Refactor our SimpleIndex file format and serialization to use Pickle instead of the previously bugg…

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"
-#include "base/port.h"
 
 namespace base {
 class Time;
 }
 
 namespace disk_cache {
 
 const uint64 kSimpleInitialMagicNumber = GG_UINT64_C(0xfcfb6d1ba7725c30);

[gavinp, 2013/04/15 15:40:54]

Good to rename this file to simple_entry_format.h maybe?

-const uint64 kSimpleIndexInitialMagicNumber = GG_UINT64_C(0x656e74657220796f);
 
 // A file in the Simple cache consists of a SimpleFileHeader followed
 // by data.
 
 const uint32 kSimpleVersion = 1;
 
 static const int kSimpleEntryFileCount = 3;
 
 struct SimpleFileHeader {
   uint64 initial_magic_number;
   uint32 version;
   uint32 key_length;
   uint32 key_hash;
 };
 
-// Simple Index File sketch:
-// This is based on the struct Header and Footer as seem below, and the struct
-// alignment is platform dependent.
-// The CRC check is a guarantee that we don't read incorrect values.
-// -------------------------
-//    struct Header;
-// -------------------------
-//    Repeated |size| times {
-//       struct EntryMetadata;
-//    }
-// -------------------------
-//    struct Footer;
-// -------------------------
-namespace SimpleIndexFile {
-  // Simple Index File metadata is defined here.
-  struct Header {
-    Header();
-    uint64 initial_magic_number;
-    uint32 version;
-    uint64 number_of_entries;
-    uint64 cache_size;  // Total cache storage size in bytes.
-  };
-
-  // TODO(felipeg): At some point we should consider using a protobuffer.  See
-  // that we are re-implementing most of protobuffer's functionality such as
-  // Serialize and Merge.
-  // We must keep this struct a POD.
-  struct EntryMetadata {
-    EntryMetadata();
-    EntryMetadata(uint64 hash_key_p,
-                  base::Time last_used_time_p,
-                  uint64 entry_size_p);
-
-    base::Time GetLastUsedTime() const;
-    uint64 GetHashKey() const;
-    void SetLastUsedTime(const base::Time& last_used_time_p);
-
-    // Serialize the data from |in_entry_metadata| and appends the bytes in
-    // |out_buffer|. The serialization is platform dependent since it simply
-    // writes the whole struct from memory into the given buffer.
-    static void Serialize(const EntryMetadata& in_entry_metadata,
-                          std::string* out_buffer);
-
-    static void DeSerialize(const char* in_buffer,
-                            EntryMetadata* out_entry_metadata);
-
-    // Merge two EntryMetadata instances.
-    // The existing valid data in |out_entry_metadata| will prevail.
-    static void Merge(const EntryMetadata& entry_metadata,
-                      EntryMetadata* out_entry_metadata);
-
-    uint64 hash_key;
-
-    // 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 {
-    Footer();
-    uint32 crc;
-  };
-
-}  // namespace SimpleIndexFile
-
-// Size of the uint64 hash_key number in Hex format in a string.
-const size_t kEntryHashKeyAsHexStringSize = 2 * sizeof(
-    SimpleIndexFile::EntryMetadata::hash_key);
-
-std::string ConvertEntryHashKeyToHexString(uint64 hash_key);
-
-// |key| is the regular HTTP Cache key, which is a URL.
-// Returns the Hex ascii representation of the uint64 hash_key.
-std::string GetEntryHashKeyAsHexString(const std::string& key);
-
-// |key| is the regular HTTP Cache key, which is a URL.
-// Returns the hash of the key as uint64.
-uint64 GetEntryHashKey(const std::string& key);
-
-// Parses the |hash_key| string into a uint64 buffer.
-// |hash_key| string must be of the form: FFFFFFFFFFFFFFFF .
-bool GetEntryHashKeyFromHexString(const std::string& hash_key,
-                                  uint64* hash_key_out);
-
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_DISK_FORMAT_H_