/// <summary>
/// Creates the file.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="fileMode">The file mode.</param>
/// <param name="hash">The hash.</param>
/// <param name="size">The size.</param>
/// <param name="allowExternal">if set to <c>true</c> [allow external].</param>
/// <returns></returns>
public Stream OpenFile(string path, FileMode fileMode, string hash, long size, bool allowExternal)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
string fullPath = QQnPath.CombineFullPath(_directory, path);
path = QQnPath.MakeRelativePath(_directory, fullPath);
switch (fileMode)
{
case FileMode.CreateNew:
case FileMode.Create:
if (!allowExternal && File.Exists(fullPath))
{
throw new IOException(string.Format(CultureInfo.InvariantCulture, "Unmanaged file {0} exists", path));
}
break;
case FileMode.Open:
case FileMode.Truncate:
if (!_data.Files.Contains(path) && (!allowExternal || !File.Exists(path)))
{
throw new IOException("File does not exist");
}
break;
default:
throw new ArgumentException("The specified mode is not supported");
}
if (size < 0)
{
size = -1;
}
CreateDirectory(Path.GetDirectoryName(fullPath));
DirectoryMapFile file = DoGetFile(path);
if (file.ToBeDeleted && (fileMode == FileMode.Create || fileMode == FileMode.CreateNew))
{
file.ToBeDeleted = false;
}
return(new DirectoryMapStream(File.Open(fullPath, fileMode), file, fileMode, hash, string.IsNullOrEmpty(hash) ? -1 : size, _data.HashType));
}
