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87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
#include <iostream>
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#include <string>
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#include <cstring>
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#include <vector>
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#include <cstdint>
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#include <iomanip>
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namespace code {
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namespace { /* Since these are internal function, I have wrapped them in an anonymous namespace, to prevent outside access to them */
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/* Tokenizes a string, based on the given delimiter */
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std::vector<std::string> tokenize_str(std::string str, std::string delim) {
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std::vector<std::string> result;
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char* c_str = str.data();
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char* c_delim = delim.data();
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char* tok = strtok(c_str, c_delim);
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while (tok != NULL) {
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result.push_back(std::string(tok));
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tok = strtok(NULL, c_delim);
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}
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return result;
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}
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/* Convert an IPv4 address from decimal to dotted decimal notation */
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std::string dec_to_dotted_dec(std::string addr) {
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uint32_t addr_val = std::stoul(addr); /* 32 bit address */
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uint8_t addr_1 = (addr_val & (0xFF << 24)) >> 24; /* First octet (Bitwise AND the address with 255.0.0.0, and shift it to the right to obtain the first octet) */
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uint8_t addr_2 = (addr_val & (0xFF << 16)) >> 16;
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uint8_t addr_3 = (addr_val & (0xFF << 8)) >> 8;
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uint8_t addr_4 = (addr_val & 0xFF);
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std::string ret_val = std::string(std::to_string(addr_1) + "." + std::to_string(addr_2) + "." + std::to_string(addr_3) + "." + std::to_string(addr_4));
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return ret_val;
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}
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/* Convert an IPv4 address from dotted deecimal to decimal */
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std::string dotted_dec_to_dec(std::string addr) {
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std::vector<std::string> octets = tokenize_str(addr, ".");
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uint32_t addr_val = (std::stoul(octets[0]) << 24) + (std::stoul(octets[1]) << 16) + (std::stoul(octets[2]) << 8) + (std::stoul(octets[3]));
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return std::to_string(addr_val);
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}
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}
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/* Given an address and a port, return a 'code' which has the address and port encoded in it */
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std::string encode(std::string address, std::string port) {
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/* Convert the address to decimal, and convert that to hex */
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std::string addr_coded = dotted_dec_to_dec(address);
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std::stringstream stream;
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stream << std::hex << std::stoul(addr_coded, 0, 10);
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addr_coded = stream.str();
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stream.str("");
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/* Convert the port to hex */
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stream << std::hex << std::stoul(port, 0, 10);
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std::string port_coded = stream.str();
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std::string ret_val = addr_coded + "_" + port_coded;
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return ret_val;
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}
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/* Given a code, decode it and return a vector with the address and port */
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std::vector<std::string> decode(std::string connect_code) {
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std::vector<std::string> result = tokenize_str(connect_code, "_"); /* Split the string into address and port */
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std::string address = result[0]; /* Address (in base 16) */
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std::string port = result[1]; /* Port (in base 16) */
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/* Base 16 to base 10 - These lines convert the string to a base 10 number, and convert the result back into a string */
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address = std::to_string(std::stoul(address, 0, 16));
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port = std::to_string(std::stoul(address, 0, 10));
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/* Convert decimal address to dotted decimal */
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address = dec_to_dotted_dec(address);
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std::vector<std::string> ret_val;
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ret_val.push_back(address);
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ret_val.push_back(port);
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return ret_val;
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}
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}
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