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【Asp.NET】 gzip压缩

作者: / 发布于2019/11/4/ 603

gzip压缩

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.IO.Compression;
using System.Data;

namespace Lis2013HISWSTest
{
public class ZipHelper
{
/// 
/// 解压
/// 
/// 
/// 
public static DataSet GetDatasetByString(string Value)
{
DataSet ds = new DataSet();
string CC = GZipDecompressString(Value);
System.IO.StringReader Sr = new StringReader(CC);
ds.ReadXml(Sr);
return ds;
}
/// 
/// 根据DATASET压缩字符串
/// 
/// 
/// 
public static string GetStringByDataset(string ds)
{
return GZipCompressString(ds);
}
/// 
/// 将传入字符串以GZip算法压缩后，返回Base64编码字符
/// 
/// 需要压缩的字符串
/// 压缩后的Base64编码的字符串
public static string GZipCompressString(string rawString)
{
if (string.IsNullOrEmpty(rawString) || rawString.Length == 0)
{
return “”;
}
else
{
byte[] rawData = System.Text.Encoding.UTF8.GetBytes(rawString.ToString());
byte[] zippedData = Compress(rawData);
return (string)(Convert.ToBase64String(zippedData));
}







    
    /// <summary>
    /// GZip压缩
    /// </summary>
    /// <param name="rawData"></param>
    /// <returns></returns>
    public static byte[] Compress(byte[] rawData)
    {
        MemoryStream ms = new MemoryStream();
        GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Compress, true);
        compressedzipStream.Write(rawData, 0, rawData.Length);
        compressedzipStream.Close();
        return ms.ToArray();
    }
    /// <summary>
    /// 将传入的二进制字符串资料以GZip算法解压缩
    /// </summary>
    /// <param name="zippedString">经GZip压缩后的二进制字符串</param>
    /// <returns>原始未压缩字符串</returns>
    public static string GZipDecompressString(string zippedString)
    {
        if (string.IsNullOrEmpty(zippedString) || zippedString.Length == 0)
        {
            return "";
        }
        else
        {
            byte[] zippedData = Convert.FromBase64String(zippedString.ToString());
            return (string)(System.Text.Encoding.UTF8.GetString(Decompress(zippedData)));
        }
    }
    /// <summary>
    /// ZIP解压
    /// </summary>
    /// <param name="zippedData"></param>
    /// <returns></returns>
    public static byte[] Decompress(byte[] zippedData)
    {
        MemoryStream ms = new MemoryStream(zippedData);
        GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Decompress);
        MemoryStream outBuffer = new MemoryStream();
        byte[] block = new byte[1024];
        while (true)
        {
            int bytesRead = compressedzipStream.Read(block, 0, block.Length);
            if (bytesRead <= 0)
                break;
            else
                outBuffer.Write(block, 0, bytesRead);
        }
        compressedzipStream.Close();
        return outBuffer.ToArray();
    }
}

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