OFGZIPStream.h

/*
 * 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.
 */

#import "OFStream.h"
#import "OFDate.h"

@class OFInflateStream;

OF_ASSUME_NONNULL_BEGIN

@interface OFGZIPStream: OFStream
{
    OFStream *_stream;
    OFInflateStream *_Nullable _inflateStream;
    enum of_gzip_stream_state {
        OF_GZIP_STREAM_ID1,
        OF_GZIP_STREAM_ID2,
        OF_GZIP_STREAM_COMPRESSION_METHOD,
        OF_GZIP_STREAM_FLAGS,
        OF_GZIP_STREAM_MODIFICATION_TIME,
        OF_GZIP_STREAM_EXTRA_FLAGS,
        OF_GZIP_STREAM_OS,
        OF_GZIP_STREAM_EXTRA_LENGTH,
        OF_GZIP_STREAM_EXTRA,
        OF_GZIP_STREAM_NAME,
        OF_GZIP_STREAM_COMMENT,
        OF_GZIP_STREAM_HEADER_CRC16,
        OF_GZIP_STREAM_DATA,
        OF_GZIP_STREAM_CRC32,
        OF_GZIP_STREAM_UNCOMPRESSED_SIZE
    } _state;
    enum of_gzip_stream_flags {
        OF_GZIP_STREAM_FLAG_TEXT     = 0x01,
        OF_GZIP_STREAM_FLAG_HEADER_CRC16 = 0x02,
        OF_GZIP_STREAM_FLAG_EXTRA    = 0x04,
        OF_GZIP_STREAM_FLAG_NAME     = 0x08,
        OF_GZIP_STREAM_FLAG_COMMENT  = 0x10
    } _flags;
    uint8_t _extraFlags;
    enum of_gzip_stream_os {
        OF_GZIP_STREAM_OS_FAT          =   0,
        OF_GZIP_STREAM_OS_AMIGA        =   1,
        OF_GZIP_STREAM_OS_VMS          =   2,
        OF_GZIP_STREAM_OS_UNIX         =   3,
        OF_GZIP_STREAM_OS_VM_CMS       =   4,
        OF_GZIP_STREAM_OS_ATARI_TOS    =   5,
        OF_GZIP_STREAM_OS_HPFS         =   6,
        OF_GZIP_STREAM_OS_MACINTOSH    =   7,
        OF_GZIP_STREAM_OS_Z_SYSTEM     =   8,
        OF_GZIP_STREAM_OS_CP_M         =   9,
        OF_GZIP_STREAM_OS_TOPS_20      =  10,
        OF_GZIP_STREAM_OS_NTFS         =  11,
        OF_GZIP_STREAM_OS_QDOS         =  12,
        OF_GZIP_STREAM_OS_ACORN_RISCOS =  13,
        OF_GZIP_STREAM_OS_UNKNOWN      = 255
    } _OS;
    size_t _bytesRead;
    uint8_t _buffer[4];
    OFDate *_Nullable _modificationDate;
    uint16_t _extraLength;
    uint32_t _CRC32, _uncompressedSize;
}

+ (instancetype)streamWithStream: (OFStream *)stream;

- init OF_UNAVAILABLE;

- initWithStream: (OFStream *)stream OF_DESIGNATED_INITIALIZER;
@end

OF_ASSUME_NONNULL_END