//通过起始位置找到内部文件;
public static IFile GetInnerFileByPosition(this IIterableFile iterable, long pos)
{
if (iterable == null || iterable.Children == null)
{
return(null);
}
foreach (var item in iterable.Children)
{
if (item is RegularFile)
{
if ((item as RegularFile).StartLBA == pos)
{
return(item);
}
}
else if (item is IIterableFile)
{
var itera = (item as IIterableFile);
if (!(itera.IsBackFile() || itera.IsBackUpFile()))
{
IFile innerFile = null;
if ((innerFile = GetInnerFileByPosition(itera, pos)) != null)
{
return(innerFile);
}
}
}
}
return(null);
}
//得到内部文件的总大小;
public static long GetTotalSize(this IIterableFile file)
{
if (file.Children != null)
{
long sum = 0;
TraverseAddNum(file, ref sum);
return(sum);
}
return(0);
}
/// <summary>
/// 判定是否为上级文件(..);
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public static bool IsBackFile(this IIterableFile dir)
{
if (dir == null)
{
return(false);
}
return(dir.Name == "..");
//return dir.Children != null &&
// dir.Children.Count != 0 &&
// dir.Children.Contains(dir.Parent);
}
/// <summary>
///
/// </summary>
/// <param name="itrFile"></param>
/// <returns></returns>
public static int IndexOf(this IIterableFile itrFile, IFile file)
{
if (itrFile == null && itrFile.Children == null)
{
return(-1);
}
var idx = 0;
foreach (var item in itrFile.Children)
{
if (item == file)
{
return(idx);
}
idx++;
}
return(-1);
}
private static void TraverseAddNum(IIterableFile file, ref long sum)
{
foreach (var p in file.Children)
{
if (p.Type == FileType.Directory)
{
var direc = p as Abstracts.Directory;
if (direc?.Deleted == false)
{
if (direc.Name != ".." && direc.Name != ".")
{
TraverseAddNum(direc, ref sum);
}
}
}
else if (p.Type == FileType.RegularFile)
{
sum += p.Size;
}
}
}
/// <summary>
/// 通过Url参数获得子文件;
/// </summary>
/// <param name="part"></param>
/// <param name="urlArgs"></param>
/// <returns></returns>
public static IFile GetFileByUrl(this Partition part, string[] urlArgs)
{
if (urlArgs == null)
{
return(null);
}
if (urlArgs.Length == 1 && string.IsNullOrEmpty(urlArgs[0]))
{
return(part);
}
IIterableFile fileNode = part;
for (int index = 0; index < urlArgs.Length - 1; index++)
{
if (fileNode == null)
{
throw new FileNotFoundException($"Can't find file {urlArgs[index]}-{urlArgs.Aggregate((a,b) => $"{a}/{b}")}");
}
fileNode = fileNode.Children.FirstOrDefault(p => p.Name == urlArgs[index]) as IIterableFile;
}
return(fileNode.Children.FirstOrDefault(p => p.Name == urlArgs[urlArgs.Length - 1]));
}
