ObjFW  Check-in [022994c409]

Overview
Comment:OFZIPArchive: Throw invalid format on failed seek
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | 0.8
Files: files | file ages | folders
SHA3-256: 022994c4092bda0d4b5fd494eafa9b226ca4b22ac21758cb13c8c6b500d4c5ae
User & Date: js on 2015-08-26 09:07:01
Other Links: branch diff | manifest | tags
Context
2015-09-06
15:51
Fix compilation for Wii check-in: cfbd50afe2 user: js tags: 0.8
2015-08-26
09:07
OFZIPArchive: Throw invalid format on failed seek check-in: 022994c409 user: js tags: 0.8
08:53
Make sure of_hash_seed is never initialized to 0 check-in: 1b09ca22f3 user: js tags: 0.8
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified src/OFZIPArchive.m from [da28dbf09c] to [a813c350e7].

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	*data += 8;
	*size -= 8;

	return field;
}

static uint32_t
crc32(uint32_t crc, uint8_t *bytes, size_t length)
{
	size_t i;

	for (i = 0; i < length; i++) {
		uint_fast8_t j;

		crc ^= bytes[i];

		for (j = 0; j < 8; j++)
			crc = (crc >> 1) ^ (CRC32_MAGIC & (~(crc & 1) + 1));
	}

	return crc;
}
















@implementation OFZIPArchive
+ (instancetype)archiveWithSeekableStream: (OFSeekableStream*)stream
{
	return [[[self alloc] initWithSeekableStream: stream] autorelease];
}









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	*data += 8;
	*size -= 8;

	return field;
}

static uint32_t
calculateCRC32(uint32_t crc, uint8_t *bytes, size_t length)
{
	size_t i;

	for (i = 0; i < length; i++) {
		uint_fast8_t j;

		crc ^= bytes[i];

		for (j = 0; j < 8; j++)
			crc = (crc >> 1) ^ (CRC32_MAGIC & (~(crc & 1) + 1));
	}

	return crc;
}

static void
seekOrThrowInvalidFormat(OFSeekableStream *stream,
    of_offset_t offset, int whence)
{
	@try {
		[stream seekToOffset: offset
			      whence: whence];
	} @catch (OFSeekFailedException *e) {
		if ([e errNo] == EINVAL)
			@throw [OFInvalidFormatException exception];

		@throw e;
	}
}

@implementation OFZIPArchive
+ (instancetype)archiveWithSeekableStream: (OFSeekableStream*)stream
{
	return [[[self alloc] initWithSeekableStream: stream] autorelease];
}
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{
	void *pool = objc_autoreleasePoolPush();
	uint16_t commentLength;
	of_offset_t offset = -22;
	bool valid = false;

	do {
		@try {
			[_stream seekToOffset: offset
				       whence: SEEK_END];
		} @catch (OFSeekFailedException *e) {
			if ([e errNo] == EINVAL)
				@throw [OFInvalidFormatException exception];

			@throw e;
		}

		if ([_stream readLittleEndianInt32] == 0x06054B50) {
			valid = true;
			break;
		}
	} while (--offset >= -65557);









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{
	void *pool = objc_autoreleasePoolPush();
	uint16_t commentLength;
	of_offset_t offset = -22;
	bool valid = false;

	do {






		seekOrThrowInvalidFormat(_stream, offset, SEEK_END);



		if ([_stream readLittleEndianInt32] == 0x06054B50) {
			valid = true;
			break;
		}
	} while (--offset >= -65557);
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	    _centralDirectoryDisk == 0xFFFF ||
	    _centralDirectoryEntriesInDisk == 0xFFFF ||
	    _centralDirectoryEntries == 0xFFFF ||
	    _centralDirectorySize == 0xFFFFFFFF ||
	    _centralDirectoryOffset == 0xFFFFFFFF) {
		uint64_t offset64, size;

		[_stream seekToOffset: offset - 20
			       whence: SEEK_END];

		if ([_stream readLittleEndianInt32] != 0x07064B50) {
			objc_autoreleasePoolPop(pool);
			return;
		}

		/*
		 * FIXME: Handle number of the disk containing ZIP64 end of
		 * central directory record.
		 */
		[_stream readLittleEndianInt32];
		offset64 = [_stream readLittleEndianInt64];

		if ((of_offset_t)offset64 != offset64)
			@throw [OFOutOfRangeException exception];


		[_stream seekToOffset: (of_offset_t)offset64
			       whence: SEEK_SET];

		if ([_stream readLittleEndianInt32] != 0x06064B50)
			@throw [OFInvalidFormatException exception];

		size = [_stream readLittleEndianInt64];
		if (size < 44)
			@throw [OFInvalidFormatException exception];








