ObjFW  Diff

#import "OFLHAArchive.h"
#import "OFLHAArchiveEntry.h"
#import "OFLHAArchiveEntry+Private.h"
#ifdef OF_HAVE_FILES
# import "OFFile.h"
#endif
#import "OFLHADecompressingStream.h"
#import "OFStream.h"
#import "OFSeekableStream.h"
#import "OFString.h"

#import "crc16.h"

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

@interface OFLHAArchiveFileReadStream: OFStream <OFReadyForReadingObserving>
{
	OFStream *_stream, *_decompressedStream;
	OFLHAArchiveEntry *_entry;
	uint32_t _toRead, _bytesConsumed;
	uint16_t _CRC16;
	bool _atEndOfStream, _skipped;
}

- (instancetype)of_initWithStream: (OFStream *)stream
			    entry: (OFLHAArchiveEntry *)entry;
- (void)of_skip;
@end

@interface OFLHAArchiveFileWriteStream: OFStream <OFReadyForWritingObserving>
{
	OFMutableLHAArchiveEntry *_entry;
	of_string_encoding_t _encoding;
	OFSeekableStream *_stream;
	of_offset_t _headerOffset;
	uint32_t _bytesWritten;
	uint16_t _CRC16;

	OFLHAArchiveEntry *entry;
	char header[21];
	size_t headerLen;

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

	[(OFLHAArchiveFileReadStream *)_lastReturnedStream of_skip];
	[_lastReturnedStream close];
	[_lastReturnedStream release];
	_lastReturnedStream = nil;

	for (headerLen = 0; headerLen < 21;) {
		if (_stream.atEndOfStream) {
			if (headerLen == 0)

	}

	entry = [[[OFLHAArchiveEntry alloc]
	    of_initWithHeader: header
		       stream: _stream
		     encoding: _encoding] autorelease];

	_lastReturnedStream = [[OFLHAArchiveFileReadStream alloc]
	    of_initWithStream: _stream
			entry: entry];

	return entry;
}

- (OFStream <OFReadyForReadingObserving> *)streamForReadingCurrentEntry
{
	if (_mode != OF_LHA_ARCHIVE_MODE_READ)
		@throw [OFInvalidArgumentException exception];

	if (_lastReturnedStream == nil)
		@throw [OFInvalidArgumentException exception];

	return [[(OFLHAArchiveFileReadStream *)_lastReturnedStream
	    retain] autorelease];
}

- (OFStream <OFReadyForWritingObserving> *)
    streamForWritingEntry: (OFLHAArchiveEntry *)entry
{
	OFString *compressionMethod;

		@throw [OFNotImplementedException exceptionWithSelector: _cmd
								 object: self];

	[_lastReturnedStream close];
	[_lastReturnedStream release];
	_lastReturnedStream = nil;

	_lastReturnedStream = [[OFLHAArchiveFileWriteStream alloc]
	    of_initWithStream: (OFSeekableStream *)_stream
			entry: entry
		     encoding: _encoding];

	return [[(OFLHAArchiveFileWriteStream *)_lastReturnedStream
	    retain] autorelease];
}

- (void)close
{
	if (_stream == nil)
		return;

	[_lastReturnedStream close];
	[_lastReturnedStream release];
	_lastReturnedStream = nil;

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

@implementation OFLHAArchiveFileReadStream
- (instancetype)of_initWithStream: (OFStream *)stream
			    entry: (OFLHAArchiveEntry *)entry
{
	self = [super init];

	@try {
		OFString *compressionMethod;

		_stream = [stream retain];

		compressionMethod = entry.compressionMethod;

		if ([compressionMethod isEqual: @"-lh4-"] ||
		    [compressionMethod isEqual: @"-lh5-"])
			_decompressedStream = [[OFLHADecompressingStream alloc]
			    of_initWithStream: stream
				 distanceBits: 4
			       dictionaryBits: 14];
		else if ([compressionMethod isEqual: @"-lh6-"])
			_decompressedStream = [[OFLHADecompressingStream alloc]
			    of_initWithStream: stream
				 distanceBits: 5
			       dictionaryBits: 16];
		else if ([compressionMethod isEqual: @"-lh7-"])
			_decompressedStream = [[OFLHADecompressingStream alloc]
			    of_initWithStream: stream
				 distanceBits: 5
			       dictionaryBits: 17];
		else
			_decompressedStream = [stream retain];

		_entry = [entry copy];

	toRead = _toRead;

	/*
	 * Get the number of consumed bytes and directly read from the
	 * compressed stream, to make skipping much faster.
	 */
	if ([_decompressedStream isKindOfClass:
	    [OFLHADecompressingStream class]]) {
		OFLHADecompressingStream *decompressingStream =
		    (OFLHADecompressingStream *)_decompressedStream;

		[decompressingStream close];
		toRead =
		    _entry.compressedSize - decompressingStream->_bytesConsumed;

		stream = _stream;
	}

	if ([stream isKindOfClass: [OFSeekableStream class]] &&
	    (sizeof(of_offset_t) > 4 || toRead < INT32_MAX))
		[(OFSeekableStream *)stream seekToOffset: (of_offset_t)toRead

	[_decompressedStream release];
	_decompressedStream = nil;

	[super close];
}
@end

@implementation OFLHAArchiveFileWriteStream
- (instancetype)of_initWithStream: (OFSeekableStream *)stream
			    entry: (OFLHAArchiveEntry *)entry
			 encoding: (of_string_encoding_t)encoding
{
	self = [super init];

	@try {