/// <summary>
/// Opens the file using the specified options.
/// </summary>
/// <param name="fileMode">The file mode.</param>
/// <param name="fileAccess">The file access.</param>
/// <param name="fileShare">The file share.</param>
/// <returns>A <see cref="Stream" /> to the file.</returns>
public Stream Open(FileMode fileMode, FileAccess fileAccess, FileShare fileShare)
{
bool fileWasCreated;
var position = GetPosition(fileMode, out fileWasCreated);
if (fileWasCreated)
{
_tree.CreateFile(this);
}
return(new FakeFileStream(this)
{
Position = position
});
}
private long GetPosition(FileMode fileMode, out bool fileWasCreated)
{
fileWasCreated = false;
if (Exists)
{
switch (fileMode)
{
case FileMode.CreateNew:
throw new IOException();
case FileMode.Create:
case FileMode.Truncate:
Length = 0;
return(0);
case FileMode.Open:
case FileMode.OpenOrCreate:
return(0);
case FileMode.Append:
return(Length);
}
}
else
{
switch (fileMode)
{
case FileMode.Create:
case FileMode.Append:
case FileMode.CreateNew:
case FileMode.OpenOrCreate:
fileWasCreated = true;
Exists = true;
return(Length);
case FileMode.Open:
case FileMode.Truncate:
throw new FileNotFoundException();
}
}
throw new NotSupportedException();
}
public Stream Open(FileMode fileMode, FileAccess fileAccess, FileShare fileShare)
{
return(_file.Open((System.IO.FileMode)fileMode,
(System.IO.FileAccess)fileAccess,
(System.IO.FileShare)fileShare));
}
