func (s *stack) Write(bytes []byte) (n int, err error) {
// Write the given bytes into the stack such that the first byte is on
// the top of the stack
(*s) = append(*s, bytes...)
vbytes.Reverse((*s)[len(*s)-len(bytes):])
return len(bytes), nil
}
func (s *stack) Read(bytes []byte) (n int, err error) {
// Read back bytes from the stack such that the first byte read is from
// the top of the stack
to_read := len(bytes)
if to_read > len(*s) {
to_read = len(*s)
}
copy(bytes, (*s)[len(*s)-to_read:])
*s = (*s)[:len(*s)-to_read]
vbytes.Reverse(bytes)
return
}