AppendFile - appends the file "src" to the file "dst".

LimitedWriter takes an io.Writer and returns an ioutil.LimitWriter.

NewSkipReader - creates a SkipReader.

NopCloser returns a WriteCloser with a no-op Close method wrapping the provided Writer w.

WriteOnClose takes an io.Writer and returns an ioutil.WriteOnCloser.

LimitWriter implements io.WriteCloser.

SkipReader skips a given number of bytes and then returns all remaining data.

WriteOnCloser implements io.WriteCloser and always exectues at least one write operation if it is closed.