/*
* Copyright (c) 2008-2022 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.
*/
#import "OFObject.h"
#import "OFKernelEventObserver.h"
#import "OFString.h"
#import "OFTarArchiveEntry.h"
OF_ASSUME_NONNULL_BEGIN
@class OFIRI;
@class OFStream;
/**
* @class OFTarArchive OFTarArchive.h ObjFW/OFTarArchive.h
*
* @brief A class for accessing and manipulating tar archives.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFTarArchive: OFObject
{
OFStream *_stream;
uint_least8_t _mode;
OFStringEncoding _encoding;
OFTarArchiveEntry *_Nullable _currentEntry;
#ifdef OF_TAR_ARCHIVE_M
@public
#endif
OFStream *_Nullable _lastReturnedStream;
}
/**
* @brief The encoding to use for the archive. Defaults to UTF-8.
*/
@property (nonatomic) OFStringEncoding encoding;
/**
* @brief Creates a new OFTarArchive object with the specified stream.
*
* @param stream A stream from which the tar archive will be read.
* For append mode, this needs to be an OFSeekableStream.
* @param mode The mode for the tar file. Valid modes are "r" for reading,
* "w" for creating a new file and "a" for appending to an existing
* archive.
* @return A new, autoreleased OFTarArchive
* @throw OFInvalidFormatException The archive has an invalid format
* @throw OFSeekFailedException The archive was open in append mode and seeking
* failed
*/
+ (instancetype)archiveWithStream: (OFStream *)stream mode: (OFString *)mode;
/**
* @brief Creates a new OFTarArchive object with the specified file.
*
* @param IRI The IRI to the tar archive
* @param mode The mode for the tar file. Valid modes are "r" for reading,
* "w" for creating a new file and "a" for appending to an existing
* archive.
* @return A new, autoreleased OFTarArchive
* @throw OFInvalidFormatException The archive has an invalid format
* @throw OFSeekFailedException The archive was open in append mode and seeking
* failed
*/
+ (instancetype)archiveWithIRI: (OFIRI *)IRI mode: (OFString *)mode;
/**
* @brief Creates an IRI for accessing a the specified file within the
* specified tar archive.
*
* @param path The path of the file within the archive
* @param IRI The IRI of the archive
* @return An IRI for accessing the specified file within the specified tar
* archive
*/
+ (OFIRI *)IRIForFilePath: (OFString *)path inArchiveWithIRI: (OFIRI *)IRI;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initializes an already allocated OFTarArchive object with the
* specified stream.
*
* @param stream A stream from which the tar archive will be read.
* For append mode, this needs to be an OFSeekableStream.
* @param mode The mode for the tar file. Valid modes are "r" for reading,
* "w" for creating a new file and "a" for appending to an existing
* archive.
* @return An initialized OFTarArchive
* @throw OFInvalidFormatException The archive has an invalid format
* @throw OFSeekFailedException The archive was open in append mode and seeking
* failed
*/
- (instancetype)initWithStream: (OFStream *)stream
mode: (OFString *)mode OF_DESIGNATED_INITIALIZER;
/**
* @brief Initializes an already allocated OFTarArchive object with the
* specified file.
*
* @param IRI The IRI to the tar archive
* @param mode The mode for the tar file. Valid modes are "r" for reading,
* "w" for creating a new file and "a" for appending to an existing
* archive.
* @return An initialized OFTarArchive
* @throw OFInvalidFormatException The archive has an invalid format
* @throw OFSeekFailedException The archive was open in append mode and seeking
* failed
*/
- (instancetype)initWithIRI: (OFIRI *)IRI mode: (OFString *)mode;
/**
* @brief Returns the next entry from the tar archive or `nil` if all entries
* have been read.
*
* @note This is only available in read mode.
*
* @warning Calling @ref nextEntry will invalidate all streams returned by
* @ref streamForReadingCurrentEntry or
* @ref streamForWritingEntry:! Reading from or writing to an
* invalidated stream will throw an @ref OFReadFailedException or
* @ref OFWriteFailedException!
*
* @return The next entry from the tar archive or `nil` if all entries have
* been read
* @throw OFInvalidFormatException The archive has an invalid format
*/
- (nullable OFTarArchiveEntry *)nextEntry;
/**
* @brief Returns a stream for reading the current entry.
*
* @note This is only available in read mode.
*
* @note The returned stream conforms to @ref OFReadyForReadingObserving if the
* underlying stream does so, too.
*
* @return A stream for reading the current entry
*/
- (OFStream *)streamForReadingCurrentEntry;
/**
* @brief Returns a stream for writing the specified entry.
*
* @note This is only available in write and append mode.
*
* @note The returned stream conforms to @ref OFReadyForWritingObserving if the
* underlying stream does so, too.
*
* @warning Calling @ref nextEntry will invalidate all streams returned by
* @ref streamForReadingCurrentEntry or
* @ref streamForWritingEntry:! Reading from or writing to an
* invalidated stream will throw an @ref OFReadFailedException or
* @ref OFWriteFailedException!
*
* @param entry The entry for which a stream for writing should be returned
* @return A stream for writing the specified entry
*/
- (OFStream *)streamForWritingEntry: (OFTarArchiveEntry *)entry;
/**
* @brief Closes the OFTarArchive.
*
* @throw OFNotOpenException The archive is not open
*/
- (void)close;
@end
OF_ASSUME_NONNULL_END