/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#define OF_TAR_ARCHIVE_M
#include "config.h"
#include <errno.h>
#import "OFTarArchive.h"
#import "OFTarArchiveEntry.h"
#import "OFTarArchiveEntry+Private.h"
#import "OFArchiveIRIHandler.h"
#import "OFDate.h"
#import "OFIRI.h"
#import "OFIRIHandler.h"
#import "OFKernelEventObserver.h"
#import "OFSeekableStream.h"
#import "OFStream.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotOpenException.h"
#import "OFOutOfRangeException.h"
#import "OFTruncatedDataException.h"
#import "OFWriteFailedException.h"
enum {
modeRead,
modeWrite,
modeAppend
};
OF_DIRECT_MEMBERS
@interface OFTarArchiveFileReadStream: OFStream <OFReadyForReadingObserving>
{
OFTarArchive *_archive;
OFTarArchiveEntry *_entry;
OFStream *_stream;
unsigned long long _toRead;
bool _atEndOfStream, _skipped;
}
- (instancetype)of_initWithArchive: (OFTarArchive *)archive
stream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry;
- (void)of_skip;
@end
OF_DIRECT_MEMBERS
@interface OFTarArchiveFileWriteStream: OFStream <OFReadyForWritingObserving>
{
OFTarArchive *_archive;
OFTarArchiveEntry *_entry;
OFStream *_stream;
unsigned long long _toWrite;
}
- (instancetype)of_initWithArchive: (OFTarArchive *)archive
stream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry;
@end
@implementation OFTarArchive: OFObject
@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];
}
+ (OFIRI *)IRIForFilePath: (OFString *)path inArchiveWithIRI: (OFIRI *)IRI
{
return OFArchiveIRIHandlerIRIForFileInArchive(@"tar", path, IRI);
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OFStream *)stream mode: (OFString *)mode
{
self = [super init];
@try {
_stream = [stream retain];
if ([mode isEqual: @"r"])
_mode = modeRead;
else if ([mode isEqual: @"w"])
_mode = modeWrite;
else if ([mode isEqual: @"a"])
_mode = modeAppend;
else
@throw [OFInvalidArgumentException exception];
if (_mode == modeAppend) {
uint32_t buffer[1024 / sizeof(uint32_t)];
bool empty = true;
if (![_stream isKindOfClass: [OFSeekableStream class]])
@throw [OFInvalidArgumentException exception];
[(OFSeekableStream *)_stream seekToOffset: -1024
whence: OFSeekEnd];
[_stream readIntoBuffer: buffer exactLength: 1024];
for (size_t i = 0; i < 1024 / sizeof(uint32_t); i++)
if (buffer[i] != 0)
empty = false;
if (!empty)
@throw [OFInvalidFormatException exception];
[(OFSeekableStream *)stream seekToOffset: -1024
whence: OFSeekEnd];
}
_encoding = OFStringEncodingUTF8;
} @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
{
[self close];
[_currentEntry release];
[super dealloc];
}
- (OFTarArchiveEntry *)nextEntry
{
uint32_t buffer[512 / sizeof(uint32_t)];
bool empty = true;
if (_mode != modeRead)
@throw [OFInvalidArgumentException exception];
if (_currentEntry != nil && _lastReturnedStream == nil) {
/*
* No read stream was created since the last call to
* -[nextEntry]. Create it so that we can properly skip the
* data.
*/
void *pool = objc_autoreleasePoolPush();
[self streamForReadingCurrentEntry];
objc_autoreleasePoolPop(pool);
}
[_currentEntry release];
_currentEntry = nil;
[(OFTarArchiveFileReadStream *)_lastReturnedStream of_skip];
@try {
[_lastReturnedStream close];
} @catch (OFNotOpenException *e) {
/* Might have already been closed by the user - that's fine. */
}
_lastReturnedStream = nil;
if (_stream.atEndOfStream)
return nil;
[_stream readIntoBuffer: buffer exactLength: 512];
for (size_t i = 0; i < 512 / sizeof(uint32_t); i++)
if (buffer[i] != 0)
empty = false;
if (empty) {
[_stream readIntoBuffer: buffer exactLength: 512];
for (size_t i = 0; i < 512 / sizeof(uint32_t); i++)
if (buffer[i] != 0)
@throw [OFInvalidFormatException exception];
return nil;
}
_currentEntry = [[OFTarArchiveEntry alloc]
of_initWithHeader: (unsigned char *)buffer
encoding: _encoding];
return _currentEntry;
}
- (OFStream *)streamForReadingCurrentEntry
{
if (_mode != modeRead)
@throw [OFInvalidArgumentException exception];
if (_currentEntry == nil)
@throw [OFInvalidArgumentException exception];
_lastReturnedStream = [[[OFTarArchiveFileReadStream alloc]
of_initWithArchive: self
stream: _stream
entry: _currentEntry] autorelease];
[_currentEntry release];
_currentEntry = nil;
return _lastReturnedStream;
}
- (OFStream *)streamForWritingEntry: (OFTarArchiveEntry *)entry
{
if (_mode != modeWrite && _mode != modeAppend)
@throw [OFInvalidArgumentException exception];
@try {
[_lastReturnedStream close];
} @catch (OFNotOpenException *e) {
