/// <summary>
/// Method to open an existing storage from stream
/// </summary>
/// <param name="_stream">Already opened stream with zip contents</param>
/// <param name="_access">File access mode for stream operations</param>
/// <returns>A valid ZipStorer object</returns>
public static ZipStorer Open(Stream _stream, FileAccess _access)
{
if (!_stream.CanSeek && _access != FileAccess.Read)
{
throw new InvalidOperationException("Stream cannot seek");
}
ZipStorer zip = new ZipStorer();
//zip.FileName = _filename;
zip.ZipFileStream = _stream;
zip.Access = _access;
if (zip.ReadFileInfo())
{
zip.ReadCentralDirAction(zip.Files.Add);
return(zip);
}
throw new System.IO.InvalidDataException();
}
/// <summary>
/// 释放包内文件到当前目录下并保留覆盖文件的文件备份
/// </summary>
/// <param name="zipFilePath">要释放的zip包文件</param>
/// <param name="extraDir">释放目录</param>
/// <param name="overrideFpkgPath">覆盖文件备份包名称,为空或不传值则自动命名</param>
public static void ExtractZipToDirWithOverrideBak(string zipFilePath, string extraDir, string overrideFpkgPath)
{
if (string.IsNullOrEmpty(overrideFpkgPath))
{
int idx = zipFilePath.IndexOf('.');
overrideFpkgPath = zipFilePath.Substring(0, idx) + "_overridebak.zip";
}
MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(ms);
int successCount = 0, failedBakCount = 0, overrideCount = 0;
using (ZipStorer zipBak = ZipStorer.Create(overrideFpkgPath, ""))
{
using (ZipStorer zip = Open(zipFilePath, FileAccess.Read))
{
if (!Directory.Exists(extraDir))
{
Directory.CreateDirectory(extraDir);
}
zip.ReadCentralDirAction(delegate(ZipFileEntry f)
{
string targetFilePath = Path.Combine(extraDir, f.FilenameInZip);
bool backupSuccess = true;
if (File.Exists(targetFilePath))
{
sw.Write(string.Format("#备份文件{0}", f.FilenameInZip));
try
{
zipBak.AddFile(Compression.Deflate, targetFilePath, f.FilenameInZip, "");
sw.WriteLine(" OK!");
successCount++;
}
catch (Exception bakEx)
{
backupSuccess = false;
sw.WriteLine();
sw.WriteLine(string.Format("\n#{0} 备份失败 \n#{1}", f.FilenameInZip, bakEx.Message.Replace("\n", "\n#")));
failedBakCount++;
}
}
if (!backupSuccess)
{
sw.WriteLine(string.Format("## {0} 因备份失败未更新", f.FilenameInZip));
}
else
{
try
{
zip.ExtractFile(f, targetFilePath);
overrideCount++;
}
catch (Exception ioEx)
{
sw.WriteLine(string.Format("\n##*{0} 覆盖失败 \n#{1}", f.FilenameInZip, ioEx.Message.Replace("\n", "\n#")));
}
}
});
}
}
sw.WriteLine(string.Format("# -> 共备份成功{0}个文件，{1}个失败，覆盖{2}个文件，{3}个文件未被更新！", successCount, failedBakCount, overrideCount, successCount - overrideCount));
sw.Flush();
sw.Close();
File.WriteAllBytes(overrideFpkgPath.Replace(".zip", ".log"), ms.ToArray());
ms.Close();
ms.Dispose();
}