C# Compression.Deflater类代码示例

        public void Compress()
        {
            var deflater = new Deflater();
            byte[] packet = PacketData;
            deflater.SetInput(packet, 0, packet.Length);
            deflater.Finish();

            var compBuffer = new byte[1024];
            var ret = new List<byte>();

            while (!deflater.IsFinished)
            {
                try
                {
                    deflater.Deflate(compBuffer);
                    ret.AddRange(compBuffer);
                    Array.Clear(compBuffer, 0, compBuffer.Length);
                }
                catch (Exception ex)
                {
                    return;
                }
            }
            deflater.Reset();

            Seek((byte)_headerType, SeekOrigin.Begin);
            // Write the compressed bytes over whatever is there.
            Write(ret.ToArray());
            // Set the stream length to the end of the actual packet data.
            // This makes sure we don't have any 'junk' packets at the end.
            OutStream.SetLength(BaseStream.Position);
        }

 public ChunkDataPacket()
 {
     if (zLibDeflater == null)
         zLibDeflater = new Deflater(CompressionLevel);
     if (LockObject == null)
         LockObject = new object();
 }

        /// <summary>Compresses the specified byte range using the
        /// specified compressionLevel (constants are defined in
        /// java.util.zip.Deflater). 
        /// </summary>
        public static byte[] Compress(byte[] value_Renamed, int offset, int length, int compressionLevel)
        {
            /* Create an expandable byte array to hold the compressed data.
            * You cannot use an array that's the same size as the orginal because
            * there is no guarantee that the compressed data will be smaller than
            * the uncompressed data. */
            System.IO.MemoryStream bos = new System.IO.MemoryStream(length);

            Deflater compressor = new Deflater();

            try
            {
                compressor.SetLevel(compressionLevel);
                compressor.SetInput(value_Renamed, offset, length);
                compressor.Finish();

                // Compress the data
                byte[] buf = new byte[1024];
                while (!compressor.IsFinished)
                {
                    int count = compressor.Deflate(buf);
                    bos.Write(buf, 0, count);
                }
            }
            finally
            {
            }

            return bos.ToArray();
        }

        private const int CopyBufferSize = 32*1024;    // 32kb

        public void Compress(Stream source, Stream destination)
        {
            /*
            var deflater = new DeflaterOutputStream(destination, new Deflater(Deflater.DEFAULT_COMPRESSION, true));

            var dataBuffer = new byte[CopyBufferSize];
            StreamUtils.Copy(source, deflater, dataBuffer);
             */

            var def = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
            
            var inputData = new byte[source.Length - source.Position];
            source.Read(inputData, 0, inputData.Length);

            var buffer = new byte[CopyBufferSize];

            def.SetInput( inputData, 0, inputData.Length );
            def.Finish();

            while(!def.IsFinished)
            {
                int outputLen = def.Deflate(buffer, 0, buffer.Length);
                destination.Write( buffer, 0, outputLen );
            }

            def.Reset();
        }

        public void TestInflateDeflate()
        {
            MemoryStream ms = new MemoryStream();
            Deflater deflater = new Deflater(6);
            DeflaterOutputStream outStream = new DeflaterOutputStream(ms, deflater);

            byte[] buf = new byte[1000000];
            System.Random rnd = new Random();
            rnd.NextBytes(buf);

            outStream.Write(buf, 0, buf.Length);
            outStream.Flush();
            outStream.Finish();

            ms.Seek(0, SeekOrigin.Begin);

            InflaterInputStream inStream = new InflaterInputStream(ms);
            byte[] buf2 = new byte[buf.Length];
            int    pos  = 0;
            while (true) {
                int numRead = inStream.Read(buf2, pos, 4096);
                if (numRead <= 0) {
                    break;
                }
                pos += numRead;
            }

            for (int i = 0; i < buf.Length; ++i) {
                Assertion.AssertEquals(buf2[i], buf[i]);
            }
        }

        public byte[] Compress(byte[] input)
        {
            // Create the compressor with highest level of compression
            Deflater compressor = new Deflater();
            compressor.SetLevel(Deflater.BEST_COMPRESSION);

            // Give the compressor the data to compress
            compressor.SetInput(input);
            compressor.Finish();

            /*
             * Create an expandable byte array to hold the compressed data.
             * You cannot use an array that's the same size as the orginal because
             * there is no guarantee that the compressed data will be smaller than
             * the uncompressed data.
             */
            MemoryStream bos = new MemoryStream(input.Length);

            // Compress the data
            byte[] buf = new byte[1024];
            while (!compressor.IsFinished)
            {
                int count = compressor.Deflate(buf);
                bos.Write(buf, 0, count);
            }

            // Get the compressed data
            return bos.ToArray();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public byte[] Compress(Stream input)
        {
            String s = String.Format("Compressing output with level {0:d}", CompressionLevel);
            //Log.Debug(this, s);

