/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
* Jonathan Schleifer <js@webkeks.org>
*
* 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"
#include <stdio.h>
#import "OFZIPArchive.h"
#import "OFZIPArchiveEntry.h"
#import "OFDictionary.h"
#import "OFFile.h"
#import "OFChecksumFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFOpenFileFailedException.h"
#import "OFReadFailedException.h"
#import "OFUnsupportedVersionException.h"
#import "autorelease.h"
#import "macros.h"
#define CRC32_MAGIC 0xEDB88320
/*
* FIXME: Current limitations:
* - Compressed files cannot be read.
* - Encrypted files cannot be read.
* - Split archives are not supported.
* - Write support is missing.
* - The ZIP has to be a file on the local file system.
* - No support for ZIP64.
*/
@interface OFZIPArchive_LocalFileHeader: OFObject
{
@public
uint16_t _minVersion, _generalPurposeBitFlag, _compressionMethod;
uint16_t _lastModifiedFileTime, _lastModifiedFileDate;
uint32_t _CRC32, _compressedSize, _uncompressedSize;
OFString *_fileName;
OFDataArray *_extraField;
}
- initWithFile: (OFFile*)file;
- (bool)matchesEntry: (OFZIPArchiveEntry*)entry;
@end
@interface OFZIPArchive_FileStream: OFStream
{
OFFile *_file;
size_t _size;
uint32_t _expectedCRC32, _CRC32;
bool _atEndOfStream;
}
- initWithArchiveFile: (OFString*)path
offset: (off_t)offset
size: (size_t)size
CRC32: (uint32_t)CRC32;
@end
static uint32_t
crc32(uint32_t crc, uint8_t *bytes, size_t length)
{
size_t i;
for (i = 0; i < length; i++) {
uint_fast8_t j;
crc ^= bytes[i];
for (j = 0; j < 8; j++)
crc = (crc >> 1) ^ (CRC32_MAGIC & (~(crc & 1) + 1));
}
return crc;
}
@implementation OFZIPArchive
+ (instancetype)archiveWithPath: (OFString*)path
{
return [[[self alloc] initWithPath: path] autorelease];
}
- initWithPath: (OFString*)path
{
self = [super init];
@try {
_file = [[OFFile alloc] initWithPath: path
mode: @"rb"];
_path = [path copy];
[self OF_readZIPInfo];
[self OF_readEntries];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_file release];
[_path release];
[_archiveComment release];
[_entries release];
[super dealloc];
}
- (void)OF_readZIPInfo
{
void *pool = objc_autoreleasePoolPush();
uint16_t commentLength;
[_file seekToOffset: -22
whence: SEEK_END];
if ([_file readLittleEndianInt32] != 0x06054B50)
@throw [OFInvalidFormatException exception];
_diskNumber = [_file readLittleEndianInt16],
_centralDirectoryDisk = [_file readLittleEndianInt16];
_centralDirectoryEntriesInDisk = [_file readLittleEndianInt16];
_centralDirectoryEntries = [_file readLittleEndianInt16];
_centralDirectorySize = [_file readLittleEndianInt32];
_centralDirectoryOffset = [_file readLittleEndianInt32];
commentLength = [_file readLittleEndianInt16];
_archiveComment = [[_file
readStringWithLength: commentLength
encoding: OF_STRING_ENCODING_CODEPAGE_437] copy];
objc_autoreleasePoolPop(pool);
}
- (void)OF_readEntries
{
void *pool = objc_autoreleasePoolPush();
size_t i;
[_file seekToOffset: _centralDirectoryOffset
whence: SEEK_SET];
_entries = [[OFMutableDictionary alloc] init];
for (i = 0; i < _centralDirectoryEntries; i++) {
OFZIPArchiveEntry *entry = [[[OFZIPArchiveEntry alloc]
OF_initWithFile: _file] autorelease];
if ([_entries objectForKey: [entry fileName]] != nil)
@throw [OFInvalidFormatException exception];
[_entries setObject: entry
forKey: [entry fileName]];
}
[_entries makeImmutable];
objc_autoreleasePoolPop(pool);
}
- (OFDictionary*)entries
{
OF_GETTER(_entries, true)
}
- (OFString*)archiveComment
{
OF_GETTER(_archiveComment, true)
}
- (OFStream*)streamForReadingFile: (OFString*)path
{
OFStream *ret;
void *pool = objc_autoreleasePoolPush();
OFZIPArchiveEntry *entry = [_entries objectForKey: path];
