RM.Common/DotNetFile/GZipHelper.cs

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using System;
using System.IO;
using System.IO.Compression;
using System.Text;

namespace RM.Common.DotNetFile
{
    public class GZipHelper
    {
        public static string Compress(string text)
        {
            byte[] buffer = Encoding.UTF8.GetBytes(text);
            MemoryStream ms = new MemoryStream();
            using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true))
            {
                zip.Write(buffer, 0, buffer.Length);
            }
            ms.Position = 0L;
            byte[] compressed = ms.ToArray();
            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 Convert.ToBase64String(gzBuffer);
        }

        public static string Uncompress(string compressedText)
        {
            byte[] gzBuffer = Convert.FromBase64String(compressedText);
            MemoryStream ms = new MemoryStream();
            int msgLength = BitConverter.ToInt32(gzBuffer, 0);
            ms.Write(gzBuffer, 4, gzBuffer.Length - 4);
            byte[] buffer = new byte[msgLength];
            ms.Position = 0L;
            GZipStream zip = new GZipStream(ms, CompressionMode.Decompress);
            zip.Read(buffer, 0, buffer.Length);
            return Encoding.UTF8.GetString(buffer);
        }

        public static T GZip<T>(Stream stream, CompressionMode mode) where T : Stream
        {
            byte[] writeData = new byte[4096];
            T ms = default(T);
            T result;
            using (Stream sg = new GZipStream(stream, mode))
            {
                while (true)
                {
                    Array.Clear(writeData, 0, writeData.Length);
                    int size = sg.Read(writeData, 0, writeData.Length);
                    if (size <= 0)
                    {
                        break;
                    }
                    ms.Write(writeData, 0, size);
                }
                result = ms;
            }
            return result;
        }