v2ray-core/common/serial/serial.go

package serial

import (
	"encoding/binary"
	"io"
)

// ReadUint16 reads first two bytes from the reader, and then coverts them to an uint16 value.
func ReadUint16(reader io.Reader) (uint16, error) {
	var b [2]byte
	if _, err := io.ReadFull(reader, b[:]); err != nil {
		return 0, err
	}
	return binary.BigEndian.Uint16(b[:]), nil
}

// WriteUint16 writes an uint16 value into writer.
func WriteUint16(writer io.Writer, value uint16) (int, error) {
	var b [2]byte
	binary.BigEndian.PutUint16(b[:], value)
	return writer.Write(b[:])
}

// WriteUint32 writes an uint32 value into writer.
func WriteUint32(writer io.Writer, value uint32) (int, error) {
	var b [4]byte
	binary.BigEndian.PutUint32(b[:], value)
	return writer.Write(b[:])
}

// WriteUint64 writes an uint64 value into writer.
func WriteUint64(writer io.Writer, value uint64) (int, error) {
	var b [8]byte
	binary.BigEndian.PutUint64(b[:], value)
	return writer.Write(b[:])
}