/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* 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 "OFTarArchive.h"
#import "OFTarArchiveEntry.h"
#import "OFTarArchiveEntry+Private.h"
#import "OFStream.h"
#import "OFDate.h"
#ifdef OF_HAVE_FILES
# import "OFFile.h"
#endif
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotOpenException.h"
#import "OFOutOfRangeException.h"
#import "OFTruncatedDataException.h"
#import "OFWriteFailedException.h"
@interface OFTarArchive_FileReadStream: OFStream
{
OFTarArchiveEntry *_entry;
OFStream *_stream;
uint64_t _toRead;
bool _atEndOfStream;
}
- initWithStream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry;
- (void)of_skip;
@end
@interface OFTarArchive_FileWriteStream: OFStream
{
OFTarArchiveEntry *_entry;
OFStream *_stream;
uint64_t _toWrite;
}
- initWithStream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry;
@end
@implementation OFTarArchive: OFObject
+ (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
- initWithStream: (OF_KINDOF(OFStream *))stream
mode: (OFString *)mode
{
self = [super init];
@try {
_stream = [stream retain];
if ([mode isEqual: @"r"])
_mode = OF_TAR_ARCHIVE_MODE_READ;
else if ([mode isEqual: @"w"])
_mode = OF_TAR_ARCHIVE_MODE_WRITE;
else if ([mode isEqual: @"a"])
_mode = OF_TAR_ARCHIVE_MODE_APPEND;
else
@throw [OFInvalidArgumentException exception];
if (_mode == OF_TAR_ARCHIVE_MODE_APPEND) {
union {
char c[1024];
uint32_t u32[1024 / sizeof(uint32_t)];
} buffer;
bool empty = true;
if (![_stream isKindOfClass: [OFSeekableStream class]])
@throw [OFInvalidArgumentException exception];
[stream seekToOffset: -1024
whence: SEEK_END];
[stream readIntoBuffer: buffer.c
exactLength: 1024];
for (size_t i = 0; i < 1024 / sizeof(uint32_t); i++)
if (buffer.u32[i] != 0)
empty = false;
if (!empty)
@throw [OFInvalidFormatException exception];
[stream seekToOffset: -1024
whence: SEEK_END];
}
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
#ifdef OF_HAVE_FILES
- 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];
}
- (OFTarArchiveEntry *)nextEntry
{
OFTarArchiveEntry *entry;
union {
char c[512];
uint32_t u32[512 / sizeof(uint32_t)];
} buffer;
bool empty = true;
if (_mode != OF_TAR_ARCHIVE_MODE_READ)
@throw [OFInvalidArgumentException exception];
[_lastReturnedStream of_skip];
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
if ([_stream isAtEndOfStream])
return nil;
[_stream readIntoBuffer: buffer.c
exactLength: 512];
for (size_t i = 0; i < 512 / sizeof(uint32_t); i++)
if (buffer.u32[i] != 0)
empty = false;
if (empty) {
[_stream readIntoBuffer: buffer.c
exactLength: 512];
for (size_t i = 0; i < 512 / sizeof(uint32_t); i++)
if (buffer.u32[i] != 0)
@throw [OFInvalidFormatException exception];
return nil;
}
entry = [[[OFTarArchiveEntry alloc]
of_initWithHeader: buffer.c] autorelease];
_lastReturnedStream = [[OFTarArchive_FileReadStream alloc]
initWithStream: _stream
entry: entry];
return entry;
}
- (OFStream *)streamForReadingCurrentEntry
{
if (_mode != OF_TAR_ARCHIVE_MODE_READ)
@throw [OFInvalidArgumentException exception];
return [[_lastReturnedStream retain] autorelease];
}
- (OFStream *)streamForWritingEntry: (OFTarArchiveEntry *)entry
{
void *pool;
if (_mode != OF_TAR_ARCHIVE_MODE_WRITE &&
_mode != OF_TAR_ARCHIVE_MODE_APPEND)
@throw [OFInvalidArgumentException exception];
pool = objc_autoreleasePoolPush();
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
[entry of_writeToStream: _stream];
_lastReturnedStream = [[OFTarArchive_FileWriteStream alloc]
initWithStream: _stream
entry: entry];
objc_autoreleasePoolPop(pool);
return [[_lastReturnedStream retain] autorelease];
}
- (void)close
{
if (_stream == nil)
return;
[_lastReturnedStream close];
[_lastReturnedStream release];
_lastReturnedStream = nil;
if (_mode == OF_TAR_ARCHIVE_MODE_WRITE ||
_mode == OF_TAR_ARCHIVE_MODE_APPEND) {
char buffer[1024];
memset(buffer, '\0', 1024);
[_stream writeBuffer: buffer
length: 1024];
}
[_stream release];
_stream = nil;
}
@end
@implementation OFTarArchive_FileReadStream
- initWithStream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry
{
self = [super init];
@try {
_entry = [entry copy];
_stream = [stream retain];
_toRead = [entry size];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[self close];
[_entry 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 (length > UINT64_MAX)
@throw [OFOutOfRangeException exception];
if ((uint64_t)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)hasDataInReadBuffer
{
return ([super hasDataInReadBuffer] || [_stream hasDataInReadBuffer]);
}
- (int)fileDescriptorForReading
{
return [_stream fileDescriptorForReading];
}
- (void)close
{
[_stream release];
_stream = nil;
[super close];
}
- (void)of_skip
{
char buffer[512];
uint64_t 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 size];
if (size % 512 != 0)
[_stream readIntoBuffer: buffer
exactLength: 512 - ((size_t)size % 512)];
}
@end
@implementation OFTarArchive_FileWriteStream
- initWithStream: (OFStream *)stream
entry: (OFTarArchiveEntry *)entry
{
self = [super init];
@try {
_entry = [entry copy];
_stream = [stream retain];
_toWrite = [entry size];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[self close];
[_entry release];
[super dealloc];
}
- (void)lowlevelWriteBuffer: (const void *)buffer
length: (size_t)length
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
if ((uint64_t)length > _toWrite)
@throw [OFOutOfRangeException exception];
@try {
[_stream writeBuffer: buffer
length: length];
} @catch (OFWriteFailedException *e) {
_toWrite -= [e bytesWritten];
@throw e;
}
_toWrite -= length;
}
- (bool)lowlevelIsAtEndOfStream
{
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
return (_toWrite == 0);
}
- (int)fileDescriptorForWriting
{
return [_stream fileDescriptorForWriting];
}
- (void)close
{
if (_stream == nil)
return;
uint64_t remainder = 512 - [_entry size] % 512;
if (_toWrite > 0)
@throw [OFTruncatedDataException exception];
if (remainder != 512) {
bool wasWriteBuffered = [_stream isWriteBuffered];
[_stream setWriteBuffered: true];
while (remainder--)
[_stream writeInt8: 0];
[_stream flushWriteBuffer];
[_stream setWriteBuffered: wasWriteBuffered];
}
[_stream release];
_stream = nil;
[super close];
}
@end