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read.go
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read.go
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package nbt
import (
"encoding/binary"
"errors"
"io"
)
func readByte(reader io.Reader) (interface{}, error) {
b := []byte{0x00}
_, err := reader.Read(b)
return b[0], err
}
func binaryRead(r io.Reader, s interface{}) error {
return binary.Read(r, binary.BigEndian, s)
}
func readShort(r io.Reader) (interface{}, error) {
s := int16(0x00)
err := binaryRead(r, &s)
return s, err
}
func readInt(r io.Reader) (interface{}, error) {
i := int32(0x00)
err := binaryRead(r, &i)
return i, err
}
func readLong(r io.Reader) (interface{}, error) {
l := int64(0x00)
err := binaryRead(r, &l)
return l, err
}
func readFloat(r io.Reader) (interface{}, error) {
l := float32(0x00)
err := binaryRead(r, &l)
return l, err
}
func readDouble(r io.Reader) (interface{}, error) {
l := float64(0x00)
err := binaryRead(r, &l)
return l, err
}
func readByteArray(r io.Reader) (interface{}, error) {
length, err := readInt(r)
l := length.(int32)
if err != nil {
return nil, err
}
buf := make([]byte, int(l))
_, err = io.ReadFull(r, buf)
return buf, err
}
func readString(r io.Reader) (interface{}, error) {
length, err := readShort(r)
if err != nil {
return nil, err
}
l := uint16(length.(int16))
buf := make([]byte, int(l))
_, err = io.ReadFull(r, buf)
return string(buf), err
}
func readIntArray(r io.Reader) (interface{}, error) {
length, err := readInt(r)
if err != nil {
return nil, err
}
l := length.(int32)
buf := make([]int32, l)
for i := range buf {
var v interface{}
v, err = readInt(r)
if err != nil {
return buf, err
}
buf[i] = v.(int32)
}
return buf, err
}
func readLongArray(r io.Reader) (interface{}, error) {
length, err := readInt(r)
if err != nil {
return nil, err
}
l := length.(int32)
buf := make([]int64, l)
for i := range buf {
var v interface{}
v, err = readLong(r)
if err != nil {
return buf, err
}
buf[i] = v.(int64)
}
return buf, err
}
func readCompound(r io.Reader) (interface{}, error) {
out := make(Compound)
var err error
for {
v, err := readByte(r)
if err != nil {
break
}
id := v.(byte)
rf := readFuncFactory(tagID(id))
if rf == nil {
// TagEnd
break
}
v, err = compoundWrapRead(rf)(r)
if err != nil {
break
}
field := v.(compoundField)
out[field.name] = field.value
}
return out, err
}
type compoundField struct {
name string
value interface{}
}
func compoundWrapRead(rf readFunc) readFunc {
return func(r io.Reader) (interface{}, error) {
n, err := readString(r)
if err != nil {
return nil, err
}
name := n.(string)
v, err := rf(r)
if err != nil {
return nil, err
}
return compoundField{
name: name,
value: v,
}, nil
}
}
func readList(r io.Reader) (interface{}, error) {
v, err := readByte(r)
if err != nil {
return nil, err
}
id := v.(byte)
rf := readFuncFactory(tagID(id))
v, err = readInt(r)
if err != nil {
return nil, err
}
length := v.(int32)
if length != 0 && rf == nil {
return nil, errors.New("rf can't be nil if length isn't 0")
}
list := make([]interface{}, length)
for i := range list {
v, err := rf(r)
if err != nil {
break
}
list[i] = v
}
return list, err
}