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#import "crc16.h"
#import "OFChecksumMismatchException.h"
#import "OFInvalidArgumentException.h"
#import "OFNotImplementedException.h"
#import "OFNotOpenException.h"
#import "OFTruncatedDataException.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
@implementation OFLHAArchive
@synthesize encoding = _encoding;
+ (instancetype)archiveWithStream: (OF_KINDOF(OFStream *))stream
mode: (OFString *)mode
{
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#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
{
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- (instancetype)initWithStream: (OF_KINDOF(OFStream *))stream
mode: (OFString *)mode
{
self = [super init];
@try {
if (![mode isEqual: @"r"])
@throw [OFNotImplementedException
exceptionWithSelector: _cmd
object: self];
_stream = [stream retain];
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- (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;
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[self close];
[super dealloc];
}
- (OFLHAArchiveEntry *)nextEntry
{
char header[21];
size_t headerLen;
[_lastEntry release];
_lastEntry = nil;
[_lastReturnedStream of_skip];
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
for (headerLen = 0; headerLen < 21;) {
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[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;) {
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@throw [OFTruncatedDataException exception];
}
headerLen += [_stream readIntoBuffer: header + headerLen
length: 21 - headerLen];
}
_lastEntry = [[OFLHAArchiveEntry alloc]
of_initWithHeader: header
stream: _stream
encoding: _encoding];
_lastReturnedStream = [[OFLHAArchive_FileReadStream alloc]
of_initWithStream: _stream
entry: _lastEntry];
return [[_lastEntry copy] autorelease];
}
- (OFStream <OFReadyForReadingObserving> *)streamForReadingCurrentEntry
{
if (_lastReturnedStream == nil)
@throw [OFInvalidArgumentException exception];
return [[_lastReturnedStream retain] autorelease];
}
- (void)close
{
if (_stream == nil)
return;
[_lastEntry release];
_lastEntry = nil;
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@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
{
if (_mode != OF_LHA_ARCHIVE_MODE_WRITE &&
_mode != OF_LHA_ARCHIVE_MODE_APPEND)
@throw [OFInvalidArgumentException exception];
if (![[entry compressionMethod] isEqual: @"-lh0-"])
@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;
}
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[self of_skip];
[_stream release];
_stream = nil;
[_decompressedStream release];
_decompressedStream = nil;
[super close];
}
@end
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[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
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