OFZIPArchive_LocalFileHeader *localFileHeader;
if (entry == nil) {
errno = ENOENT;
@throw [OFOpenFileFailedException exceptionWithPath: path
mode: @"rb"];
}
[_file seekToOffset: [entry OF_localFileHeaderOffset]
whence: SEEK_SET];
localFileHeader = [[[OFZIPArchive_LocalFileHeader alloc]
initWithFile: _file] autorelease];
if (![localFileHeader matchesEntry: entry])
@throw [OFInvalidFormatException exception];
if (localFileHeader->_minVersion > 10) {
OFString *version = [OFString stringWithFormat: @"%u.%u",
localFileHeader->_minVersion / 10,
localFileHeader->_minVersion % 10];
@throw [OFUnsupportedVersionException
exceptionWithVersion: version];
}
if (localFileHeader->_compressionMethod != 0)
@throw [OFNotImplementedException exceptionWithSelector: _cmd
object: self];
ret = [[OFZIPArchive_FileStream alloc]
initWithArchiveFile: _path
offset: [_file seekToOffset: 0
whence: SEEK_CUR]
size: localFileHeader->_uncompressedSize
CRC32: localFileHeader->_CRC32];
objc_autoreleasePoolPop(pool);
return [ret autorelease];
}
@end
@implementation OFZIPArchive_LocalFileHeader
- initWithFile: (OFFile*)file
{
self = [super init];
@try {
uint16_t fileNameLength, extraFieldLength;
of_string_encoding_t encoding;
if ([file readLittleEndianInt32] != 0x04034B50)
@throw [OFInvalidFormatException exception];
_minVersion = [file readLittleEndianInt16];
_generalPurposeBitFlag = [file readLittleEndianInt16];
_compressionMethod = [file readLittleEndianInt16];
_lastModifiedFileTime = [file readLittleEndianInt16];
_lastModifiedFileDate = [file readLittleEndianInt16];
_CRC32 = [file readLittleEndianInt32];
_compressedSize = [file readLittleEndianInt32];
_uncompressedSize = [file readLittleEndianInt32];
fileNameLength = [file readLittleEndianInt16];
extraFieldLength = [file readLittleEndianInt16];
encoding = (_generalPurposeBitFlag & (1 << 11)
? OF_STRING_ENCODING_UTF_8
: OF_STRING_ENCODING_CODEPAGE_437);
_fileName = [[file readStringWithLength: fileNameLength
encoding: encoding] copy];
_extraField = [[file
readDataArrayWithCount: extraFieldLength] retain];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_fileName release];
[_extraField release];
[super dealloc];
}
- (bool)matchesEntry: (OFZIPArchiveEntry*)entry
{
if (_minVersion != [entry OF_minVersion] ||
_generalPurposeBitFlag != [entry OF_generalPurposeBitFlag] ||
_compressionMethod != [entry OF_compressionMethod] ||
_lastModifiedFileTime != [entry OF_lastModifiedFileTime] ||
_lastModifiedFileDate != [entry OF_lastModifiedFileDate] ||
_CRC32 != [entry CRC32] ||
_compressedSize != [entry compressedSize] ||
_uncompressedSize != [entry uncompressedSize] ||
![_fileName isEqual: [entry fileName]])
return false;
return true;
}
@end
@implementation OFZIPArchive_FileStream
- initWithArchiveFile: (OFString*)path
offset: (off_t)offset
size: (size_t)size
CRC32: (uint32_t)CRC32
{
self = [super init];
@try {
_file = [[OFFile alloc] initWithPath: path
mode: @"rb"];
[_file seekToOffset: offset
whence: SEEK_SET];
_size = size;
_CRC32 = ~0;
_expectedCRC32 = CRC32;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_file release];
[super dealloc];
}
- (bool)lowlevelIsAtEndOfStream
{
return _atEndOfStream;
}
- (size_t)lowlevelReadIntoBuffer: (void*)buffer
length: (size_t)length
{
size_t min, ret;
if (_atEndOfStream)
@throw [OFReadFailedException exceptionWithStream: self
requestedLength: length];
if (_size == 0) {
_atEndOfStream = true;
if (~_CRC32 != _expectedCRC32)
@throw [OFChecksumFailedException exception];
return 0;
}
if (length < _size)
min = length;
else
min = _size;
ret = [_file readIntoBuffer: buffer
length: min];
_size -= ret;
_CRC32 = crc32(_CRC32, buffer, ret);
return ret;
}
@end