Merge "Expose file utility classes for consumption" am: b4da837b58

Original change: https://android-review.googlesource.com/c/platform/external/bsdiff/+/1917558

Change-Id: I35f736bdd4bca37e0508ee13d8d002e4c970e649

1 files changed, 39 insertions, 0 deletions

diff --git a/include/bsdiff/file.h b/include/bsdiff/file.h
new file mode 100644
index 0000000..959c53e
--- /dev/null
+++ b/include/bsdiff/file.h
@@ -0,0 +1,39 @@
+// Copyright 2015 The Chromium OS 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 _BSDIFF_FILE_H_
+#define _BSDIFF_FILE_H_
+
+#include <memory>
+
+#include "bsdiff/file_interface.h"
+
+namespace bsdiff {
+
+class File : public FileInterface {
+ public:
+  // Opens a file |pathname| with flags |flags| as defined by open(2). In case
+  // of error, an empty unique_ptr is returned and errno is set accordingly.
+  static std::unique_ptr<File> FOpen(const char* pathname, int flags);
+
+  ~File() override;
+
+  // FileInterface overrides.
+  bool Read(void* buf, size_t count, size_t* bytes_read) override;
+  bool Write(const void* buf, size_t count, size_t* bytes_written) override;
+  bool Seek(off_t pos) override;
+  bool Close() override;
+  bool GetSize(uint64_t* size) override;
+
+ private:
+  // Creates the File instance for the |fd|. Takes ownership of the file
+  // descriptor.
+  explicit File(int fd);
+
+  int fd_;
+};
+
+}  // namespace bsdiff
+
+#endif  // _BSDIFF_FILE_H_