ObjFW  Check-in [b431203426]

{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	@try {
		[_lastReturnedStream close];
	} @catch (OFNotOpenException *e) {
		/* Might have already been closed by the user - that's fine. */
	}

	/* LHA archives should be terminated with a header of size 0 */
	if (_hasWritten)
		[_stream writeBuffer: "" length: 1];

	_lastReturnedStream = nil;

- (instancetype)initWithFileName: (OFString *)fileName
{
	self = [super of_init];

	@try {
		void *pool = objc_autoreleasePoolPush();

		self.fileName = fileName;
		self.modificationDate = [OFDate date];

		objc_autoreleasePoolPop(pool);
	} @catch (id e) {
		[self release];
		@throw e;
	}

	OFString *old = _fileComment;
	_fileComment = [fileComment copy];
	[old release];
}

- (void)setFileName: (OFString *)fileName
{
	void *pool = objc_autoreleasePoolPush();
	OFString *oldFileName = _fileName, *oldDirectoryName = _directoryName;
	size_t lastSlash;

	lastSlash = [fileName rangeOfString: @"/"
				    options: OFStringSearchBackwards].location;
	if (lastSlash != OFNotFound) {
		_fileName = [[fileName substringWithRange: OFMakeRange(
		    lastSlash + 1, fileName.length - lastSlash - 1)] copy];
		[oldFileName release];

		_directoryName = [[fileName substringWithRange:
		    OFMakeRange(0, lastSlash)] copy];
		[oldDirectoryName release];
	} else {
		_fileName = [fileName copy];
		[oldFileName release];

		[_directoryName release];
		_directoryName = nil;
	}

	objc_autoreleasePoolPop(pool);
}

- (void)setOperatingSystemIdentifier: (uint16_t)operatingSystemIdentifier
{
	_operatingSystemIdentifier = operatingSystemIdentifier;
}

 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#import "OFObject.h"
#import "OFSeekableStream.h"
#import "OFString.h"
#import "OFZooArchiveEntry.h"

OF_ASSUME_NONNULL_BEGIN



/**
 * @class OFZooArchive OFZooArchive.h ObjFW/OFZooArchive.h
 *
 * @brief A class for accessing and manipulating Zoo files.
 */
OF_SUBCLASSING_RESTRICTED
@interface OFZooArchive: OFObject
{
	OF_KINDOF(OFStream *) _stream;
	uint_least8_t _mode;
	OFStringEncoding _encoding;
	uint16_t _minVersionNeeded;
	uint8_t _headerType;
	OFZooArchiveEntry *_Nullable _currentEntry;
#ifdef OF_ZOO_ARCHIVE_M
@public
#endif
	OFStream *_Nullable _lastReturnedStream;
@protected
	OFStreamOffset _lastHeaderOffset;
	size_t _lastHeaderLength;
}

/**
 * @brief The encoding to use for the archive. Defaults to UTF-8.
 */
@property (nonatomic) OFStringEncoding encoding;

/**
 * @brief Creates a new OFZooArchive object with the specified stream.
 *
 * @param stream A stream from which the Zoo archive will be read.
 *		 For read mode, this needs to be an OFSeekableStream.
 * @param mode The mode for the Zoo file. Valid modes are "r" for reading and
 *	       "w" for creating a new file.
 * @return A new, autoreleased OFZooArchive
 */
+ (instancetype)archiveWithStream: (OFStream *)stream mode: (OFString *)mode;

/**
 * @brief Creates a new OFZooArchive object with the specified file.
 *
 * @param IRI The IRI to the Zoo file
 * @param mode The mode for the Zoo file. Valid modes are "r" for reading and
 *	       "w" for creating a new file.
 * @return A new, autoreleased OFZooArchive
 */
+ (instancetype)archiveWithIRI: (OFIRI *)IRI mode: (OFString *)mode;

- (instancetype)init OF_UNAVAILABLE;

/**
 * @brief Initializes an already allocated OFZooArchive object with the
 *	  specified stream.
 *
 * @param stream A stream from which the Zoo archive will be read.
 *		 For read mode, this needs to be an OFSeekableStream.
 * @param mode The mode for the Zoo file. Valid modes are "r" for reading and
 *	       "w" for creating a new file.
 * @return An initialized OFZooArchive
 */
- (instancetype)initWithStream: (OFStream *)stream
			  mode: (OFString *)mode OF_DESIGNATED_INITIALIZER;

