// Copyright 2008, Google Inc.
//
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//
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//     this list of conditions and the following disclaimer.
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//     used to endorse or promote products derived from this software without
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#ifndef GEARS_DESKTOP_FILE_BLOB_H__
#define GEARS_DESKTOP_FILE_BLOB_H__

#ifdef OFFICIAL_BUILD
// The blob API has not been finalized for official builds
#else

#include "gears/base/common/file.h"
#include "gears/base/common/mutex.h"
#include "gears/base/common/string16.h"
#include "gears/blob/blob_interface.h"
#include "third_party/scoped_ptr/scoped_ptr.h"

class File;

class FileBlob : public BlobInterface {
 public:
  // The filename should be an absolute path, not a relative one.
  // If it is not valid, Read() and Length() will return -1.
  FileBlob(const std::string16& filename);

  // FileBlob will assume ownership of the File object and will delete
  // it when FileBlob is deleted.
  FileBlob(File *file);

  int64 Read(uint8 *destination, int64 offset, int64 max_bytes) const;

  int64 Length() const;

 private:
  mutable Mutex file_lock_;
  scoped_ptr<File> file_;

  DISALLOW_EVIL_CONSTRUCTORS(FileBlob);
};

#endif  // not OFFICIAL_BUILD

#endif  // GEARS_DESKTOP_FILE_BLOB_H__