ObjFW  Artifact [9d548c4f33]

Artifact 9d548c4f336d9d49d9bf431fcadbd571251b3f1a33db29b61da4413282c97672:

• File src/OFZIPArchive.m — part of check-in [6527c97d03] at 2022-10-09 16:19:17 on branch trunk — OFZIPArchive: Make returned streams retain archive

  In order to not create a retain cycle, this changes the reference to the
  last returned stream to an unsafe unretained one that the stream itself
  needs to reset to nil in its dealloc.

  Since when closing a stream for writing the archive needs to be updated,
  the code for that was moved out of OFZIPArchive and into the stream
  writer, since it now has a reference to the archive anyway. (user: js, size: 24622) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * 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.
 */

#define OF_ZIP_ARCHIVE_M

#include "config.h"

#include <errno.h>

#import "OFZIPArchive.h"
#import "OFZIPArchiveEntry.h"
#import "OFZIPArchiveEntry+Private.h"
#import "OFArchiveURIHandler.h"
#import "OFArray.h"
#import "OFCRC32.h"
#import "OFData.h"
#import "OFDictionary.h"
#import "OFInflate64Stream.h"
#import "OFInflateStream.h"
#import "OFSeekableStream.h"
#import "OFStream.h"
#import "OFURI.h"
#import "OFURIHandler.h"

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

/*
 * FIXME: Current limitations:
 *  - Split archives are not supported.
 *  - Encrypted files cannot be read.
 */

enum {
	modeRead,
	modeWrite,
	modeAppend
};

OF_DIRECT_MEMBERS
@interface OFZIPArchive ()
- (void)of_readZIPInfo;
- (void)of_readEntries;
- (void)of_writeCentralDirectory;
@end

OF_DIRECT_MEMBERS
@interface OFZIPArchiveLocalFileHeader: OFObject
{
@public
	uint16_t _minVersionNeeded, _generalPurposeBitFlag, _compressionMethod;
	uint16_t _lastModifiedFileTime, _lastModifiedFileDate;
	uint32_t _CRC32;
	uint64_t _compressedSize, _uncompressedSize;
	OFString *_fileName;
	OFData *_extraField;
}

- (instancetype)initWithStream: (OFStream *)stream;
- (bool)matchesEntry: (OFZIPArchiveEntry *)entry;
@end

OF_DIRECT_MEMBERS
@interface OFZIPArchiveFileReadStream: OFStream
{
	OFZIPArchive *_archive;
	OFStream *_stream, *_decompressedStream;
	OFZIPArchiveEntry *_entry;
	unsigned long long _toRead;
	uint32_t _CRC32;
	bool _atEndOfStream;
}

- (instancetype)of_initWithArchive: (OFZIPArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFZIPArchiveEntry *)entry;
@end

OF_DIRECT_MEMBERS
@interface OFZIPArchiveFileWriteStream: OFStream
{
	OFZIPArchive *_archive;
	OFStream *_stream;
	uint32_t _CRC32;
@public
	unsigned long long _bytesWritten;
	OFMutableZIPArchiveEntry *_entry;
}

- (instancetype)of_initWithArchive: (OFZIPArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFMutableZIPArchiveEntry *)entry;
@end

uint32_t
OFZIPArchiveReadField32(const uint8_t **data, uint16_t *size)
{
	uint32_t field = 0;

	if (*size < 4)
		@throw [OFInvalidFormatException exception];

	for (uint8_t i = 0; i < 4; i++)
		field |= (uint32_t)(*data)[i] << (i * 8);

	*data += 4;
	*size -= 4;

	return field;
}

uint64_t
OFZIPArchiveReadField64(const uint8_t **data, uint16_t *size)
{
	uint64_t field = 0;

	if (*size < 8)
		@throw [OFInvalidFormatException exception];

	for (uint8_t i = 0; i < 8; i++)
		field |= (uint64_t)(*data)[i] << (i * 8);

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

	return field;
}

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

		@throw e;
	}
}

@implementation OFZIPArchive
@synthesize archiveComment = _archiveComment;

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

+ (instancetype)archiveWithURI: (OFURI *)URI mode: (OFString *)mode
{
	return [[[self alloc] initWithURI: URI mode: mode] autorelease];
}

