/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#import "OFStream.h"
#import "OFDate.h"
@class OFInflateStream;
OF_ASSUME_NONNULL_BEGIN
/**
* @brief The operating system on which compressed the data.
*/
typedef enum {
OFGZIPStreamOperatingSystemFAT = 0,
OFGZIPStreamOperatingSystemAmiga = 1,
OFGZIPStreamOperatingSystemVMS = 2,
OFGZIPStreamOperatingSystemUNIX = 3,
OFGZIPStreamOperatingSystemVM_CMS = 4,
OFGZIPStreamOperatingSystemAtariTOS = 5,
OFGZIPStreamOperatingSystemHPFS = 6,
OFGZIPStreamOperatingSystemMacintosh = 7,
OFGZIPStreamOperatingSystemZSystem = 8,
OFGZIPStreamOperatingSystemCPM = 9,
OFGZIPStreamOperatingSystemTOPS20 = 10,
OFGZIPStreamOperatingSystemNTFS = 11,
OFGZIPStreamOperatingSystemQDO = 12,
OFGZIPStreamOperatingSystemAcornRISCOS = 13,
OFGZIPStreamOperatingSystemUnknown = 255
} OFGZIPStreamOperatingSystem;
/**
* @class OFGZIPStream OFGZIPStream.h ObjFW/OFGZIPStream.h
*
* @brief A class that handles GZIP compression and decompression transparently
* for an underlying stream.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFGZIPStream: OFStream
{
OFStream *_stream;
OFInflateStream *_Nullable _inflateStream;
enum {
OFGZIPStreamStateID1,
OFGZIPStreamStateID2,
OFGZIPStreamStateCompressionMethod,
OFGZIPStreamStateFlags,
OFGZIPStreamStateModificationDate,
OFGZIPStreamStateExtraFlags,
OFGZIPStreamStateOperatingSystem,
OFGZIPStreamStateExtraLength,
OFGZIPStreamStateExtra,
OFGZIPStreamStateName,
OFGZIPStreamStateComment,
OFGZIPStreamStateHeaderCRC16,
OFGZIPStreamStateData,
OFGZIPStreamStateCRC32,
OFGZIPStreamStateUncompressedSize
} _state;
enum {
OFGZIPStreamFlagText = 0x01,
OFGZIPStreamFlagHeaderCRC16 = 0x02,
OFGZIPStreamFlagExtra = 0x04,
OFGZIPStreamFlagName = 0x08,
OFGZIPStreamFlagComment = 0x10
} _flags;
uint8_t _extraFlags;
OFGZIPStreamOperatingSystem _operatingSystemMadeOn;
size_t _bytesRead;
uint8_t _buffer[4];
OFDate *_Nullable _modificationDate;
uint16_t _extraLength;
uint32_t _CRC32, _uncompressedSize;
}
/**
* @brief The operating system on which the data was compressed.
*
* This property is only guaranteed to be available once @ref atEndOfStream is
* true.
*/
@property (readonly, nonatomic)
OFGZIPStreamOperatingSystem operatingSystemMadeOn;
/**
* @brief The modification date of the original file.
*
* This property is only guaranteed to be available once @ref atEndOfStream is
* true.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFDate *modificationDate;
/**
* @brief Creates a new OFGZIPStream with the specified underlying stream.
*
* @param stream The underlying stream for the OFGZIPStream
* @param mode The mode for the OFGZIPStream. Valid modes are "r" for reading
* and "w" for writing.
* @return A new, autoreleased OFGZIPStream
*/
+ (instancetype)streamWithStream: (OFStream *)stream mode: (OFString *)mode;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initializes an already allocated OFGZIPStream with the specified
* underlying stream.
*
* @param stream The underlying stream for the OFGZIPStream
* @param mode The mode for the OFGZIPStream. Valid modes are "r" for reading
* and "w" for writing.
* @return An initialized OFGZIPStream
*/
- (instancetype)initWithStream: (OFStream *)stream
mode: (OFString *)mode OF_DESIGNATED_INITIALIZER;
@end
OF_ASSUME_NONNULL_END