXIT; | |
} | |
static void | |
gxv_bsln_parts_fmt3_validate( FT_Bytes tables, | |
FT_Bytes limit, | |
GXV_Validator gxvalid) | |
{ | |
FT_Bytes p = tables; | |
GXV_NAME_ENTER( "parts format 3" ); | |
/* stdGlyph + ctlPoints */ | |
gxv_bsln_parts_fmt2_validate( p, limit, gxvalid ); | |
/* mappingData */ | |
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; | |
gxvalid->lookupval_func = gxv_bsln_LookupValue_validate; | |
gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit; | |
gxv_LookupTable_validate( p + ( 2 + 2 * GXV_BSLN_VALUE_COUNT ), | |
limit, | |
gxvalid ); | |
GXV_EXIT; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** bsln TABLE *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
FT_LOCAL_DEF( void ) | |
gxv_bsln_validate( FT_Bytes table, | |
FT_Face face, | |
FT_Validator ftvalid ) | |
{ | |
GXV_ValidatorRec gxvalidrec; | |
GXV_Validator gxvalid = &gxvalidrec; | |
GXV_bsln_DataRec bslnrec; | |
GXV_bsln_Data bsln = &bslnrec; | |
FT_Bytes p = table; | |
FT_Bytes limit = 0; | |
FT_ULong version; | |
FT_UShort format; | |
FT_UShort defaultBaseline; | |
GXV_Validate_Func fmt_funcs_table [] = | |
{ | |
gxv_bsln_parts_fmt0_validate, | |
gxv_bsln_parts_fmt1_validate, | |
gxv_bsln_parts_fmt2_validate, | |
gxv_bsln_parts_fmt3_validate, | |
}; | |
gxvalid->root = ftvalid; | |
gxvalid->table_data = bsln; | |
gxvalid->face = face; | |
FT_TRACE3(( "validating `bsln' table\n" )); | |
GXV_INIT; | |
GXV_LIMIT_CHECK( 4 + 2 + 2 ); | |
version = FT_NEXT_ULONG( p ); | |
format = FT_NEXT_USHORT( p ); | |
defaultBaseline = FT_NEXT_USHORT( p ); | |
/* only version 1.0 is defined (1996) */ | |
if ( version != 0x00010000UL ) | |
FT_INVALID_FORMAT; | |
/* only format 1, 2, 3 are defined (1996) */ | |
GXV_TRACE(( " (format = %d)\n", format )); | |
if ( format > 3 ) | |
FT_INVALID_FORMAT; | |
if ( defaultBaseline > 31 ) | |
FT_INVALID_FORMAT; | |
bsln->defaultBaseline = defaultBaseline; | |
fmt_funcs_table[format]( p, limit, gxvalid ); | |
FT_TRACE4(( "\n" )); | |
} | |
/* arch-tag: ebe81143-fdaa-4c68-a4d1-b57227daa3bc | |
(do not change this comment) */ | |
/* END */ |