+ (OFURI *)URIForFile: (OFString *)path inArchive: (OFURI *)archive
{
	return OFArchiveURIHandlerURIForFileInArchive(@"of-zip", path, archive);
}

- (instancetype)init
{
	OF_INVALID_INIT_METHOD
}

- (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"])
			_mode = modeAppend;
		else
			@throw [OFInvalidArgumentException exception];

		_stream = [stream retain];
		_entries = [[OFMutableArray alloc] init];
		_pathToEntryMap = [[OFMutableDictionary alloc] init];

		if (_mode == modeRead || _mode == modeAppend) {
			if (![stream isKindOfClass: [OFSeekableStream class]])
				@throw [OFInvalidArgumentException exception];

			[self of_readZIPInfo];
			[self of_readEntries];
		}

		if (_mode == modeAppend) {
			_offset = _centralDirectoryOffset;
			seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
			    (OFStreamOffset)_offset, OFSeekSet);
		}
	} @catch (id e) {
		/*
		 * If we are in write or append mode, we do not want -[close]
		 * to write anything to it on error - after all, it might not
		 * be a ZIP file which we would destroy otherwise.
		 */
		[_stream release];
		_stream = nil;

		[self release];
		@throw e;
	}

	return self;
}

- (instancetype)initWithURI: (OFURI *)URI mode: (OFString *)mode
{
	void *pool = objc_autoreleasePoolPush();
	OFStream *stream;

	@try {
		if ([mode isEqual: @"a"])
			stream = [OFURIHandler openItemAtURI: URI mode: @"r+"];
		else
			stream = [OFURIHandler openItemAtURI: URI mode: mode];
	} @catch (id e) {
		[self release];
		@throw e;
	}

	self = [self initWithStream: stream mode: mode];

	objc_autoreleasePoolPop(pool);

	return self;
}

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

	[_stream release];
	[_archiveComment release];
	[_entries release];
	[_pathToEntryMap release];

	[super dealloc];
}

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

	do {
		seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
		    offset, OFSeekEnd);

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

	if (!valid)
		@throw [OFInvalidFormatException exception];

	_diskNumber = [_stream readLittleEndianInt16];
	_centralDirectoryDisk = [_stream readLittleEndianInt16];
	_centralDirectoryEntriesInDisk = [_stream readLittleEndianInt16];
	_centralDirectoryEntries = [_stream readLittleEndianInt16];
	_centralDirectorySize = [_stream readLittleEndianInt32];
	_centralDirectoryOffset = [_stream readLittleEndianInt32];

	commentLength = [_stream readLittleEndianInt16];
	_archiveComment = [[_stream
	    readStringWithLength: commentLength
			encoding: OFStringEncodingCodepage437] copy];

	if (_diskNumber == 0xFFFF ||
	    _centralDirectoryDisk == 0xFFFF ||
	    _centralDirectoryEntriesInDisk == 0xFFFF ||
	    _centralDirectoryEntries == 0xFFFF ||
	    _centralDirectorySize == 0xFFFFFFFF ||
	    _centralDirectoryOffset == 0xFFFFFFFF) {
		int64_t offset64;
		uint64_t size;

		seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
		    offset - 20, OFSeekEnd);

		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 (offset64 < 0 || (OFStreamOffset)offset64 != offset64)
			@throw [OFOutOfRangeException exception];

		seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
		    (OFStreamOffset)offset64, OFSeekSet);

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

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

		/* version made by */
		[_stream readLittleEndianInt16];
		/* version needed to extract */
		[_stream readLittleEndianInt16];

		_diskNumber = [_stream readLittleEndianInt32];
		_centralDirectoryDisk = [_stream readLittleEndianInt32];
		_centralDirectoryEntriesInDisk =
		    [_stream readLittleEndianInt64];
		_centralDirectoryEntries = [_stream readLittleEndianInt64];
		_centralDirectorySize = [_stream readLittleEndianInt64];
		_centralDirectoryOffset = [_stream readLittleEndianInt64];

		if (_centralDirectoryOffset < 0 ||
		    (OFStreamOffset)_centralDirectoryOffset !=
		    _centralDirectoryOffset)
			@throw [OFOutOfRangeException exception];
	}

	objc_autoreleasePoolPop(pool);
}

- (void)of_readEntries
{
	void *pool = objc_autoreleasePoolPush();

	if (_centralDirectoryOffset < 0 ||
	    (OFStreamOffset)_centralDirectoryOffset != _centralDirectoryOffset)
		@throw [OFOutOfRangeException exception];

	seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
	    (OFStreamOffset)_centralDirectoryOffset, OFSeekSet);

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

		if ([_pathToEntryMap objectForKey: entry.fileName] != nil)
			@throw [OFInvalidFormatException exception];

		[_entries addObject: entry];
		[_pathToEntryMap setObject: entry forKey: entry.fileName];
	}

	objc_autoreleasePoolPop(pool);
}

- (OFArray *)entries
{
	return [[_entries copy] autorelease];
}

- (OFString *)archiveComment
{
	return _archiveComment;
}

- (void)setArchiveComment: (OFString *)comment
{
	void *pool = objc_autoreleasePoolPush();
	OFString *old;

	if (comment.UTF8StringLength > UINT16_MAX)
		@throw [OFOutOfRangeException exception];

	old = _archiveComment;
	_archiveComment = [comment copy];
	[old release];

	objc_autoreleasePoolPop(pool);
}

- (OFStream *)streamForReadingFile: (OFString *)path
{
	void *pool = objc_autoreleasePoolPush();
	OFZIPArchiveEntry *entry;
	OFZIPArchiveLocalFileHeader *localFileHeader;
	int64_t offset64;

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

	if (_mode != modeRead)
		@throw [OFInvalidArgumentException exception];

	if ((entry = [_pathToEntryMap objectForKey: path]) == nil)
		@throw [OFOpenItemFailedException exceptionWithPath: path
							       mode: @"r"
							      errNo: ENOENT];

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

	offset64 = entry.of_localFileHeaderOffset;
	if (offset64 < 0 || (OFStreamOffset)offset64 != offset64)
		@throw [OFOutOfRangeException exception];

	seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
	    (OFStreamOffset)offset64, OFSeekSet);
	localFileHeader = [[[OFZIPArchiveLocalFileHeader alloc]
	    initWithStream: _stream] autorelease];

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

	if ((localFileHeader->_minVersionNeeded & 0xFF) > 45) {
		OFString *version = [OFString stringWithFormat: @"%u.%u",
		    (localFileHeader->_minVersionNeeded & 0xFF) / 10,
		    (localFileHeader->_minVersionNeeded & 0xFF) % 10];

		@throw [OFUnsupportedVersionException
		    exceptionWithVersion: version];
	}

	objc_autoreleasePoolPop(pool);

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

	return _lastReturnedStream;
}

- (OFStream *)streamForWritingEntry: (OFZIPArchiveEntry *)entry_
{
	/* TODO: Avoid data descriptor when _stream is an OFSeekableStream */
	int64_t offsetAdd = 0;
	void *pool;
	OFMutableZIPArchiveEntry *entry;
	OFString *fileName;
	OFData *extraField;
	uint16_t fileNameLength, extraFieldLength;

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

	if (_mode != modeWrite && _mode != modeAppend)
		@throw [OFInvalidArgumentException exception];

	pool = objc_autoreleasePoolPush();
	entry = [[entry_ mutableCopy] autorelease];

	if ([_pathToEntryMap objectForKey: entry.fileName] != nil)
		@throw [OFOpenItemFailedException
		    exceptionWithPath: entry.fileName
				 mode: @"w"
				errNo: EEXIST];

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

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

	fileName = entry.fileName;
	fileNameLength = fileName.UTF8StringLength;
	extraField = entry.extraField;
	extraFieldLength = extraField.count;

	if (UINT16_MAX - extraFieldLength < 20)
		@throw [OFOutOfRangeException exception];

	entry.versionMadeBy = (entry.versionMadeBy & 0xFF00) | 45;
	entry.minVersionNeeded = (entry.minVersionNeeded & 0xFF00) | 45;
	entry.compressedSize = 0;
	entry.uncompressedSize = 0;
	entry.CRC32 = 0;
	entry.generalPurposeBitFlag |= (1u << 3) | (1u << 11);
	entry.of_localFileHeaderOffset = _offset;

