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270 lines
5.1 KiB

package binary
import (
"encoding/binary"
"errors"
"io"
)
// Byte
func WriteByte(b byte, w io.Writer, n *int64, err *error) {
WriteTo([]byte{b}, w, n, err)
}
func ReadByte(r io.Reader, n *int64, err *error) byte {
buf := make([]byte, 1)
ReadFull(buf, r, n, err)
return buf[0]
}
// Int8
func WriteInt8(i int8, w io.Writer, n *int64, err *error) {
WriteByte(byte(i), w, n, err)
}
func ReadInt8(r io.Reader, n *int64, err *error) int8 {
return int8(ReadByte(r, n, err))
}
// Uint8
func WriteUint8(i uint8, w io.Writer, n *int64, err *error) {
WriteByte(byte(i), w, n, err)
}
func ReadUint8(r io.Reader, n *int64, err *error) uint8 {
return uint8(ReadByte(r, n, err))
}
// Int16
func WriteInt16(i int16, w io.Writer, n *int64, err *error) {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf, uint16(i))
*n += 2
WriteTo(buf, w, n, err)
}
func ReadInt16(r io.Reader, n *int64, err *error) int16 {
buf := make([]byte, 2)
ReadFull(buf, r, n, err)
return int16(binary.BigEndian.Uint16(buf))
}
// Uint16
func WriteUint16(i uint16, w io.Writer, n *int64, err *error) {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf, uint16(i))
*n += 2
WriteTo(buf, w, n, err)
}
func ReadUint16(r io.Reader, n *int64, err *error) uint16 {
buf := make([]byte, 2)
ReadFull(buf, r, n, err)
return uint16(binary.BigEndian.Uint16(buf))
}
// []Uint16
func WriteUint16s(iz []uint16, w io.Writer, n *int64, err *error) {
WriteUint32(uint32(len(iz)), w, n, err)
for _, i := range iz {
WriteUint16(i, w, n, err)
if *err != nil {
return
}
}
}
func ReadUint16s(r io.Reader, n *int64, err *error) []uint16 {
length := ReadUint32(r, n, err)
if *err != nil {
return nil
}
iz := make([]uint16, length)
for j := uint32(0); j < length; j++ {
ii := ReadUint16(r, n, err)
if *err != nil {
return nil
}
iz[j] = ii
}
return iz
}
// Int32
func WriteInt32(i int32, w io.Writer, n *int64, err *error) {
buf := make([]byte, 4)
binary.BigEndian.PutUint32(buf, uint32(i))
*n += 4
WriteTo(buf, w, n, err)
}
func ReadInt32(r io.Reader, n *int64, err *error) int32 {
buf := make([]byte, 4)
ReadFull(buf, r, n, err)
return int32(binary.BigEndian.Uint32(buf))
}
// Uint32
func WriteUint32(i uint32, w io.Writer, n *int64, err *error) {
buf := make([]byte, 4)
binary.BigEndian.PutUint32(buf, uint32(i))
*n += 4
WriteTo(buf, w, n, err)
}
func ReadUint32(r io.Reader, n *int64, err *error) uint32 {
buf := make([]byte, 4)
ReadFull(buf, r, n, err)
return uint32(binary.BigEndian.Uint32(buf))
}
// Int64
func WriteInt64(i int64, w io.Writer, n *int64, err *error) {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(i))
*n += 8
WriteTo(buf, w, n, err)
}
func ReadInt64(r io.Reader, n *int64, err *error) int64 {
buf := make([]byte, 8)
ReadFull(buf, r, n, err)
return int64(binary.BigEndian.Uint64(buf))
}
// Uint64
func WriteUint64(i uint64, w io.Writer, n *int64, err *error) {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(i))
*n += 8
WriteTo(buf, w, n, err)
}
func ReadUint64(r io.Reader, n *int64, err *error) uint64 {
buf := make([]byte, 8)
ReadFull(buf, r, n, err)
return uint64(binary.BigEndian.Uint64(buf))
}
// Varint
func uvarintSize(i uint64) int {
if i == 0 {
return 0
}
if i < 1<<8 {
return 1
}
if i < 1<<16 {
return 2
}
if i < 1<<24 {
return 3
}
if i < 1<<32 {
return 4
}
if i < 1<<40 {
return 5
}
if i < 1<<48 {
return 6
}
if i < 1<<56 {
return 7
}
return 8
}
func WriteVarint(i int, w io.Writer, n *int64, err *error) {
var negate = false
if i < 0 {
negate = true
i = -i
}
var size = uvarintSize(uint64(i))
if negate {
// e.g. 0xF1 for a single negative byte
WriteUint8(uint8(size+0xF0), w, n, err)
} else {
WriteUint8(uint8(size), w, n, err)
}
if size > 0 {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(i))
WriteTo(buf[(8-size):], w, n, err)
}
*n += int64(1 + size)
}
func ReadVarint(r io.Reader, n *int64, err *error) int {
var size = ReadUint8(r, n, err)
var negate = false
if (size >> 4) == 0xF {
negate = true
size = size & 0x0F
}
if size > 8 {
setFirstErr(err, errors.New("Varint overflow"))
return 0
}
if size == 0 {
if negate {
setFirstErr(err, errors.New("Varint does not allow negative zero"))
}
return 0
}
buf := make([]byte, 8)
ReadFull(buf[(8-size):], r, n, err)
*n += int64(1 + size)
var i = int(binary.BigEndian.Uint64(buf))
if negate {
return -i
} else {
return i
}
}
// Uvarint
func WriteUvarint(i uint, w io.Writer, n *int64, err *error) {
var size = uvarintSize(uint64(i))
WriteUint8(uint8(size), w, n, err)
if size > 0 {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(i))
WriteTo(buf[(8-size):], w, n, err)
}
*n += int64(1 + size)
}
func ReadUvarint(r io.Reader, n *int64, err *error) uint {
var size = ReadUint8(r, n, err)
if size > 8 {
setFirstErr(err, errors.New("Uvarint overflow"))
return 0
}
if size == 0 {
return 0
}
buf := make([]byte, 8)
ReadFull(buf[(8-size):], r, n, err)
*n += int64(1 + size)
return uint(binary.BigEndian.Uint64(buf))
}
func setFirstErr(err *error, newErr error) {
if *err == nil && newErr != nil {
*err = newErr
}
}