ObjFW  OFStream.h at [8c45d72a13]

File src/OFStream.h artifact 576cb8fb89 part of check-in 8c45d72a13


/*
 * Copyright (c) 2008, 2009, 2010, 2011
 *   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 <stdarg.h>

#import "OFObject.h"
#import "OFString.h"

@class OFDataArray;

/**
 * \brief A base class for different types of streams.
 *
 * IMPORTANT: If you want to subclass this, override _readNBytes:intoBuffer:,
 * _writeNBytes:fromBuffer: and _isAtEndOfStream, but nothing else. Those are
 * not defined in the headers, but do the actual work. OFStream uses those and
 * does all the caching and other stuff. If you override these methods without
 * the _ prefix, you *WILL* break caching and get broken results!
 */
@interface OFStream: OFObject
{
	char   *cache;
	char   *writeBuffer;
	size_t cacheLength, writeBufferLength;
	BOOL   buffersWrites;
	BOOL   isBlocking;
}

#ifdef OF_HAVE_PROPERTIES
@property (assign, setter=setBlocking:) BOOL isBlocking;
#endif

/**
 * Returns a boolean whether the end of the stream has been reached.
 *
 * \return A boolean whether the end of the stream has been reached
 */
- (BOOL)isAtEndOfStream;

/**
 * Reads at most size bytes from the stream into a buffer.
 *
 * \param buffer The buffer into which the data is read
 * \param length The length of the data that should be read at most.
 *		 The buffer MUST be at least this big!
 * \return The number of bytes read
 */
- (size_t)readNBytes: (size_t)size
	  intoBuffer: (char*)buffer;

/**
 * Reads exactly length bytes from the stream into a buffer. Unlike
 * readNBytes:intoBuffer:, this method does not return when less than the
 * specified length has been read - instead, it waits until it got exactly length
 * bytes.
 *
 * WARNING: Only call this when you know that specified amount of data is
 *	    available! Otherwise you will get an exception!
 *
 * \param buffer The buffer into which the data is read
 * \param length The length of the data that should be read.
 *	       The buffer MUST be EXACTLY this big!
 */
- (void)readExactlyNBytes: (size_t)length
	       intoBuffer: (char*)buffer;

/**
 * Reads a uint8_t from the stream.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint8_t from the stream
 */
- (uint8_t)readInt8;

/**
 * Reads a uint16_t from the stream which is encoded in big endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint16_t from the stream in native endianess
 */
- (uint16_t)readBigEndianInt16;

/**
 * Reads a uint32_t from the stream which is encoded in big endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint32_t from the stream in the native endianess
 */
- (uint32_t)readBigEndianInt32;

/**
 * Reads a uint64_t from the stream which is encoded in big endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint64_t from the stream in the native endianess
 */
- (uint64_t)readBigEndianInt64;

/**
 * Reads a uint16_t from the stream which is encoded in little endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint16_t from the stream in native endianess
 */
- (uint16_t)readLittleEndianInt16;

/**
 * Reads a uint32_t from the stream which is encoded in little endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint32_t from the stream in the native endianess
 */
- (uint32_t)readLittleEndianInt32;

/**
 * Reads a uint64_t from the stream which is encoded in little endian.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \return A uint64_t from the stream in the native endianess
 */
- (uint64_t)readLittleEndianInt64;

/**
 * Reads nItems items with an item size of 1 from the stream and returns them
 * in an OFDataArray.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nItems The number of items to read
 * \return An OFDataArray with at nItems items.
 */
- (OFDataArray*)readDataArrayWithNItems: (size_t)nItems;

/**
 * Reads nItems items with the specified item size from the stream and returns
 * them in an OFDataArray.
 *
 * WARNING: Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param itemSize The size of each item
 * \param nItems The number of items to read
 * \return An OFDataArray with at nItems items.
 */
- (OFDataArray*)readDataArrayWithItemSize: (size_t)itemSize
				andNItems: (size_t)nItems;

/**
 * \return An OFDataArray with an item size of 1 with all the data of the
 *	   stream until the end of the stream is reached.
 */
- (OFDataArray*)readDataArrayTillEndOfStream;

/**
 * Read until a newline, \\0 or end of stream occurs.
 *
 * \return The line that was read, autoreleased, or nil if the end of the
 *	   stream has been reached.
 */
- (OFString*)readLine;