/* Might have already been closed by the user - that's fine. */
}
_lastReturnedStream = nil;
[entry of_writeToStream: _stream encoding: _encoding];
_lastReturnedStream = [[[OFTarArchiveFileWriteStream alloc]
of_initWithArchive: self
stream: _stream
entry: entry] autorelease];
return _lastReturnedStream;
}
- (void)close
{
if (_stream == nil)
return;
@try {
[_lastReturnedStream close];
} @catch (OFNotOpenException *e) {
/* Might have already been closed by the user - that's fine. */
}
_lastReturnedStream = nil;
if (_mode == modeWrite || _mode == modeAppend) {
char buffer[1024];
memset(buffer, '\0', 1024);
[_stream writeBuffer: buffer length: 1024];
}
[_stream release];
_stream = nil;
}
@end
@implementation OFTarArchiveFileReadStream
- (instancetype)of_initWithArchive: (OFTarArchive *)archive
stream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry
{
self = [super init];
@try {
_archive = [archive retain];
_entry = [entry copy];
_stream = [stream retain];
_toRead = entry.uncompressedSize;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
if (_stream != nil)
[self close];
[_entry release];
if (_archive->_lastReturnedStream == self)
_archive->_lastReturnedStream = nil;
[_archive release];
[super dealloc];
}
- (size_t)lowlevelReadIntoBuffer: (void *)buffer length: (size_t)length
{
size_t ret;
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
if (_atEndOfStream)
return 0;
#if SIZE_MAX >= ULLONG_MAX
if (length > ULLONG_MAX)
@throw [OFOutOfRangeException exception];
#endif
if ((unsigned long long)length > _toRead)
length = (size_t)_toRead;
ret = [_stream readIntoBuffer: buffer length: length];
if (ret == 0)
_atEndOfStream = true;
_toRead -= ret;
return ret;
}
- (bool)lowlevelIsAtEndOfStream
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
return _atEndOfStream;
}
- (bool)lowlevelHasDataInReadBuffer
{
return _stream.hasDataInReadBuffer;
}
- (int)fileDescriptorForReading
{
return ((id <OFReadyForReadingObserving>)_stream)
.fileDescriptorForReading;
}
- (void)close
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
[self of_skip];
[_stream release];
_stream = nil;
[super close];
}
- (void)of_skip
{
if (_stream == nil || _skipped)
return;
if ([_stream isKindOfClass: [OFSeekableStream class]] &&
_toRead <= LLONG_MAX &&
(OFStreamOffset)_toRead == (long long)_toRead) {
unsigned long long size;
[(OFSeekableStream *)_stream
seekToOffset: (OFStreamOffset)_toRead
whence: OFSeekCurrent];
_toRead = 0;
size = _entry.uncompressedSize;
if (size % 512 != 0)
[(OFSeekableStream *)_stream
seekToOffset: 512 - (size % 512)
whence: OFSeekCurrent];
} else {
char buffer[512];
unsigned long long size;
while (_toRead >= 512) {
[_stream readIntoBuffer: buffer exactLength: 512];
_toRead -= 512;
}
if (_toRead > 0) {
[_stream readIntoBuffer: buffer
exactLength: (size_t)_toRead];
_toRead = 0;
}
size = _entry.uncompressedSize;
if (size % 512 != 0)
[_stream readIntoBuffer: buffer
exactLength: (size_t)(512 - (size % 512))];
}
_skipped = true;
}
@end
@implementation OFTarArchiveFileWriteStream
- (instancetype)of_initWithArchive: (OFTarArchive *)archive
stream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry
{
self = [super init];
@try {
_archive = [archive retain];
_entry = [entry copy];
_stream = [stream retain];
_toWrite = entry.uncompressedSize;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (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)
@throw [OFNotOpenException exceptionWithObject: self];
if (length > _toWrite)
@throw [OFOutOfRangeException exception];
@try {
[_stream writeBuffer: buffer length: length];
} @catch (OFWriteFailedException *e) {
OFEnsure(e.bytesWritten <= length);
_toWrite -= e.bytesWritten;
if (e.errNo == EWOULDBLOCK || e.errNo == EAGAIN)
return e.bytesWritten;
@throw e;
}
_toWrite -= length;
return length;
}
- (bool)lowlevelIsAtEndOfStream
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
return (_toWrite == 0);
}
- (int)fileDescriptorForWriting
{
return ((id <OFReadyForWritingObserving>)_stream)
.fileDescriptorForWriting;
}
- (void)close
{
unsigned long long remainder;
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
if (_toWrite > 0)
@throw [OFTruncatedDataException exception];
remainder = 512 - _entry.uncompressedSize % 512;
if (remainder != 512) {
bool didBufferWrites = _stream.buffersWrites;
_stream.buffersWrites = true;
while (remainder--)
[_stream writeInt8: 0];
[_stream flushWriteBuffer];
_stream.buffersWrites = didBufferWrites;
}
[_stream release];
_stream = nil;
[super close];
}
@end