public void Write(EndianBinaryWriter writer)
{
var decMemStream = new MemoryStream();
var decWriter = new EndianBinaryWriter(decMemStream);
decWriter.Write(Literals.Length);
foreach (var literal in Literals)
{
decWriter.SeekNext(4); //uint size
var oldPos = decWriter.Position;
BeamTerm.TermToBinary(decWriter, literal);
var len = (uint)(decWriter.Position - oldPos);
decWriter.SeekBack((int)(len + 4));
decWriter.Write(len);
decWriter.SeekNext((int)len);
}
decMemStream.Position = 0;
var decBytes = decMemStream.ToArray();
writer.Write(decBytes.Length);
var encBytes = ZLibCompressor.Compress(decBytes);
writer.Write(encBytes);
}
public void ZLibCompressStreamTest()
{
ZLibCompressor target = new ZLibCompressor();
string originalText = "Test string.";
MemoryStream msOriginal = new MemoryStream(ASCIIEncoding.ASCII.GetBytes(originalText));
byte[] compressbuffer = new byte[2000];
MemoryStream msCompressed = new MemoryStream(compressbuffer);
int outLen = 0;
ZLibError err = target.Compress(msOriginal, msCompressed, ref outLen, ZLibQuality.Default);
Assert.AreEqual(ZLibError.Okay, err);
MemoryStream msToDecompress = new MemoryStream(compressbuffer, 0, outLen);
byte[] decompressbuffer = new byte[2000];
MemoryStream msFinalResult = new MemoryStream(decompressbuffer);
err = target.Decompress(msToDecompress, msFinalResult, ref outLen);
Assert.AreEqual(ZLibError.Okay, err);
string result = ASCIIEncoding.ASCII.GetString(decompressbuffer, 0, outLen);
Assert.AreEqual(originalText, result);
}
public void ZLibStream_Compressor_2()
{
byte[] input = Encoding.UTF8.GetBytes("ABCDEF");
// Compress first,
// 78-9C-73-74-72-76-71-75-03-00-05-7E-01-96
byte[] compBytes = ZLibCompressor.Compress(input);
// then Decompress.
byte[] decompBytes = ZLibCompressor.Decompress(compBytes);
// Comprare SHA256 Digest
byte[] inputDigest = TestSetup.SHA256Digest(input);
byte[] decompDigest = TestSetup.SHA256Digest(decompBytes);
Assert.IsTrue(decompDigest.SequenceEqual(inputDigest));
}
/// <summary>
/// Compresses the specified input in
/// </summary>
public static int CompressInZLibFormat(byte[] input, out byte[] output)
{
byte[] compressed = ZLibCompressor.Compress(input, CompressionLevel.Level1);
int compressedLength = compressed.Length;
int uncompressedLength = input.Length;
output = new byte[compressedLength + 4];
output[0] = (byte)uncompressedLength;
output[1] = (byte)(uncompressedLength >> 8);
output[2] = (byte)(uncompressedLength >> 16);
output[3] = (byte)(uncompressedLength >> 24);
Array.Copy(compressed, 0, output, 4, compressedLength);
return(output.Length);
}
public void ZLibStream_Compressor_1()
{
void Template(string fileName, ZLibCompLevel level)
{
string filePath = Path.Combine(TestSetup.SampleDir, fileName);
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
using (MemoryStream compMs = ZLibCompressor.Compress(fs))
using (MemoryStream decompMs = ZLibCompressor.Decompress(compMs))
{
// Compare SHA256 Digest
fs.Position = 0;
byte[] fileDigest = TestSetup.SHA256Digest(fs);
byte[] decompDigest = TestSetup.SHA256Digest(decompMs);
Assert.IsTrue(decompDigest.SequenceEqual(fileDigest));
}
}
Template("ex1.jpg", ZLibCompLevel.Default);
Template("ex2.jpg", ZLibCompLevel.BestCompression);
Template("ex3.jpg", ZLibCompLevel.BestSpeed);
}
/// <summary>Сжимает массив</summary>
/// <param name="data">Входной массив.</param>
/// <returns>Сжатый массив</returns>
public static byte[] Compress(byte[] data)
{
return(ZLibCompressor.Compress(data));
}
/// <summary>
/// 将录制的数据写入wav文件 改写为UDP发送
/// </summary>
private void RecordCapturedData(Socket Client, EndPoint epserver)
{
byte[] CaptureData = null;
byte[] SendData = null;
int ReadPos = 0;
int CapturePos = 0;
int LockSize = 0;
mRecBuffer.GetCurrentPosition(out CapturePos, out ReadPos);
LockSize = ReadPos - mNextCaptureOffset;
if (LockSize < 0)
{
LockSize += mBufferSize;
}
// 对齐缓冲区边界,实际上由于开始设定完整,这个操作是多余的.
LockSize -= (LockSize % mNotifySize);
if (0 == LockSize)
{
return;
}
// 读取缓冲区内的数据
CaptureData = (byte[])mRecBuffer.Read(mNextCaptureOffset, typeof(byte), LockFlag.None, LockSize);
// 更新已经录制的数据长度.
mSampleCount += CaptureData.Length;
//压缩数据，实测压缩率在50%左右
SendData = ZLibCompressor.Compress(CaptureData);
// 写入Wav文件 ,在这里改成发送
// mWriter.Write(SendData, 0, SendData.Length);
// mWriter.Write(CaptureData, 0, CaptureData.Length);
//发送文件到网络
try
{
Client.SendTo(SendData, epServer);//传送语音
}
catch (Exception e)
{
MessageBox.Show(e.Message, "错误");
}
// 移动录制数据的起始点,通知消息只负责指示产生消息的位置,并不记录上次录制的位置
mNextCaptureOffset += CaptureData.Length;
mNextCaptureOffset %= mBufferSize; // Circular buffer
}
