zip_asset_store.h

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FLUTTER_ASSETS_ZIP_ASSET_STORE_H_
#define FLUTTER_ASSETS_ZIP_ASSET_STORE_H_

#include <map>

#include "flutter/assets/asset_resolver.h"
#include "flutter/fml/macros.h"
#include "third_party/zlib/contrib/minizip/unzip.h"

namespace flutter {

struct UniqueUnzipperTraits {
  static inline void* InvalidValue() { return nullptr; }
  static inline bool IsValid(void* value) { return value != InvalidValue(); }
  static void Free(void* file);
};

using UniqueUnzipper = fml::UniqueObject<void*, UniqueUnzipperTraits>;

class ZipAssetStore final : public AssetResolver {
 public:
  ZipAssetStore(std::string file_path, std::string directory);

  ~ZipAssetStore() override;

 private:
  struct CacheEntry {
    unz_file_pos file_pos;
    size_t uncompressed_size;
    CacheEntry(unz_file_pos p_file_pos, size_t p_uncompressed_size)
        : file_pos(p_file_pos), uncompressed_size(p_uncompressed_size) {}
  };

  const std::string file_path_;
  const std::string directory_;

  mutable std::map<std::string, CacheEntry> stat_cache_;

  // |AssetResolver|
  bool IsValid() const override;

  // |AssetResolver|
  std::unique_ptr<fml::Mapping> GetAsMapping(
      const std::string& asset_name) const override;

  void BuildStatCache();

  UniqueUnzipper CreateUnzipper() const;

  FML_DISALLOW_COPY_AND_ASSIGN(ZipAssetStore);
};

}  // namespace flutter

#endif  // FLUTTER_ASSETS_ZIP_ASSET_STORE_H_