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