/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* 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.
*/
#define OF_ZOO_ARCHIVE_M
#include "config.h"
#import "OFZooArchive.h"
#import "OFZooArchiveEntry.h"
#import "OFZooArchiveEntry+Private.h"
#import "OFCRC16.h"
#import "OFIRI.h"
#import "OFIRIHandler.h"
#import "OFLHADecompressingStream.h"
#import "OFSeekableStream.h"
#import "OFStream.h"
#import "OFString.h"
#import "OFChecksumMismatchException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotOpenException.h"
#import "OFTruncatedDataException.h"
#import "OFUnsupportedVersionException.h"
enum {
modeRead
};
OF_DIRECT_MEMBERS
@interface OFZooArchive ()
- (void)of_readArchiveHeader;
@end
OF_DIRECT_MEMBERS
@interface OFZooArchiveFileReadStream: OFStream <OFReadyForReadingObserving>
{
OFZooArchive *_archive;
OF_KINDOF(OFStream *) _stream;
OFStream *_decompressedStream;
OFZooArchiveEntry *_entry;
unsigned long long _toRead;
uint16_t _CRC16;
bool _atEndOfStream;
}
- (instancetype)of_initWithArchive: (OFZooArchive *)archive
stream: (OFStream *)stream
entry: (OFZooArchiveEntry *)entry;
@end
@implementation OFZooArchive
@synthesize encoding = _encoding;
+ (instancetype)archiveWithStream: (OFStream *)stream mode: (OFString *)mode
{
return [[[self alloc] initWithStream: stream mode: mode] autorelease];
}
+ (instancetype)archiveWithIRI: (OFIRI *)IRI mode: (OFString *)mode
{
return [[[self alloc] initWithIRI: IRI mode: mode] autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OFStream *)stream mode: (OFString *)mode
{
self = [super init];
@try {
if ([mode isEqual: @"r"])
_mode = modeRead;
else
@throw [OFInvalidArgumentException exception];
_stream = [stream retain];
_encoding = OFStringEncodingUTF8;
if (_mode == modeRead) {
if (![stream isKindOfClass: [OFSeekableStream class]])
@throw [OFInvalidArgumentException exception];
[self of_readArchiveHeader];
}
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (instancetype)initWithIRI: (OFIRI *)IRI mode: (OFString *)mode
{
void *pool = objc_autoreleasePoolPush();
OFStream *stream;
@try {
if ([mode isEqual: @"a"])
stream = [OFIRIHandler openItemAtIRI: IRI mode: @"r+"];
else
stream = [OFIRIHandler openItemAtIRI: IRI 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];
}
- (void)of_readArchiveHeader
{
char headerText[20];
uint32_t firstFileOffset;
[_stream readIntoBuffer: headerText exactLength: 20];
if ([_stream readLittleEndianInt32] != 0xFDC4A7DC)
@throw [OFInvalidFormatException exception];
firstFileOffset = [_stream readLittleEndianInt32];
if ([_stream readLittleEndianInt32] != ~(uint32_t)(firstFileOffset - 1))
@throw [OFInvalidFormatException exception];
/* Version */
[_stream readBigEndianInt16];
[_stream seekToOffset: firstFileOffset whence: OFSeekSet];
}
- (OFZooArchiveEntry *)nextEntry
{
if (_mode != modeRead)
@throw [OFInvalidArgumentException exception];
if (_currentEntry != nil)
[_stream seekToOffset: _currentEntry->_nextHeaderOffset
whence: OFSeekSet];
[_currentEntry release];
_currentEntry = nil;
@try {
[_lastReturnedStream close];
} @catch (OFNotOpenException *e) {
/* Might have already been closed by the user - that's fine. */
}
_lastReturnedStream = nil;
_currentEntry = [[OFZooArchiveEntry alloc]
of_initWithStream: _stream
encoding: _encoding];
if (_currentEntry->_nextHeaderOffset == 0) {
/*
* End of archive is marked by a header that has the next
* header's offset set to 0.
*/
[_currentEntry release];
_currentEntry = nil;
}
return _currentEntry;
}
- (OFStream *)streamForReadingCurrentEntry
{
if (_mode != modeRead)
@throw [OFInvalidArgumentException exception];
if (_currentEntry == nil)
@throw [OFInvalidArgumentException exception];
_lastReturnedStream = [[[OFZooArchiveFileReadStream alloc]
of_initWithArchive: self
stream: _stream
entry: _currentEntry] 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 OFZooArchiveFileReadStream
- (instancetype)of_initWithArchive: (OFZooArchive *)archive
stream: (OFStream *)stream
entry: (OFZooArchiveEntry *)entry
{
self = [super init];
@try {
_archive = [archive retain];
_stream = [stream retain];
switch (entry.compressionMethod) {
case 0:
_decompressedStream = [stream retain];
break;
case 2:
_decompressedStream = [[OFLHADecompressingStream alloc]
of_initWithStream: stream
distanceBits: 4
dictionaryBits: 14];
break;
default:
@throw [OFUnsupportedVersionException
exceptionWithVersion: [OFString
stringWithFormat: @"%u", entry.compressionMethod]];
}
_entry = [entry copy];
_toRead = entry.uncompressedSize;
[_stream seekToOffset: entry->_dataOffset whence: OFSeekSet];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (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];
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 = (size_t)_toRead;
ret = [_decompressedStream readIntoBuffer: buffer length: length];
_toRead -= ret;
_CRC16 = OFCRC16(_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 ((id <OFReadyForReadingObserving>)_decompressedStream)
.fileDescriptorForReading;
}
- (void)close
{
if (_stream == nil || _decompressedStream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
[_stream release];
_stream = nil;
[_decompressedStream release];
_decompressedStream = nil;
[super close];
}
@end