using System;

using System.IO;

using System.IO.Compression;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Text;

using ICSharpCode.SharpZipLib.BZip2;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

namespace CompressClass

{

    public static class CompressDeCompress

    {

        //压缩SharpZip

        public static string SharpZipCompress(string uncompressedString)

        {

            byte[] bytData = System.Text.Encoding.Unicode.GetBytes(uncompressedString);

            MemoryStream ms = new MemoryStream();

            Stream s = new BZip2OutputStream(ms);

            s.Write(bytData, 0, bytData.Length);

            s.Close();

            byte[] compressedData = (byte[])ms.ToArray();

            return System.Convert.ToBase64String(compressedData, 0, compressedData.Length);

        }

        //解压SharpZip

        public static string SharpZipDeCompress(string compressedString)

        {

            System.Text.StringBuilder uncompressedString = new System.Text.StringBuilder();

            int totalLength = 0;

            byte[] bytInput = System.Convert.FromBase64String(compressedString); ;

            byte[] writeData = new byte[4096];

            Stream s2 = new BZip2InputStream(new MemoryStream(bytInput));

            while (true)

            {

                int size = s2.Read(writeData, 0, writeData.Length);

                if (size > 0)

                {

                    totalLength += size;

                    uncompressedString.Append(System.Text.Encoding.Unicode.GetString(writeData, 0, size));

                }

                else

                {

                    break;

                }

            }

            s2.Close();

            return uncompressedString.ToString();

        }

        //压缩Gzip

        public static string GzipCompress(string uncompressedString)

        {

            byte[] bytData = System.Text.Encoding.Unicode.GetBytes(uncompressedString);

            MemoryStream ms = new MemoryStream();

            Stream s = new GZipStream(ms, CompressionMode.Compress);

            s.Write(bytData, 0, bytData.Length);

            s.Close();

            byte[] compressedData = (byte[])ms.ToArray();

            return System.Convert.ToBase64String(compressedData, 0, compressedData.Length);

        }

        //解压Gzip

        public static string GzipDeCompress(string compressedString)

        {

            System.Text.StringBuilder uncompressedString = new System.Text.StringBuilder();

            int totalLength = 0;

            byte[] bytInput = System.Convert.FromBase64String(compressedString); ;

            byte[] writeData = new byte[4096];

            Stream s2 = new GZipStream(new MemoryStream(bytInput), CompressionMode.Decompress);

            while (true)

            {

                int size = s2.Read(writeData, 0, writeData.Length);

                if (size > 0)

                {

                    totalLength += size;

                    uncompressedString.Append(System.Text.Encoding.Unicode.GetString(writeData, 0, size));

                }

                else

                {

                    break;

                }

            }

            s2.Close();

            return uncompressedString.ToString();

        }

    }

}