ref: 4f35711844eb5931833467fe15568aed7b38a381
dir: /src/gxvalid/gxvbsln.c/
/****************************************************************************
*
* gxvbsln.c
*
* TrueTypeGX/AAT bsln table validation (body).
*
* Copyright (C) 2004-2021 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 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 */