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_LHA_ARCHIVE_M

#include "config.h"

#include <errno.h>

#import "OFLHAArchive.h"
#import "OFLHAArchiveEntry.h"
#import "OFLHAArchiveEntry+Private.h"
#import "OFArchiveURIHandler.h"

#import "OFCRC16.h"

#import "OFLHADecompressingStream.h"
#import "OFSeekableStream.h"
#import "OFStream.h"
#import "OFString.h"
#import "OFURI.h"
#import "OFURIHandler.h"

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

enum {
	modeRead,
	modeWrite,
	modeAppend
};

OF_DIRECT_MEMBERS
@interface OFLHAArchiveFileReadStream: OFStream <OFReadyForReadingObserving>
{
	OFLHAArchive *_archive;
	OFStream *_stream, *_decompressedStream;
	OFLHAArchiveEntry *_entry;
	unsigned long long _toRead;
	uint16_t _CRC16;
	bool _atEndOfStream, _skipped;
}

- (instancetype)of_initWithArchive: (OFLHAArchive *)archive
			    stream: (OFStream *)stream
			     entry: (OFLHAArchiveEntry *)entry;
- (void)of_skip;
@end

OF_DIRECT_MEMBERS
@interface OFLHAArchiveFileWriteStream: OFStream <OFReadyForWritingObserving>
{
	OFLHAArchive *_archive;
	OFMutableLHAArchiveEntry *_entry;
	OFStringEncoding _encoding;
	OFSeekableStream *_stream;
	OFStreamOffset _headerOffset;
	uint32_t _bytesWritten;
	uint16_t _CRC16;
}

- (instancetype)of_initWithArchive: (OFLHAArchive *)archive
			    stream: (OFSeekableStream *)stream
			     entry: (OFLHAArchiveEntry *)entry
			  encoding: (OFStringEncoding)encoding;
@end

@implementation OFLHAArchive
@synthesize encoding = _encoding;

+ (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(@"lha", path, URI);
}

- (instancetype)init
{
	OF_INVALID_INIT_METHOD
}

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

		if ((_mode == modeWrite || _mode == modeAppend) &&
		    ![_stream isKindOfClass: [OFSeekableStream class]])
			@throw [OFInvalidArgumentException exception];

		if (_mode == modeAppend)
			[(OFSeekableStream *)_stream seekToOffset: 0
							   whence: OFSeekEnd];

		_encoding = OFStringEncodingISO8859_1;
	} @catch (id e) {
		[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];

	[_currentEntry release];

	[super dealloc];
}

- (OFLHAArchiveEntry *)nextEntry
{

	char header[21];
	size_t headerLen;

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

	[_currentEntry release];
	_currentEntry = nil;

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

	_lastReturnedStream = nil;

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

			if (headerLen == 1 && header[0] == 0)
				return nil;

			@throw [OFTruncatedDataException exception];
		}

		headerLen += [_stream readIntoBuffer: header + headerLen
					      length: 21 - headerLen];
	}

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





	return _currentEntry;
}

- (OFStream *)streamForReadingCurrentEntry
{
	if (_mode != modeRead)
		@throw [OFInvalidArgumentException exception];

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

	_lastReturnedStream = [[[OFLHAArchiveFileReadStream alloc]
	    of_initWithArchive: self
			stream: _stream
			 entry: _currentEntry] autorelease];
	[_currentEntry release];
	_currentEntry = nil;

	return _lastReturnedStream;
}

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

	if (_mode != modeWrite && _mode != modeAppend)

								 object: self];

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

	_lastReturnedStream = nil;

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

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

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

	@try {
		OFString *compressionMethod;

		_archive = [archive retain];
		_stream = [stream retain];

		compressionMethod = entry.compressionMethod;

		if ([compressionMethod isEqual: @"-lh4-"] ||
		    [compressionMethod isEqual: @"-lh5-"])
			_decompressedStream = [[OFLHADecompressingStream alloc]

- (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];

	if (_atEndOfStream)
		return 0;

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

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

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

	_toRead -= ret;
	_CRC16 = OFCRC16(_CRC16, buffer, ret);

	if (_toRead == 0) {

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

- (void)of_skip
{
	OFStream *stream;
	unsigned long long toRead;

	if (_stream == nil || _skipped)
		return;

	stream = _stream;
	toRead = _toRead;

		toRead =
		    _entry.compressedSize - decompressingStream.bytesConsumed;

		stream = _stream;
	}

	if ([stream isKindOfClass: [OFSeekableStream class]] &&
	    toRead < LLONG_MAX && (long long)toRead == (OFStreamOffset)toRead)
		[(OFSeekableStream *)stream seekToOffset: (OFStreamOffset)toRead
						  whence: OFSeekCurrent];
	else {
		while (toRead > 0) {
			char buffer[512];
			unsigned long long min = toRead;

			if (min > 512)
				min = 512;

			toRead -= [stream readIntoBuffer: buffer
						  length: (size_t)min];
		}
	}

	_toRead = 0;
	_skipped = true;
}

	_decompressedStream = nil;

	[super close];
}
@end

@implementation OFLHAArchiveFileWriteStream
- (instancetype)of_initWithArchive: (OFLHAArchive *)archive
			    stream: (OFSeekableStream *)stream
			     entry: (OFLHAArchiveEntry *)entry
			  encoding: (OFStringEncoding)encoding
{
	self = [super init];

	@try {
		_archive = [archive retain];
		_entry = [entry mutableCopy];
		_encoding = encoding;

		_headerOffset = [stream seekToOffset: 0 whence: OFSeekCurrent];
		[_entry of_writeToStream: stream encoding: _encoding];

		/*
		 * Retain stream last, so that -[close] called by -[dealloc]
		 * doesn't write in case of an error.
		 */
		_stream = [stream retain];

- (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)

{
	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];
	[_stream seekToOffset: _headerOffset whence: OFSeekSet];
	[_entry of_writeToStream: _stream encoding: _encoding];
	[_stream seekToOffset: offset whence: OFSeekSet];

	[_stream release];
	_stream = nil;

	[super close];
}
@end