/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018
* Jonathan Schleifer <js@heap.zone>
*
* 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.
*/
#include "config.h"
#import "OFLHAArchive.h"
#import "OFLHAArchiveEntry.h"
#import "OFLHAArchiveEntry+Private.h"
#ifdef OF_HAVE_FILES
# import "OFFile.h"
#endif
#import "OFLHAArchive_LHStream.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 OFLHAArchive_FileReadStream: OFStream <OFReadyForReadingObserving>
{
OF_KINDOF(OFStream *) _stream;
OF_KINDOF(OFStream *) _decompressedStream;
OFLHAArchiveEntry *_entry;
uint32_t _toRead, _bytesConsumed;
uint16_t _CRC16;
bool _atEndOfStream;
}
- (instancetype)of_initWithStream: (OF_KINDOF(OFStream *))stream
entry: (OFLHAArchiveEntry *)entry;
- (void)of_skip;
@end
@interface OFLHAArchive_FileWriteStream: OFStream <OFReadyForWritingObserving>
{
OFMutableLHAArchiveEntry *_entry;
of_string_encoding_t _encoding;
OF_KINDOF(OFStream *) _stream;
of_offset_t _headerOffset;
uint32_t _bytesWritten;
uint16_t _CRC16;
}
- (instancetype)of_initWithStream: (OF_KINDOF(OFStream *))stream
entry: (OFLHAArchiveEntry *)entry
encoding: (of_string_encoding_t)encoding;
@end
@implementation OFLHAArchive
@synthesize encoding = _encoding;
+ (instancetype)archiveWithStream: (OF_KINDOF(OFStream *))stream
mode: (OFString *)mode
{
return [[[self alloc] initWithStream: stream
mode: mode] autorelease];
}
#ifdef OF_HAVE_FILES
+ (instancetype)archiveWithPath: (OFString *)path
mode: (OFString *)mode
{
return [[[self alloc] initWithPath: path
mode: mode] autorelease];
}
#endif
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OF_KINDOF(OFStream *))stream
mode: (OFString *)mode
{
self = [super init];
@try {
_stream = [stream retain];
if ([mode isEqual: @"r"])
_mode = OF_LHA_ARCHIVE_MODE_READ;
else if ([mode isEqual: @"w"])
_mode = OF_LHA_ARCHIVE_MODE_WRITE;
else if ([mode isEqual: @"a"])
_mode = OF_LHA_ARCHIVE_MODE_APPEND;
else
@throw [OFInvalidArgumentException exception];
if ((_mode == OF_LHA_ARCHIVE_MODE_WRITE ||
_mode == OF_LHA_ARCHIVE_MODE_APPEND) &&
![_stream isKindOfClass: [OFSeekableStream class]])
@throw [OFInvalidArgumentException exception];
if (_mode == OF_LHA_ARCHIVE_MODE_APPEND)
[_stream seekToOffset: 0
whence: SEEK_END];
_encoding = OF_STRING_ENCODING_ISO_8859_1;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
#ifdef OF_HAVE_FILES
- (instancetype)initWithPath: (OFString *)path
mode: (OFString *)mode
{
OFFile *file;
if ([mode isEqual: @"a"])
file = [[OFFile alloc] initWithPath: path
mode: @"r+"];
else
file = [[OFFile alloc] initWithPath: path
mode: mode];
@try {
self = [self initWithStream: file
mode: mode];
} @finally {
[file release];
}
return self;
}
#endif
- (void)dealloc
{
[self close];
[super dealloc];
}
- (OFLHAArchiveEntry *)nextEntry
{
OFLHAArchiveEntry *entry;
char header[21];
size_t headerLen;
if (_mode != OF_LHA_ARCHIVE_MODE_READ)
@throw [OFInvalidArgumentException exception];
[_lastReturnedStream of_skip];
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
for (headerLen = 0; headerLen < 21;) {
if ([_stream isAtEndOfStream]) {
if (headerLen == 0)
return nil;
if (headerLen == 1 && header[0] == 0)
return nil;
@throw [OFTruncatedDataException exception];
}
headerLen += [_stream readIntoBuffer: header + headerLen
length: 21 - headerLen];
}
entry = [[[OFLHAArchiveEntry alloc]
of_initWithHeader: header
stream: _stream
encoding: _encoding] autorelease];
_lastReturnedStream = [[OFLHAArchive_FileReadStream 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 [[_lastReturnedStream retain] autorelease];
}
- (OFStream <OFReadyForWritingObserving> *)
streamForWritingEntry: (OFLHAArchiveEntry *)entry
{
OFString *compressionMethod;
if (_mode != OF_LHA_ARCHIVE_MODE_WRITE &&
_mode != OF_LHA_ARCHIVE_MODE_APPEND)
@throw [OFInvalidArgumentException exception];
compressionMethod = [entry compressionMethod];
if (![compressionMethod isEqual: @"-lh0-"] &&
![compressionMethod isEqual: @"-lhd-"])
@throw [OFNotImplementedException exceptionWithSelector: _cmd
object: self];
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
_lastReturnedStream = [[OFLHAArchive_FileWriteStream alloc]
of_initWithStream: _stream
entry: entry
encoding: _encoding];
return [[_lastReturnedStream retain] autorelease];
}
- (void)close
{
if (_stream == nil)
return;
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
[_stream release];
_stream = nil;
}
