Question

我不明白“为什么gzip / deflate压缩小文件导致许多尾随零？”的答案（Why does gzip/deflate compressing a small file result in many trailing zeroes?）
如何在.NET环境中将少量数据½-2 Kbyte压缩到最小尺寸？（运行时对我来说不是问题。我可以换算速度吗？我应该使用第三方产品吗？开发人员许可证费用没问题，但运行时许可证没有。）
有关如何改进以下代码的任何建议：
（a）压缩比更高？
（b）更恰当地使用溪流？

以下是需要改进的C＃代码：

private static byte[] SerializeAndCompress(MyClass myObject)  
{
   using (var inStream = new System.IO.MemoryStream())
   {

     Serializer.Serialize< MyClass >(inStream, myObject); // PROTO-buffer  serialization. (Code not included here.)
     byte[] gZipBytearray = GZipCompress(inStream);
     return gZipBytearray;
   }
}

private static Byte[] GZipCompress(MemoryStream inStream)
{
   inStream.Position = 0;

   byte[] byteArray;
   {
      using (MemoryStream outStream = new MemoryStream())
      {
         bool LeaveOutStreamOpen = true;
         using (GZipStream compressStream = new GZipStream(outStream, 
            CompressionMode.Compress, LeaveOutStreamOpen))
         {
         // Copy the input stream into the compression stream.
         // inStream.CopyTo(Compress); TODO: "Uncomment" this line and remove the next one after upgrade to .NET 4 or later.
            CopyFromStreamToStream(inStream, compressStream);
     }
     byteArray = CreateByteArrayFromStream(outStream); // outStream is complete first after compressStream have been closed.
      }
   }
   return byteArray;
}

private static void CopyFromStreamToStream(Stream sourceStream, Stream destinationStream)
{
   byte[] buffer = new byte[4096];
   int numRead;
   while ((numRead = sourceStream.Read(buffer, 0, buffer.Length)) != 0)
   {
     destinationStream.Write(buffer, 0, numRead);
   }
}

private static byte[] CreateByteArrayFromStream(MemoryStream outStream)
{
   byte[] byteArray = new byte[outStream.Length];
   outStream.Position = 0;
   outStream.Read(byteArray, 0, (int)outStream.Length);
   return byteArray;
}

压缩少量数据时如何实现最小尺寸无损？

0 个答案: