ESP32Marauder/esp32_marauder/utils.h

#pragma once
#ifndef utils_h
#define utils_h

#include <Arduino.h>
#include <vector>

struct mac_addr {
   unsigned char bytes[6];
};

struct Station {
  uint8_t mac[6];
  bool selected;
};

String byteArrayToHexString(const std::vector<uint8_t>& byteArray) {
  String result;

  for (size_t i = 0; i < byteArray.size(); i++) {
    // Append the byte in "0xXX" format
    result += "0x";
    if (byteArray[i] < 0x10) {
      result += "0"; // Add leading zero for single-digit hex values
    }
    result += String(byteArray[i], HEX);

    // Add a space between bytes, but not at the end
    if (i < byteArray.size() - 1) {
      result += " ";
    }
  }

  return result;
}

std::vector<uint8_t> hexStringToByteArray(const String& hexString) {
  std::vector<uint8_t> byteArray;

  // Split the input string by spaces
  int startIndex = 0;
  while (startIndex < hexString.length()) {
    // Find the next space or end of string
    int spaceIndex = hexString.indexOf(' ', startIndex);

    // If no space is found, process the last token
    if (spaceIndex == -1) {
      spaceIndex = hexString.length();
    }

    // Extract the "0xXX" part
    String byteString = hexString.substring(startIndex, spaceIndex);

    // Convert "0xXX" to an integer and store it in the vector
    if (byteString.startsWith("0x") || byteString.startsWith("0X")) {
      uint8_t byte = strtol(byteString.c_str() + 2, nullptr, 16);
      byteArray.push_back(byte);
    }

    // Move the start index to the next byte
    startIndex = spaceIndex + 1;
  }

  return byteArray;
}

void generateRandomName(char *name, size_t length) {
    static const char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
    
    // Generate the first character as uppercase
    name[0] = 'A' + (rand() % 26);
    
    // Generate the remaining characters as lowercase
    for (size_t i = 1; i < length - 1; ++i) {
        name[i] = alphabet[rand() % (sizeof(alphabet) - 1)];
    }
    name[length - 1] = '\0';  // Null-terminate the string
}

const char* generateRandomName() {
  const char* charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  int len = rand() % 10 + 1; // Generate a random length between 1 and 10
  char* randomName = (char*)malloc((len + 1) * sizeof(char)); // Allocate memory for the random name
  for (int i = 0; i < len; ++i) {
    randomName[i] = charset[rand() % strlen(charset)]; // Select random characters from the charset
  }
  randomName[len] = '\0'; // Null-terminate the string
  return randomName;
}

void generateRandomMac(uint8_t* mac) {
  // Set the locally administered bit and unicast bit for the first byte
  mac[0] = 0x02; // The locally administered bit is the second least significant bit

  // Generate the rest of the MAC address
  for (int i = 1; i < 6; i++) {
    mac[i] = random(0, 255);
  }
}

String macToString(const Station& station) {
  char macStr[18]; // 6 pairs of hex digits + 5 colons + null terminator
  snprintf(macStr, sizeof(macStr), "%02X:%02X:%02X:%02X:%02X:%02X",
           station.mac[0], station.mac[1], station.mac[2],
           station.mac[3], station.mac[4], station.mac[5]);
  return String(macStr);
}

String macToString(uint8_t macAddr[6]) {
  char macStr[18]; // 17 characters for "XX:XX:XX:XX:XX:XX" + 1 null terminator
  snprintf(macStr, sizeof(macStr), "%02X:%02X:%02X:%02X:%02X:%02X", 
    macAddr[0], macAddr[1], macAddr[2], 
    macAddr[3], macAddr[4], macAddr[5]);
  return String(macStr);
}

void convertMacStringToUint8(const String& macStr, uint8_t macAddr[6]) {
    // Ensure the input string is in the format "XX:XX:XX:XX:XX:XX"
    if (macStr.length() != 17) {
        Serial.println("Invalid MAC address format");
        return;
    }

    // Parse the MAC address string and fill the uint8_t array
    for (int i = 0; i < 6; i++) {
        macAddr[i] = (uint8_t)strtol(macStr.substring(i * 3, i * 3 + 2).c_str(), nullptr, 16);
    }
}

#endif