1 files changed, 51 insertions, 0 deletions
diff --git a/examples/file_reader_factory.cc b/examples/file_reader_factory.cc
new file mode 100644
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--- /dev/null
+++ b/examples/file_reader_factory.cc
@@ -0,0 +1,51 @@
+// Copyright 2019 The libgav1 Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "examples/file_reader_factory.h"
+
+#include <new>
+
+#include "examples/logging.h"
+
+namespace libgav1 {
+namespace {
+
+std::vector<FileReaderFactory::OpenFunction>* GetFileReaderOpenFunctions() {
+  static auto* open_functions =
+      new (std::nothrow) std::vector<FileReaderFactory::OpenFunction>();
+  return open_functions;
+}
+
+}  // namespace
+
+bool FileReaderFactory::RegisterReader(OpenFunction open_function) {
+  if (open_function == nullptr) return false;
+  auto* open_functions = GetFileReaderOpenFunctions();
+  const size_t num_readers = open_functions->size();
+  open_functions->push_back(open_function);
+  return open_functions->size() == num_readers + 1;
+}
+
+std::unique_ptr<FileReaderInterface> FileReaderFactory::OpenReader(
+    const std::string& file_name, const bool error_tolerant /*= false*/) {
+  for (auto* open_function : *GetFileReaderOpenFunctions()) {
+    auto reader = open_function(file_name, error_tolerant);
+    if (reader == nullptr) continue;
+    return reader;
+  }
+  LIBGAV1_EXAMPLES_LOG_ERROR("No file reader able to open input");
+  return nullptr;
+}
+
+}  // namespace libgav1