BLEMIDIPacketBuilder.hpp

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#pragma once
 
#include <MIDI_Parsers/MIDI_MessageTypes.hpp>
 
#include <AH/STL/vector>
 
BEGIN_CS_NAMESPACE
 
class BLEMIDIPacketBuilder {
  private:
    uint8_t runningHeader = 0;
    uint8_t runningTimestamp = 0;
    std::vector<uint8_t> buffer = std::vector<uint8_t>(0);
 
    constexpr static const uint8_t SysExStart =
        static_cast<uint8_t>(MIDIMessageType::SYSEX_START);
    constexpr static const uint8_t SysExEnd =
        static_cast<uint8_t>(MIDIMessageType::SYSEX_END);
 
    bool hasSpaceFor(size_t bytes) const {
        return bytes <= size_t(buffer.capacity() - buffer.size());
    }
 
    constexpr static uint8_t getTimestampMSB(uint16_t timestamp) {
        return ((timestamp >> 7) & 0x3F) | 0x80;
    }
    constexpr static uint8_t getTimestampLSB(uint16_t timestamp) {
        return timestamp | 0x80;
    }
 
    void initBuffer(uint16_t timestamp) {
        if (buffer.empty())
            buffer.push_back(getTimestampMSB(timestamp));
    }
 
    template <bool ThreeBytes>
    bool addImpl(uint8_t header, uint8_t data1, uint8_t data2,
                 uint16_t timestamp);
 
  public:
    BLEMIDIPacketBuilder(size_t capacity = 20) { buffer.reserve(capacity); }
 
    void reset();
 
    void setCapacity(uint16_t capacity);
 
    uint16_t getSize() const { return buffer.size(); }
    const uint8_t *getBuffer() const { return buffer.data(); }
    bool empty() const { return buffer.empty(); }
 
    const std::vector<uint8_t> &getPacket() const { return buffer; }
 
    bool add3B(uint8_t header, uint8_t data1, uint8_t data2,
               uint16_t timestamp);
 
    bool add2B(uint8_t header, uint8_t data1, uint16_t timestamp);
 
    bool addRealTime(uint8_t rt, uint16_t timestamp);
 
    bool addSysCommon(uint8_t num_data, uint8_t header, uint8_t data1,
                      uint8_t data2, uint16_t timestamp);
 
    bool addSysEx(const uint8_t *&data, size_t &length, uint16_t timestamp);
 
    void continueSysEx(const uint8_t *&data, size_t &length,
                       uint16_t timestamp);
};
 
END_CS_NAMESPACE