/**
 * @brief Initializes an already allocated OFZooArchive object with the
 *	  specified file.
 *
 * @param IRI The IRI to the Zoo file
 * @param mode The mode for the Zoo file. Valid modes is "r" for reading and
 *	       "w" for creating a new file.
 * @return An initialized OFZooArchive
 */
- (instancetype)initWithIRI: (OFIRI *)IRI mode: (OFString *)mode;

/**
 * @brief Returns the next entry from the Zoo archive or `nil` if all entries
 *	  have been read.
 *
 * @note This is only available in read mode.
 *
 * @warning Calling @ref nextEntry will invalidate all streams returned by
 *	    @ref streamForReadingCurrentEntry or
 *	    @ref streamForWritingEntry:! Reading from or writing to an
 *	    invalidated stream will throw an @ref OFReadFailedException or
 *	    @ref OFWriteFailedException!
 *
 * @return The next entry from the Zoo archive or `nil` if all entries have
 *	   been read
 * @throw OFInvalidFormatException The archive's format is invalid
 * @throw OFUnsupportedVersionException The archive's format is of an
 *					unsupported version
 * @throw OFTruncatedDataException The archive was truncated
 */
- (nullable OFZooArchiveEntry *)nextEntry;

/**
 * @brief Returns a stream for reading the current entry.
 *
 * @note This is only available in read mode.
 *
 * @note The returned stream conforms to @ref OFReadyForReadingObserving if the
 *	 underlying stream does so, too.
 *
 * @return A stream for reading the current entry
 * @throw OFSeekFailedException Seeking to the data in the archive failed
 */
- (OFStream *)streamForReadingCurrentEntry;

/**
 * @brief Returns a stream for writing the specified entry.
 *
 * @note This is only available in write and append mode.
 *
 * @note The returned stream conforms to @ref OFReadyForWritingObserving if the
 *	 underlying stream does so, too.
 *
 * @warning Calling @ref streamForWritingEntry: will invalidate all streams
 *	    returned by @ref streamForReadingCurrentEntry or
 *	    @ref streamForWritingEntry:! Reading from or writing to an
 *	    invalidated stream will throw an @ref OFReadFailedException or
 *	    @ref OFWriteFailedException!
 *
 * @param entry The entry for which a stream for writing should be returned.@n
 *	        The following parts of the specified entry will be ignored:
 *	          * The header type.
 *	          * The minimum version needed.
 *	          * The compressed size.
 *	          * The uncompressed size.
 *	          * The CRC16.
 * @return A stream for writing the specified entry
 */
- (OFStream *)streamForWritingEntry: (OFZooArchiveEntry *)entry;

/**
 * @brief Closes the OFZooArchive.
 *
 * @throw OFNotOpenException The archive is not open
 */
- (void)close;
@end

OF_ASSUME_NONNULL_END

 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#define OF_ZOO_ARCHIVE_M

#include "config.h"

#include <errno.h>

#import "OFZooArchive.h"
#import "OFZooArchiveEntry.h"
#import "OFZooArchiveEntry+Private.h"
#import "OFCRC16.h"
#import "OFIRI.h"
#import "OFIRIHandler.h"
#import "OFKernelEventObserver.h"
#import "OFLHADecompressingStream.h"
#import "OFSeekableStream.h"
#import "OFStream.h"
#import "OFString.h"

#import "OFChecksumMismatchException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFNotOpenException.h"
#import "OFOutOfRangeException.h"
#import "OFTruncatedDataException.h"
#import "OFUnsupportedVersionException.h"
#import "OFWriteFailedException.h"

enum {
	modeRead,
	modeWrite
};

OF_DIRECT_MEMBERS
@interface OFZooArchive ()
- (void)of_readArchiveHeader;
@end

	bool _atEndOfStream;
}

- (instancetype)of_initWithArchive: (OFZooArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFZooArchiveEntry *)entry;
@end

