/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* 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.
*/
#include "config.h"
#include <errno.h>
#import "OFZIPArchive.h"
#import "OFZIPArchiveEntry.h"
#import "OFZIPArchiveEntry+Private.h"
#import "OFData.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFStream.h"
#import "OFSeekableStream.h"
#ifdef OF_HAVE_FILES
# import "OFFile.h"
#endif
#import "OFInflateStream.h"
#import "OFInflate64Stream.h"
#import "crc32.h"
#import "OFChecksumMismatchException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFNotOpenException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFSeekFailedException.h"
#import "OFTruncatedDataException.h"
#import "OFUnsupportedVersionException.h"
/*
* FIXME: Current limitations:
* - Split archives are not supported.
* - Encrypted files cannot be read.
*/
@interface OFZIPArchive ()
- (void)of_readZIPInfo;
- (void)of_readEntries;
- (void)of_closeLastReturnedStream;
- (void)of_writeCentralDirectory;
@end
@interface OFZIPArchiveLocalFileHeader: OFObject
{
@public
uint16_t _minVersionNeeded, _generalPurposeBitFlag, _compressionMethod;
uint16_t _lastModifiedFileTime, _lastModifiedFileDate;
uint32_t _CRC32;
uint64_t _compressedSize, _uncompressedSize;
OFString *_fileName;
OFData *_extraField;
}
- (instancetype)initWithStream: (OFStream *)stream;
- (bool)matchesEntry: (OFZIPArchiveEntry *)entry;
@end
@interface OFZIPArchiveFileReadStream: OFStream
{
OFStream *_stream, *_decompressedStream;
OFZIPArchiveEntry *_entry;
uint64_t _toRead;
uint32_t _CRC32;
bool _atEndOfStream;
}
- (instancetype)of_initWithStream: (OFStream *)stream
entry: (OFZIPArchiveEntry *)entry;
@end
@interface OFZIPArchiveFileWriteStream: OFStream
{
OFStream *_stream;
uint32_t _CRC32;
@public
int64_t _bytesWritten;
OFMutableZIPArchiveEntry *_entry;
}
- (instancetype)initWithStream: (OFStream *)stream
entry: (OFMutableZIPArchiveEntry *)entry;
@end
uint32_t
of_zip_archive_read_field32(const uint8_t **data, uint16_t *size)
{
uint32_t field = 0;
if (*size < 4)
@throw [OFInvalidFormatException exception];
for (uint8_t 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(const uint8_t **data, uint16_t *size)
{
uint64_t field = 0;
if (*size < 8)
@throw [OFInvalidFormatException exception];
for (uint8_t i = 0; i < 8; i++)
field |= (uint64_t)(*data)[i] << (i * 8);
*data += 8;
*size -= 8;
return field;
}
static void
seekOrThrowInvalidFormat(OFSeekableStream *stream,
of_offset_t offset, int whence)
{
@try {
[stream seekToOffset: offset
whence: whence];
} @catch (OFSeekFailedException *e) {
if (e.errNo == EINVAL)
@throw [OFInvalidFormatException exception];
@throw e;
}
}
@implementation OFZIPArchive
@synthesize archiveComment = _archiveComment;
+ (instancetype)archiveWithStream: (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
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithStream: (OFStream *)stream
mode: (OFString *)mode
{
self = [super init];
@try {
if ([mode isEqual: @"r"])
_mode = OF_ZIP_ARCHIVE_MODE_READ;
else if ([mode isEqual: @"w"])
_mode = OF_ZIP_ARCHIVE_MODE_WRITE;
else if ([mode isEqual: @"a"])
_mode = OF_ZIP_ARCHIVE_MODE_APPEND;
else
@throw [OFInvalidArgumentException exception];
_stream = [stream retain];
_entries = [[OFMutableArray alloc] init];
_pathToEntryMap = [[OFMutableDictionary alloc] init];
if (_mode == OF_ZIP_ARCHIVE_MODE_READ ||
_mode == OF_ZIP_ARCHIVE_MODE_APPEND) {
if (![stream isKindOfClass: [OFSeekableStream class]])
@throw [OFInvalidArgumentException exception];
[self of_readZIPInfo];
[self of_readEntries];
}
if (_mode == OF_ZIP_ARCHIVE_MODE_APPEND) {
_offset = _centralDirectoryOffset;
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
(of_offset_t)_offset, SEEK_SET);
}
} @catch (id e) {
/*
* If we are in write or append mode, we do not want -[close]
* to write anything to it on error - after all, it might not
* be a ZIP file which we would destroy otherwise.
*/
[_stream release];
_stream = nil;
[self release];
@throw e;
}
return self;
}
#ifdef OF_HAVE_FILES
- (instancetype)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];
[_stream release];
[_archiveComment release];
[_entries release];
[_pathToEntryMap release];
[_lastReturnedStream release];
[super dealloc];
}
- (void)of_readZIPInfo
{
void *pool = objc_autoreleasePoolPush();
uint16_t commentLength;
of_offset_t offset = -22;
bool valid = false;
do {
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
offset, SEEK_END);
if ([_stream readLittleEndianInt32] == 0x06054B50) {
valid = true;
break;
}
} while (--offset >= -65557);
if (!valid)
@throw [OFInvalidFormatException exception];
_diskNumber = [_stream readLittleEndianInt16];
_centralDirectoryDisk = [_stream readLittleEndianInt16];
_centralDirectoryEntriesInDisk = [_stream readLittleEndianInt16];
_centralDirectoryEntries = [_stream readLittleEndianInt16];
_centralDirectorySize = [_stream readLittleEndianInt32];
_centralDirectoryOffset = [_stream readLittleEndianInt32];
commentLength = [_stream readLittleEndianInt16];
_archiveComment = [[_stream
readStringWithLength: commentLength
encoding: OF_STRING_ENCODING_CODEPAGE_437] copy];
if (_diskNumber == 0xFFFF ||
_centralDirectoryDisk == 0xFFFF ||
_centralDirectoryEntriesInDisk == 0xFFFF ||
_centralDirectoryEntries == 0xFFFF ||
_centralDirectorySize == 0xFFFFFFFF ||
_centralDirectoryOffset == 0xFFFFFFFF) {
int64_t offset64;
uint64_t size;
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
offset - 20, SEEK_END);
if ([_stream readLittleEndianInt32] != 0x07064B50) {
objc_autoreleasePoolPop(pool);
return;
}
/*
* FIXME: Handle number of the disk containing ZIP64 end of
* central directory record.
*/
[_stream readLittleEndianInt32];
offset64 = [_stream readLittleEndianInt64];
if (offset64 < 0 || (of_offset_t)offset64 != offset64)
@throw [OFOutOfRangeException exception];
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
(of_offset_t)offset64, SEEK_SET);
if ([_stream readLittleEndianInt32] != 0x06064B50)
@throw [OFInvalidFormatException exception];
size = [_stream readLittleEndianInt64];
if (size < 44)
@throw [OFInvalidFormatException exception];
/* version made by */
[_stream readLittleEndianInt16];
/* version needed to extract */
[_stream readLittleEndianInt16];
_diskNumber = [_stream readLittleEndianInt32];
_centralDirectoryDisk = [_stream readLittleEndianInt32];
_centralDirectoryEntriesInDisk =
[_stream readLittleEndianInt64];
_centralDirectoryEntries = [_stream readLittleEndianInt64];
_centralDirectorySize = [_stream readLittleEndianInt64];
_centralDirectoryOffset = [_stream readLittleEndianInt64];
if (_centralDirectoryOffset < 0 ||
(of_offset_t)_centralDirectoryOffset !=
_centralDirectoryOffset)
@throw [OFOutOfRangeException exception];
}
objc_autoreleasePoolPop(pool);
}
- (void)of_readEntries
{
void *pool = objc_autoreleasePoolPush();
if (_centralDirectoryOffset < 0 ||
(of_offset_t)_centralDirectoryOffset != _centralDirectoryOffset)
@throw [OFOutOfRangeException exception];
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
(of_offset_t)_centralDirectoryOffset, SEEK_SET);
for (size_t i = 0; i < _centralDirectoryEntries; i++) {
