A bunch of remaining parts of extension content verification (Reland)

extensions/browser/computed_hashes.h

Index: extensions/browser/computed_hashes.h
diff --git a/extensions/browser/computed_hashes.h b/extensions/browser/computed_hashes.h
new file mode 100644
index 0000000000000000000000000000000000000000..c68175c8d2c832107335eb4d8abd60266b23540f
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+++ b/extensions/browser/computed_hashes.h
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+// Copyright 2014 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.
+
+#ifndef EXTENSIONS_BROWSER_COMPUTED_HASHES_H_
+#define EXTENSIONS_BROWSER_COMPUTED_HASHES_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/values.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace extensions {
+
+// A pair of classes for serialization of a set of SHA256 block hashes computed
+// over the files inside an extension.
+class ComputedHashes {
+ public:
+  class Reader {
+   public:
+    Reader();
+    ~Reader();
+    bool InitFromFile(const base::FilePath& path);
+
+    // The block size and hashes for |relative_path| will be copied into the
+    // out parameters.
+    bool GetHashes(const base::FilePath& relative_path,
+                   int* block_size,
+                   std::vector<std::string>* hashes);
+
+   private:
+    typedef std::pair<int, std::vector<std::string> > HashInfo;
+
+    // This maps a relative path to a pair of (block size, hashes)
+    std::map<base::FilePath, HashInfo> data_;
+  };
+
+  class Writer {
+   public:
+    Writer();
+    ~Writer();
+
+    // Adds hashes for |relative_path|. Should not be called more than once
+    // for a given |relative_path|.
+    void AddHashes(const base::FilePath& relative_path,
+                   int block_size,
+                   const std::vector<std::string>& hashes);
+
+    bool WriteToFile(const base::FilePath& path);
+
+   private:
+    // The top-level object that will be serialized as JSON.
+    base::ListValue file_list_;
+  };
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_COMPUTED_HASHES_H_