package utils

import (
	"encoding/binary"
	"unsafe"
)

func Int2binary(num int, b int) []byte {
	var a int64 //Go的破毛病
	buf := make([]byte, unsafe.Sizeof(a))
	if len(buf) > b {
		panic("int2binary: buff must be greater than size of int64")
	}
	binary.PutVarint(buf, int64(num))
	ret := make([]byte, b)
	for i := 0; i < len(ret); i++ {
		ret[i] = 0
	}
	copy(ret, buf)
	return ret
}

func Binary2Int(bin []byte) int {
	var a int64           //Go的破毛病
	b := unsafe.Sizeof(a) //只取前面几位
	num, n := binary.Varint(bin[:b])
	if n == 0 {
		panic("Binary2Int:buf too small")
	}
	if n < 0 {
		panic("value larger than 64 bits (overflow) sand -n is the number of bytes read")
	}
	return int(num)
}