+++ /dev/null
-package multiaddr
-
-import (
- "encoding/binary"
- "fmt"
- "math/bits"
-)
-
-// VarintSize returns the size (in bytes) of `num` encoded as a varint.
-func VarintSize(num int) int {
- bits := bits.Len(uint(num))
- q, r := bits/7, bits%7
- size := q
- if r > 0 || size == 0 {
- size++
- }
- return size
-}
-
-// CodeToVarint converts an integer to a varint-encoded []byte
-func CodeToVarint(num int) []byte {
- buf := make([]byte, VarintSize(num))
- n := binary.PutUvarint(buf, uint64(num))
- return buf[:n]
-}
-
-// VarintToCode converts a varint-encoded []byte to an integer protocol code
-func VarintToCode(buf []byte) int {
- num, _, err := ReadVarintCode(buf)
- if err != nil {
- panic(err)
- }
- return num
-}
-
-// ReadVarintCode reads a varint code from the beginning of buf.
-// returns the code, and the number of bytes read.
-func ReadVarintCode(buf []byte) (int, int, error) {
- num, n := binary.Uvarint(buf)
- if n < 0 {
- return 0, 0, fmt.Errorf("varints larger than uint64 not yet supported")
- }
- return int(num), n, nil
-}