php&net对称压缩解压缩研讨

php&.net对称压缩解压缩探讨

http://blog.csdn.net/michaell_zhang/article/details/5979883

C#客户端访问PHP SOAP WebService，当传输大量文本数据时，可以通过压缩减少网络传输。

C#在System.IO.Compression命名空间下提供了两个类GZipStream 类和DeflateStream类来进行数据的压缩和解压缩。经本人实验，在C#下使用GZipStream压缩的字符串在PHP下使用gzuncompress函数无法解压缩，有人说可以使用gzdecode解开，但本人的PHP不支持gzdecode函数，但有gzencode函数（why?原因未明，据说是PHP的BUG，可能到PHP6才提供此函数）。

C#下使用DeflateStream类压缩文本后，可以在PHP下用gzinflate解压缩。示例代码如下：

客户端C#（在头4个字节增加了原文本的长度，方便在C#中解压缩，对于在PHP端解压缩这个没有用处）：

public static string Compress(string text)        {            byte[] buffer = Encoding.UTF8.GetBytes(text);            MemoryStream ms = new MemoryStream();            using (DeflateStream zip = new DeflateStream(ms, CompressionMode.Compress, true))            {                zip.Write(buffer, 0, buffer.Length);            }            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];            System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);            System.Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);            return Convert.ToBase64String(gzBuffer);        }

?服务端PHP：

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function Decompress($strSource){    $strTemp = base64_decode($strSource);    $strTemp = substr($strTemp, 4);    return gzinflate($strTemp);}

?支持中文，编码为UTF8.

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http://blog.csdn.net/allsharps/article/details/7357328

/// <summary>    /// 简单的压缩    /// </summary>    public static class CompressHelper    {        /// <summary>        /// 压缩字符串        /// </summary>        /// <param name="str">        /// <returns></returns>        public static byte[] CompressString(string str)        {            return CompressBytes(Encoding.UTF8.GetBytes(str));        }        /// <summary>        /// 压缩二进制        /// </summary>        /// <param name="str">        /// <returns></returns>        public static byte[] CompressBytes(byte[] str)        {            var ms = new MemoryStream(str) {Position = 0};            var outms = new MemoryStream();            using (var deflateStream = new DeflateStream(outms, CompressionMode.Compress, true))            {                var buf = new byte[1024];                int len;                while ((len = ms.Read(buf, 0, buf.Length)) > 0)                    deflateStream.Write(buf, 0, len);            }            return outms.ToArray();        }        /// <summary>        /// 解压字符串        /// </summary>        /// <param name="str">        /// <returns></returns>        public static string DecompressString(byte[] str)        {            return Encoding.UTF8.GetString(DecompressBytes(str));        }        /// <summary>        /// 解压二进制        /// </summary>        /// <param name="str">        /// <returns></returns>        public static byte[] DecompressBytes(byte[] str)        {            var ms = new MemoryStream(str) {Position = 0};            var outms = new MemoryStream();            using (var deflateStream = new DeflateStream(ms, CompressionMode.Decompress, true))            {                var buf = new byte[1024];                int len;                while ((len = deflateStream.Read(buf, 0, buf.Length)) > 0)                    outms.Write(buf, 0, len);            }            return outms.ToArray();        }    }

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