to_bytes_converters.go

package faststrconv

const (
	uint10    = 10
	uint100   = 100
	uint1000  = 1000
	uint10000 = 10000
)

// Uint642Bytes converts an uint64 number to string.
func Uint642Bytes(num uint64) []byte {
	convertedNumber := make([]byte, 20)
	i := 19
	for {
		convertedNumber[i] = byte(num%10) | 0x30
		num = num / 10
		if num == 0 {
			return convertedNumber[i:]
		}
		i--
	}
}

// Uint322Bytes converts an uint32 number to string.
func Uint322Bytes(num uint32) []byte {
	convertedNumber := make([]byte, 10)
	i := 9
	for {
		convertedNumber[i] = byte(num%10) | 0x30
		num = num / 10
		if num == 0 {
			return convertedNumber[i:]
		}
		i--
	}
}

type unsigned interface {
	~uint | ~uint32 | ~uint64
}

// Uint2Bytes converts an uint, uint32 and uint64 number to string.
func Uint2Bytes[UI unsigned](num UI) []byte {
	var convertedNumber []byte
	var i byte
	if num > maxUint32 {
		convertedNumber = make([]byte, 20)
		i = 19
	} else {
		convertedNumber = make([]byte, 10)
		i = 9
	}
	for {
		convertedNumber[i] = byte(num%10) | 0x30
		num = num / 10
		if num == 0 {
			return convertedNumber[i:]
		}
		i--
	}
}

// Uint162Bytes converts an uint16 number to string.
func Uint162Bytes(num uint16) []byte {
	convertedNumber, i := getSliceUint16(num)
	for {
		convertedNumber[i] = byte(num%10) | 0x30
		num = num / 10
		if i == 0 {
			return convertedNumber
		}
		i--
	}
}

func getSliceUint16(num uint16) ([]byte, int) {
	if num < uint10 {
		return make([]byte, 1), 0
	}

	if num < uint100 {
		return make([]byte, 2), 1
	}

	if num < uint1000 {
		return make([]byte, 3), 2
	}

	if num < uint10000 {
		return make([]byte, 4), 3
	}

	return make([]byte, 5), 4
}

// Byte2Bytes converts a byte number to []byte.
func Byte2Bytes(num byte) []byte {
	convertedNumber, i := getSliceByte(num)
	for {
		convertedNumber[i] = num%10 | 0x30
		num = num / 10
		if i == 0 {
			return convertedNumber
		}
		i--
	}
}

func getSliceByte(num byte) ([]byte, int) {
	if num < uint10 {
		return make([]byte, 1), 0
	}

	if num < uint100 {
		return make([]byte, 2), 1
	}

	return make([]byte, 3), 2
}