/// <summary>Creates a new compressor using the specified compression level.</summary>
/// <remarks>
/// Creates a new compressor using the specified compression level.
/// Compressed data will be generated in ZLIB format.
/// </remarks>
/// <param name="level">Compression level #CompressionLevel</param>
/// <param name="strategy">Compression strategy #CompressionStrategy</param>
/// <param name="header">Compression header #CompressionHeader</param>
/// <param name="directBufferSize">Size of the direct buffer to be used.</param>
public ZlibCompressor(ZlibCompressor.CompressionLevel level, ZlibCompressor.CompressionStrategy
strategy, ZlibCompressor.CompressionHeader header, int directBufferSize)
{
this.level = level;
this.strategy = strategy;
this.windowBits = header;
stream = Init(this.level.CompressionLevel(), this.strategy.CompressionStrategy(),
this.windowBits.WindowBits());
this.directBufferSize = directBufferSize;
uncompressedDirectBuf = ByteBuffer.AllocateDirect(directBufferSize);
compressedDirectBuf = ByteBuffer.AllocateDirect(directBufferSize);
compressedDirectBuf.Position(directBufferSize);
}
/// <summary>
/// Prepare the compressor to be used in a new stream with settings defined in
/// the given Configuration.
/// </summary>
/// <remarks>
/// Prepare the compressor to be used in a new stream with settings defined in
/// the given Configuration. It will reset the compressor's compression level
/// and compression strategy.
/// </remarks>
/// <param name="conf">Configuration storing new settings</param>
public virtual void Reinit(Configuration conf)
{
Reset();
if (conf == null)
{
return;
}
End(stream);
level = ZlibFactory.GetCompressionLevel(conf);
strategy = ZlibFactory.GetCompressionStrategy(conf);
stream = Init(level.CompressionLevel(), strategy.CompressionStrategy(), windowBits
.WindowBits());
if (Log.IsDebugEnabled())
{
Log.Debug("Reinit compressor with new compression configuration");
}
}
/// <summary>reinit the compressor with the given configuration.</summary>
/// <remarks>
/// reinit the compressor with the given configuration. It will reset the
/// compressor's compression level and compression strategy. Different from
/// <tt>ZlibCompressor</tt>, <tt>BuiltInZlibDeflater</tt> only support three
/// kind of compression strategy: FILTERED, HUFFMAN_ONLY and DEFAULT_STRATEGY.
/// It will use DEFAULT_STRATEGY as default if the configured compression
/// strategy is not supported.
/// </remarks>
public virtual void Reinit(Configuration conf)
{
Reset();
if (conf == null)
{
return;
}
SetLevel(ZlibFactory.GetCompressionLevel(conf).CompressionLevel());
ZlibCompressor.CompressionStrategy strategy = ZlibFactory.GetCompressionStrategy(
conf);
try
{
SetStrategy(strategy.CompressionStrategy());
}
catch (ArgumentException)
{
Log.Warn(strategy + " not supported by BuiltInZlibDeflater.");
SetStrategy(DefaultStrategy);
}
if (Log.IsDebugEnabled())
{
Log.Debug("Reinit compressor with new compression configuration");
}
}
public static void SetCompressionStrategy(Configuration conf, ZlibCompressor.CompressionStrategy
strategy)
{
conf.SetEnum("zlib.compress.strategy", strategy);
}
protected internal void Construct(ZlibCompressor.CompressionLevel level, ZlibCompressor.CompressionStrategy
strategy, ZlibCompressor.CompressionHeader header, int directBufferSize)
{
}