1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/extras/mmap.h b/third_party/jpeg-xl/lib/extras/mmap.h
new file mode 100644
index 0000000000..8bc023dec0
--- /dev/null
+++ b/third_party/jpeg-xl/lib/extras/mmap.h
@@ -0,0 +1,31 @@
+// Copyright (c) the JPEG XL Project 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 LIB_EXTRAS_MMAP_H_
+#define LIB_EXTRAS_MMAP_H_
+
+#include <memory>
+
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+struct MemoryMappedFileImpl;
+
+class MemoryMappedFile {
+ public:
+  static StatusOr<MemoryMappedFile> Init(const char* path);
+  const uint8_t* data() const;
+  size_t size() const;
+  MemoryMappedFile();
+  ~MemoryMappedFile();
+  MemoryMappedFile(MemoryMappedFile&&) noexcept;
+  MemoryMappedFile& operator=(MemoryMappedFile&&) noexcept;
+
+ private:
+  std::unique_ptr<MemoryMappedFileImpl> impl_;
+};
+}  // namespace jxl
+
+#endif