C# Compress Decompress byte[] 壓縮 解壓縮 byte[]

public static byte[] Compress(byte[] buffer)
{
try
{
MemoryStream ms = new MemoryStream();
GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true);
zip.Write(buffer, 0, buffer.Length);
zip.Close();
ms.Position = 0;

MemoryStream outStream = new MemoryStream();

byte[] compressed = new byte[ms.Length];
ms.Read(compressed, 0, compressed.Length);

byte[] gzBuffer = new byte[compressed.Length + 4];
Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);
Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);
return gzBuffer;
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}


public static byte[] Decompress(byte[] gzBuffer)
{
try
{
MemoryStream ms = new MemoryStream();
int msgLength = BitConverter.ToInt32(gzBuffer, 0);
ms.Write(gzBuffer, 4, gzBuffer.Length - 4);

byte[] buffer = new byte[msgLength];

ms.Position = 0;
GZipStream zip = new GZipStream(ms, CompressionMode.Decompress);
zip.Read(buffer, 0, buffer.Length);

return buffer;
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}