	[_stream writeLittleEndianInt32: 0x04034B50];
	[_stream writeLittleEndianInt16: entry.minVersionNeeded];
	[_stream writeLittleEndianInt16: entry.generalPurposeBitFlag];
	[_stream writeLittleEndianInt16: entry.compressionMethod];
	[_stream writeLittleEndianInt16: entry.of_lastModifiedFileTime];
	[_stream writeLittleEndianInt16: entry.of_lastModifiedFileDate];
	/* We use the data descriptor */
	[_stream writeLittleEndianInt32: 0];
	/* We use ZIP64 */
	[_stream writeLittleEndianInt32: 0xFFFFFFFF];
	[_stream writeLittleEndianInt32: 0xFFFFFFFF];
	[_stream writeLittleEndianInt16: fileNameLength];
	[_stream writeLittleEndianInt16: extraFieldLength + 20];
	offsetAdd += 4 + (5 * 2) + (3 * 4) + (2 * 2);

	[_stream writeString: fileName];
	offsetAdd += fileNameLength;

	[_stream writeLittleEndianInt16: OFZIPArchiveEntryExtraFieldTagZIP64];
	[_stream writeLittleEndianInt16: 16];
	/* We use the data descriptor */
	[_stream writeLittleEndianInt64: 0];
	[_stream writeLittleEndianInt64: 0];
	offsetAdd += (2 * 2) + (2 * 8);

	if (extraField != nil)
		[_stream writeData: extraField];
	offsetAdd += extraFieldLength;

	if (INT64_MAX - _offset < offsetAdd)
		@throw [OFOutOfRangeException exception];

	_offset += offsetAdd;

	_lastReturnedStream = [[OFZIPArchiveFileWriteStream alloc]
	    of_initWithArchive: self
			stream: _stream
			 entry: entry];

	objc_autoreleasePoolPop(pool);

	return [_lastReturnedStream autorelease];
}

- (void)of_writeCentralDirectory
{
	void *pool = objc_autoreleasePoolPush();

	_centralDirectoryEntries = 0;
	_centralDirectoryEntriesInDisk = 0;
	_centralDirectorySize = 0;
	_centralDirectoryOffset = _offset;

	for (OFZIPArchiveEntry *entry in _entries) {
		_centralDirectorySize += [entry of_writeToStream: _stream];
		_centralDirectoryEntries++;
		_centralDirectoryEntriesInDisk++;
	}

	/* ZIP64 end of central directory */
	[_stream writeLittleEndianInt32: 0x06064B50];
	[_stream writeLittleEndianInt64: 44];	/* Remaining size */
	[_stream writeLittleEndianInt16: 45];	/* Version made by */
	[_stream writeLittleEndianInt16: 45];	/* Version required */
	[_stream writeLittleEndianInt32: _diskNumber];
	[_stream writeLittleEndianInt32: _centralDirectoryDisk];
	[_stream writeLittleEndianInt64: _centralDirectoryEntriesInDisk];
	[_stream writeLittleEndianInt64: _centralDirectoryEntries];
	[_stream writeLittleEndianInt64: _centralDirectorySize];
	[_stream writeLittleEndianInt64: _centralDirectoryOffset];

	/* ZIP64 end of central directory locator */
	[_stream writeLittleEndianInt32: 0x07064B50];
	[_stream writeLittleEndianInt32: _diskNumber];
	[_stream writeLittleEndianInt64:
	    _centralDirectoryOffset + _centralDirectorySize];
	[_stream writeLittleEndianInt32: 1];	/* Total number of disks */

	/* End of central directory */
	[_stream writeLittleEndianInt32: 0x06054B50];
	[_stream writeLittleEndianInt16: 0xFFFF];	/* Disk number */
	[_stream writeLittleEndianInt16: 0xFFFF];	/* CD disk */
	[_stream writeLittleEndianInt16: 0xFFFF];	/* CD entries in disk */
	[_stream writeLittleEndianInt16: 0xFFFF];	/* CD entries */
	[_stream writeLittleEndianInt32: 0xFFFFFFFF];	/* CD size */
	[_stream writeLittleEndianInt32: 0xFFFFFFFF];	/* CD offset */
	[_stream writeLittleEndianInt16: _archiveComment.UTF8StringLength];
	if (_archiveComment != nil)
		[_stream writeString: _archiveComment];

	objc_autoreleasePoolPop(pool);
}

- (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;

	if (_mode == modeWrite || _mode == modeAppend)
		[self of_writeCentralDirectory];