/**
 * Read with the specified encoding until a newline, \\0 or end of stream
 * occurs.
 *
 * \param encoding The encoding used by the stream
 * \return The line that was read, autoreleased, or nil if the end of the
 *	   stream has been reached.
 */
- (OFString*)readLineWithEncoding: (of_string_encoding_t)encoding;

/**
 * Read until the specified string or \\0 is found or the end of stream occurs.
 *
 * \param delimiter The delimiter
 * \return The line that was read, autoreleased, or nil if the end of the
 *	   stream has been reached.
 */
- (OFString*)readTillDelimiter: (OFString*)delimiter;

/**
 * Read until the specified string or \\0 is found or the end of stream occurs.
 *
 * \param delimiter The delimiter
 * \param encoding The encoding used by the stream
 * \return The line that was read, autoreleased, or nil if the end of the
 *	   stream has been reached.
 */
- (OFString*)readTillDelimiter: (OFString*)delimiter
		  withEncoding: (of_string_encoding_t)encoding;

/**
 * \return A boolean whether writes are buffered
 */
- (BOOL)buffersWrites;

/**
 * Enables or disables the write buffer.
 *
 * \param enable Whether the write buffer should be enabled or disabled
 */
- (void)setBuffersWrites: (BOOL)enable;

/**
 * Writes everythig in the write buffer to the stream.
 */
- (void)flushWriteBuffer;

/**
 * Writes from a buffer into the stream.
 *
 * \param buffer The buffer from which the data is written to the stream
 * \param length The length of the data that should be written
 * \return The number of bytes written
 */
- (size_t)writeNBytes: (size_t)length
	   fromBuffer: (const char*)buffer;

/**
 * Writes a uint8_t into the stream.
 *
 * \param int8 A uint8_t
 */
- (void)writeInt8: (uint8_t)int8;

/**
 * Writes a uint16_t into the stream, encoded in big endian.
 *
 * \param int16 A uint16_t
 */
- (void)writeBigEndianInt16: (uint16_t)int16;

/**
 * Writes a uint32_t into the stream, encoded in big endian.
 *
 * \param int32 A uint32_t
 */
- (void)writeBigEndianInt32: (uint32_t)int32;

/**
 * Writes a uint64_t into the stream, encoded in big endian.
 *
 * \param int64 A uint64_t
 */
- (void)writeBigEndianInt64: (uint64_t)int64;

/**
 * Writes a uint16_t into the stream, encoded in little endian.
 *
 * \param int16 A uint16_t
 */
- (void)writeLittleEndianInt16: (uint16_t)int16;

/**
 * Writes a uint32_t into the stream, encoded in little endian.
 *
 * \param int32 A uint32_t
 */
- (void)writeLittleEndianInt32: (uint32_t)int32;

/**
 * Writes a uint64_t into the stream, encoded in little endian.
 *
 * \param int64 A uint64_t
 */
- (void)writeLittleEndianInt64: (uint64_t)int64;

/**
 * Writes from an OFDataArray into the stream.
 *
 * \param dataArray The OFDataArray to write into the stream
 * \return The number of bytes written
 */
- (size_t)writeDataArray: (OFDataArray*)dataArray;

/**
 * Writes a string into the stream, without the trailing zero.
 *
 * \param string The string from which the data is written to the stream
 * \return The number of bytes written
 */
- (size_t)writeString: (OFString*)string;

/**
 * Writes a string into the stream with a trailing newline.
 *
 * \param string The string from which the data is written to the stream
 * \return The number of bytes written
 */
- (size_t)writeLine: (OFString*)string;

/**
 * Writes a formatted string into the stream.
 *
 * \param format A string used as format
 * \return The number of bytes written
 */
- (size_t)writeFormat: (OFString*)format, ...;

/**
 * Writes a formatted string into the stream.
 *
 * \param format A string used as format
 * \param arguments The arguments used in the format string
 * \return The number of bytes written
 */
- (size_t)writeFormat: (OFString*)format
	withArguments: (va_list)arguments;

/**
 * \return The number of bytes still present in the internal cache.
 */
- (size_t)pendingBytes;

/**
 * \return Whether the stream is in blocking mode
 */
- (BOOL)isBlocking;

/**
 * Enables or disables non-blocking I/O.
 *
 * By default, a stream is in blocking mode.
 * On Win32, this currently only works for sockets!
 *
 * \param enable Whether the stream should be blocking
 */
- (void)setBlocking: (BOOL)enable;

/**
 * \return The file descriptor for the stream.
 */
- (int)fileDescriptor;

/**
 * Closes the stream.
 */
- (void)close;
@end