OFZIPArchiveEntry *entry = [[[OFZIPArchiveEntry alloc]
of_initWithStream: _stream] autorelease];
if ([_pathToEntryMap objectForKey: entry.fileName] != nil)
@throw [OFInvalidFormatException exception];
[_entries addObject: entry];
[_pathToEntryMap setObject: entry
forKey: entry.fileName];
}
objc_autoreleasePoolPop(pool);
}
- (OFArray *)entries
{
return [[_entries copy] autorelease];
}
- (OFString *)archiveComment
{
return _archiveComment;
}
- (void)setArchiveComment: (OFString *)comment
{
void *pool = objc_autoreleasePoolPush();
OFString *old;
if (comment.UTF8StringLength > UINT16_MAX)
@throw [OFOutOfRangeException exception];
old = _archiveComment;
_archiveComment = [comment copy];
[old release];
objc_autoreleasePoolPop(pool);
}
- (void)of_closeLastReturnedStream
{
[_lastReturnedStream close];
if ((_mode == OF_ZIP_ARCHIVE_MODE_WRITE ||
_mode == OF_ZIP_ARCHIVE_MODE_APPEND) &&
[_lastReturnedStream isKindOfClass:
[OFZIPArchiveFileWriteStream class]]) {
OFZIPArchiveFileWriteStream *stream =
(OFZIPArchiveFileWriteStream *)_lastReturnedStream;
if (INT64_MAX - _offset < stream->_bytesWritten)
@throw [OFOutOfRangeException exception];
_offset += stream->_bytesWritten;
if (stream->_entry != nil) {
[_entries addObject: stream->_entry];
[_pathToEntryMap setObject: stream->_entry
forKey: [stream->_entry fileName]];
}
}
[_lastReturnedStream release];
_lastReturnedStream = nil;
}
- (OFStream *)streamForReadingFile: (OFString *)path
{
void *pool = objc_autoreleasePoolPush();
OFZIPArchiveEntry *entry;
OFZIPArchiveLocalFileHeader *localFileHeader;
int64_t offset64;
if (_mode != OF_ZIP_ARCHIVE_MODE_READ)
@throw [OFInvalidArgumentException exception];
if ((entry = [_pathToEntryMap objectForKey: path]) == nil)
@throw [OFOpenItemFailedException exceptionWithPath: path
mode: @"r"
errNo: ENOENT];
[self of_closeLastReturnedStream];
offset64 = entry.of_localFileHeaderOffset;
if (offset64 < 0 || (of_offset_t)offset64 != offset64)
@throw [OFOutOfRangeException exception];
seekOrThrowInvalidFormat((OFSeekableStream *)_stream,
(of_offset_t)offset64, SEEK_SET);
localFileHeader = [[[OFZIPArchiveLocalFileHeader alloc]
initWithStream: _stream] 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];
}
_lastReturnedStream = [[OFZIPArchiveFileReadStream alloc]
of_initWithStream: _stream
entry: entry];
objc_autoreleasePoolPop(pool);
return [[_lastReturnedStream retain] autorelease];
}
- (OFStream *)streamForWritingEntry: (OFZIPArchiveEntry *)entry_
{
/* TODO: Avoid data descriptor when _stream is an OFSeekableStream */
int64_t offsetAdd = 0;
void *pool;
OFMutableZIPArchiveEntry *entry;
OFString *fileName;
OFData *extraField;
uint16_t fileNameLength, extraFieldLength;
if (_mode != OF_ZIP_ARCHIVE_MODE_WRITE &&
_mode != OF_ZIP_ARCHIVE_MODE_APPEND)
@throw [OFInvalidArgumentException exception];
pool = objc_autoreleasePoolPush();
entry = [[entry_ mutableCopy] autorelease];
if ([_pathToEntryMap objectForKey: entry.fileName] != nil)
@throw [OFOpenItemFailedException
exceptionWithPath: entry.fileName
mode: @"w"
errNo: EEXIST];
if (entry.compressionMethod !=
OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_NONE)
@throw [OFNotImplementedException exceptionWithSelector: _cmd
object: self];
[self of_closeLastReturnedStream];