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

@implementation OFZIPArchiveLocalFileHeader
- (instancetype)initWithStream: (OFStream *)stream
{
	self = [super init];

	@try {
		void *pool = objc_autoreleasePoolPush();
		OFMutableData *extraField = nil;
		uint16_t fileNameLength, extraFieldLength;
		OFStringEncoding encoding;
		size_t ZIP64Index;
		uint16_t ZIP64Size;

		if ([stream readLittleEndianInt32] != 0x04034B50)
			@throw [OFInvalidFormatException exception];

		_minVersionNeeded = [stream readLittleEndianInt16];
		_generalPurposeBitFlag = [stream readLittleEndianInt16];
		_compressionMethod = [stream readLittleEndianInt16];
		_lastModifiedFileTime = [stream readLittleEndianInt16];
		_lastModifiedFileDate = [stream readLittleEndianInt16];
		_CRC32 = [stream readLittleEndianInt32];
		_compressedSize = [stream readLittleEndianInt32];
		_uncompressedSize = [stream readLittleEndianInt32];
		fileNameLength = [stream readLittleEndianInt16];
		extraFieldLength = [stream readLittleEndianInt16];
		encoding = (_generalPurposeBitFlag & (1u << 11)
		    ? OFStringEncodingUTF8 : OFStringEncodingCodepage437);

		_fileName = [[stream readStringWithLength: fileNameLength
						 encoding: encoding] copy];
		if (extraFieldLength > 0)
			extraField = [[[stream readDataWithCount:
			    extraFieldLength] mutableCopy] autorelease];

		ZIP64Index = OFZIPArchiveEntryExtraFieldFind(extraField,
		    OFZIPArchiveEntryExtraFieldTagZIP64, &ZIP64Size);

		if (ZIP64Index != OFNotFound) {
			const uint8_t *ZIP64 =
			    [extraField itemAtIndex: ZIP64Index];
			OFRange range =
			    OFMakeRange(ZIP64Index - 4, ZIP64Size + 4);

			if (_uncompressedSize == 0xFFFFFFFF)
				_uncompressedSize = OFZIPArchiveReadField64(
				    &ZIP64, &ZIP64Size);
			if (_compressedSize == 0xFFFFFFFF)
				_compressedSize = OFZIPArchiveReadField64(
				    &ZIP64, &ZIP64Size);

			if (ZIP64Size > 0)
				@throw [OFInvalidFormatException exception];

			[extraField removeItemsInRange: range];
		}

		if (extraField.count > 0) {
			[extraField makeImmutable];
			_extraField = [extraField copy];
		}

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

	return self;
}

- (void)dealloc
{
	[_fileName release];
	[_extraField release];

	[super dealloc];
}

- (bool)matchesEntry: (OFZIPArchiveEntry *)entry
{
	if (_compressionMethod != entry.compressionMethod ||
	    _lastModifiedFileTime != entry.of_lastModifiedFileTime ||
	    _lastModifiedFileDate != entry.of_lastModifiedFileDate)
		return false;

	if (!(_generalPurposeBitFlag & (1u << 3)))
		if (_CRC32 != entry.CRC32 ||
		    _compressedSize != entry.compressedSize ||
		    _uncompressedSize != entry.uncompressedSize)
			return false;

	if (![_fileName isEqual: entry.fileName])
		return false;

	return true;
}
@end

@implementation OFZIPArchiveFileReadStream
- (instancetype)of_initWithArchive: (OFZIPArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFZIPArchiveEntry *)entry
{
	self = [super init];

