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package utils
import (
"encoding/binary"
"log"
"math"
"math/bits"
"os"
"unsafe"
)
func ReverseByteArrayValues(byteArr []byte, size int) []byte {
arr := make([]byte, size)
for index, byteValue := range byteArr {
arr[index] = bits.Reverse8(byteValue)
}
return arr
}
func ReadByteFromFile(file *os.File, size int32) []byte {
tmp := make([]byte, size)
file.Read(tmp)
return tmp
}
func CheckError(e error) {
if e != nil {
log.Panic(e)
}
}
func IntFromBytes(byteArr []byte) uint32 {
int := binary.LittleEndian.Uint32(byteArr)
return int
}
func FloatFromBytes(byteArr []byte) float32 {
bits := binary.LittleEndian.Uint32(byteArr)
float := math.Float32frombits(bits)
return float
}
func FloatArrFromBytes(byteArr []byte) []float32 {
if len(byteArr) == 0 {
return nil
}
l := len(byteArr) / 4
ptr := unsafe.Pointer(&byteArr[0])
// It is important to keep in mind that the Go garbage collector
// will not interact with this data, and that if src if freed,
// the behavior of any Go code using the slice is nondeterministic.
// Reference: https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices
return (*[1 << 26]float32)((*[1 << 26]float32)(ptr))[:l:l]
}
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