fileName = entry.fileName;
fileNameLength = fileName.UTF8StringLength;
extraField = entry.extraField;
extraFieldLength = extraField.count;
if (UINT16_MAX - extraFieldLength < 20)
@throw [OFOutOfRangeException exception];
entry.versionMadeBy = (entry.versionMadeBy & 0xFF00) | 45;
entry.minVersionNeeded = (entry.minVersionNeeded & 0xFF00) | 45;
entry.compressedSize = 0;
entry.uncompressedSize = 0;
entry.CRC32 = 0;
entry.generalPurposeBitFlag |= (1u << 3) | (1u << 11);
entry.of_localFileHeaderOffset = _offset;
[_stream writeLittleEndianInt32: 0x04034B50];
[_stream writeLittleEndianInt16: entry.minVersionNeeded];
[_stream writeLittleEndianInt16: entry.generalPurposeBitFlag];
[_stream writeLittleEndianInt16: entry.compressionMethod];
[_stream writeLittleEndianInt16: entry.of_lastModifiedFileTime];
[_stream writeLittleEndianInt16: entry.of_lastModifiedFileDate];
/* We use the data descriptor */
[_stream writeLittleEndianInt32: 0];
/* We use ZIP64 */
[_stream writeLittleEndianInt32: 0xFFFFFFFF];
[_stream writeLittleEndianInt32: 0xFFFFFFFF];
[_stream writeLittleEndianInt16: fileNameLength];
[_stream writeLittleEndianInt16: extraFieldLength + 20];
offsetAdd += 4 + (5 * 2) + (3 * 4) + (2 * 2);
[_stream writeString: fileName];
offsetAdd += fileNameLength;
[_stream writeLittleEndianInt16:
OF_ZIP_ARCHIVE_ENTRY_EXTRA_FIELD_ZIP64];
[_stream writeLittleEndianInt16: 16];
/* We use the data descriptor */
[_stream writeLittleEndianInt64: 0];
[_stream writeLittleEndianInt64: 0];
offsetAdd += (2 * 2) + (2 * 8);
if (extraField != nil)
[_stream writeData: extraField];
offsetAdd += extraFieldLength;
if (INT64_MAX - _offset < offsetAdd)
@throw [OFOutOfRangeException exception];
_offset += offsetAdd;
_lastReturnedStream = [[OFZIPArchiveFileWriteStream alloc]
initWithStream: _stream
entry: entry];
objc_autoreleasePoolPop(pool);
return [[_lastReturnedStream retain] autorelease];
}
- (void)of_writeCentralDirectory
{
void *pool = objc_autoreleasePoolPush();
_centralDirectoryEntries = 0;
_centralDirectoryEntriesInDisk = 0;
_centralDirectorySize = 0;
_centralDirectoryOffset = _offset;
for (OFZIPArchiveEntry *entry in _entries) {
_centralDirectorySize += [entry of_writeToStream: _stream];
_centralDirectoryEntries++;
_centralDirectoryEntriesInDisk++;
}
/* ZIP64 end of central directory */
[_stream writeLittleEndianInt32: 0x06064B50];
[_stream writeLittleEndianInt64: 44]; /* Remaining size */
[_stream writeLittleEndianInt16: 45]; /* Version made by */
[_stream writeLittleEndianInt16: 45]; /* Version required */
[_stream writeLittleEndianInt32: _diskNumber];
[_stream writeLittleEndianInt32: _centralDirectoryDisk];
[_stream writeLittleEndianInt64: _centralDirectoryEntriesInDisk];
[_stream writeLittleEndianInt64: _centralDirectoryEntries];
[_stream writeLittleEndianInt64: _centralDirectorySize];
[_stream writeLittleEndianInt64: _centralDirectoryOffset];
/* ZIP64 end of central directory locator */
[_stream writeLittleEndianInt32: 0x07064B50];
[_stream writeLittleEndianInt32: _diskNumber];
[_stream writeLittleEndianInt64:
_centralDirectoryOffset + _centralDirectorySize];
[_stream writeLittleEndianInt32: 1]; /* Total number of disks */
/* End of central directory */
