Function hexToDecimal

conversion/hexadecimaltodecimal.go:23–57

hexToDecimal converts a hexadecimal string to a decimal integer.

(hexStr string)

// hexToDecimal converts a hexadecimal string to a decimal integer.
func hexToDecimal(hexStr string) (int64, error) {

	hexStr = strings.TrimSpace(hexStr)

	if len(hexStr) == 0 {
		return 0, fmt.Errorf("input string is empty")
	}

	// Check if the string has a valid hexadecimal prefix
	if len(hexStr) > 2 && (hexStr[:2] == "0x" || hexStr[:2] == "0X") {
		hexStr = hexStr[2:]
	}

	// Validate the hexadecimal string
	if !isValidHexadecimal(hexStr) {
		return 0, fmt.Errorf("invalid hexadecimal string")
	}

	var decimalValue int64
	for _, char := range hexStr {
		var digit int64
		if char >= '0' && char <= '9' {
			digit = int64(char - '0')
		} else if char >= 'A' && char <= 'F' {
			digit = int64(char - 'A' + 10)
		} else if char >= 'a' && char <= 'f' {
			digit = int64(char - 'a' + 10)
		} else {
			return 0, fmt.Errorf("invalid character in hexadecimal string: %c", char)
		}
		decimalValue = decimalValue*16 + digit
	}

	return decimalValue, nil
}