WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/freetype/src/gxvalid/gxvprop.c

Rev	Author	Line No.	Line
4349	Serge	1	/***************************************************************************/
		2	/* */
		3	/* gxvprop.c */
		4	/* */
		5	/* TrueTypeGX/AAT prop table validation (body). */
		6	/* */
		7	/* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
		8	/* David Turner, Robert Wilhelm, and Werner Lemberg. */
		9	/* */
		10	/* This file is part of the FreeType project, and may only be used, */
		11	/* modified, and distributed under the terms of the FreeType project */
		12	/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
		13	/* this file you indicate that you have read the license and */
		14	/* understand and accept it fully. */
		15	/* */
		16	/***************************************************************************/
		17
		18	/***************************************************************************/
		19	/* */
		20	/* gxvalid is derived from both gxlayout module and otvalid module. */
		21	/* Development of gxlayout is supported by the Information-technology */
		22	/* Promotion Agency(IPA), Japan. */
		23	/* */
		24	/***************************************************************************/
		25
		26
		27	#include "gxvalid.h"
		28	#include "gxvcommn.h"
		29
		30
		31	/*************************************************************************/
		32	/* */
		33	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
		34	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
		35	/* messages during execution. */
		36	/* */
		37	#undef FT_COMPONENT
		38	#define FT_COMPONENT trace_gxvprop
		39
		40
		41	/*************************************************************************/
		42	/*************************************************************************/
		43	/*** ***/
		44	/*** Data and Types ***/
		45	/*** ***/
		46	/*************************************************************************/
		47	/*************************************************************************/
		48
		49	#define GXV_PROP_HEADER_SIZE ( 4 + 2 + 2 )
		50	#define GXV_PROP_SIZE_MIN GXV_PROP_HEADER_SIZE
		51
		52	typedef struct GXV_prop_DataRec_
		53	{
		54	FT_Fixed version;
		55
		56	} GXV_prop_DataRec, *GXV_prop_Data;
		57
		58	#define GXV_PROP_DATA( field ) GXV_TABLE_DATA( prop, field )
		59
		60	#define GXV_PROP_FLOATER 0x8000U
		61	#define GXV_PROP_USE_COMPLEMENTARY_BRACKET 0x1000U
		62	#define GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET 0x0F00U
		63	#define GXV_PROP_ATTACHING_TO_RIGHT 0x0080U
		64	#define GXV_PROP_RESERVED 0x0060U
		65	#define GXV_PROP_DIRECTIONALITY_CLASS 0x001FU
		66
		67
		68	/*************************************************************************/
		69	/*************************************************************************/
		70	/*** ***/
		71	/*** UTILITY FUNCTIONS ***/
		72	/*** ***/
		73	/*************************************************************************/
		74	/*************************************************************************/
		75
		76	static void
		77	gxv_prop_zero_advance_validate( FT_UShort gid,
		78	GXV_Validator valid )
		79	{
		80	FT_Face face;
		81	FT_Error error;
		82	FT_GlyphSlot glyph;
		83
		84
		85	GXV_NAME_ENTER( "zero advance" );
		86
		87	face = valid->face;
		88
		89	error = FT_Load_Glyph( face,
		90	gid,
		91	FT_LOAD_IGNORE_TRANSFORM );
		92	if ( error )
		93	FT_INVALID_GLYPH_ID;
