/// <summary>
///
/// </summary>
/// <param name="source"></param>
/// <param name="outputdir"></param>
/// <param name="ProgressCallback">由于无法直接获取整体解压缩后的流的大小，因此没有totoal值</param>
public static void DirDecompression(string source, string outputdir, Action <ProgressArgs> ProgressCallback, Action Complete)
{
var sourcestream = new FileStream(source, FileMode.Open, FileAccess.Read, FileShare.None);
var gz = new GZipStream(sourcestream, CompressionMode.Decompress);
var count = 0;
var namelen = 0;
var buffer = new byte[4096];
byte[] namebyte;
string name, upfolder;
var tag = new byte[4];
var lenbyte = new byte[8];
long filelen = 0;
while ((count = gz.Read(tag, 0, tag.Length)) > 0)
{
var memoryStream = new MemoryStream();
namelen = BitConverter.ToInt32(tag, 0);
namebyte = new byte[namelen];
gz.Read(namebyte, 0, namebyte.Length);
name = Encoding.Unicode.GetString(namebyte);
upfolder = outputdir + name.Substring(0, name.LastIndexOf("\\")); //上级目录的全路径
name = outputdir + name; //该文件的全路径
gz.Read(lenbyte, 0, lenbyte.Length);
filelen = BitConverter.ToInt64(lenbyte, 0);
var p = name.LastIndexOf("\\") + 1;
var pa = new ProgressArgs {
Description = "正在解压缩",
Position = 0,
PreFileName =
name.Substring(p, name.Length - p),
PreFileProgress = 0,
PreFileTotal = filelen,
Total = 0
};
memoryStream = new MemoryStream();
var terms = (int)filelen / 4096;
var tail = (int)filelen % 4096;
for (var i = 0; i < terms; ++i)
{
gz.Read(buffer, 0, buffer.Length);
pa.PreFileProgress += buffer.Length;
ProgressCallback(pa);
memoryStream.Write(buffer, 0, buffer.Length);
}
gz.Read(buffer, 0, tail);
pa.PreFileProgress += tail;
ProgressCallback(pa);
memoryStream.Write(buffer, 0, tail);
memoryStream.Seek(0, SeekOrigin.Begin);
if (!Directory.Exists(upfolder))
{
Directory.CreateDirectory(upfolder);
}
var fs = new FileStream(name, FileMode.Create, FileAccess.Write, FileShare.None);
memoryStream.CopyTo(fs);
fs.Flush();
fs.Close();
memoryStream.Close();
Complete();
}
gz.Close();
}