package proto

import (
	"io"
	"unsafe"
)

var boolCodec = codec{
	wire:   varint,
	size:   sizeOfBool,
	encode: encodeBool,
	decode: decodeBool,
}

func sizeOfBool(p unsafe.Pointer, flags flags) int {
	if p != nil && *(*bool)(p) || flags.has(wantzero) {
		return 1
	}
	return 0
}

func encodeBool(b []byte, p unsafe.Pointer, flags flags) (int, error) {
	if p != nil && *(*bool)(p) || flags.has(wantzero) {
		if len(b) == 0 {
			return 0, io.ErrShortBuffer
		}
		b[0] = 1
		return 1, nil
	}
	return 0, nil
}

func decodeBool(b []byte, p unsafe.Pointer, _ flags) (int, error) {
	if len(b) == 0 {
		return 0, io.ErrUnexpectedEOF
	}
	*(*bool)(p) = b[0] != 0
	return 1, nil
}