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using System;
using System.Collections.Generic;
namespace mooftpserv
{
public class FileSystemHelper
{
/// Handles TVFS path resolution, similar to Path.GetFullPath(Path.Combine(basePath, path))
public static string ResolvePath(string basePath, string path)
{
// CF is missing String.IsNullOrWhiteSpace
if (path == null || path.Trim() == "")
return null;
// first, make a complete unix path
string fullPath;
if (path[0] == '/') {
fullPath = path;
} else {
fullPath = basePath;
if (!fullPath.EndsWith("/"))
fullPath += "/";
fullPath += path;
}
// then, remove ".." and "."
List<string> tokens = new List<string>(fullPath.Split('/'));
for (int i = 0; i < tokens.Count; ++i) {
if (tokens[i] == "") {
if (i == 0 || i == tokens.Count - 1) {
continue; // ignore, start and end should be empty tokens
} else {
tokens.RemoveAt(i);
--i;
}
} else if (tokens[i] == "..") {
if (i < 2) {
// cannot go higher than root, just remove the token
tokens.RemoveAt(i);
--i;
} else {
tokens.RemoveRange(i - 1, 2);
i -= 2;
}
} else if (i < tokens.Count - 1 && tokens[i].EndsWith(@"\")) {
int slashes = 0;
for (int c = tokens[i].Length - 1; c >= 0 && tokens[i][c] == '\\'; --c)
++slashes;
if (slashes % 2 != 0) {
// the slash was actually escaped, merge tokens
tokens[i] += ("/" + tokens[i + 1]);
++i;
}
}
}
if (tokens.Count > 1)
return String.Join("/", tokens.ToArray());
else
return "/";
}
}
}
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