Function ReadMapHeaderBytes

msgp/read_bytes.go:163–201

ReadMapHeaderBytes reads a map header size from 'b' and returns the remaining bytes. Possible errors: - [ErrShortBytes] (too few bytes) - [TypeError] (not a map)

(b []byte)

//   - [ErrShortBytes] (too few bytes)
//   - [TypeError] (not a map)
func ReadMapHeaderBytes(b []byte) (sz uint32, o []byte, err error) {
	l := len(b)
	if l < 1 {
		err = ErrShortBytes
		return
	}

	lead := b[0]
	b = b[1:]
	if isfixmap(lead) {
		sz = uint32(rfixmap(lead))
		o = b
		return
	}

	switch lead {
	case mmap16:
		if len(b) < 2 {
			err = ErrShortBytes
			return
		}
		sz = uint32(big.Uint16(b))
		o = b[2:]
		return

	case mmap32:
		if len(b) < 4 {
			err = ErrShortBytes
			return
		}
		sz = big.Uint32(b)
		o = b[4:]
		return

	default:
		err = badPrefix(MapType, lead)
		return
	}
}

// ReadMapKeyZC attempts to read a map key
// from 'b' and returns the key bytes and the remaining bytes