Simple PMP reader to parse Picasa's metadata

webkit/fileapi/media/picasa/pmp_table_reader.h

Index: webkit/fileapi/media/picasa/pmp_table_reader.h
diff --git a/webkit/fileapi/media/picasa/pmp_table_reader.h b/webkit/fileapi/media/picasa/pmp_table_reader.h
new file mode 100644
index 0000000000000000000000000000000000000000..4dd374dfb66e251c0ada492d5e68455000afcc74
--- /dev/null
+++ b/webkit/fileapi/media/picasa/pmp_table_reader.h
@@ -0,0 +1,54 @@
+// Copyright 2013 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 WEBKIT_FILEAPI_MEDIA_PICASA_PMP_TABLE_READER_H_
+#define WEBKIT_FILEAPI_MEDIA_PICASA_PMP_TABLE_READER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace fileapi {
+
+class PmpColumnReader;
+
+class PmpTableReader {
+ public:
+  explicit PmpTableReader();

[vandebo (ex-Chrome), 2013/03/27 00:06:19]

explicit is only needed for exactly one arg.

[tommycli, 2013/03/27 19:34:30]

Done.

+
+  virtual ~PmpTableReader();
+
+  // |columns| parameter will define, in-order, the columns returned by
+  // subsequent columns to GetColumns() if ReadFromDisk() succeeds.
+  // Warning: Invalidates previously obtained pointers from GetColumns().
+  bool ReadFromDisk(

[vandebo (ex-Chrome), 2013/03/27 00:06:19]

Why not put all these args in the constructor?

[vandebo (ex-Chrome), 2013/03/27 00:06:19]

If this interface reads from disk, it seems like the column reader should also
read from disk?

[tommycli, 2013/03/27 19:34:30]

Done.

[tommycli, 2013/03/27 19:34:30]

Done.

+      const std::string& table_name,
+      const base::FilePath& directory_path,
+      const std::vector<std::string>& columns);
+
+  // Returns a const "view" of the current contents of |column_readers_|.
+  // Warning: Calling ReadFromDisk() will invalidate pointers returned here.
+  std::vector<const PmpColumnReader*> GetColumns() const;
+
+  uint32 Count() const;

[vandebo (ex-Chrome), 2013/03/27 00:06:19]

ColumnCount?

[tommycli, 2013/03/27 19:34:30]

Done.

+
+ private:
+  static void FreeAndClearContents(std::vector<PmpColumnReader*> readers);
+
+  // Contains the last 'good' read of the disk.
+  std::vector<PmpColumnReader*> column_readers_;

[vandebo (ex-Chrome), 2013/03/27 00:06:19]

probably want to use base/memory/scoped_vector.h here.

[tommycli, 2013/03/27 19:34:30]

Yep! That's what I want. Btw - awesome that it implements a 'move' in C++03.

+  // Contains the number of rows obtained during the last 'good' read of disk.
+  uint32 max_row_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(PmpTableReader);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_MEDIA_PICASA_PMP_TABLE_READER_H_