squeezelite-esp32/components/spotify/cspot/src/Utils.cpp

#include "Utils.h"
#include <cstring>
#include <memory>
#include <chrono>
#include <string>
#include <sstream>
#include <iostream>
#include <iomanip>

unsigned long long getCurrentTimestamp()
{
	return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
}

uint64_t hton64(uint64_t value) {
    int num = 42;
    if (*(char *)&num == 42) {
        uint32_t high_part = htonl((uint32_t)(value >> 32));
        uint32_t low_part = htonl((uint32_t)(value & 0xFFFFFFFFLL));
        return (((uint64_t)low_part) << 32) | high_part;
    } else {
        return value;
    }
}

std::vector<uint8_t> stringHexToBytes(const std::string & s) {
    std::vector<uint8_t> v;
    v.reserve(s.length() / 2);

    for (std::string::size_type i = 0; i < s.length(); i += 2) {
        std::string byteString = s.substr(i, 2);
        uint8_t byte = (uint8_t) strtol(byteString.c_str(), NULL, 16);
        v.push_back(byte);
    }

    return v;
}

std::string bytesToHexString(const std::vector<uint8_t>& v) {
    std::stringstream ss;
    ss << std::hex << std::setfill('0');
    std::vector<uint8_t>::const_iterator it;

    for (it = v.begin(); it != v.end(); it++) {
        ss << std::setw(2) << static_cast<unsigned>(*it);
    }

    return ss.str();
}

std::vector<uint8_t> bigNumAdd(std::vector<uint8_t> num, int n)
{
    auto carry = n;
    for (int x = num.size() - 1; x >= 0; x--)
    {
        int res = num[x] + carry;
        if (res < 256)
        {
            carry = 0;
            num[x] = res;
        }
        else
        {
            // Carry the rest of the division
            carry = res / 256;
            num[x] = res % 256;

            // extend the vector at the last index
            if (x == 0)
            {
                num.insert(num.begin(), carry);
                return num;
            }
        }
    }

    return num;
}

std::vector<uint8_t> bigNumDivide(std::vector<uint8_t> num, int n)
{
    auto carry = 0;
    for (int x = 0; x < num.size(); x++)
    {
        int res = num[x] + carry * 256;
        if (res < n)
        {
            carry = res;
            num[x] = 0;
        }
        else
        {
            // Carry the rest of the division
            carry = res % n;
            num[x] = res / n;
        }
    }

    return num;
}

std::vector<uint8_t> bigNumMultiply(std::vector<uint8_t> num, int n)
{
    auto carry = 0;
    for (int x = num.size() - 1; x >= 0; x--)
    {
        int res = num[x] * n + carry;
        if (res < 256)
        {
            carry = 0;
            num[x] = res;
        }
        else
        {
            // Carry the rest of the division
            carry = res / 256;
            num[x] = res % 256;

            // extend the vector at the last index
            if (x == 0)
            {
                num.insert(num.begin(), carry);
                return num;
            }
        }
    }

    return num;
}
unsigned char h2int(char c)
{
    if (c >= '0' && c <='9'){
        return((unsigned char)c - '0');
    }
    if (c >= 'a' && c <='f'){
        return((unsigned char)c - 'a' + 10);
    }
    if (c >= 'A' && c <='F'){
        return((unsigned char)c - 'A' + 10);
    }
    return(0);
}

std::string urlDecode(std::string str)
{
    std::string encodedString="";
    char c;
    char code0;
    char code1;
    for (int i =0; i < str.length(); i++){
        c=str[i];
      if (c == '+'){
        encodedString+=' ';  
      }else if (c == '%') {
        i++;
        code0=str[i];
        i++;
        code1=str[i];
        c = (h2int(code0) << 4) | h2int(code1);
        encodedString+=c;
      } else{
        
        encodedString+=c;  
      }
    }
    
   return encodedString;
}