/
entity_metadata.go
144 lines (140 loc) · 3.85 KB
/
entity_metadata.go
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package protocol
import (
"bytes"
"encoding/binary"
"fmt"
"github.com/go-gl/mathgl/mgl32"
"github.com/sandertv/gophertunnel/minecraft/nbt"
)
const (
EntityDataByte = iota
EntityDataInt16
EntityDataInt32
EntityDataFloat32
EntityDataString
EntityDataCompoundTag
EntityDataBlockPos
EntityDataInt64
EntityDataVec3
)
// EntityMetadata reads an entity metadata list from buffer src into map x. The types in the map will be one
// of byte, int16, int32, float32, string, map[string]interface{}, BlockPos, int64 or mgl32.Vec3.
func EntityMetadata(src *bytes.Buffer, x *map[uint32]interface{}) error {
var count uint32
var err error
if err = Varuint32(src, &count); err != nil {
return wrap(err)
}
if count > mediumLimit {
return LimitHitError{Limit: mediumLimit, Type: "entity metadata"}
}
for i := uint32(0); i < count; i++ {
var key, dataType uint32
if err = Varuint32(src, &key); err != nil {
return wrap(err)
}
if err = Varuint32(src, &dataType); err != nil {
return wrap(err)
}
switch dataType {
case EntityDataByte:
var v byte
err = binary.Read(src, binary.LittleEndian, &v)
(*x)[key] = v
case EntityDataInt16:
var v int16
err = binary.Read(src, binary.LittleEndian, &v)
(*x)[key] = v
case EntityDataInt32:
var v int32
err = Varint32(src, &v)
(*x)[key] = v
case EntityDataFloat32:
var v float32
err = Float32(src, &v)
(*x)[key] = v
case EntityDataString:
var v string
err = String(src, &v)
(*x)[key] = v
case EntityDataCompoundTag:
var v map[string]interface{}
err = nbt.NewDecoder(src).Decode(&v)
(*x)[key] = v
case EntityDataBlockPos:
var v BlockPos
err = BlockPosition(src, &v)
(*x)[key] = v
case EntityDataInt64:
var v int64
err = Varint64(src, &v)
(*x)[key] = v
case EntityDataVec3:
var v mgl32.Vec3
err = Vec3(src, &v)
(*x)[key] = v
default:
return fmt.Errorf("unknown entity data type %v", dataType)
}
if err != nil {
// If the error from reading the entity data property was not nil, we return right away.
return wrap(err)
}
}
return nil
}
// WriteEntityMetadata writes an entity metadata list x to buffer dst. The types held by the map must be one
// of byte, int16, int32, float32, string, map[string]interface{}, BlockPos, int64 or mgl32.Vec3. The function
// will panic if a different type is encountered.
func WriteEntityMetadata(dst *bytes.Buffer, x map[uint32]interface{}) error {
if x == nil {
return WriteVaruint32(dst, 0)
}
if err := WriteVaruint32(dst, uint32(len(x))); err != nil {
return wrap(err)
}
for key, value := range x {
if err := WriteVaruint32(dst, key); err != nil {
return wrap(err)
}
var typeErr, valueErr error
switch v := value.(type) {
case byte:
typeErr = WriteVaruint32(dst, EntityDataByte)
valueErr = binary.Write(dst, binary.LittleEndian, v)
case int16:
typeErr = WriteVaruint32(dst, EntityDataInt16)
valueErr = binary.Write(dst, binary.LittleEndian, v)
case int32:
typeErr = WriteVaruint32(dst, EntityDataInt32)
valueErr = WriteVarint32(dst, v)
case float32:
typeErr = WriteVaruint32(dst, EntityDataFloat32)
valueErr = WriteFloat32(dst, v)
case string:
typeErr = WriteVaruint32(dst, EntityDataString)
valueErr = WriteString(dst, v)
case map[string]interface{}:
typeErr = WriteVaruint32(dst, EntityDataCompoundTag)
valueErr = nbt.NewEncoder(dst).Encode(v)
case BlockPos:
typeErr = WriteVaruint32(dst, EntityDataBlockPos)
valueErr = WriteBlockPosition(dst, v)
case int64:
typeErr = WriteVaruint32(dst, EntityDataInt64)
valueErr = WriteVarint64(dst, v)
case mgl32.Vec3:
typeErr = WriteVaruint32(dst, EntityDataVec3)
valueErr = WriteVec3(dst, v)
default:
panic(fmt.Sprintf("invalid entity metadata value type %T", value))
}
if typeErr != nil {
return wrap(typeErr)
}
if valueErr != nil {
return wrap(valueErr)
}
}
return nil
}