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types.go
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types.go
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// Package dynbt is a library that provides dynamic NBT operation APIs.
//
// Dynamically represented NBT value is useful in many cases, for example,
// - You want to store custom structural values at runtime.
// - You want to query or modify the data later. (Otherwise use the [nbt.RawMessage])
// - You don't know what type the data is at compile time. (Otherwise use the [nbt.RawMessage] too)
//
// The [*Value] provides a group of APIs on top of the [nbt] package.
// [*Value] implements [nbt.Marshaler] and [nbt.Unmarshaler] interfaces.
// It can be used as a field of struct, or element of slice, map, etc.
// The pointer type should always be used, unless used as fields for structures
//
// Notice that querying Tags in Compound use a linear search, so it's not recommended to use it in a large Compound.
// The better choice is map[string]*Value for dynamic accessing a large Compound.
//
// This package tries its best to not copy data if possible.
// It returns the underlying data in some cases. Don't modify them!
package dynbt
import (
"encoding/binary"
"math"
"github.com/maxsupermanhd/go-vmc/v764/nbt"
)
type Value struct {
comp Compound
list []*Value
data []byte
tag byte // nbt.Tag*
}
func NewBoolean(v bool) *Value {
data := byte(0)
if v {
data = 1
}
return &Value{tag: nbt.TagByte, data: []byte{data}}
}
func NewByte(v int8) *Value {
return &Value{tag: nbt.TagByte, data: []byte{byte(v)}}
}
func NewShort(v int16) *Value {
data := make([]byte, 2)
binary.BigEndian.PutUint16(data, uint16(v))
return &Value{tag: nbt.TagShort, data: data}
}
func NewInt(v int32) *Value {
data := make([]byte, 4)
binary.BigEndian.PutUint32(data, uint32(v))
return &Value{tag: nbt.TagInt, data: data}
}
func NewLong(v int64) *Value {
data := make([]byte, 8)
binary.BigEndian.PutUint64(data, uint64(v))
return &Value{tag: nbt.TagLong, data: data}
}
func NewFloat(f float32) *Value {
data := make([]byte, 4)
binary.BigEndian.PutUint32(data, math.Float32bits(f))
return &Value{tag: nbt.TagFloat, data: data}
}
func NewDouble(d float64) *Value {
data := make([]byte, 8)
binary.BigEndian.PutUint64(data, math.Float64bits(d))
return &Value{tag: nbt.TagDouble, data: data}
}
func NewByteArray(v []byte) *Value {
data := make([]byte, 4, 4+len(v))
binary.BigEndian.PutUint32(data, uint32(len(v)))
return &Value{tag: nbt.TagByteArray, data: append(data, v...)}
}
func NewIntArray(v []int32) *Value {
data := make([]byte, 4+len(v)*4)
binary.BigEndian.PutUint32(data, uint32(len(v)))
for i, j := 0, 4; i < len(v); i, j = i+1, j+4 {
binary.BigEndian.PutUint32(data[j:], uint32(v[i]))
}
return &Value{tag: nbt.TagIntArray, data: data}
}
func NewLongArray(v []int64) *Value {
data := make([]byte, 4+len(v)*8)
binary.BigEndian.PutUint32(data, uint32(len(v)))
for i, j := 0, 4; i < len(v); i, j = i+1, j+8 {
binary.BigEndian.PutUint64(data[j:], uint64(v[i]))
}
return &Value{tag: nbt.TagLongArray, data: data}
}
func NewString(str string) *Value {
data := make([]byte, 2, 2+len(str))
binary.BigEndian.PutUint16(data, uint16(len(str)))
return &Value{tag: nbt.TagString, data: append(data, str...)}
}
func NewList(elems ...*Value) *Value {
return &Value{tag: nbt.TagList, list: elems}
}
func NewCompound() *Value {
return &Value{tag: nbt.TagCompound}
}
func (v *Value) Boolean() bool {
if v.tag != nbt.TagByte {
return false
}
return v.data[0] != 0
}
func (v *Value) Byte() int8 {
if v.tag != nbt.TagByte {
return 0
}
return int8(v.data[0])
}
func (v *Value) Short() int16 {
if v.tag != nbt.TagShort {
return 0
}
return int16(binary.BigEndian.Uint16(v.data))
}
func (v *Value) Int() int32 {
if v.tag != nbt.TagInt {
return 0
}
return int32(binary.BigEndian.Uint32(v.data))
}
func (v *Value) Long() int64 {
if v.tag != nbt.TagLong {
return 0
}
return int64(binary.BigEndian.Uint64(v.data))
}
func (v *Value) Float() float32 {
if v.tag != nbt.TagFloat {
return float32(math.NaN())
}
return math.Float32frombits(binary.BigEndian.Uint32(v.data))
}
func (v *Value) Double() float64 {
if v.tag != nbt.TagDouble {
return math.NaN()
}
return math.Float64frombits(binary.BigEndian.Uint64(v.data))
}
func (v *Value) List() []*Value {
if v.tag != nbt.TagList {
return nil
}
return v.list
}
func (v *Value) Compound() *Compound {
if v.tag != nbt.TagCompound {
return nil
}
return &v.comp
}
func (v *Value) ByteArray() []byte {
if v.tag != nbt.TagByteArray {
return nil
}
return v.data[4:]
}
func (v *Value) IntArray() []int32 {
if v.tag != nbt.TagIntArray {
return nil
}
length := binary.BigEndian.Uint32(v.data)
ret := make([]int32, length)
for i, j := uint32(0), 4; i < length; i, j = i+1, j+4 {
ret[i] = int32(binary.BigEndian.Uint32(v.data[j:]))
}
return ret
}
func (v *Value) LongArray() []int64 {
if v.tag != nbt.TagLongArray {
return nil
}
length := binary.BigEndian.Uint32(v.data)
ret := make([]int64, length)
for i, j := uint32(0), 4; i < length; i, j = i+1, j+8 {
ret[i] = int64(binary.BigEndian.Uint64(v.data[j:]))
}
return ret
}
func (v *Value) String() string {
if v.tag != nbt.TagString {
return ""
}
return string(v.data[2:])
}
type Compound struct {
kvs []kv
}
type kv struct {
tag string
v *Value
}