資料流壓縮代碼

using System;using System.Collections.Generic;using System.Text;using System.IO;using System.IO.Compression;namespace CommonUtility.CompressionUtility{    public class CompressionUtility    {        /// <summary>        /// 讀取資料流中的位元組        /// </summary>        /// <param name="stream"></param>        /// <returns></returns>        public static byte[] ReadStreamToBytes(Stream stream)        {            byte[] buffer = new byte[64 * 1024];            MemoryStream ms = new MemoryStream();            int r = 0;            int l = 0;            long position = -1;            if (stream.CanSeek)            {                position = stream.Position;                stream.Position = 0;            }            while (true)            {                r = stream.Read(buffer, 0, buffer.Length);                if (r > 0)                {                    l += r;                    ms.Write(buffer, 0, r);                }                else                {                    break;                }            }            byte[] bytes = new byte[l];            ms.Position = 0;            ms.Read(bytes, 0, (int)l);            ms.Close();            ms = null;            if (position >= 0)            {                stream.Position = position;            }            return bytes;        }        /// <summary>        /// GZip演算法壓縮資料        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static byte[] GZipCompress(byte[] data)        {            MemoryStream ms = new MemoryStream();            GZipStream stream = new GZipStream(ms, CompressionMode.Compress, true);            stream.Write(data, 0, data.Length);            stream.Close();            stream.Dispose();            stream = null;            byte[] buffer = ReadStreamToBytes(ms);            ms.Close();            ms.Dispose();            ms = null;            return buffer;        }        /// <summary>        /// GZip演算法解壓資料        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static byte[] GZipDecompress(byte[] data)        {            MemoryStream ms = new MemoryStream(data);            GZipStream stream = new GZipStream(ms, CompressionMode.Decompress);            byte[] buffer = ReadStreamToBytes(stream);            ms.Close();            ms.Dispose();            ms = null;            stream.Close();            stream.Dispose();            stream = null;            return buffer;        }        /// <summary>        /// Deflate演算法壓縮資料        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static byte[] DeflateCompress(byte[] data)        {            MemoryStream ms = new MemoryStream();            DeflateStream stream = new DeflateStream(ms, CompressionMode.Compress, true);            stream.Write(data, 0, data.Length);            stream.Close();            stream.Dispose();            stream = null;            byte[] buffer = ReadStreamToBytes(ms);            ms.Close();            ms.Dispose();            ms = null;            return buffer;        }        /// <summary>        /// Deflate演算法解壓資料        /// </summary>        /// <param name="data"></param>        /// <returns></returns>        public static byte[] DeflateDecompress(byte[] data)        {            MemoryStream ms = new MemoryStream(data);            DeflateStream stream = new DeflateStream(ms, CompressionMode.Decompress);            byte[] buffer = ReadStreamToBytes(stream);            ms.Close();            ms.Dispose();            ms = null;            stream.Close();            stream.Dispose();            stream = null;            return buffer;        }    }}