OF_DIRECT_MEMBERS
@interface OFZooArchiveFileWriteStream: OFStream <OFReadyForWritingObserving>
{
	OFZooArchive *_archive;
	OFMutableZooArchiveEntry *_entry;
	OFStringEncoding _encoding;
	OFSeekableStream *_stream;
	OFStreamOffset *_lastHeaderOffset;
	size_t *_lastHeaderLength;
	uint32_t _bytesWritten;
	uint16_t _CRC16;
}

- (instancetype)of_initWithArchive: (OFZooArchive *)archive
			    stream: (OFSeekableStream *)stream
			     entry: (OFZooArchiveEntry *)entry
			  encoding: (OFStringEncoding)encoding
		  lastHeaderOffset: (OFStreamOffset *)lastHeaderOffset
		  lastHeaderLength: (size_t *)lastHeaderLength;
@end

@implementation OFZooArchive
@synthesize encoding = _encoding;

+ (instancetype)archiveWithStream: (OFStream *)stream mode: (OFString *)mode
{
	return [[[self alloc] initWithStream: stream mode: mode] autorelease];

- (instancetype)initWithStream: (OFStream *)stream mode: (OFString *)mode
{
	self = [super init];

	@try {
		if ([mode isEqual: @"r"])
			_mode = modeRead;
		else if ([mode isEqual: @"w"])
			_mode = modeWrite;
		else if ([mode isEqual: @"a"])
			@throw [OFNotImplementedException
			    exceptionWithSelector: _cmd
					   object: nil];
		else
			@throw [OFInvalidArgumentException exception];

		if (![stream isKindOfClass: [OFSeekableStream class]])
			@throw [OFInvalidArgumentException exception];

		_stream = [stream retain];
		_encoding = OFStringEncodingUTF8;

		if (_mode == modeRead)



			[self of_readArchiveHeader];

	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (instancetype)initWithIRI: (OFIRI *)IRI mode: (OFString *)mode
{
	void *pool = objc_autoreleasePoolPush();
	OFStream *stream;

	@try {
		if ([mode isEqual: @"w"])
			stream = [OFIRIHandler openItemAtIRI: IRI mode: @"w+"];
		else
			stream = [OFIRIHandler openItemAtIRI: IRI mode: mode];
	} @catch (id e) {
		[self release];
		@throw e;
	}

		@throw [OFInvalidFormatException exception];

	firstFileOffset = [_stream readLittleEndianInt32];

	if ([_stream readLittleEndianInt32] != ~(uint32_t)(firstFileOffset - 1))
		@throw [OFInvalidFormatException exception];

	if ((_minVersionNeeded = [_stream readBigEndianInt16]) > 0x201)
		@throw [OFUnsupportedVersionException exceptionWithVersion:
		    [OFString stringWithFormat: @"%" PRIu8 @".%" PRIu8,
						_minVersionNeeded >> 8,
						_minVersionNeeded & 0xFF]];

	if ((_headerType = [_stream readInt8]) > 1)
		@throw [OFUnsupportedVersionException exceptionWithVersion:
		    [OFString stringWithFormat: @"%" PRIu8, _headerType]];

	[_stream seekToOffset: firstFileOffset whence: OFSeekSet];
}

- (OFZooArchiveEntry *)nextEntry
{
	if (_mode != modeRead)

	_lastReturnedStream = [[[OFZooArchiveFileReadStream alloc]
	    of_initWithArchive: self
			stream: _stream
			 entry: _currentEntry] autorelease];

	return _lastReturnedStream;
}

- (void)of_fixUpLastHeader
{
	OFStreamOffset offset;
	unsigned char *buffer;

	if (_lastHeaderOffset == 0)
		return;

	offset = [_stream seekToOffset: 0 whence: OFSeekCurrent];

	if (offset < 0 || offset > UINT32_MAX || _lastHeaderLength < 56)
		@throw [OFOutOfRangeException exception];

	[_stream seekToOffset: _lastHeaderOffset whence: OFSeekSet];
	buffer = OFAllocMemory(1, _lastHeaderLength);
	@try {
		uint16_t tmp16;
		uint32_t tmp32;