@end
@implementation OFLHAArchive_FileReadStream
- (instancetype)of_initWithStream: (OF_KINDOF(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 = [[OFLHAArchive_LHStream alloc]
of_initWithStream: stream
distanceBits: 4
dictionaryBits: 14];
else if ([compressionMethod isEqual: @"-lh6-"])
_decompressedStream = [[OFLHAArchive_LHStream alloc]
of_initWithStream: stream
distanceBits: 5
dictionaryBits: 16];
else if ([compressionMethod isEqual: @"-lh7-"])
_decompressedStream = [[OFLHAArchive_LHStream alloc]
of_initWithStream: stream
distanceBits: 5
dictionaryBits: 17];
else
_decompressedStream = [stream retain];
_entry = [entry copy];
_toRead = [entry uncompressedSize];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[self close];
[_stream release];
[_decompressedStream release];
[_entry 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 isAtEndOfStream] &&
![_decompressedStream hasDataInReadBuffer])
@throw [OFTruncatedDataException exception];
if (length > _toRead)
length = _toRead;
ret = [_decompressedStream readIntoBuffer: buffer
length: length];
_toRead -= ret;
_CRC16 = of_crc16(_CRC16, buffer, ret);
if (_toRead == 0) {
_atEndOfStream = true;
if (_CRC16 != [_entry CRC16]) {
OFString *actualChecksum = [OFString stringWithFormat:
@"%04" PRIX16, _CRC16];
OFString *expectedChecksum = [OFString stringWithFormat:
@"%04" PRIX16, [_entry CRC16]];
@throw [OFChecksumMismatchException
exceptionWithActualChecksum: actualChecksum
expectedChecksum: expectedChecksum];
}
}
return ret;
}
- (bool)hasDataInReadBuffer
{
return ([super hasDataInReadBuffer] ||
[_decompressedStream hasDataInReadBuffer]);
}
- (int)fileDescriptorForReading
{
return [_decompressedStream fileDescriptorForReading];
}
- (void)of_skip
{
OF_KINDOF(OFStream *) stream;
uint32_t toRead;
if (_stream == nil || _toRead == 0)
return;
stream = _stream;
toRead = _toRead;
/*
* Get the number of consumed bytes and directly read from the
* compressed stream, to make skipping much faster.
*/
if ([_decompressedStream isKindOfClass:
[OFLHAArchive_LHStream class]]) {
OFLHAArchive_LHStream *LHStream = _decompressedStream;
[LHStream close];
toRead = [_entry compressedSize] - LHStream->_bytesConsumed;
stream = _stream;
}
if ([stream isKindOfClass: [OFSeekableStream class]] &&
(sizeof(of_offset_t) > 4 || toRead < INT32_MAX))
[stream seekToOffset: (of_offset_t)toRead
whence: SEEK_CUR];
else {
while (toRead > 0) {
char buffer[512];
size_t min = toRead;
if (min > 512)
min = 512;
toRead -= [stream readIntoBuffer: buffer
length: min];
}
}
_toRead = 0;
}
- (void)close
{
[self of_skip];
[_stream release];
_stream = nil;
[_decompressedStream release];
_decompressedStream = nil;
[super close];
}
@end
@implementation OFLHAArchive_FileWriteStream
- (instancetype)of_initWithStream: (OF_KINDOF(OFStream *))stream
entry: (OFLHAArchiveEntry *)entry
encoding: (of_string_encoding_t)encoding
{
self = [super init];
@try {
_entry = [entry mutableCopy];
_encoding = encoding;
_headerOffset = [stream seekToOffset: 0
whence: SEEK_CUR];
[_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];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[self close];
[_entry release];
[super dealloc];
}
- (size_t)lowlevelWriteBuffer: (const void *)buffer
length: (size_t)length
{
uint32_t bytesWritten;
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
if (UINT32_MAX - _bytesWritten < length)
@throw [OFOutOfRangeException exception];
@try {
bytesWritten = (uint32_t)[_stream writeBuffer: buffer
length: length];
} @catch (OFWriteFailedException *e) {
_bytesWritten += [e bytesWritten];
_CRC16 = of_crc16(_CRC16, buffer, [e bytesWritten]);
@throw e;
}
_bytesWritten += (uint32_t)bytesWritten;
_CRC16 = of_crc16(_CRC16, buffer, bytesWritten);
return bytesWritten;
}
- (bool)lowlevelIsAtEndOfStream
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
return [_stream isAtEndOfStream];
}
- (int)fileDescriptorForWriting
{
return [_stream fileDescriptorForWriting];
}
- (void)close
{
of_offset_t offset;
if (_stream == nil)
return;
[_entry setUncompressedSize: _bytesWritten];
[_entry setCompressedSize: _bytesWritten];
[_entry setCRC16: _CRC16];
offset = [_stream seekToOffset: 0
whence:SEEK_CUR];
[_stream seekToOffset: _headerOffset
whence: SEEK_SET];
[_entry of_writeToStream: _stream
encoding: _encoding];
[_stream seekToOffset: offset
whence: SEEK_SET];
[_stream release];
_stream = nil;
[super close];
}
@end