/
writer.go
226 lines (189 loc) · 4.63 KB
/
writer.go
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package minecraft
import (
"bytes"
"encoding/binary"
"encoding/json"
"github.com/google/uuid"
"log"
)
type Writer struct {
bytes.Buffer
}
func (writer *Writer) Bytes() []byte {
return writer.Buffer.Bytes()[:writer.Buffer.Len()]
}
func (writer *Writer) WriteBytes(data []byte) {
writer.Buffer.Write(data)
}
func (writer *Writer) WriteBoolean(val bool) {
if val {
writer.WriteByte(0x01)
} else {
writer.WriteByte(0x00)
}
}
func (writer *Writer) WriteByte(val byte) {
writer.Buffer.WriteByte(val)
}
func (writer *Writer) WriteShort(val int16) {
writer.Grow(2)
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteUShort(val uint16) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteInt(val int32) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteUInt(val uint32) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteLong(val int64) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteULong(val uint64) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteFloat(val float32) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteDouble(val float64) {
_ = binary.Write(&writer.Buffer, binary.BigEndian, val)
}
func (writer *Writer) WriteString(val string) {
writer.WriteVarint(int32(len(val)))
writer.Buffer.WriteString(val)
}
func (writer *Writer) WriteChat(val Chat) {
b := val.ToJSON()
writer.WriteVarint(int32(len(b)))
writer.WriteBytes(b)
}
func (writer *Writer) WriteJson(val interface{}) {
b, err := json.Marshal(val)
if err != nil {
log.Panicln(err)
}
writer.WriteVarint(int32(len(b)))
writer.WriteBytes(b)
}
// TODO: writeIdentifier
func (writer *Writer) WriteVarint(val int32) {
raw := uint32(val)
for {
temp := byte(raw & 0b01111111)
raw >>= 7
if raw != 0 {
temp |= 0b10000000
}
writer.WriteByte(temp)
if raw == 0 {
break
}
}
}
func (writer *Writer) WriteVarlong(val int64) {
raw := uint64(val)
for {
temp := byte(raw & 0b01111111)
raw >>= 7
if raw != 0 {
temp |= 0b10000000
}
writer.WriteByte(temp)
if raw == 0 {
break
}
}
}
// TODO: entity metaData
// TODO: SLot
func (writer *Writer) WritePosition(pos Position) {
writer.WriteULong(pos.Pack())
}
func (writer *Writer) WriteAngle(angle Angle) {
writer.WriteByte(byte(angle))
}
func (writer *Writer) WriteUUID(val uuid.UUID) {
b, _ := val.MarshalBinary()
writer.WriteBytes(b)
}
func (writer *Writer) WriteUUIDAsString(val uuid.UUID) {
b, _ := val.MarshalText()
writer.WriteVarint(int32(len(b)))
writer.WriteBytes(b)
}
func (writer *Writer) StartNBT() NbtWriter {
return NbtWriter{
w: writer,
hierarchy: []uint8{},
listSizeStack: []int{},
listSizeOffsetStack: []int{},
}
}
func (writer *Writer) StartEntityMetadata() *EntityMetadataWriter {
return &EntityMetadataWriter{
writer,
}
}
type EntityMetadataWriter struct {
w *Writer
}
type Pose int32
const (
PoseStanding = Pose(0)
PoseFallFlying = Pose(1)
PoseSleeping = Pose(2)
PoseSwimming = Pose(3)
PoseSpinAttack = Pose(4)
PoseSneaking = Pose(5)
PoseDying = Pose(6)
)
func (writer *EntityMetadataWriter) WriteByte(index byte, val byte) {
writer.w.WriteByte(index)
writer.w.WriteVarint(0)
writer.w.WriteByte(val)
}
func (writer *EntityMetadataWriter) WriteVarint(index byte, val int32) {
writer.w.WriteByte(index)
writer.w.WriteVarint(1)
writer.w.WriteVarint(val)
}
func (writer *EntityMetadataWriter) WriteFloat(index byte, val float32) {
writer.w.WriteByte(index)
writer.w.WriteVarint(2)
writer.w.WriteFloat(val)
}
func (writer *EntityMetadataWriter) WriteString(index byte, val string) {
writer.w.WriteByte(index)
writer.w.WriteVarint(3)
writer.w.WriteString(val)
}
func (writer *EntityMetadataWriter) WriteBoolean(index byte, val bool) {
writer.w.WriteByte(index)
writer.w.WriteVarint(6)
writer.w.WriteBoolean(val)
}
func (writer *EntityMetadataWriter) WritePosition(index byte, val Position) {
writer.w.WriteByte(index)
writer.w.WriteVarint(8)
writer.w.WritePosition(val)
}
func (writer *EntityMetadataWriter) StartNBT(index byte) NbtWriter {
writer.w.WriteByte(index)
writer.w.WriteVarint(13)
return NbtWriter{
w: writer.w,
hierarchy: []uint8{},
listSizeStack: []int{},
listSizeOffsetStack: []int{},
}
}
func (writer *EntityMetadataWriter) WritePose(index byte, val Pose) {
writer.w.WriteByte(index)
writer.w.WriteVarint(18)
writer.w.WriteVarint(int32(val))
}
func (writer *EntityMetadataWriter) Done() {
writer.w.WriteByte(0xFF)
}