Simple PMP reader to parse Picasa's metadata

webkit/fileapi/media/picasa/pmp_constants.h

Index: webkit/fileapi/media/picasa/pmp_constants.h
diff --git a/webkit/fileapi/media/picasa/pmp_constants.h b/webkit/fileapi/media/picasa/pmp_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..afd3c7e477eba961ac0ae35a0cccbe4ae3ef9e9c
--- /dev/null
+++ b/webkit/fileapi/media/picasa/pmp_constants.h
@@ -0,0 +1,44 @@
+// 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_CONSTANTS_H_
+#define WEBKIT_FILEAPI_MEDIA_PICASA_PMP_CONSTANTS_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace fileapi {
+
+// PMP file format.
+// Info derived from: http://sbktech.blogspot.com/2011/12/picasa-pmp-format.html
+
+const std::string kPmpExtension = "pmp";
+
+const size_t kPmpHeaderSize = 20;
+
+const int kPmpMagic1Offset = 0;
+const int kPmpMagic2Offset = 6;
+const int kPmpMagic3Offset = 8;
+const int kPmpMagic4Offset = 14;
+
+const uint32 kPmpMagic1 = 0x3fcccccd;
+const uint16 kPmpMagic2 = 0x1332;
+const uint32 kPmpMagic3 = 0x00000002;
+const uint16 kPmpMagic4 = 0x1332;
+
+const int kPmpFieldType1Offset = 4;
+const int kPmpFieldType2Offset = 12;
+const int kPmpRowCountOffset   = 16;
+
+const uint16 kPmpFieldTypeString   = 0x00;

[vandebo (ex-Chrome), 2013/03/29 21:35:07]

It might clean up some interfaces if you make this an enum.

[tommycli, 2013/04/01 22:19:18]

For now, I want the types of field types to be uint16, so they match what's
serialized in the file.

[vandebo (ex-Chrome), 2013/04/02 18:10:55]

It will be a bit of extra code to convert what comes out of the file into the
enum value, but I think it'll be a win in terms of readability of the
interfaces.

[tommycli, 2013/04/02 21:12:36]

Done.

+const uint16 kPmpFieldTypeUInt32   = 0x01;
+const uint16 kPmpFieldTypeDouble64 = 0x02;
+const uint16 kPmpFieldTypeUInt8    = 0x03;
+const uint16 kPmpFieldTypeUInt64   = 0x04;
+const uint16 kPmpFieldTypeInvalid  = 0xff;
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_MEDIA_PICASA_PMP_CONSTANTS_H_