/// <param name="buf">the string literal to be decoded</param>
/// <param name="buf">the string literal to be decoded</param>
/// <returns>the output stream for the compressed data</returns>
/// <returns>the output stream for the compressed data</returns>
/// <exception cref="IOException">throws IOException if an I/O error occurs. In particular, an <code>IOException</code> may be thrown if the output stream has been closed.</exception>
/// <exception cref="IOException">throws IOException if an I/O error occurs. In particular, an <code>IOException</code> may be thrown if the output stream has been closed.</exception>
/// Compresses the input string literal using the Huffman coding.
/// </summary>
/// <param name="output">the output stream for the compressed data</param>
/// <param name="data">the string literal to be Huffman encoded</param>
/// <param name="off">the start offset in the data</param>
/// <param name="len">the number of bytes to encode</param>
/// <exception cref="IOException">if an I/O error occurs. In particular, an <code>IOException</code> may be thrown if the output stream has been closed.</exception>
/// <exception cref="IOException">if an I/O error occurs. In particular, an <code>IOException</code> may be thrown if the output stream has been closed.</exception>
/// When overridden in a derived class, reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read.
/// </summary>
/// <param name="buffer">An array of bytes. When this method returns, the buffer contains the specified byte array with the values between <paramref name="offset" /> and (<paramref name="offset" /> + <paramref name="count" /> - 1) replaced by the bytes read from the current source.</param>
/// <param name="offset">The zero-based byte offset in <paramref name="buffer" /> at which to begin storing the data read from the current stream.</param>
/// <param name="count">The maximum number of bytes to be read from the current stream.</param>
/// <returns>
/// The total number of bytes read into the buffer. This can be less than the number of bytes requested if that many bytes are not currently available, or zero (0) if the end of the stream has been reached.
/// </returns>
intRead(byte[]buffer,intoffset,intcount);
/// <summary>
/// Read the specified number (or less) of raw bytes from the base stream to the given buffer to the specified offset