pcap.h

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#pragma once
 
#include <cstdint>
#include <cstdio>
#include <expected>
#include <filesystem>
#include <span>
#include <string>
#include <vector>
 
 
namespace mm::capture {
 
struct Record {
  int64_t timestampNs = 0;     
  std::vector<uint8_t> bytes;  
};
 
class PcapWriter {
 public:
  PcapWriter() = default;
  ~PcapWriter();
  PcapWriter(const PcapWriter&) = delete;
  PcapWriter& operator=(const PcapWriter&) = delete;
 
  std::expected<void, std::string> open(const std::filesystem::path& path);
 
  std::expected<void, std::string> write(int64_t timestampNs, std::span<const uint8_t> bytes);
 
  void close();
 
 private:
  std::FILE* file_ = nullptr;
};
 
std::expected<std::vector<Record>, std::string> parsePcap(std::span<const uint8_t> bytes);
 
std::expected<std::vector<Record>, std::string> readPcap(const std::filesystem::path& path);
 
}  // namespace mm::capture