Base64.h

/*
 * Base64.h
 *
 *  Created on: Jan 26, 2026
 *      Author: mpeura
 */
 
#ifndef DRAIN_UTIL_BASE64
#define DRAIN_UTIL_BASE64
 
#include <cstdint>
#include <cstring>
 
#include <drain/Enum.h>
//#include <drain/Sprinter.h>
#include "Outlet.h"
 
namespace drain {
 
 
 
class Base64 : public std::vector<uint8_t>  {
 
public:
 
    enum NumType {
        Int8,
        Int16,
        Int32,
        Float16,
        Float32,
        Float64,
    };
 
    NumType getType(){
        return type;
    }
 
 
protected:
    NumType type;
    std::vector<uint8_t> bytes;
 
public:
 
 
    // static
    // void convert(const std::vector<float> & data, std::vector<uint8_t> & bytes);
    template <typename T>
    static
    void convert(const std::vector<T> & data, std::vector<uint8_t> & bytes){
 
        static const size_t N = sizeof(T);
 
        bytes.reserve(data.size() * N); // float
        for (const auto & x: data) {
            append_value_le(bytes, x);
            //append_float32_le(bytes, x);
        }
    }
 
    inline
    void convertFrom(const std::vector<float> & data){
        type = Float32;
        convert(data, *this);
    }
 
    inline
    void convertFrom(const std::vector<uint16_t> & data){
        type = Int16;  // uint!
        convert(data, *this);
    }
 
    /*
    static
    inline void append_float32_le(std::vector<uint8_t>& out, float v) {
        uint32_t u;
        static_assert(sizeof(float) == 4, "float must be 32-bit");
        std::memcpy(&u, &v, 4);
 
        // Write little-endian explicitly:
        out.push_back(uint8_t((u >> 0)  & 0xFF));
        out.push_back(uint8_t((u >> 8)  & 0xFF));
        out.push_back(uint8_t((u >> 16) & 0xFF));
        out.push_back(uint8_t((u >> 24) & 0xFF));
    }
    */
 
    template <typename T>
    static
    inline void append_value_le(std::vector<uint8_t>& out, T v) {
 
        static
        const size_t N = sizeof(T);
 
        uint32_t u;
        std::memcpy(&u, &v, N);
 
        for (size_t i=0; i<N; ++i){
            // Write little-endian explicitly:
            out.push_back(uint8_t(u & 0xFF));
            u = (u>>8);
        }
        // Write little-endian explicitly:
        /*
        out.push_back(uint8_t((u >> 0)  & 0xFF));
        out.push_back(uint8_t((u >> 8)  & 0xFF));
        out.push_back(uint8_t((u >> 16) & 0xFF));
        out.push_back(uint8_t((u >> 24) & 0xFF));
        */
    }
 
 
    static
    void base64_encode(const std::vector<uint8_t>& data, std::string & out);
 
    /*
    template <typename T>
    static
    void createArray(const Outlet & code, const std::string & variableName, NumType type, const T & sequence);
    */
 
protected:
 
    static
    void assign();
 
};
 
DRAIN_ENUM_DICT(Base64::NumType);
DRAIN_ENUM_OSTREAM(Base64::NumType);
 
/*
template <typename T>  // std::string & code  // std::ostream & ostr
void Base64::createArray(const Outlet & code, const std::string & variableName, NumType type, const T & sequence){
    code << "const " << variableName << " = new " << type << "Array(";
    Sprinter::toStream(code.getOStream(), sequence, Sprinter::jsLayout);
    code << ");";
}
*/
 
 
} // drain::
 
#endif // SRC_DRAIN_UTIL_Base64_H_