ksuid/uint128.go at master · segmentio/ksuid · GitHub

Name: ksuid/uint128.go at master · segmentio/ksuid · GitHub
Rating: 4.8 (8419 reviews)
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package ksuid

import (
"encoding/binary"
"fmt"
"math/bits"
)

// uint128 represents an unsigned 128 bits little endian integer.
typeuint128 [2]uint64

funcuint128Payload(ksuidKSUID) uint128 {
returnmakeUint128FromPayload(ksuid[timestampLengthInBytes:])
}

funcmakeUint128(highuint64, lowuint64) uint128 {
returnuint128{low, high}
}

funcmakeUint128FromPayload(payload []byte) uint128 {
returnuint128{
binary.BigEndian.Uint64(payload[8:]), // low
binary.BigEndian.Uint64(payload[:8]), // high
 }
}

func (vuint128) ksuid(timestampuint32) (outKSUID) {
binary.BigEndian.PutUint32(out[:4], timestamp) // time
binary.BigEndian.PutUint64(out[4:12], v[1]) // high
binary.BigEndian.PutUint64(out[12:], v[0]) // low
return
}

func (vuint128) bytes() (out [16]byte) {
binary.BigEndian.PutUint64(out[:8], v[1])
binary.BigEndian.PutUint64(out[8:], v[0])
return
}

func (vuint128) String() string {
returnfmt.Sprintf("0x%016X%016X", v[0], v[1])
}

funccmp128(x, yuint128) int {
ifx[1] <y[1] {
return-1
 }
ifx[1] >y[1] {
return1
 }
ifx[0] <y[0] {
return-1
 }
ifx[0] >y[0] {
return1
 }
return0
}

funcadd128(x, yuint128) (zuint128) {
varcuint64
z[0], c=bits.Add64(x[0], y[0], 0)
z[1], _=bits.Add64(x[1], y[1], c)
return
}

funcsub128(x, yuint128) (zuint128) {
varbuint64
z[0], b=bits.Sub64(x[0], y[0], 0)
z[1], _=bits.Sub64(x[1], y[1], b)
return
}

funcincr128(xuint128) (zuint128) {
varcuint64
z[0], c=bits.Add64(x[0], 1, 0)
z[1] =x[1] +c
return
}