		[_stream readIntoBuffer: buffer exactLength: _lastHeaderLength];

		tmp32 = OFToLittleEndian32((uint32_t)offset);
		memcpy(buffer + 6, &tmp32, 4);

		tmp16 = OFToLittleEndian16(
		    OFCRC16(0, buffer, _lastHeaderLength));
		memcpy(buffer + 54, &tmp16, 2);

		[_stream seekToOffset: _lastHeaderOffset whence: OFSeekSet];
		[_stream writeBuffer: buffer length: _lastHeaderLength];

		[_stream seekToOffset: offset whence: OFSeekSet];
	} @finally {
		OFFreeMemory(buffer);
	}
}

- (OFStream *)streamForWritingEntry: (OFZooArchiveEntry *)entry
{
	if (_mode != modeWrite)
		@throw [OFInvalidArgumentException exception];

	if (entry.compressionMethod != 0)
		@throw [OFNotImplementedException exceptionWithSelector: _cmd
								 object: self];

	if (_lastHeaderOffset == 0) {
		/* First file - write header. */
		[_stream writeBuffer: "ObjFW Zoo Archive.\x1F" length: 20];
		[_stream writeLittleEndianInt32: 0xFDC4A7DC];
		[_stream writeLittleEndianInt32: 42];
		[_stream writeLittleEndianInt32: -42];
		/* TODO: Increase to 0x201 once we add compressed files. */
		[_stream writeBigEndianInt16: 0x200];
		/* Header type */
		[_stream writeInt8: 1];
		/* Archive comment offset */
		[_stream writeLittleEndianInt32: 0];
		/* Archive comment length */
		[_stream writeLittleEndianInt16: 0];
		/* Version flag */
		[_stream writeInt8: 0];
	} else
		[self of_fixUpLastHeader];

	@try {
		[_lastReturnedStream close];
	} @catch (OFNotOpenException *e) {
		/* Might have already been closed by the user - that's fine. */
	}
	_lastReturnedStream = nil;

	_lastReturnedStream = [[[OFZooArchiveFileWriteStream alloc]
	    of_initWithArchive: self
			stream: _stream
			 entry: entry
		      encoding: _encoding
	      lastHeaderOffset: &_lastHeaderOffset
	      lastHeaderLength: &_lastHeaderLength] autorelease];

	return  _lastReturnedStream;
}

- (void)close
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	@try {
		[_lastReturnedStream close];
	} @catch (OFNotOpenException *e) {
		/* Might have already been closed by the user - that's fine. */
	}
	_lastReturnedStream = nil;

	/*
	 * Zoo archives should be terminated with an entry that has a next
	 * header offset of 0.
	 */
	if (_mode == modeWrite) {
		static const unsigned char header[56] = {
			0xDC, 0xA7, 0xC4, 0xFD, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0xFC, 0x83
		};

		[self of_fixUpLastHeader];

		[_stream writeBuffer: header length: sizeof(header)];
	}

	[_stream release];
	_stream = nil;
}
@end

@implementation OFZooArchiveFileReadStream

		@throw [OFNotOpenException exceptionWithObject: self];

	[_stream release];
	_stream = nil;

	[_decompressedStream release];
	_decompressedStream = nil;

	[super close];
}
@end

@implementation OFZooArchiveFileWriteStream
- (instancetype)of_initWithArchive: (OFZooArchive *)archive
			    stream: (OFSeekableStream *)stream
			     entry: (OFZooArchiveEntry *)entry
			  encoding: (OFStringEncoding)encoding
		  lastHeaderOffset: (OFStreamOffset *)lastHeaderOffset
		  lastHeaderLength: (size_t *)lastHeaderLength
{
	self = [super init];

	@try {
		_archive = [archive retain];
		_entry = [entry mutableCopy];
		_encoding = encoding;
		_lastHeaderOffset = lastHeaderOffset;
		_lastHeaderLength = lastHeaderLength;

		*_lastHeaderOffset = [stream seekToOffset: 0
						   whence: OFSeekCurrent];
		*_lastHeaderLength = [_entry of_writeToStream: stream
						     encoding: _encoding];

		/*
		 * Retain stream last, so that -[close] called by -[dealloc]
		 * doesn't write in case of error.
		 */
		_stream = [stream retain];
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	if (_stream != nil)
		[self close];