[_stream writeLittleEndianInt32: 0x06054B50];
[_stream writeLittleEndianInt16: 0xFFFF]; /* Disk number */
[_stream writeLittleEndianInt16: 0xFFFF]; /* CD disk */
[_stream writeLittleEndianInt16: 0xFFFF]; /* CD entries in disk */
[_stream writeLittleEndianInt16: 0xFFFF]; /* CD entries */
[_stream writeLittleEndianInt32: 0xFFFFFFFF]; /* CD size */
[_stream writeLittleEndianInt32: 0xFFFFFFFF]; /* CD offset */
[_stream writeLittleEndianInt16: _archiveComment.UTF8StringLength];
if (_archiveComment != nil)
[_stream writeString: _archiveComment];
objc_autoreleasePoolPop(pool);
}
- (void)close
{
if (_stream == nil)
return;
[self of_closeLastReturnedStream];
if (_mode == OF_ZIP_ARCHIVE_MODE_WRITE ||
_mode == OF_ZIP_ARCHIVE_MODE_APPEND)
[self of_writeCentralDirectory];
[_stream release];
_stream = nil;
}
@end
@implementation OFZIPArchiveLocalFileHeader
- (instancetype)initWithStream: (OFStream *)stream
{
self = [super init];
@try {
void *pool = objc_autoreleasePoolPush();
OFMutableData *extraField = nil;
uint16_t fileNameLength, extraFieldLength;
of_string_encoding_t encoding;
size_t ZIP64Index;
uint16_t ZIP64Size;
if ([stream readLittleEndianInt32] != 0x04034B50)
@throw [OFInvalidFormatException exception];
_minVersionNeeded = [stream readLittleEndianInt16];
_generalPurposeBitFlag = [stream readLittleEndianInt16];
_compressionMethod = [stream readLittleEndianInt16];
_lastModifiedFileTime = [stream readLittleEndianInt16];
_lastModifiedFileDate = [stream readLittleEndianInt16];
_CRC32 = [stream readLittleEndianInt32];
_compressedSize = [stream readLittleEndianInt32];
_uncompressedSize = [stream readLittleEndianInt32];
fileNameLength = [stream readLittleEndianInt16];
extraFieldLength = [stream readLittleEndianInt16];
encoding = (_generalPurposeBitFlag & (1u << 11)
? OF_STRING_ENCODING_UTF_8
: OF_STRING_ENCODING_CODEPAGE_437);
_fileName = [[stream readStringWithLength: fileNameLength
encoding: encoding] copy];
if (extraFieldLength > 0)
extraField = [[[stream readDataWithCount:
extraFieldLength] mutableCopy] autorelease];
ZIP64Index = of_zip_archive_entry_extra_field_find(extraField,
OF_ZIP_ARCHIVE_ENTRY_EXTRA_FIELD_ZIP64, &ZIP64Size);
if (ZIP64Index != OF_NOT_FOUND) {
const uint8_t *ZIP64 =
[extraField itemAtIndex: ZIP64Index];
of_range_t range =
of_range(ZIP64Index - 4, ZIP64Size + 4);
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];
[extraField removeItemsInRange: range];
}
if (extraField.count > 0) {
[extraField makeImmutable];
_extraField = [extraField copy];
}
objc_autoreleasePoolPop(pool);
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_fileName release];
[_extraField release];
[super dealloc];
}
- (bool)matchesEntry: (OFZIPArchiveEntry *)entry
{
if (_compressionMethod != entry.compressionMethod ||
_lastModifiedFileTime != entry.of_lastModifiedFileTime ||
_lastModifiedFileDate != entry.of_lastModifiedFileDate)
return false;
if (!(_generalPurposeBitFlag & (1u << 3)))
if (_CRC32 != entry.CRC32 ||
_compressedSize != entry.compressedSize ||
_uncompressedSize != entry.uncompressedSize)
return false;
if (![_fileName isEqual: entry.fileName])
return false;
return true;
}
@end
@implementation OFZIPArchiveFileReadStream
- (instancetype)of_initWithStream: (OFStream *)stream
