func valueUnPack(fPrev float32, packed uint64) (length uint, value float32) {
if one, _ := bitopts.TestBit64(packed, 63); !one {
return 1, fPrev
}
leadzeroLen, _ := bitopts.GetField64(packed, 62, 58)
sigbitLen, _ := bitopts.GetField64(packed, 57, 52)
xorval, _ := bitopts.GetField64(packed, 51, uint(51-(sigbitLen-1)))
trailzeroLen := 32 - (leadzeroLen + sigbitLen)
xor32 := uint32(xorval << trailzeroLen)
bval := (*(*uint32)(unsafe.Pointer(&fPrev))) ^ (*(*uint32)(unsafe.Pointer(&xor32)))
value = (*(*float32)(unsafe.Pointer(&bval)))
return uint(sigbitLen + 12), value
}
func timeUnPack(deltaSample, tPrev int64, packed uint64) (length uint, tVal int64) {
if one, _ := bitopts.TestBit64(packed, 63); !one {
return 1, tPrev + deltaSample
}
neg := false
if one, _ := bitopts.TestBit64(packed, 62); one {
neg = true
}
delta, _ := bitopts.GetField64(packed, 61, 57)
deltaS := int64(delta)
if neg {
deltaS = -deltaS
}
return 7, tPrev + deltaSample + deltaS
}