	[_entry release];

	if (_archive->_lastReturnedStream == self)
		_archive->_lastReturnedStream = nil;

	[_archive release];

	[super dealloc];
}

- (size_t)lowlevelWriteBuffer: (const void *)buffer length: (size_t)length
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	if (UINT32_MAX - _bytesWritten < length)
		@throw [OFOutOfRangeException exception];

	@try {
		[_stream writeBuffer: buffer length: length];
	} @catch (OFWriteFailedException *e) {
		OFEnsure(e.bytesWritten <= length);

		_bytesWritten += (uint32_t)e.bytesWritten;
		_CRC16 = OFCRC16(_CRC16, buffer, e.bytesWritten);

		if (e.errNo == EWOULDBLOCK || e.errNo == EAGAIN)
			return e.bytesWritten;

		@throw e;
	}

	_bytesWritten += (uint32_t)length;
	_CRC16 = OFCRC16(_CRC16, buffer, length);

	return length;
}

- (bool)lowlevelIsAtEndOfStream
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	return _stream.atEndOfStream;
}

- (int)fileDescriptorForWriting
{
	return ((id <OFReadyForWritingObserving>)_stream)
	    .fileDescriptorForWriting;
}

- (void)close
{
	OFStreamOffset offset;

	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	_entry.uncompressedSize = _bytesWritten;
	_entry.compressedSize = _bytesWritten;
	_entry.CRC16 = _CRC16;

	offset = [_stream seekToOffset: 0 whence: OFSeekCurrent];

	if (offset > UINT32_MAX)
		@throw [OFOutOfRangeException exception];

	[_stream seekToOffset: *_lastHeaderOffset whence: OFSeekSet];
	_entry->_dataOffset = (uint32_t)offset;

	OFEnsure([_entry of_writeToStream: _stream
				 encoding: _encoding] == *_lastHeaderLength);
	[_stream seekToOffset: offset whence: OFSeekSet];

	[_stream release];
	_stream = nil;

	[super close];
}
@end

 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#import "OFZooArchive.h"
#import "OFSeekableStream.h"

OF_ASSUME_NONNULL_BEGIN

@interface OFZooArchiveEntry ()
- (instancetype)of_init OF_METHOD_FAMILY(init);
- (nullable instancetype)of_initWithStream: (OFSeekableStream *)stream
				  encoding: (OFStringEncoding)encoding
    OF_METHOD_FAMILY(init) OF_DIRECT;
- (size_t)of_writeToStream: (OFSeekableStream *)stream
		  encoding: (OFStringEncoding)encoding;
@end

OF_ASSUME_NONNULL_END

 * file.
 */

#include "config.h"

#import "OFZooArchiveEntry.h"
#import "OFZooArchiveEntry+Private.h"
#import "OFData.h"
#import "OFDate.h"
#import "OFNumber.h"
#import "OFSeekableStream.h"

#import "OFString.h"

#import "OFInvalidFormatException.h"
#import "OFOutOfRangeException.h"
#import "OFUnsupportedVersionException.h"

@implementation OFZooArchiveEntry
- (instancetype)init
{
	OF_INVALID_INIT_METHOD
}

		[self release];
		@throw e;
	}

	return self;
}

- (instancetype)of_initWithStream: (OFSeekableStream *)stream
			 encoding: (OFStringEncoding)encoding
{
	self = [super init];

	@try {
		void *pool = objc_autoreleasePoolPush();
		char fileNameBuffer[13];
		uint32_t commentOffset;
		uint16_t commentLength;

		if ([stream readLittleEndianInt32] != 0xFDC4A7DC)
			@throw [OFInvalidFormatException exception];

		if ((_headerType = [stream readInt8]) > 2)
			@throw [OFUnsupportedVersionException
			    exceptionWithVersion: [OFString
			    stringWithFormat: @"%" PRIu8, _headerType]];

