Method build

source/base/StarPackedAssetSource.cpp:11–69

namespace Star {

void PackedAssetSource::build(DirectoryAssetSource& directorySource, String const& targetPackedFile,
    StringList const& extensionSorting, BuildProgressCallback progressCallback) {
  FilePtr file = File::open(targetPackedFile, IOMode::ReadWrite | IOMode::Truncate);

  DataStreamIODevice ds(file);

  ds.writeData("SBAsset6", 8);
  // Skip 8 bytes, this will be a pointer to the index once we are done.
  ds.seek(8, IOSeek::Relative);

  // Insert every found entry into the packed file, and also simultaneously
  // compute the full index.
  StringMap<pair<uint64_t, uint64_t>> index;

  OrderedHashSet<String> extensionOrdering;
  for (auto const& str : extensionSorting)
    extensionOrdering.add(str.toLower());

  StringList assetPaths = directorySource.assetPaths();

  // Returns a value for the asset that can be used to predictably sort assets
  // by name and then by extension, where every extension listed in
  // "extensionSorting" will come first, and then any extension not listed will
  // come after.
  auto getOrderingValue = [&extensionOrdering](String const& asset) -> pair<size_t, String> {
    String extension;
    auto lastDot = asset.findLast(".");
    if (lastDot != NPos)
      extension = asset.substr(lastDot + 1);

    if (auto i = extensionOrdering.indexOf(extension.toLower())) {
      return {*i, asset.toLower()};
    } else {
      return {extensionOrdering.size(), asset.toLower()};
    }
  };

  assetPaths.sort([&getOrderingValue](String const& a, String const& b) {
      return getOrderingValue(a) < getOrderingValue(b);
    });

  for (size_t i = 0; i < assetPaths.size(); ++i) {
    String const& assetPath = assetPaths[i];
    ByteArray contents = directorySource.read(assetPath);

    if (progressCallback)
      progressCallback(i, assetPaths.size(), directorySource.toFilesystem(assetPath), assetPath);
    index.add(assetPath, {ds.pos(), contents.size()});
    ds.writeBytes(contents);
  }

  uint64_t indexStart = ds.pos();
  ds.writeData("INDEX", 5);
  ds.write(directorySource.metadata());
  ds.write(index);

  ds.seek(8);
  ds.write(indexStart);