Ext will retrieve a non-compression related file extension.

NewCloseBuf returns an instance of CloseBuf.

OpenTmp will open and create a temp file It will create necessary directories.

ParsePath will parse a path of the form: "{scheme}://{host}/{path/to/file.txt} and return the scheme, host and file path.

RmTmp will remove a local tmp file.

CloseBuf is a bytes.Buffer with a Close method.

HashReader executes the underlying reader Read call and will write the read bytes into the hasher.

NopCloser will turn a Writer into an io.WriteCloser Write will call the original write Write method.