ObjFW  Diff

@class OFDataArray;

/**
 * \brief A base class for different types of streams.
 *
 * \warning Even though the OFCopying protocol is implemented, it does
 *	    <i>not</i> return an independent copy of the stream but instead
 *	    retains it.  This is so that the stream can be used as a key for a
 *	    dictionary, so context can be associated with a stream. Using a
 *	    stream in more than one thread at the same time is not thread-safe,
 *	    even if copy was called to create one "instance" for every thread!
 *
 * \warning If you want to subclass this, override _readIntoBuffer:length:,
 *	    _writeBuffer:length: and _isAtEndOfStream, but nothing else, as
 *	    those are are the methods that do the actual work. OFStream uses
 *	    those for all other methods and does all the caching and other
 *	    stuff for you. If you override these methods without the _ prefix,
 *	    you <i>will</i> break caching and get broken results!
 */
@interface OFStream: OFObject <OFCopying>
{
	char   *cache;
	char   *writeBuffer;
	size_t cacheLength, writeBufferLength;
	BOOL   writeBufferEnabled;
	BOOL   blocking;
	BOOL   waitingForDelimiter;
}

#ifdef OF_HAVE_PROPERTIES
@property (getter=isBlocking) BOOL blocking;
@property (readonly, getter=isAtEndOfStream) BOOL atEndOfStream;

- (BOOL)isAtEndOfStream;

/**
 * \brief Reads <i>at most</i> size bytes from the stream into a buffer.
 *
 * On network streams, this might read less than the specified number of bytes.
 * If you want to read exactly the specified number of bytes, use
 * -[readIntoBuffer:exactLength:].
 *
 * \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 <i>must</i> be at least this big!
 * \return The number of bytes read
 */

- (size_t)readIntoBuffer: (void*)buffer
		  length: (size_t)size;

/**
 * \brief Reads exactly the specified length bytes from the stream into a
 *	  buffer.
 *
 * Unlike readIntoBuffer:length:, this method does not return when less than the
 * specified length has been read - instead, it waits until it got exactly the
 * specified length.
 *
 * \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 <i>must</i> be <i>exactly</i> this big!
 */

 - (void)readIntoBuffer: (void*)buffer
	    exactLength: (size_t)length;

/**
 * \brief 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!
 *

 *	    Otherwise you will get an exception!
 *
 * \param nInt16s The number of uint16_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint16_ts
 * \return The number of bytes read
 */

- (size_t)readBigEndianInt16sIntoBuffer: (uint16_t*)buffer
				  count: (size_t)nInt16s;

/**
 * \brief Reads the specified number of uint32_ts from the stream which are
 *	  encoded in big endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nInt32s The number of uint32_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint32_ts
 * \return The number of bytes read
 */

- (size_t)readBigEndianInt32sIntoBuffer: (uint32_t*)buffer
				  count: (size_t)nInt32s;

/**
 * \brief Reads the specified number of uint64_ts from the stream which are
 *	  encoded in big endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nInt64s The number of uint64_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint64_ts
 * \return The number of bytes read
 */

- (size_t)readBigEndianInt64sIntoBuffer: (uint64_t*)buffer
				  count: (size_t)nInt64s;

/**
 * \brief Reads the specified number of floats from the stream which are encoded
 *	  in big endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nFloatss The number of floats to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 floats
 * \return The number of bytes read
 */

- (size_t)readBigEndianFloatsIntoBuffer: (float*)buffer
				  count: (size_t)nFloats;

/**
 * \brief Reads the specified number of doubles from the stream which are
 *	  encoded in big endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nDoubles The number of doubles to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 doubles
 * \return The number of bytes read
 */

- (size_t)readBigEndianDoublesIntoBuffer: (double*)buffer
				   count: (size_t)nDoubles;

/**
 * \brief 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!
 *

 *	    Otherwise you will get an exception!
 *
 * \param nInt16s The number of uint16_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint16_ts
 * \return The number of bytes read
 */

- (size_t)readLittleEndianInt16sIntoBuffer: (uint16_t*)buffer
				     count: (size_t)nInt16s;

/**
 * \brief Reads the specified number of uint32_ts from the stream which are
 *	  encoded in little endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nInt32s The number of uint32_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint32_ts
 * \return The number of bytes read
 */

- (size_t)readLittleEndianInt32sIntoBuffer: (uint32_t*)buffer
				     count: (size_t)nInt32s;

/**
 * \brief Reads the specified number of uint64_ts from the stream which are
 *	  encoded in little endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nInt64s The number of uint64_ts to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 uint64_ts
 * \return The number of bytes read
 */

- (size_t)readLittleEndianInt64sIntoBuffer: (uint64_t*)buffer
				     count: (size_t)nInt64s;

/**
 * \brief Reads the specified number of floats from the stream which are
 *	  encoded in little endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nFloats The number of floats to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 floats
 * \return The number of bytes read
 */

- (size_t)readLittleEndianFloatsIntoBuffer: (float*)buffer
				     count: (size_t)nFloats;

