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