		_compressionMethod = [stream readInt8];
		_nextHeaderOffset = [stream readLittleEndianInt32];

		if (_nextHeaderOffset == 0) {
			[self release];
			return nil;
		}

		_dataOffset = [stream readLittleEndianInt32];
		_lastModifiedFileDate = [stream readLittleEndianInt16];
		_lastModifiedFileTime = [stream readLittleEndianInt16];
		_CRC16 = [stream readLittleEndianInt16];
		_uncompressedSize = [stream readLittleEndianInt32];
		_compressedSize = [stream readLittleEndianInt32];

		if ((_minVersionNeeded = [stream readBigEndianInt16]) > 0x201)
			@throw [OFUnsupportedVersionException
			    exceptionWithVersion: [OFString stringWithFormat:
			    @"%" PRIu8 @".%" PRIu8,
			    _minVersionNeeded >> 8, _minVersionNeeded & 0xFF]];

		_deleted = [stream readInt8];
		/*
		 * File structure, whatever that is meant to be. Seems to
		 * always be 0.
		 */
		[stream readInt8];
		commentOffset = [stream readLittleEndianInt32];
		commentLength = [stream readLittleEndianInt16];

		[stream readIntoBuffer: fileNameBuffer exactLength: 13];
		if (fileNameBuffer[12] != '\0')
			fileNameBuffer[12] = '\0';

		if (_headerType >= 2) {
			uint16_t extraLength = [stream readLittleEndianInt16];
			uint8_t fileNameLength = 0, directoryNameLength = 0;




			_timeZone = [stream readInt8];
			/* CRC16 of the header */
			[stream readLittleEndianInt16];

			if (extraLength >= 2) {
				fileNameLength = [stream readInt8];
				directoryNameLength = [stream readInt8];
				extraLength -= 2;
			}

			if (fileNameLength > 0) {
				if (extraLength < fileNameLength)
					@throw [OFInvalidFormatException
					    exception];

				_fileName = [[stream

{
	return [self retain];
}

- (id)mutableCopy
{
	OFZooArchiveEntry *copy = [[OFMutableZooArchiveEntry alloc]
	    initWithFileName: self.fileName];

	@try {
		copy->_headerType = _headerType;
		copy->_compressionMethod = _compressionMethod;
		copy->_nextHeaderOffset = _nextHeaderOffset;
		copy->_dataOffset = _dataOffset;
		copy->_lastModifiedFileDate = _lastModifiedFileDate;
		copy->_lastModifiedFileTime = _lastModifiedFileTime;
		copy->_CRC16 = _CRC16;
		copy->_uncompressedSize = _uncompressedSize;
		copy->_compressedSize = _compressedSize;
		copy->_minVersionNeeded = _minVersionNeeded;
		copy->_deleted = _deleted;
		copy->_fileComment = [_fileComment copy];

		copy->_operatingSystemIdentifier = _operatingSystemIdentifier;
		copy->_POSIXPermissions = [_POSIXPermissions retain];
		copy->_timeZone = _timeZone;
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return copy;
}

- (uint8_t)headerType
{
	return _headerType;
}

- (OFNumber *)timeZone
{
	if (_timeZone == 0x7F)
		return nil;

	return [OFNumber numberWithFloat: -(float)_timeZone / 4];
}

- (size_t)of_writeToStream: (OFSeekableStream *)stream
		  encoding: (OFStringEncoding)encoding
{
	void *pool = objc_autoreleasePoolPush();
	OFMutableData *data = [OFMutableData dataWithCapacity: 56];
	OFStreamOffset offset = [stream seekToOffset: 0 whence: OFSeekCurrent];
	size_t dataOffsetIndex, commentOffsetIndex;
	char fileNameBuffer[13] = { 0 };
	uint8_t tmp8;
	uint16_t tmp16;
	uint32_t tmp32;
	size_t commentLength, fileNameLength, directoryNameLength, length;

	if (_uncompressedSize > UINT32_MAX || _compressedSize > UINT32_MAX)
		@throw [OFOutOfRangeException exception];

	commentLength = [_fileComment cStringLengthWithEncoding: encoding];
	if (commentLength > UINT16_MAX)
		@throw [OFOutOfRangeException exception];

	fileNameLength = [_fileName cStringLengthWithEncoding: encoding];
	if (fileNameLength > UINT8_MAX)
		@throw [OFOutOfRangeException exception];

	directoryNameLength =
	    [_directoryName cStringLengthWithEncoding: encoding];
	if (directoryNameLength > UINT8_MAX)
		@throw [OFOutOfRangeException exception];

