binary-protocol-cpp/protocol.h at main · beingamanforever/binary-protocol-cpp · GitHub

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#pragma once
#include <cstdint>
#include <cstddef>

namespace protocol
{

    // Message type identifiers
    constexpr uint16_t MSG_ORDER = 0x0001;
    constexpr uint16_t MSG_CANCEL = 0x0002;
    constexpr uint16_t MSG_ACK = 0x0003;

    // Header layout: [msg_type: 2][msg_len: 2][checksum: 2] = 6 bytes
    constexpr size_t HEADER_SIZE = 6;

    // Order payload: [order_id: 8][price: 4][quantity: 4][side: 1][padding: 1] = 18 bytes
    constexpr size_t ORDER_PAYLOAD_SIZE = 18;
    constexpr size_t ORDER_MSG_SIZE = HEADER_SIZE + ORDER_PAYLOAD_SIZE; // 24 bytes total

    // Field offsets within message buffer
    namespace offset
    {
        constexpr size_t MSG_TYPE = 0;
        constexpr size_t MSG_LEN = 2;
        constexpr size_t CHECKSUM = 4;
        constexpr size_t PAYLOAD = 6;

        // Order payload offsets (relative to PAYLOAD)
        constexpr size_t ORDER_ID = 0;
        constexpr size_t PRICE = 8;
        constexpr size_t QUANTITY = 12;
        constexpr size_t SIDE = 16;
    }

    // Order sides
    constexpr uint8_t SIDE_BUY = 0x01;
    constexpr uint8_t SIDE_SELL = 0x02;

} // namespace protocol