            Deflater deflater = new Deflater(CompressionLevel, false);
            byte[] uncompressedData = new byte[(Int32)input.Length];
            input.Seek(0, SeekOrigin.Begin);
            input.Read(uncompressedData, 0, uncompressedData.Length);
            byte[] buffer = new byte[input.Length];

            try
            {
                deflater.SetInput(uncompressedData);
                deflater.Finish();
                int bytesDeflated = deflater.Deflate(buffer, 0, buffer.Length);

                byte[] compressedData = new byte[bytesDeflated];
                Array.Copy(buffer, compressedData, bytesDeflated);

                //Log.Debug(this, "Compression completed.");

                return compressedData;
            }
            catch (Exception e)
            {
                Log.Error(this, e);
                throw e;
            }
        }

 public static byte[] Compress(string str)
 {
     byte[] bytes = Encoding.Unicode.GetBytes(str);
     Deflater deflater = new Deflater(Deflater.BEST_COMPRESSION);
     deflater.SetInput(bytes);
     deflater.Finish();
     MemoryStream stream = new MemoryStream(bytes.Length);
     try
     {
         byte[] output = new byte[0x400];
         while (!deflater.IsFinished)
         {
             int count = deflater.Deflate(output);
             stream.Write(output, 0, count);
         }
     }
     finally
     {
         stream.Close();
     }
     byte[] buffer3 = stream.ToArray();
     if ((buffer3.Length % 2) == 0)
     {
         return buffer3;
     }
     byte[] buffer4 = new byte[buffer3.Length + 1];
     for (int i = 0; i < buffer3.Length; i++)
     {
         buffer4[i] = buffer3[i];
     }
     buffer4[buffer3.Length] = 0;
     return buffer4;
 }

		public static void IOCompress(byte[] input, int len, byte[] output, out int deflatedLength)
		{
			Deflater item = new Deflater();
			item.SetInput(input, 0, len);
			item.Finish();
			deflatedLength = item.Deflate(output, 0, output.Length);
		}

        public byte[] Compress(byte[] bytData, params int[] ratio)
        {
            int compRatio = 9;
            try
            {
                if (ratio[0] > 0)

                {
                    compRatio = ratio[0];
                }
            }
            catch
            {
                throw;
            }

            try
            {
                var ms = new MemoryStream();
                var defl = new Deflater(compRatio, false);
                Stream s = new DeflaterOutputStream(ms, defl);
                s.Write(bytData, 0, bytData.Length);
                s.Close();
                byte[] compressedData = ms.ToArray();
                 return compressedData;
            }
            catch
            {
                throw;

            }
        }

 ///	<summary>
 /// Construct an object writer for the specified repository.
 /// </summary>
 ///	<param name="repo"> </param>
 public ObjectWriter(Repository repo)
 {
     _r = repo;
     _buf = new byte[0x2000];
     _md = new MessageDigest();
     _def = new Deflater(_r.Config.getCore().getCompression());
 }

 public ObjectWriter(Repository repo)
 {
     this.r = repo;
     buf = new byte[8192];
     md = new MessageDigest(); // [henon] Sha1 hash digest generator
     def = new Deflater(r.Config.Core.Compression);
 }

		/// <summary>
		/// Performs deflate compression on the given data.
		/// </summary>
		/// <param name="input">the data to compress</param>
		/// <param name="output">the compressed data</param>
		public static void CompressZLib(byte[] input, byte[] output, int compressionLevel, out int deflatedLength)
		{
			Deflater item = new Deflater(compressionLevel);

			item.SetInput(input, 0, input.Length);
			item.Finish();
			deflatedLength = item.Deflate(output, 0, output.Length);
		}

 public ZlibStream(Stream inner, Inflater inflater, int buffSize)
 {
     _innerStream = inner;
     _in = inflater;
     _inBuff = new byte[buffSize];
     _outBuff = _inBuff;
     _out = new Deflater();
 }

        /// <summary>
        /// Compress an array of bytes.
        /// </summary>
        /// <param name="_pBytes">An array of bytes to be compressed.</param>
        /// <returns>Compressed bytes.</returns>
        /// <example>
        /// Following example demonstrates the way of compressing an ASCII string text.
        /// <code>
        /// public void Compress()
        /// {
        ///     string source = "Hello, world!";
        ///     byte[] source_bytes = System.Text.Encoding.ASCII.GetBytes(source);
        ///     byte[] compressed = DataCompression.Compress(source_bytes);
        ///     
        ///     // Process the compressed bytes here.
        /// }
        /// </code>
        /// </example>
        /// <remarks>It is the best practice that use the overrided <b>DataCompression.Compress</b> method with <see cref="System.String"/> parameter to compress a string.</remarks>
        public static byte[] Compress(byte[] _pBytes)
        {
            MemoryStream ms = new MemoryStream();

            Deflater mDeflater = new Deflater(Deflater.BEST_COMPRESSION);
            DeflaterOutputStream outputStream = new DeflaterOutputStream(ms, mDeflater, 131072);

            outputStream.Write(_pBytes, 0, _pBytes.Length);
            outputStream.Close();

            return ms.ToArray();
        }