GZip、Deflate压缩算法对应的C#压缩解压函数

GZip解压函数
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GZip压缩函数
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 1 /// <summary>
 2 /// GZip压缩函数
 3 /// </summary>
 4 /// <param name="data"></param>
 5 /// <returns></returns>
 6 public byte[] GZipCompress(byte[] data)
 7 {
 8     using (MemoryStream stream = new MemoryStream())
 9     {
10         using (GZipStream gZipStream = new GZipStream(stream, CompressionMode.Compress))
11         {
12             gZipStream.Write(data, 0, data.Length);
13             gZipStream.Close();
14         }
15         return stream.ToArray();
16     }
17 }

Deflate解压函数
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 1 /// <summary>
 2 /// Deflate解压函数
 3 /// JS:var details = eval('(' + utf8to16(zip_depress(base64decode(hidEnCode.value))) + ')')对应的C#压缩方法
 4 /// </summary>
 5 /// <param name="strSource"></param>
 6 /// <returns></returns>
 7 public string DeflateDecompress(string strSource)
 8 {
 9     byte[] buffer = Convert.FromBase64String(strSource);
10     using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
11     {
12         ms.Write(buffer, 0, buffer.Length);
13         ms.Position = 0;
14         using (System.IO.Compression.DeflateStream stream = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Decompress))
15         {
16             stream.Flush();
17             int nSize = 16 * 1024 + 256;    //假设字符串不会超过16K
18             byte[] decompressBuffer = new byte[nSize];
19             int nSizeIncept = stream.Read(decompressBuffer, 0, nSize);
20             stream.Close();
21             return System.Text.Encoding.UTF8.GetString(decompressBuffer, 0, nSizeIncept);   //转换为普通的字符串
22         }
23     }
24 }

Deflate压缩函数
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 1 /// <summary>
 2 /// Deflate压缩函数
 3 /// </summary>
 4 /// <param name="strSource"></param>
 5 /// <returns></returns>
 6 public string DeflateCompress(string strSource)
 7 {
 8     if (strSource == null || strSource.Length > 8 * 1024)
 9         throw new System.ArgumentException("字符串为空或长度太大！");
10     byte[] buffer = System.Text.Encoding.UTF8.GetBytes(strSource);
11     using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
12     {
13         using (System.IO.Compression.DeflateStream stream = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Compress, true))
14         {
15             stream.Write(buffer, 0, buffer.Length);
16             stream.Close();
17         }
18     byte[] compressedData = ms.ToArray();
19     ms.Close();
20     return Convert.ToBase64String(compressedData);      //将压缩后的byte[]转换为Base64String
21     }
22 }

posted @ 2011-04-28 16:16  吾爱易逝  阅读(4461)  评论(0)    收藏  举报