pack.hpp

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#pragma once
 
#include <cstdint>
#include <filesystem>
#include <optional>
#include <string>
#include <unordered_map>
#include <vector>
 
namespace assets {
 
class PackArchive {
public:
  explicit PackArchive(const std::filesystem::path& path);
 
  [[nodiscard]]
  auto read(std::string_view rel_path) const -> std::optional<std::vector<uint8_t>>;
 
  [[nodiscard]]
  auto path() const -> const std::filesystem::path& {
    return m_path;
  }
 
  [[nodiscard]]
  auto entryCount() const -> std::size_t {
    return m_entries.size();
  }
 
private:
  static constexpr uint8_t k_flag_compressed = 1;
 
  struct Entry {
    std::string rel_path;
    uint64_t offset;
    uint64_t orig_size;
    uint64_t stored_size;
    uint8_t flags;
  };
 
  static auto fnv1a64(std::string_view s) -> uint64_t;
 
  std::filesystem::path m_path;
  std::unordered_map<uint64_t, Entry> m_entries;
};
 
}