/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
* 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 <errno.h>
#import "OFZIPArchive.h"
#import "OFZIPArchiveEntry.h"
#import "OFZIPArchiveEntry+Private.h"
#import "OFDataArray.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFFile.h"
#import "OFDeflateStream.h"
#import "OFDeflate64Stream.h"
#import "OFChecksumFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
#import "OFSeekFailedException.h"
#import "OFUnsupportedVersionException.h"
#define CRC32_MAGIC 0xEDB88320
/*
* FIXME: Current limitations:
* - Split archives are not supported.
* - Write support is missing.
* - The ZIP has to be a file on the local file system.
* - Encrypted files cannot be read.
*/
@interface OFZIPArchive (OF_PRIVATE_CATEGORY)
- (void)OF_readZIPInfo;
- (void)OF_readEntries;
@end
@interface OFZIPArchive_LocalFileHeader: OFObject
{
@public
uint16_t _minVersionNeeded, _generalPurposeBitFlag, _compressionMethod;
uint16_t _lastModifiedFileTime, _lastModifiedFileDate;
uint32_t _CRC32;
uint64_t _compressedSize, _uncompressedSize;
OFString *_fileName;
OFDataArray *_extraField;
}
- initWithFile: (OFFile*)file;
- (bool)matchesEntry: (OFZIPArchiveEntry*)entry;
@end
@interface OFZIPArchive_FileStream: OFStream
{
OFStream *_stream;
OFFile *_file;
OFZIPArchive_LocalFileHeader *_localFileHeader;
bool _hasDataDescriptor;
uint64_t _size;
uint32_t _CRC32;
bool _atEndOfStream;
}
- initWithArchiveFile: (OFString*)path
offset: (of_offset_t)offset
localFileHeader: (OFZIPArchive_LocalFileHeader*)localFileHeader;
@end
uint32_t
of_zip_archive_read_field32(uint8_t **data, uint16_t *size)
{
uint32_t field = 0;
uint_fast8_t i;
if (*size < 4)
@throw [OFInvalidFormatException exception];
for (i = 0; i < 4; i++)
field |= (uint32_t)(*data)[i] << (i * 8);
*data += 4;
*size -= 4;
return field;
}
uint64_t
of_zip_archive_read_field64(uint8_t **data, uint16_t *size)
{
uint64_t field = 0;
uint_fast8_t i;
if (*size < 8)
@throw [OFInvalidFormatException exception];
for (i = 0; i < 8; i++)
field |= (uint64_t)(*data)[i] << (i * 8);
*data += 8;
*size -= 8;
return field;
}
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];
}
- init
{
OF_INVALID_INIT_METHOD
}
- 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];
[_pathToEntryMap release];
[super dealloc];
}
- (void)OF_readZIPInfo
{
void *pool = objc_autoreleasePoolPush();
uint16_t commentLength;
of_offset_t offset = -22;
bool valid = false;
do {
@try {
[_file seekToOffset: offset
whence: SEEK_END];
} @catch (OFSeekFailedException *e) {
if ([e errNo] == EINVAL)
@throw [OFInvalidFormatException exception];
@throw e;
}
if ([_file readLittleEndianInt32] == 0x06054B50) {
valid = true;
break;
}
} while (--offset >= -65557);
if (!valid)
@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];
if (_diskNumber == 0xFFFF ||
_centralDirectoryDisk == 0xFFFF ||
_centralDirectoryEntriesInDisk == 0xFFFF ||
_centralDirectoryEntries == 0xFFFF ||
_centralDirectorySize == 0xFFFFFFFF ||
_centralDirectoryOffset == 0xFFFFFFFF) {
uint64_t offset64, size;
[_file seekToOffset: offset - 20
whence: SEEK_END];
if ([_file readLittleEndianInt32] != 0x07064B50) {
objc_autoreleasePoolPop(pool);
return;
}
/*
* FIXME: Handle number of the disk containing ZIP64 end of
* central directory record.