		94
		95	glyph = face->glyph;
		96
		97	if ( glyph->advance.x != (FT_Pos)0 \|\|
		98	glyph->advance.y != (FT_Pos)0 )
		99	{
		100	GXV_TRACE(( " found non-zero advance in zero-advance glyph\n" ));
		101	FT_INVALID_DATA;
		102	}
		103
		104	GXV_EXIT;
		105	}
		106
		107
		108	/* Pass 0 as GLYPH to check the default property */
		109	static void
		110	gxv_prop_property_validate( FT_UShort property,
		111	FT_UShort glyph,
		112	GXV_Validator valid )
		113	{
		114	if ( glyph != 0 && ( property & GXV_PROP_FLOATER ) )
		115	gxv_prop_zero_advance_validate( glyph, valid );
		116
		117	if ( property & GXV_PROP_USE_COMPLEMENTARY_BRACKET )
		118	{
		119	FT_UShort offset;
		120	char complement;
		121
		122
		123	offset = (FT_UShort)( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET );
		124	if ( offset == 0 )
		125	{
		126	GXV_TRACE(( " found zero offset to property\n" ));
		127	FT_INVALID_OFFSET;
		128	}
		129
		130	complement = (char)( offset >> 8 );
		131	if ( complement & 0x08 )
		132	{
		133	/* Top bit is set: negative */
		134
		135	/* Calculate the absolute offset */
		136	complement = (char)( ( complement & 0x07 ) + 1 );
		137
		138	/* The gid for complement must be greater than 0 */
		139	if ( glyph <= complement )
		140	{
		141	GXV_TRACE(( " found non-positive glyph complement\n" ));
		142	FT_INVALID_DATA;
		143	}
		144	}
		145	else
		146	{
		147	/* The gid for complement must be the face. */
		148	gxv_glyphid_validate( (FT_UShort)( glyph + complement ), valid );
		149	}
		150	}
		151	else
		152	{
		153	if ( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET )
		154	GXV_TRACE(( "glyph %d cannot have complementary bracketing\n",
		155	glyph ));
		156	}
		157
		158	/* this is introduced in version 2.0 */
		159	if ( property & GXV_PROP_ATTACHING_TO_RIGHT )
		160	{
		161	if ( GXV_PROP_DATA( version ) == 0x00010000UL )
		162	{
		163	GXV_TRACE(( " found older version (1.0) in new version table\n" ));
		164	FT_INVALID_DATA;
		165	}
		166	}
		167
		168	if ( property & GXV_PROP_RESERVED )
		169	{
		170	GXV_TRACE(( " found non-zero bits in reserved bits\n" ));
		171	FT_INVALID_DATA;
		172	}
		173
		174	if ( ( property & GXV_PROP_DIRECTIONALITY_CLASS ) > 11 )
		175	{
		176	/* TODO: Too restricted. Use the validation level. */
		177	if ( GXV_PROP_DATA( version ) == 0x00010000UL \|\|
		178	GXV_PROP_DATA( version ) == 0x00020000UL )
		179	{
		180	GXV_TRACE(( " found too old version in directionality class\n" ));
		181	FT_INVALID_DATA;
		182	}
		183	}
		184	}
		185
		186
		187	static void
		188	gxv_prop_LookupValue_validate( FT_UShort glyph,
		189	GXV_LookupValueCPtr value_p,
		190	GXV_Validator valid )
		191	{
		192	gxv_prop_property_validate( value_p->u, glyph, valid );
		193	}
		194
		195
		196	/*
		197	+===============+ --------+
		198	\| lookup header \| \|
		199	+===============+ \|
		200	\| BinSrchHeader \| \|
		201	+===============+ \|
		202	\| lastGlyph[0] \| \|
		203	+---------------+ \|
		204	\| firstGlyph[0] \| \| head of lookup table
		205	+---------------+ \| +
		206	\| offset[0] \| -> \| offset [byte]
		207	+===============+ \| +
		208	\| lastGlyph[1] \| \| (glyphID - firstGlyph) * 2 [byte]
		209	+---------------+ \|
		210	\| firstGlyph[1] \| \|
		211	+---------------+ \|
		212	\| offset[1] \| \|
		213	+===============+ \|
		214	\|
		215	... \|
		216	\|
		217	16bit value array \|
		218	+===============+ \|
		219	\| value \| <-------+
		220	...
