archive static method

Future<MediaType?> archive(SnifferContext context)

Sniffs a simple Archive-based MediaType, like Comic Book Archive or Zipped Audio Book.

Reference: https://wiki.mobileread.com/wiki/CBR_and_CBZ

Implementation

static Future<MediaType?> archive(SnifferContext context) async {
  if (context.hasFileExtension(["cbz"]) ||
      context.hasAnyOfMediaTypes([
        "application/vnd.comicbook+zip",
        "application/x-cbz",
        "application/x-cbr"
      ])) {
    return MediaType.cbz;
  }
  if (context.hasFileExtension(["zab"])) {
    return MediaType.zab;
  }

  if (await context.contentAsArchive() != null) {
    bool isIgnored(ArchiveEntry entry, File file) => basename(file.path)
        .let((name) => name.startsWith(".") || name == "Thumbs.db");

    Future<bool> archiveContainsOnlyExtensions(
            List<String> fileExtensions) async =>
        await context.archiveEntriesAllSatisfy((entry) {
          File file = File(entry.path);
          return isIgnored(entry, file) ||
              fileExtensions.contains(file.path.extension().toLowerCase());
        });
    if (await archiveContainsOnlyExtensions(cbzExtensions)) {
      return MediaType.cbz;
    }
    if (await archiveContainsOnlyExtensions(zabExtensions)) {
      return MediaType.zab;
    }
  }
  return null;
}