btfak / sntp Goto Github PK

如题！

NTP client only gets the time of the server, and does not process the time through NTP protocol

// generate
/*
Field Name Request Reply
----------------------------------------------------------
LI 0 or 3 0
VN 1-4 copied from request
Mode 3 4
Stratum ignore 1
Poll ignore copied from request
Precision ignore -log2 server significant bits
Root Delay ignore 0
Root Dispersion ignore 0
Reference Identifier ignore source ident
Reference Timestamp ignore time of last radio update
Originate Timestamp ignore copied from transmit timestamp
Receive Timestamp ignore time of day
Transmit Timestamp (see text) time of day
*/
func generate(req []byte) []byte {
var second = unix2ntp(time.Now().Unix())
var fraction = unix2ntp(int64(time.Now().Nanosecond()))
var res = make([]byte, 48)
var vn = req[0] & 0x38
res[0] = vn + 4
res[1] = 1
res[2] = req[2]
res[3] = 0xEC
res[12] = 0x4E
res[13] = 0x49
res[14] = 0x43
res[15] = 0x54
copy(res[16:20], int2bytes(second)[0:])
copy(res[24:32], req[40:48])
copy(res[32:36], int2bytes(second)[0:])
copy(res[36:40], int2bytes(fraction)[0:])
copy(res[40:48], res[32:40])
return res
}

44-48这几个字节数放的是纳秒数，为什么通过函数unix2ntp增加一个时间呢，40-44保存了秒数，44-48保存纳秒不就可以了么？
func int2bytes(i int64) []byte 这个函数把int64 8个字节的数据放在4个字节的byte数组里面放得下么？
还有就是这个库现在稳定么？