	[data addItems: "\xDC\xA7\xC4\xFD" count: 4];
	/* Header type */
	[data addItem: "\x02"];
	[data addItem: &_compressionMethod];

	/* Next header offset filled when writing the next header */
	[data increaseCountBy: 4];
	/* Data offset is filled after generating the header */
	dataOffsetIndex = data.count;
	[data increaseCountBy: 4];

	tmp16 = OFToLittleEndian16(_lastModifiedFileDate);
	[data addItems: &tmp16 count: 2];
	tmp16 = OFToLittleEndian16(_lastModifiedFileTime);
	[data addItems: &tmp16 count: 2];
	tmp16 = OFToLittleEndian16(_CRC16);
	[data addItems: &tmp16 count: 2];

	tmp32 = OFToLittleEndian32((uint32_t)_uncompressedSize);
	[data addItems: &tmp32 count: 4];
	tmp32 = OFToLittleEndian32((uint32_t)_compressedSize);
	[data addItems: &tmp32 count: 4];

	/* Min version needed */
	/* TODO: Increase to 2.1 once we add compression. */
	[data addItems: "\x02\x00" count: 2];

	[data addItem: (_deleted ? "\x01" : "")];

	/*
	 * File structure, whatever that is meant to be.
	 * Seems to always be 0.
	 */
	[data addItem: ""];

	/* Comment offset is filled after generating the header */
	commentOffsetIndex = data.count;
	[data increaseCountBy: 4];
	tmp16 = OFToLittleEndian16((uint16_t)commentLength);
	[data addItems: &tmp16 count: 2];

	strncpy(fileNameBuffer, [_fileName cStringWithEncoding: encoding], 12);
	[data addItems: fileNameBuffer count: 13];

	/* Variable length. */
	tmp16 = OFToLittleEndian16(fileNameLength + directoryNameLength + 4 +
	    (_POSIXPermissions != nil ? 3 : 0));
	[data addItems: &tmp16 count: 2];

	[data addItem: &_timeZone];

	/*
	 * CRC16 is filled when writing the next header, as the CRC needs to
	 * include the next header offset.
	 */
	[data increaseCountBy: 2];

	tmp8 = (uint8_t)fileNameLength;
	[data addItem: &tmp8];
	tmp8 = (uint8_t)directoryNameLength;
	[data addItem: &tmp8];

	[data addItems: [_fileName cStringWithEncoding: encoding]
		 count: fileNameLength];
	[data addItems: [_directoryName cStringWithEncoding: encoding]
		 count: directoryNameLength];

	tmp16 = OFToLittleEndian16((uint16_t)_operatingSystemIdentifier);
	[data addItems: &tmp16 count: 2];

	if (_POSIXPermissions != nil) {
		unsigned short mode = _POSIXPermissions.unsignedShortValue;
		uint8_t attributes[3];

		attributes[0] = mode & 0xFF;
		attributes[1] = mode >> 8;
		attributes[2] = (1 << 6);

		[data addItems: attributes count: sizeof(attributes)];
	}

	/* Now that we have the entire header, we know where the data starts. */
	if (SIZE_MAX - data.count < commentLength)
		@throw [OFOutOfRangeException exception];

	if (offset < 0 || UINT32_MAX - (unsigned long long)offset <
	    data.count + commentLength)
		@throw [OFOutOfRangeException exception];

	tmp32 = OFToLittleEndian32(
	    (uint32_t)offset + (uint32_t)data.count + (uint32_t)commentLength);
	memcpy([data mutableItemAtIndex: dataOffsetIndex], &tmp32, 4);

	tmp32 = OFToLittleEndian32((uint32_t)offset + (uint32_t)data.count);
	memcpy([data mutableItemAtIndex: commentOffsetIndex], &tmp32, 4);

	[stream writeData: data];
	length = data.count;

	if (commentLength > 0)
		[stream writeString: _fileComment encoding: encoding];

	objc_autoreleasePoolPop(pool);

	return length;
}

- (OFString *)description
{
	void *pool = objc_autoreleasePoolPush();
	OFString *ret = [OFString stringWithFormat:
	    @"<%@:\n"
	    @"\tFile name = %@\n"