*/
[_file readLittleEndianInt32];
offset64 = [_file readLittleEndianInt64];
if ((of_offset_t)offset64 != offset64)
@throw [OFOutOfRangeException exception];
[_file seekToOffset: (of_offset_t)offset64
whence: SEEK_SET];
if ([_file readLittleEndianInt32] != 0x06064B50)
@throw [OFInvalidFormatException exception];
size = [_file readLittleEndianInt64];
if (size < 44)
@throw [OFInvalidFormatException exception];
/* version made by */
[_file readLittleEndianInt16];
/* version needed to extract */
[_file readLittleEndianInt16];
_diskNumber = [_file readLittleEndianInt32];
_centralDirectoryDisk = [_file readLittleEndianInt32];
_centralDirectoryEntriesInDisk = [_file readLittleEndianInt64];
_centralDirectoryEntries = [_file readLittleEndianInt64];
_centralDirectorySize = [_file readLittleEndianInt64];
_centralDirectoryOffset = [_file readLittleEndianInt64];
if ((of_offset_t)_centralDirectoryOffset !=
_centralDirectoryOffset)
@throw [OFOutOfRangeException exception];
}
objc_autoreleasePoolPop(pool);
}
- (void)OF_readEntries
{
void *pool = objc_autoreleasePoolPush();
size_t i;
if ((of_offset_t)_centralDirectoryOffset != _centralDirectoryOffset)
@throw [OFOutOfRangeException exception];
[_file seekToOffset: (of_offset_t)_centralDirectoryOffset
whence: SEEK_SET];
_entries = [[OFMutableArray alloc] init];
_pathToEntryMap = [[OFMutableDictionary alloc] init];
for (i = 0; i < _centralDirectoryEntries; i++) {
OFZIPArchiveEntry *entry = [[[OFZIPArchiveEntry alloc]
OF_initWithFile: _file] autorelease];
if ([_pathToEntryMap objectForKey: [entry fileName]] != nil)
@throw [OFInvalidFormatException exception];
[_entries addObject: entry];
[_pathToEntryMap setObject: entry
forKey: [entry fileName]];
}
[_entries makeImmutable];
[_pathToEntryMap makeImmutable];
objc_autoreleasePoolPop(pool);
}
- (OFArray*)entries
{
OF_GETTER(_entries, true)
}
- (OFString*)archiveComment
{
OF_GETTER(_archiveComment, true)
}
- (OFStream*)streamForReadingFile: (OFString*)path
{
OFStream *ret;
void *pool = objc_autoreleasePoolPush();
OFZIPArchiveEntry *entry = [_pathToEntryMap objectForKey: path];
OFZIPArchive_LocalFileHeader *localFileHeader;
uint64_t offset64;
if (entry == nil)
@throw [OFOpenItemFailedException exceptionWithPath: path
mode: @"rb"
errNo: ENOENT];
offset64 = [entry OF_localFileHeaderOffset];
if ((of_offset_t)offset64 != offset64)
@throw [OFOutOfRangeException exception];
[_file seekToOffset: (of_offset_t)offset64
whence: SEEK_SET];
localFileHeader = [[[OFZIPArchive_LocalFileHeader alloc]
initWithFile: _file] autorelease];
if (![localFileHeader matchesEntry: entry])
@throw [OFInvalidFormatException exception];
if ((localFileHeader->_minVersionNeeded & 0xFF) > 45) {
OFString *version = [OFString stringWithFormat: @"%u.%u",
(localFileHeader->_minVersionNeeded & 0xFF) / 10,
(localFileHeader->_minVersionNeeded & 0xFF) % 10];
@throw [OFUnsupportedVersionException
exceptionWithVersion: version];
}
ret = [[OFZIPArchive_FileStream alloc]
initWithArchiveFile: _path
offset: [_file seekToOffset: 0
whence: SEEK_CUR]
localFileHeader: localFileHeader];
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;
uint8_t *ZIP64;
uint16_t ZIP64Size;
if ([file readLittleEndianInt32] != 0x04034B50)
@throw [OFInvalidFormatException exception];