entry: (OFZIPArchiveEntry *)entry
{
self = [super init];
@try {
_stream = [stream retain];
switch (entry.compressionMethod) {
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_NONE:
_decompressedStream = [stream retain];
break;
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_DEFLATE:
_decompressedStream = [[OFInflateStream alloc]
initWithStream: stream];
break;
case OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_DEFLATE64:
_decompressedStream = [[OFInflate64Stream alloc]
initWithStream: stream];
break;
default:
@throw [OFNotImplementedException
exceptionWithSelector: _cmd
object: nil];
}
_entry = [entry copy];
_toRead = entry.uncompressedSize;
_CRC32 = ~0;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[self close];
[_stream release];
[_decompressedStream release];
[_entry 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.atEndOfStream && !_decompressedStream.hasDataInReadBuffer)
@throw [OFTruncatedDataException exception];
#if SIZE_MAX >= UINT64_MAX
if (length > UINT64_MAX)
@throw [OFOutOfRangeException exception];
#endif
if ((uint64_t)length > _toRead)
length = (size_t)_toRead;
ret = [_decompressedStream readIntoBuffer: buffer
length: length];
_toRead -= ret;
_CRC32 = of_crc32(_CRC32, buffer, ret);
if (_toRead == 0) {
_atEndOfStream = true;
if (~_CRC32 != _entry.CRC32) {
OFString *actualChecksum = [OFString stringWithFormat:
@"%08" PRIX32, ~_CRC32];
OFString *expectedChecksum = [OFString stringWithFormat:
@"%08" PRIX32, _entry.CRC32];
@throw [OFChecksumMismatchException
exceptionWithActualChecksum: actualChecksum
expectedChecksum: expectedChecksum];
}
}
return ret;
}
- (bool)hasDataInReadBuffer
{
return (super.hasDataInReadBuffer ||
_decompressedStream.hasDataInReadBuffer);
}
- (int)fileDescriptorForReading
{
return ((id <OFReadyForReadingObserving>)_decompressedStream)
.fileDescriptorForReading;
}
- (void)close
{
[_stream release];
_stream = nil;
[_decompressedStream release];
_decompressedStream = nil;
[super close];
}
@end
@implementation OFZIPArchiveFileWriteStream
- (instancetype)initWithStream: (OFStream *)stream
entry: (OFMutableZIPArchiveEntry *)entry
{
self = [super init];
_stream = [stream retain];
_entry = [entry retain];
_CRC32 = ~0;
return self;
}
- (void)dealloc
{
[self close];
[_stream release];
[_entry release];
[super dealloc];
}
- (size_t)lowlevelWriteBuffer: (const void *)buffer
length: (size_t)length
{
size_t bytesWritten;
#if SIZE_MAX >= INT64_MAX
if (length > INT64_MAX)
@throw [OFOutOfRangeException exception];
#endif
if (INT64_MAX - _bytesWritten < (int64_t)length)
@throw [OFOutOfRangeException exception];
bytesWritten = [_stream writeBuffer: buffer
length: length];
_bytesWritten += (int64_t)bytesWritten;
_CRC32 = of_crc32(_CRC32, buffer, length);
return bytesWritten;
}
- (void)close
{
if (_stream == nil)
return;
[_stream writeLittleEndianInt32: 0x08074B50];
[_stream writeLittleEndianInt32: _CRC32];
[_stream writeLittleEndianInt64: _bytesWritten];
[_stream writeLittleEndianInt64: _bytesWritten];
[_stream release];
_stream = nil;
_entry.CRC32 = ~_CRC32;
_entry.compressedSize = _bytesWritten;
_entry.uncompressedSize = _bytesWritten;
[_entry makeImmutable];
_bytesWritten += (2 * 4 + 2 * 8);
}
@end