/// <summary>
/// 执行ZIP解压功能
/// </summary>
/// <param name="File">ZIP文件</param>
/// <returns>无</returns>
public static async Task ExtractZipAsync(FileSystemStorageFolder NewFolder, FileSystemStorageFile File, ProgressChangedEventHandler ProgressHandler = null)
{
using (FileStream BaseStream = await File.GetFileStreamFromFileAsync(AccessMode.Exclusive).ConfigureAwait(false))
using (ZipInputStream InputZipStream = new ZipInputStream(BaseStream))
{
BaseStream.Seek(0, SeekOrigin.Begin);
InputZipStream.IsStreamOwner = false;
long CurrentPosition = 0;
while (InputZipStream.GetNextEntry() is ZipEntry Entry)
{
if (!InputZipStream.CanDecompressEntry || Entry.IsCrypted)
{
throw new NotImplementedException();
}
if (Entry.Name.Contains("/"))
{
string[] SplitFolderPath = Entry.Name.Split('/', StringSplitOptions.RemoveEmptyEntries);
string TempFolderPath = NewFolder.Path;
for (int i = 0; i < SplitFolderPath.Length - 1; i++)
{
if (await FileSystemStorageItemBase.CreateAsync(Path.Combine(TempFolderPath, SplitFolderPath[i]), StorageItemTypes.Folder, CreateOption.OpenIfExist).ConfigureAwait(false) is FileSystemStorageFolder NextFolder)
{
TempFolderPath = NextFolder.Path;
}
else
{
throw new UnauthorizedAccessException("Could not create directory");
}
}
if (Entry.Name.Last() == '/')
{
if (await FileSystemStorageItemBase.CreateAsync(Path.Combine(TempFolderPath, SplitFolderPath.Last()), StorageItemTypes.Folder, CreateOption.OpenIfExist).ConfigureAwait(false) == null)
{
throw new UnauthorizedAccessException("Could not create directory");
}
}
else
{
if (await FileSystemStorageItemBase.CreateAsync(Path.Combine(TempFolderPath, SplitFolderPath.Last()), StorageItemTypes.File, CreateOption.GenerateUniqueName).ConfigureAwait(false) is FileSystemStorageFile NewFile)
{
using (FileStream NewFileStream = await NewFile.GetFileStreamFromFileAsync(AccessMode.Write).ConfigureAwait(false))
{
//For some files in Zip, CompressedSize or Size might less than zero, then we could not get progress by reading ZipInputStream.Length
if (Entry.CompressedSize > 0 && Entry.Size > 0)
{
await InputZipStream.CopyToAsync(NewFileStream, (s, e) =>
{
ProgressHandler?.Invoke(null, new ProgressChangedEventArgs(Convert.ToInt32((CurrentPosition + Convert.ToInt64(e.ProgressPercentage / 100d * Entry.CompressedSize)) * 100d / BaseStream.Length), null));
}).ConfigureAwait(false);
}
else
{
await InputZipStream.CopyToAsync(NewFileStream).ConfigureAwait(false);
}
}
}
else
{
throw new UnauthorizedAccessException();
}
}
}
else
{
if (await FileSystemStorageItemBase.CreateAsync(Path.Combine(NewFolder.Path, Entry.Name), StorageItemTypes.File, CreateOption.GenerateUniqueName).ConfigureAwait(false) is FileSystemStorageFile NewFile)
{
using (FileStream NewFileStream = await NewFile.GetFileStreamFromFileAsync(AccessMode.Write).ConfigureAwait(false))
{
//For some files in Zip, CompressedSize or Size might less than zero, then we could not get progress by reading ZipInputStream.Length
if (Entry.CompressedSize > 0 && Entry.Size > 0)
{
await InputZipStream.CopyToAsync(NewFileStream, (s, e) =>
{
ProgressHandler?.Invoke(null, new ProgressChangedEventArgs(Convert.ToInt32((CurrentPosition + Convert.ToInt64(e.ProgressPercentage / 100d * Entry.CompressedSize)) * 100d / BaseStream.Length), null));
}).ConfigureAwait(true);
}
else
{
await InputZipStream.CopyToAsync(NewFileStream).ConfigureAwait(false);
}
}
}
else
{
throw new UnauthorizedAccessException();
}
}
ProgressHandler?.Invoke(null, new ProgressChangedEventArgs(Convert.ToInt32((CurrentPosition = BaseStream.Position) * 100d / BaseStream.Length), null));
}
}
}