	@try {
		_archive = [archive retain];
		_stream = [stream retain];

		switch (entry.compressionMethod) {
		case OFZIPArchiveEntryCompressionMethodNone:
			_decompressedStream = [stream retain];
			break;
		case OFZIPArchiveEntryCompressionMethodDeflate:
			_decompressedStream = [[OFInflateStream alloc]
			    initWithStream: stream];
			break;
		case OFZIPArchiveEntryCompressionMethodDeflate64:
			_decompressedStream = [[OFInflate64Stream alloc]
			    initWithStream: stream];
			break;
		default:
			@throw [OFNotImplementedException
			    exceptionWithSelector: _cmd
					   object: nil];
		}

		_entry = [entry copy];
		_toRead = entry.uncompressedSize;
		_CRC32 = ~0;
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

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

	[_entry release];

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

	[_archive release];

	[super dealloc];
}

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

	return _atEndOfStream;
}

- (size_t)lowlevelReadIntoBuffer: (void *)buffer length: (size_t)length
{
	size_t ret;

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

	if (_atEndOfStream)
		return 0;

	if (_stream.atEndOfStream && !_decompressedStream.hasDataInReadBuffer)
		@throw [OFTruncatedDataException exception];

#if SIZE_MAX >= UINT64_MAX
	if (length > UINT64_MAX)
		@throw [OFOutOfRangeException exception];
#endif

	if (length > _toRead)
		length = (size_t)_toRead;

	ret = [_decompressedStream readIntoBuffer: buffer length: length];

	_toRead -= ret;
	_CRC32 = OFCRC32(_CRC32, buffer, ret);

	if (_toRead == 0) {
		_atEndOfStream = true;

		if (~_CRC32 != _entry.CRC32) {
			OFString *actualChecksum = [OFString stringWithFormat:
			    @"%08" PRIX32, ~_CRC32];
			OFString *expectedChecksum = [OFString stringWithFormat:
			    @"%08" PRIX32, _entry.CRC32];

			@throw [OFChecksumMismatchException
			    exceptionWithActualChecksum: actualChecksum
				       expectedChecksum: expectedChecksum];
		}
	}

	return ret;
}

- (bool)hasDataInReadBuffer
{
	return (super.hasDataInReadBuffer ||
	    _decompressedStream.hasDataInReadBuffer);
}

- (int)fileDescriptorForReading
{
	return ((id <OFReadyForReadingObserving>)_decompressedStream)
	    .fileDescriptorForReading;
}

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

	[_stream release];
	_stream = nil;

	[_decompressedStream release];
	_decompressedStream = nil;

	[super close];
}
@end

@implementation OFZIPArchiveFileWriteStream
- (instancetype)of_initWithArchive: (OFZIPArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFMutableZIPArchiveEntry *)entry
{
	self = [super init];

	_archive = [archive retain];
	_stream = [stream retain];
	_entry = [entry retain];
	_CRC32 = ~0;

	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 SIZE_MAX >= INT64_MAX
	if (length > INT64_MAX)
		@throw [OFOutOfRangeException exception];
#endif

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

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

		_bytesWritten += (unsigned long long)e.bytesWritten;
		_CRC32 = OFCRC32(_CRC32, buffer, e.bytesWritten);

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

		@throw e;
	}

	_bytesWritten += (unsigned long long)length;
	_CRC32 = OFCRC32(_CRC32, buffer, length);

	return length;
}

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

	if (_bytesWritten > UINT64_MAX)
		@throw [OFOutOfRangeException exception];

	[_stream writeLittleEndianInt32: 0x08074B50];
	[_stream writeLittleEndianInt32: _CRC32];
	[_stream writeLittleEndianInt64: (uint64_t)_bytesWritten];
	[_stream writeLittleEndianInt64: (uint64_t)_bytesWritten];

	[_stream release];
	_stream = nil;

	_entry.CRC32 = ~_CRC32;
	_entry.compressedSize = _bytesWritten;
	_entry.uncompressedSize = _bytesWritten;
	[_entry makeImmutable];

	_bytesWritten += (2 * 4 + 2 * 8);

	[_archive->_entries addObject: _entry];
	[_archive->_pathToEntryMap setObject: _entry forKey: _entry.fileName];

	if (ULLONG_MAX - _archive->_offset < _bytesWritten)
		@throw [OFOutOfRangeException exception];

	_archive->_offset += _bytesWritten;

	[super close];
}
@end