_minVersionNeeded = [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];
of_zip_archive_entry_extra_field_find(_extraField,
OF_ZIP_ARCHIVE_ENTRY_EXTRA_FIELD_ZIP64, &ZIP64, &ZIP64Size);
if (ZIP64 != NULL) {
if (_uncompressedSize == 0xFFFFFFFF)
_uncompressedSize = of_zip_archive_read_field64(
&ZIP64, &ZIP64Size);
if (_compressedSize == 0xFFFFFFFF)
_compressedSize = of_zip_archive_read_field64(
&ZIP64, &ZIP64Size);
if (ZIP64Size > 0)
@throw [OFInvalidFormatException exception];
}
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_fileName release];
[_extraField release];
[super dealloc];
}
- (bool)matchesEntry: (OFZIPArchiveEntry*)entry
{
if (_minVersionNeeded != [entry minVersionNeeded] ||
_generalPurposeBitFlag != [entry OF_generalPurposeBitFlag] ||
_compressionMethod != [entry compressionMethod] ||
_lastModifiedFileTime != [entry OF_lastModifiedFileTime] ||
_lastModifiedFileDate != [entry OF_lastModifiedFileDate])
return false;
if (!(_generalPurposeBitFlag & (1 << 3)))
if (_CRC32 != [entry CRC32] ||
_compressedSize != [entry compressedSize] ||
_uncompressedSize != [entry uncompressedSize])
return false;
if (![_fileName isEqual: [entry fileName]])
return false;
return true;
}
@end
@implementation OFZIPArchive_FileStream
- initWithArchiveFile: (OFString*)path
offset: (of_offset_t)offset
localFileHeader: (OFZIPArchive_LocalFileHeader*)localFileHeader
{
self = [super init];
@try {
_file = [[OFFile alloc] initWithPath: path
mode: @"rb"];
[_file seekToOffset: offset
whence: SEEK_SET];
switch (localFileHeader->_compressionMethod) {
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_NONE:
_stream = [_file retain];
break;
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_DEFLATE:
_stream = [[OFDeflateStream alloc]
initWithStream: _file];
break;
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_DEFLATE64:
_stream = [[OFDeflate64Stream alloc]
initWithStream: _file];
break;
default:
@throw [OFNotImplementedException
exceptionWithSelector: _cmd
object: self];
}
_localFileHeader = [localFileHeader retain];
_hasDataDescriptor = (localFileHeader->_generalPurposeBitFlag &
(1 << 3));
_size = localFileHeader->_uncompressedSize;
_CRC32 = ~0;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_stream release];
[_file release];
[_localFileHeader release];
[super dealloc];
}
- (bool)lowlevelIsAtEndOfStream
{
return _atEndOfStream;
}
- (size_t)lowlevelReadIntoBuffer: (void*)buffer
length: (size_t)length
{
size_t min, ret;
if (_atEndOfStream)
@throw [OFReadFailedException exceptionWithObject: self
requestedLength: length];
if (_hasDataDescriptor) {
if ([_stream isAtEndOfStream]) {
uint32_t CRC32;
_atEndOfStream = true;
CRC32 = [_file readLittleEndianInt32];
if (CRC32 == 0x08074B50)
CRC32 = [_file readLittleEndianInt32];
if (~_CRC32 != CRC32)
@throw [OFChecksumFailedException exception];
/*
* FIXME: Check (un)compressed length!
* (Note: Both are 64 bit if the entry uses ZIP64!)
*/
return 0;
}
ret = [_stream readIntoBuffer: buffer
length: length];
} else {
if (_size == 0) {
_atEndOfStream = true;
if (~_CRC32 != _localFileHeader->_CRC32)
@throw [OFChecksumFailedException exception];
return 0;
}
min = (length < _size ? length : (size_t)_size);
ret = [_stream readIntoBuffer: buffer
length: min];
_size -= ret;
}
_CRC32 = crc32(_CRC32, buffer, ret);
return ret;
}
@end