142 lines
5.5 KiB
C#
142 lines
5.5 KiB
C#
using System;
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using System.IO;
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using System.IO.Compression;
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//using ICSharpCode.SharpZipLib.Zip;
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namespace AllBase
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{
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public static class ZipHelper
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{
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/// <summary>
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/// GZip压缩
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/// </summary>
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/// <param name="rawData"></param>
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/// <returns></returns>
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public static byte[] Compress(byte[] rawData)
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{
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if (rawData == null || rawData.Length < 1000)
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return rawData;
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MemoryStream ms = new MemoryStream();
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GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Compress, true);
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compressedzipStream.Write(rawData, 0, rawData.Length);
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compressedzipStream.Close();
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return ms.ToArray();
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}
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/// <summary>
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/// ZIP解压
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/// </summary>
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/// <param name="zippedData"></param>
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/// <returns></returns>
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public static byte[] Decompress(byte[] zippedData)
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{
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if (zippedData == null || zippedData.Length == 0)
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return null;
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if (zippedData.Length < 100)
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return zippedData;
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if (zippedData[2] != 0x8 || zippedData[3] != 0x0 || zippedData[4] != 0x0
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|| zippedData[5] != 0x0 || zippedData[6] != 0x0 || zippedData[7] != 0x0
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|| zippedData[0] != 31 || zippedData[1] != 139)//软加速判断头尾是否正确
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return zippedData;
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try
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{
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MemoryStream ms = new MemoryStream(zippedData);
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GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Decompress);
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MemoryStream outBuffer = new MemoryStream();
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byte[] block = new byte[1024];
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while (true)
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{
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int bytesRead = compressedzipStream.Read(block, 0, block.Length);
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if (bytesRead < 1)
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break;
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outBuffer.Write(block, 0, bytesRead);
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}
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compressedzipStream.Close();
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return outBuffer.ToArray();
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}
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catch
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{
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}
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return zippedData;
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}
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/// <summary>
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/// 解压文件到指定文件夹
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/// </summary>
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/// <param name="sourceFile">压缩文件</param>
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/// <param name="destinationDirectory">目标文件夹，如果为空则解压到当前文件夹下</param>
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/// <param name="password">密码</param>
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/// <returns></returns>
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//public static bool DecomparessFile(string sourceFile, string destinationDirectory = null, string password = null)
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//{
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// bool result = false;
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// int BufferSize = 1024*128;
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// if (!File.Exists(sourceFile))
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// {
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// return false;
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// }
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// if (string.IsNullOrWhiteSpace(destinationDirectory))
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// {
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// destinationDirectory = Path.GetDirectoryName(sourceFile);
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// }
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// try
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// {
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// if (!Directory.Exists(destinationDirectory))
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// {
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// Directory.CreateDirectory(destinationDirectory);
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// }
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// using (ZipInputStream zipStream = new ZipInputStream(File.Open(sourceFile, FileMode.Open,
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// FileAccess.Read, FileShare.Read)))
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// {
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// zipStream.Password = password;
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// ZipEntry zipEntry = zipStream.GetNextEntry();
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// while (zipEntry != null)
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// {
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// if (zipEntry.IsDirectory)//如果是文件夹则创建
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// {
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// Directory.CreateDirectory(Path.Combine(destinationDirectory,
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// Path.GetDirectoryName(zipEntry.Name)));
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// }
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// else
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// {
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// string fileName = Path.GetFileName(zipEntry.Name);
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// if (!string.IsNullOrEmpty(fileName) && fileName.Trim().Length > 0)
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// {
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// FileInfo fileItem = new FileInfo(Path.Combine(destinationDirectory, zipEntry.Name));
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// using (FileStream writeStream = fileItem.Create())
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// {
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// byte[] buffer = new byte[BufferSize];
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// int readLength = 0;
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// do
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// {
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// readLength = zipStream.Read(buffer, 0, BufferSize);
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// writeStream.Write(buffer, 0, readLength);
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// } while (readLength == BufferSize);
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// writeStream.Flush();
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// writeStream.Close();
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// }
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// fileItem.LastWriteTime = zipEntry.DateTime;
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// }
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// }
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// zipEntry = zipStream.GetNextEntry();//获取下一个文件
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// }
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// zipStream.Close();
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// }
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// result = true;
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// }
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// catch (System.Exception ex)
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// {
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// throw new Exception("文件解压发生错误", ex);
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// }
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// return result;
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//}
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}
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}
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