Add Cache size to the Simple Index.

net/disk_cache/simple/simple_disk_format.h

 // Copyright (c) 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 NET_DISK_CACHE_SIMPLE_SIMPLE_DISK_FORMAT_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_DISK_FORMAT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 38 matching lines @@
 //    }
 // -------------------------
 //    struct Footer;
 // -------------------------
 namespace SimpleIndexFile {
   // Simple Index File metadata is defined here.
   struct Header {
     uint64 initial_magic_number;
     uint32 version;
     uint64 number_of_entries;
+    uint64 cache_size;  // Total cache storage size in bytes.
   };
 
   // We must keep this struct a POD.
   struct EntryMetadata {
     EntryMetadata();
-    EntryMetadata(const std::string& hash_key_p, base::Time last_used_time_p);
+    EntryMetadata(const std::string& hash_key_p,
+                  base::Time last_used_time_p,
+                  uint64 entry_size_p);
 
     base::Time GetLastUsedTime() const;
     std::string GetHashKey() const;
     void SetLastUsedTime(const base::Time& last_used_time_p);
 
     static void Serialize(const EntryMetadata& in_entry_metadata,
                           std::string* out_buffer);
 
     static void DeSerialize(const char* in_buffer,
                             EntryMetadata* out_entry_metadata);
 
     char hash_key[kEntryHashKeySize];  // Not a c_string, not null terminated.
 
     // This is the serialized format from Time::ToInternalValue().
     // If you want to make calculations/comparisons, you should use the
     // base::Time() class. Use the GetLastUsedTime() method above.
     int64 last_used_time;
+
+    uint64 entry_size;  // Storage size in bytes.
   };
 
   const size_t kEntryMetadataSize = sizeof(EntryMetadata);
 
   struct Footer {
     uint32 crc;
   };
 
 }  // namespace SimpleIndexFile
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_DISK_FORMAT_H_