87 lines
1.6 KiB
Go
87 lines
1.6 KiB
Go
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package types
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import (
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"bufio"
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"encoding/binary"
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"errors"
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)
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func DecodeBits(r *bufio.Reader) ([8]bool, error) {
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bitflags, err := r.ReadByte()
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if err != nil {
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return [8]bool{}, err
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}
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var res [8]bool
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for i := range res {
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res[i] = (bitflags>>i)&1 == 1
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}
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return res, nil
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}
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func DecodeUint16(r *bufio.Reader) (uint16, error) {
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buf := make([]byte, 2)
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_, err := r.Read(buf)
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if err != nil {
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return 0, err
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}
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return binary.BigEndian.Uint16(buf), nil
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}
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func DecodeUint32(r *bufio.Reader) (uint32, error) {
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buf := make([]byte, 4)
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_, err := r.Read(buf)
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if err != nil {
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return 0, err
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}
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return binary.BigEndian.Uint32(buf), nil
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}
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func DecodeDataWithVarIntLen(r *bufio.Reader) ([]byte, error) {
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len, err := DecodeVariableByteInt(r)
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if err != nil {
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return []byte{}, err
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}
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buffer := make([]byte, len)
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_, err = r.Read(buffer)
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return buffer, err
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}
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func DecodeBinaryData(r *bufio.Reader) ([]byte, error) {
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len, err := DecodeUint16(r)
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if err != nil {
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return []byte{}, err
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}
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buffer := make([]byte, len)
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_, err = r.Read(buffer)
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return buffer, err
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}
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func DecodeUTF8String(r *bufio.Reader) (string, error) {
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binary, err := DecodeBinaryData(r)
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return string(binary[:]), err
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}
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func DecodeVariableByteInt(r *bufio.Reader) (value uint32, err error) {
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multiplier := uint32(1)
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value = 0
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for {
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encodedByte, err := r.ReadByte()
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if err != nil {
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return value, err
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}
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value += uint32((encodedByte & 127)) * multiplier
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if multiplier > 128*128*128 {
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return value, errors.New("Malformed Variable Byte Integer")
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}
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multiplier *= 128
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if encodedByte&128 == 0 {
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break
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}
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}
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return value, nil
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}
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