/
string.go
63 lines (49 loc) · 1.24 KB
/
string.go
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package minecraft
import (
"encoding/binary"
"io"
"unicode/utf16"
)
type String string
func (m *String) ReadFrom(r io.Reader) (n int64, err error) {
var length uint16
// Read length of string, 2 bytes
err = binary.Read(r, binary.BigEndian, &length)
if err != nil {
return 0, err
}
// Read string, 2 bytes * length
var contents = make([]uint16, length)
err = binary.Read(r, binary.BigEndian, &contents)
if err != nil {
return 2, err
}
// Update String contents
*m = String(readString(contents))
return int64(2 + len(contents)*2), nil
}
func (m *String) WriteTo(w io.Writer) (n int64, err error) {
var contents = writeString(string(*m))
var length = uint16(len(contents))
// Read size of string inside a short
err = binary.Write(w, binary.BigEndian, length)
if err != nil {
return 0, err
}
err = binary.Write(w, binary.BigEndian, contents)
if err != nil {
return 2, err
}
return int64(2 + length*2), nil
}
func (m String) String() string {
return string(m)
}
// writeString encodes a Go string to UCS-2 (UTF-16).
func writeString(s string) []uint16 {
return utf16.Encode([]rune(s))
}
// readString decodes a UCS-2 (UTF-16) stream into a Go string.
func readString(u16 []uint16) string {
return string(utf16.Decode(u16))
}