morse_code.cpp File Reference

Implementation of Morse Code. More...

#include <cassert>
#include <iostream>
#include <string>
#include <vector>

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Namespaces
	ciphers
	Algorithms for encryption and decryption.
	morse
	Functions for Morse Code.

Functions
std::string	ciphers::morse::char_to_morse (const char &c)
char	ciphers::morse::morse_to_char (const std::string &s)
std::string	ciphers::morse::encrypt (const std::string &text)
std::string	ciphers::morse::decrypt (const std::string &text)
static void	test ()
	Function to test above algorithm. More...
int	main ()
	Main function. More...

Detailed Description

Implementation of Morse Code.

Author

Deep Raval

Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes or dits and dahs. Morse code is named after Samuel Morse, an inventor of the telegraph.

Function Documentation

char_to_morse()

std::string ciphers::morse::char_to_morse

(

const char &

c

)

Get the morse representation for given character.

Parameters

c

Character

Returns

morse representation string of character

                                       {
    // return corresponding morse code
    switch (c) {
        case 'a':
            return ".-";
        case 'b':
            return "-...";
        case 'c':
            return "-.-.";
        case 'd':
            return "-..";
        case 'e':
            return ".";
        case 'f':
            return "..-.";
        case 'g':
            return "--.";
        case 'h':
            return "....";
        case 'i':
            return "..";
        case 'j':
            return ".---";
        case 'k':
            return "-.-";
        case 'l':
            return ".-..";
        case 'm':
            return "--";
        case 'n':
            return "-.";
        case 'o':
            return "---";
        case 'p':
            return ".--.";
        case 'q':
            return "--.-";
        case 'r':
            return ".-.";
        case 's':
            return "...";
        case 't':
            return "-";
        case 'u':
            return "..-";
        case 'v':
            return "...-";
        case 'w':
            return ".--";
        case 'x':
            return "-..-";
        case 'y':
            return "-.--";
        case 'z':
            return "--..";
        case '1':
            return ".----";
        case '2':
            return "..---";
        case '3':
            return "...--";
        case '4':
            return "....-";
        case '5':
            return ".....";
        case '6':
            return "-....";
        case '7':
            return "--...";
        case '8':
            return "---..";
        case '9':
            return "----.";
        case '0':
            return "-----";
        default:
            std::cerr << "Found invalid character: " << c << ' ' << std::endl;
            std::exit(0);
    }
}

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decrypt()

std::string ciphers::morse::decrypt

(

const std::string &

text

)

Decrypt given morse coded text.

Parameters

text	text to be decrypted

Returns

new decrypted text

                                         {
    // Going through each character of text and converting it
    // back to normal representation.
    std::string decrypted_text = "";  // Empty string to store decrypted text
    // Spliting string (with delimiter = " ") and storing it
    // in vector
    std::size_t pos_start = 0, pos_end = 0, delim_len = 1;
    std::vector<std::string> splits;
    while ((pos_end = text.find(' ', pos_start)) != std::string::npos) {
        std::string token = text.substr(pos_start, pos_end - pos_start);
        pos_start = pos_end + delim_len;
        splits.push_back(token);
    }
 
    // Traversing through each morse code string
    for (const std::string &s : splits) {
        // Add corresponding character
        decrypted_text += ciphers::morse::morse_to_char(s);
    }
 
    return decrypted_text;  // Returning decrypted text
}

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encrypt()

std::string ciphers::morse::encrypt

(

const std::string &

text

)

Encrypt given text using morse code.

Parameters

text	text to be encrypted

Returns

new encrypted text

                                         {
    std::string encrypted_text = "";  // Empty string to store encrypted text
    // Going through each character of text and converting it
    // to morse representation
    for (const char &c : text) {
        encrypted_text += ciphers::morse::char_to_morse(c) + " ";
    }
    return encrypted_text;  // Returning encrypted text
}

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main()

int main

(

void

)

Main function.

Returns

0 on exit

           {
    // Testing
    test();
    return 0;
}

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morse_to_char()

char ciphers::morse::morse_to_char

(

const std::string &

s

)

Get character from the morse representation.

Parameters

s	Morse representation

Returns

corresponding character

                                       {
    // return corresponding character
    if (s == ".-") {
        return 'a';
    } else if (s == "-...") {
        return 'b';
    } else if (s == "-.-.") {
        return 'c';
    } else if (s == "-..") {
        return 'd';
    } else if (s == ".") {
        return 'e';
    } else if (s == "..-.") {
        return 'f';
    } else if (s == "--.") {
        return 'g';
    } else if (s == "....") {
        return 'h';
    } else if (s == "..") {
        return 'i';
    } else if (s == ".---") {
        return 'j';
    } else if (s == "-.-") {
        return 'k';
    } else if (s == ".-..") {
        return 'l';
    } else if (s == "--") {
        return 'm';
    } else if (s == "-.") {
        return 'n';
    } else if (s == "---") {
        return 'o';
    } else if (s == ".--.") {
        return 'p';
    } else if (s == "--.-") {
        return 'q';
    } else if (s == ".-.") {
        return 'r';
    } else if (s == "...") {
        return 's';
    } else if (s == "-") {
        return 't';
    } else if (s == "..-") {
        return 'u';
    } else if (s == "...-") {
        return 'v';
    } else if (s == ".--") {
        return 'w';
    } else if (s == "-..-") {
        return 'x';
    } else if (s == "-.--") {
        return 'y';
    } else if (s == "--..") {
        return 'z';
    } else if (s == ".----") {
        return '1';
    } else if (s == "..---") {
        return '2';
    } else if (s == "...--") {
        return '3';
    } else if (s == "....-") {
        return '4';
    } else if (s == ".....") {
        return '5';
    } else if (s == "-....") {
        return '6';
    } else if (s == "--...") {
        return '7';
    } else if (s == "---..") {
        return '8';
    } else if (s == "----.") {
        return '9';
    } else if (s == "-----") {
        return '0';
    } else {
        std::cerr << "Found invalid Morse code: " << s << ' ' << std::endl;
        std::exit(0);
    }
}

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test()

static void test ( )

static

Function to test above algorithm.

Returns

void

                   {
    // Test 1
    std::string text1 = "01234567890";
    std::string encrypted1 = ciphers::morse::encrypt(text1);
    std::string decrypted1 = ciphers::morse::decrypt(encrypted1);
    assert(text1 == decrypted1);
    std::cout << "Original text : " << text1 << std::endl;
    std::cout << "Encrypted text : " << encrypted1 << std::endl;
    std::cout << "Decrypted text : " << decrypted1 << std::endl;
    // Test 2
    std::string text2 = "abcdefghijklmnopqrstuvwxyz";
    std::string encrypted2 = ciphers::morse::encrypt(text2);
    std::string decrypted2 = ciphers::morse::decrypt(encrypted2);
    assert(text2 == decrypted2);
    std::cout << "Original text : " << text2 << std::endl;
    std::cout << "Encrypted text : " << encrypted2 << std::endl;
    std::cout << "Decrypted text : " << decrypted2 << std::endl;
}

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