ObjFW  Diff

 *
 * 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"

	modeAppend
};

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

- (void)of_writeCentralDirectory;
@end

OF_DIRECT_MEMBERS
@interface OFZIPArchiveLocalFileHeader: OFObject
{
@public

- (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;

	*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 *)URIForFilePath: (OFString *)path inArchiveWithURI: (OFURI *)URI
{
	return OFArchiveURIHandlerURIForFileInArchive(@"zip", path, URI);
}

- (instancetype)init
{
	OF_INVALID_INIT_METHOD
}

- (instancetype)initWithStream: (OFStream *)stream mode: (OFString *)mode

			[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);

	    _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];

		_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];

	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;

				 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)

	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;

}

- (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;
}

		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);

		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:

- (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];

		@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);

	_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