/
io.go
160 lines (137 loc) · 2.83 KB
/
io.go
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package protocol
import (
"encoding/json"
"io"
"math"
"github.com/gitfyu/mable/chat"
)
// Reader combines all interfaces needed to be able to
// read any datatype in the Minecraft protocol.
type Reader interface {
io.Reader
io.ByteReader
}
// Writer combines all interfaces needed to be able to
// write any datatype in the Minecraft protocol.
type Writer interface {
io.Writer
io.ByteWriter
io.StringWriter
}
func ReadBool(r io.ByteReader) (bool, error) {
b, err := r.ReadByte()
return b != 0, err
}
func ReadUint16(r io.Reader) (uint16, error) {
var b [2]byte
_, err := r.Read(b[:])
return uint16(b[1]) | uint16(b[0])<<8, err
}
func ReadUint32(r io.Reader) (uint32, error) {
var b [4]byte
_, err := r.Read(b[:])
return uint32(b[3]) |
uint32(b[2])<<8 |
uint32(b[1])<<16 |
uint32(b[0])<<24, err
}
func ReadUint64(r io.Reader) (uint64, error) {
var b [8]byte
_, err := r.Read(b[:])
return uint64(b[7]) |
uint64(b[6])<<8 |
uint64(b[5])<<16 |
uint64(b[4])<<24 |
uint64(b[3])<<32 |
uint64(b[2])<<40 |
uint64(b[1])<<48 |
uint64(b[0])<<56, err
}
func ReadFloat32(r io.Reader) (float32, error) {
v, err := ReadUint32(r)
return math.Float32frombits(v), err
}
func ReadFloat64(r io.Reader) (float64, error) {
v, err := ReadUint64(r)
return math.Float64frombits(v), err
}
func ReadString(r Reader) (string, error) {
// TODO cap maximum length
len, err := ReadVarInt(r)
if err != nil {
return "", err
}
b := make([]byte, len)
if _, err = r.Read(b); err != nil {
return "", err
}
return string(b), nil
}
func WriteBool(w io.ByteWriter, v bool) error {
var err error
if v {
err = w.WriteByte(1)
} else {
err = w.WriteByte(0)
}
return err
}
func WriteUint16(w io.Writer, v uint16) error {
b := [2]byte{
byte(v >> 8),
byte(v),
}
_, err := w.Write(b[:])
return err
}
func WriteUint32(w io.Writer, v uint32) error {
b := [4]byte{
byte(v >> 24),
byte(v >> 16),
byte(v >> 8),
byte(v),
}
_, err := w.Write(b[:])
return err
}
func WriteUint64(w io.Writer, v uint64) error {
b := [8]byte{
byte(v >> 56),
byte(v >> 48),
byte(v >> 40),
byte(v >> 32),
byte(v >> 24),
byte(v >> 16),
byte(v >> 8),
byte(v),
}
_, err := w.Write(b[:])
return err
}
func WriteFloat32(w io.Writer, v float32) error {
return WriteUint32(w, math.Float32bits(v))
}
func WriteFloat64(w io.Writer, v float64) error {
return WriteUint64(w, math.Float64bits(v))
}
func WriteString(w Writer, s string) error {
if err := WriteVarInt(w, int32(len(s))); err != nil {
return err
}
_, err := w.WriteString(s)
return err
}
func WriteByteArray(w Writer, b []byte) error {
if err := WriteVarInt(w, int32(len(b))); err != nil {
return err
}
_, err := w.Write(b)
return err
}
func WriteChat(w Writer, v *chat.Msg) error {
str, err := json.Marshal(v)
if err != nil {
return err
}
return WriteByteArray(w, str)
}