/**
 * \brief Reads the specified number of doubles from the stream which are
 *	  encoded in little endian.
 *
 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param nDoubles The number of doubles to read
 * \param buffer A buffer of sufficient size to store the specified number of
 *		 doubles
 * \return The number of bytes read
 */

- (size_t)readLittleEndianDoublesIntoBuffer: (double*)buffer
				      count: (size_t)nDoubles;

/**
 * \brief Reads the specified number of 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*)readDataArrayWithSize: (size_t)size;

/**
 * \brief Reads the specified number of 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
				    count: (size_t)nItems;

/**
 * \brief Returns an OFDataArray with all the remaining data of the stream.
 *
 * \return An OFDataArray with an item size of 1 with all the data of the
 *	   stream until the end of the stream is reached.
 */

 * \warning Only call this when you know that enough data is available!
 *	    Otherwise you will get an exception!
 *
 * \param encoding The encoding of the string to read from the stream
 * \param length The length (in bytes) of the string to read from the stream
 * \return A string with the specified length
 */
- (OFString*)readStringWithLength: (size_t)length
			 encoding: (of_string_encoding_t)encoding;

/**
 * \brief Reads 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.
 */

 *
 * \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
		      encoding: (of_string_encoding_t)encoding;

/**
 * \brief Tries to reads until the specified string or \\0 is found or the end
 *	  of stream (see readTillDelimiter:) and returns nil if not enough data
 *	  has been received yet.
 *
 * \param delimiter The delimiter

 *
 * \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*)tryReadTillDelimiter: (OFString*)delimiter
			 encoding: (of_string_encoding_t)encoding;

/**
 * \brief Returns a boolen whether writes are buffered.
 *
 * \return A boolean whether writes are buffered
 */
- (BOOL)writeBufferEnabled;

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

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

/**
 * \brief 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
 */

- (void)writeBuffer: (const void*)buffer
	     length: (size_t)length;

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

 *	  big endian.
 *
 * \param nInt16 The number of uint16_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeBigEndianInt16s: (const uint16_t*)buffer
			 count: (size_t)nInt16s;

/**
 * \brief Writes the specified number of uint32_ts into the stream, encoded in
 *	  big endian.
 *
 * \param nInt32 The number of uint32_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeBigEndianInt32s: (const uint32_t*)buffer
			 count: (size_t)nInt32s;

/**
 * \brief Writes the specified number of uint64_ts into the stream, encoded in
 *	  big endian.
 *
 * \param nInt64 The number of uint64_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeBigEndianInt64s: (const uint64_t*)buffer
			 count: (size_t)nInt64s;

/**
 * \brief Writes the specified number of floats into the stream, encoded in big
 *	  endian.
 *
 * \param nFloats The number of floats to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeBigEndianFloats: (const float*)buffer
			 count: (size_t)nFloats;

/**
 * \brief Writes the specified number of doubles into the stream, encoded in
 *	  big endian.
 *
 * \param nDoubles The number of doubles to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeBigEndianDoubles: (const double*)buffer
			  count: (size_t)nDoubles;

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

 *	  little endian.
 *
 * \param nInt16 The number of uint16_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeLittleEndianInt16s: (const uint16_t*)buffer
			    count: (size_t)nInt16s;

/**
 * \brief Writes the specified number of uint32_ts into the stream, encoded in
 *	  little endian.
 *
 * \param nInt32 The number of uint32_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeLittleEndianInt32s: (const uint32_t*)buffer
			    count: (size_t)nInt32s;

/**
 * \brief Writes the specified number of uint64_ts into the stream, encoded in
 *	  little endian.
 *
 * \param nInt64 The number of uint64_ts to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeLittleEndianInt64s: (const uint64_t*)buffer
			    count: (size_t)nInt64s;

/**
 * \brief Writes the specified number of floats into the stream, encoded in
 *	  little endian.
 *
 * \param nFloats The number of floats to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */
- (size_t)writeLittleEndianFloats: (const float*)buffer
			    count: (size_t)nFloats;

/**
 * \brief Writes the specified number of doubles into the stream, encoded in
 *	  little endian.
 *
 * \param nDoubles The number of doubles to write
 * \param buffer The buffer from which the data is written to the stream after
 *		 it has been byte swapped if necessary
 * \return The number of bytes written to the stream
 */

- (size_t)writeLittleEndianDoubles: (const double*)buffer
			     count: (size_t)nDoubles;

/**
 * \brief Writes from an OFDataArray into the stream.
 *
 * \param dataArray The OFDataArray to write into the stream
 * \return The number of bytes written
 */

 * specifier for objects.
 *
 * \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: (OFConstantString*)format
	    arguments: (va_list)arguments;

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

/**
 * \brief Returns whether the stream is in blocking mode.
 *
 * \return Whether the stream is in blocking mode

- (int)fileDescriptor;

/**
 * \brief Closes the stream.
 */
- (void)close;


- (size_t)_readIntoBuffer: (void*)buffer
		   length: (size_t)length;
- (void)_writeBuffer: (const void*)buffer
	      length: (size_t)length;
- (BOOL)_isWaitingForDelimiter;
@end