1. /**
  2. * Simple message queue decoder.
  3. * Handles basic encoding/decoding for demonstration purposes.
  4. */
  5. class MessageDecoder {
  7. /**
  8. * Decodes a message.
  9. * @param {string} encodedMessage The encoded message.
  10. * @param {string} encodingType The type of encoding used (e.g., "base64", "hex").
  11. * @returns {string} The decoded message, or null if decoding fails.
  12. */
  13. decode(encodedMessage, encodingType) {
  14. try {
  15. switch (encodingType.toLowerCase()) {
  16. case "base64":
  17. return atob(encodedMessage); // Basic Base64 decoding
  18. case "hex":
  19. return decodeHex(encodedMessage); //decode hex string
  20. default:
  21. console.warn("Unsupported encoding type:", encodingType);
  22. return null;
  23. }
  24. } catch (error) {
  25. console.error("Decoding error:", error);
  26. return null;
  27. }
  28. }
  31. /**
  32. * Helper function to decode a hexadecimal string.
  33. * @param {string} hexString The hexadecimal string to decode.
  34. * @returns {string} The decoded string.
  35. */
  36. decodeHex(hexString) {
  37. const hexValues = hexString.match(/([0-9a-fA-F]{2})/g);
  38. if (!hexValues) return "";
  39. return Array.from(hexValues).map(hex => String.fromCharCode(parseInt(hex, 16))).join("");
  40. }
  41. }
  43. // Example Usage (for testing)
  44. // const decoder = new MessageDecoder();
  45. // const encoded = "SGVsbG8gV29ybGQh"; // Base64 encoded "Hello World!"
  46. // const decoded = decoder.decode(encoded, "base64");
  47. // console.log("Decoded:", decoded); // Output: Decoded: Hello World!
  49. // const hexEncoded = "48656c6c6f20576f726c64"; // Hex encoded "Hello World!"
  50. // const decodedHex = decoder.decode(hexEncoded, "hex");
  51. // console.log("Decoded Hex:", decodedHex); // Output: Decoded Hex: Hello World!

Add your comment