// readFile reads an arbitrary file into a buffer.
func readFile(filename string, buf *bytes.Buffer) (int64, error) {
f, err := fs.Open(filename)
if err != nil {
return -1, err
}
defer f.Close()
return buf.ReadFrom(f)
}
func (p dir) Open(path string) (io.ReadWriteCloser, error) {
if path == "/" {
return nil, fmt.Errorf("I'm a directory!")
}
head, tail := split(path)
fs, ok := p.entries[head]
if !ok {
return nil, fmt.Errorf("Not found: %s", path)
}
return fs.Open(tail)
}