Data pack file reader and unit test, used for resources on Linux.

See http://dev.chromium.org/developers/design-documents/linuxresourcesandlocalizedstrings for more details.

Review URL: http://codereview.chromium.org/17253


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7751 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 46 insertions, 0 deletions

diff --git a/base/data_pack.h b/base/data_pack.h
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+++ b/base/data_pack.h
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+// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// DataPack represents a read-only view onto an on-disk file that contains
+// (key, value) pairs of data.  It's used to store static resources like
+// translation strings and images.
+
+#ifndef BASE_DATA_PACK_H_
+#define BASE_DATA_PACK_H_
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+
+namespace file_util {
+  class MemoryMappedFile;
+}
+class FilePath;
+class StringPiece;
+
+namespace base {
+
+class DataPack {
+ public:
+  DataPack();
+  ~DataPack();
+
+  // Load a pack file from |path|, returning false on error.
+  bool Load(const FilePath& path);
+
+  // Get resource by id |resource_id|, filling in |data|.
+  // The data is owned by the DataPack object and should not be modified.
+  // Returns false if the resource id isn't found.
+  bool Get(uint32_t resource_id, StringPiece* data);
+
+ private:
+  // The memory-mapped data.
+  scoped_ptr<file_util::MemoryMappedFile> mmap_;
+
+  // Number of resources in the data.
+  size_t resource_count_;
+};
+
+}  // namespace base
+
+#endif  // BASE_DATA_PACK_H_