		221	*/
		222
		223	static GXV_LookupValueDesc
		224	gxv_prop_LookupFmt4_transit( FT_UShort relative_gindex,
		225	GXV_LookupValueCPtr base_value_p,
		226	FT_Bytes lookuptbl_limit,
		227	GXV_Validator valid )
		228	{
		229	FT_Bytes p;
		230	FT_Bytes limit;
		231	FT_UShort offset;
		232	GXV_LookupValueDesc value;
		233
		234	/* XXX: check range? */
		235	offset = (FT_UShort)( base_value_p->u +
		236	relative_gindex * sizeof ( FT_UShort ) );
		237	p = valid->lookuptbl_head + offset;
		238	limit = lookuptbl_limit;
		239
		240	GXV_LIMIT_CHECK ( 2 );
		241	value.u = FT_NEXT_USHORT( p );
		242
		243	return value;
		244	}
		245
		246
		247	/*************************************************************************/
		248	/*************************************************************************/
		249	/*** ***/
		250	/*** prop TABLE ***/
		251	/*** ***/
		252	/*************************************************************************/
		253	/*************************************************************************/
		254
		255	FT_LOCAL_DEF( void )
		256	gxv_prop_validate( FT_Bytes table,
		257	FT_Face face,
		258	FT_Validator ftvalid )
		259	{
		260	FT_Bytes p = table;
		261	FT_Bytes limit = 0;
		262	GXV_ValidatorRec validrec;
		263	GXV_Validator valid = &validrec;
		264
		265	GXV_prop_DataRec proprec;
		266	GXV_prop_Data prop = &proprec;
		267
		268	FT_Fixed version;
		269	FT_UShort format;
		270	FT_UShort defaultProp;
		271
		272
		273	valid->root = ftvalid;
		274	valid->table_data = prop;
		275	valid->face = face;
		276
		277	FT_TRACE3(( "validating `prop' table\n" ));
		278	GXV_INIT;
		279
		280	GXV_LIMIT_CHECK( 4 + 2 + 2 );
		281	version = FT_NEXT_ULONG( p );
		282	format = FT_NEXT_USHORT( p );
		283	defaultProp = FT_NEXT_USHORT( p );
		284
		285	GXV_TRACE(( " version 0x%08x\n", version ));
		286	GXV_TRACE(( " format 0x%04x\n", format ));
		287	GXV_TRACE(( " defaultProp 0x%04x\n", defaultProp ));
		288
		289	/* only versions 1.0, 2.0, 3.0 are defined (1996) */
		290	if ( version != 0x00010000UL &&
		291	version != 0x00020000UL &&
		292	version != 0x00030000UL )
		293	{
		294	GXV_TRACE(( " found unknown version\n" ));
		295	FT_INVALID_FORMAT;
		296	}
		297
		298
		299	/* only formats 0x0000, 0x0001 are defined (1996) */
		300	if ( format > 1 )
		301	{
		302	GXV_TRACE(( " found unknown format\n" ));
		303	FT_INVALID_FORMAT;
		304	}
		305
		306	gxv_prop_property_validate( defaultProp, 0, valid );
		307
		308	if ( format == 0 )
		309	{
		310	FT_TRACE3(( "(format 0, no per-glyph properties, "
		311	"remaining %d bytes are skipped)", limit - p ));
		312	goto Exit;
		313	}
		314
		315	/* format == 1 */
		316	GXV_PROP_DATA( version ) = version;
		317
		318	valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
		319	valid->lookupval_func = gxv_prop_LookupValue_validate;
		320	valid->lookupfmt4_trans = gxv_prop_LookupFmt4_transit;
		321
		322	gxv_LookupTable_validate( p, limit, valid );
		323
		324	Exit:
		325	FT_TRACE4(( "\n" ));
		326	}
		327
		328
		329	/* END */

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(root)/contrib/sdk/sources/freetype/src/gxvalid/gxvprop.c – Rev 7917