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

net/disk_cache/simple/simple_disk_format.cc

-// 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.
-
-#include "net/disk_cache/simple/simple_disk_format.h"
-
-#include "base/format_macros.h"
-#include "base/hash.h"
-#include "base/logging.h"
-#include "base/sha1.h"
-#include "base/stringprintf.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/time.h"
-
-namespace disk_cache {
-
-SimpleFileHeader::SimpleFileHeader() {
-  // Make hashing repeatable: leave no padding bytes untouched.
-  memset(this, 0, sizeof(*this));
-}
-
-std::string ConvertEntryHashKeyToHexString(uint64 hash_key) {
-  const std::string hash_key_str = base::StringPrintf("%016" PRIx64, hash_key);
-  DCHECK_EQ(kEntryHashKeyAsHexStringSize, hash_key_str.size());
-  return hash_key_str;
-}
-
-std::string GetEntryHashKeyAsHexString(const std::string& key) {
-  std::string hash_key_str =
-      ConvertEntryHashKeyToHexString(GetEntryHashKey(key));
-  DCHECK_EQ(kEntryHashKeyAsHexStringSize, hash_key_str.size());
-  return hash_key_str;
-}
-
-bool GetEntryHashKeyFromHexString(const std::string& hash_key,
-                                  uint64* hash_key_out) {
-  if (hash_key.size() != kEntryHashKeyAsHexStringSize) {
-    return false;
-  }
-  return base::HexStringToUInt64(hash_key, hash_key_out);
-}
-
-uint64 GetEntryHashKey(const std::string& key) {
-  const std::string sha_hash = base::SHA1HashString(key);
-  uint64 hash_key = 0;
-  sha_hash.copy(reinterpret_cast<char*>(&hash_key), sizeof(hash_key));
-  return hash_key;
-}
-
-namespace SimpleIndexFile {
-
-Footer::Footer() {
-  // Make hashing repeatable: leave no padding bytes untouched.
-  memset(this, 0, sizeof(*this));
-}
-
-Header::Header() {
-  // Make hashing repeatable: leave no padding bytes untouched.
-  memset(this, 0, sizeof(*this));
-}
-
-EntryMetadata::EntryMetadata() {
-  // Make hashing repeatable: leave no padding bytes untouched.
-  memset(this, 0, sizeof(*this));
-}
-
-EntryMetadata::EntryMetadata(uint64 hash_key_p,
-                             base::Time last_used_time_p,
-                             uint64 entry_size_p) {
-  // Make hashing repeatable: leave no padding bytes untouched.
-  memset(this, 0, sizeof(*this));
-
-  // Proceed with field initializations.
-  hash_key = hash_key_p;
-  entry_size = entry_size_p;
-  last_used_time = last_used_time_p.ToInternalValue();
-}
-
-uint64 EntryMetadata::GetHashKey() const {
-  return hash_key;
-}
-
-base::Time EntryMetadata::GetLastUsedTime() const {
-  return base::Time::FromInternalValue(last_used_time);
-}
-
-void EntryMetadata::SetLastUsedTime(const base::Time& last_used_time_p) {
-  last_used_time = last_used_time_p.ToInternalValue();
-}
-
-// static
-void EntryMetadata::Serialize(const EntryMetadata& in_entry_metadata,
-                              std::string* out_buffer) {
-  DCHECK(out_buffer);
-  // TODO(felipeg): We may choose to, instead, serialize each struct member
-  // separately.
-  out_buffer->append(reinterpret_cast<const char*>(&in_entry_metadata),
-                     kEntryMetadataSize);
-}
-
-// static
-void EntryMetadata::DeSerialize(const char* in_buffer,
-                                EntryMetadata* out_entry_metadata) {
-  DCHECK(in_buffer);
-  DCHECK(out_entry_metadata);
-  memcpy(out_entry_metadata, in_buffer, kEntryMetadataSize);
-}
-
-// static
-void EntryMetadata::Merge(const EntryMetadata& from,
-                          EntryMetadata* to) {
-  if (to->last_used_time == 0)
-    to->last_used_time = from.last_used_time;
-  if (to->entry_size == 0)
-    to->entry_size = from.entry_size;
-}
-
-}  // namespace SimpleIndexFile
-
-}  // namespace disk_cache