io.go

package minequery

import (
	"bytes"
	"io"

	"golang.org/x/text/encoding/unicode"
)

var (
	utf16BEEncoder = unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM).NewEncoder()
	utf16BEDecoder = unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM).NewDecoder()
)

// readAllUntilZero reads all bytes from reader until it hits zero.
// This is a backport from newer Go stdlib for sake of minequery's compatibility with Go 1.13.
func readAllUntilZero(reader io.ByteReader) ([]byte, error) {
	buf := &bytes.Buffer{}

	for {
		b, err := reader.ReadByte()
		if err != nil {
			if err == io.EOF {
				return buf.Bytes(), nil
			}
			return nil, err
		}

		if b != 0 {
			buf.WriteByte(b)
		} else {
			return buf.Bytes(), nil
		}
	}
}

// readAll reads all bytes from reader.
// This is a backport from newer Go stdlib for sake of minequery's compatibility with Go 1.13.
func readAll(r io.Reader) ([]byte, error) {
	b := make([]byte, 0, 512)
	for {
		n, err := r.Read(b[len(b):cap(b)])
		b = b[:len(b)+n]
		if err != nil {
			if err == io.EOF {
				err = nil
			}
			return b, err
		}

		if len(b) == cap(b) {
			// Add more capacity (let append pick how much).
			b = append(b, 0)[:len(b)]
		}
	}
}