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	    _centralDirectoryDisk == 0xFFFF ||
	    _centralDirectoryEntriesInDisk == 0xFFFF ||
	    _centralDirectoryEntries == 0xFFFF ||
	    _centralDirectorySize == 0xFFFFFFFF ||
	    _centralDirectoryOffset == 0xFFFFFFFF) {
		uint64_t offset64, size;

		seekOrThrowInvalidFormat(_stream, offset - 20, SEEK_END);


		if ([_stream readLittleEndianInt32] != 0x07064B50) {
			objc_autoreleasePoolPop(pool);
			return;
		}

		/*
		 * FIXME: Handle number of the disk containing ZIP64 end of
		 * central directory record.
		 */
		[_stream readLittleEndianInt32];
		offset64 = [_stream readLittleEndianInt64];

		if ((of_offset_t)offset64 != offset64)
			@throw [OFOutOfRangeException exception];

		seekOrThrowInvalidFormat(_stream,
		    (of_offset_t)offset64, SEEK_SET);


		if ([_stream readLittleEndianInt32] != 0x06064B50)
			@throw [OFInvalidFormatException exception];

		size = [_stream readLittleEndianInt64];
		if (size < 44)
			@throw [OFInvalidFormatException exception];
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{
	void *pool = objc_autoreleasePoolPush();
	size_t i;

	if ((of_offset_t)_centralDirectoryOffset != _centralDirectoryOffset)
		@throw [OFOutOfRangeException exception];


	[_stream seekToOffset: (of_offset_t)_centralDirectoryOffset
		       whence: SEEK_SET];

	_entries = [[OFMutableArray alloc] init];
	_pathToEntryMap = [[OFMutableDictionary alloc] init];

	for (i = 0; i < _centralDirectoryEntries; i++) {
		OFZIPArchiveEntry *entry = [[[OFZIPArchiveEntry alloc]
		    OF_initWithStream: _stream] autorelease];








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{
	void *pool = objc_autoreleasePoolPush();
	size_t i;

	if ((of_offset_t)_centralDirectoryOffset != _centralDirectoryOffset)
		@throw [OFOutOfRangeException exception];

	seekOrThrowInvalidFormat(_stream,
	    (of_offset_t)_centralDirectoryOffset, SEEK_SET);


	_entries = [[OFMutableArray alloc] init];
	_pathToEntryMap = [[OFMutableDictionary alloc] init];

	for (i = 0; i < _centralDirectoryEntries; i++) {
		OFZIPArchiveEntry *entry = [[[OFZIPArchiveEntry alloc]
		    OF_initWithStream: _stream] autorelease];
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	[_lastReturnedStream release];
	_lastReturnedStream = nil;

	offset64 = [entry OF_localFileHeaderOffset];
	if ((of_offset_t)offset64 != offset64)
		@throw [OFOutOfRangeException exception];

	[_stream seekToOffset: (of_offset_t)offset64
		       whence: SEEK_SET];
	localFileHeader = [[[OFZIPArchive_LocalFileHeader alloc]
	    initWithStream: _stream] autorelease];

	if (![localFileHeader matchesEntry: entry])
		@throw [OFInvalidFormatException exception];

	if ((localFileHeader->_minVersionNeeded & 0xFF) > 45) {








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	[_lastReturnedStream release];
	_lastReturnedStream = nil;

	offset64 = [entry OF_localFileHeaderOffset];
	if ((of_offset_t)offset64 != offset64)
		@throw [OFOutOfRangeException exception];

	seekOrThrowInvalidFormat(_stream, (of_offset_t)offset64, SEEK_SET);

	localFileHeader = [[[OFZIPArchive_LocalFileHeader alloc]
	    initWithStream: _stream] autorelease];

	if (![localFileHeader matchesEntry: entry])
		@throw [OFInvalidFormatException exception];

	if ((localFileHeader->_minVersionNeeded & 0xFF) > 45) {
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		min = (length < _size ? length : (size_t)_size);
		ret = [_decompressedStream readIntoBuffer: buffer
						   length: min];
		_size -= ret;
	}

	_CRC32 = crc32(_CRC32, buffer, ret);

	return ret;
}

- (void)close
{
	_closed = true;
}
@end








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		min = (length < _size ? length : (size_t)_size);
		ret = [_decompressedStream readIntoBuffer: buffer
						   length: min];
		_size -= ret;
	}

	_CRC32 = calculateCRC32(_CRC32, buffer, ret);

	return ret;
}

- (void)close
{
	_closed = true;
}
@end

Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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