Disk cache: Reference CL for the implementation of file format version 3.

net/disk_cache/storage_block-inl.h

 // Copyright (c) 2012 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_STORAGE_BLOCK_INL_H_
 #define NET_DISK_CACHE_STORAGE_BLOCK_INL_H_
 
 #include "net/disk_cache/storage_block.h"
 
 #include "base/hash.h"
 #include "base/logging.h"
 #include "net/disk_cache/trace.h"
 
 namespace disk_cache {
 
+template<typename T> StorageBlock<T>::StorageBlock()
+    : data_(NULL),
+      file_(NULL),
+      modified_(false),
+      own_data_(false),
+      extended_(false) {
+}
+
 template<typename T> StorageBlock<T>::StorageBlock(MappedFile* file,
                                                    Addr address)
     : data_(NULL), file_(file), address_(address), modified_(false),
       own_data_(false), extended_(false) {
   if (address.num_blocks() > 1)
     extended_ = true;
   DCHECK(!address.is_initialized() || sizeof(*data_) == address.BlockSize());
 }
 
 template<typename T> StorageBlock<T>::~StorageBlock() {
@@ skipping 65 matching lines @@
 template<typename T> void StorageBlock<T>::clear_modified() {
   modified_ = false;
 }
 
 template<typename T> T* StorageBlock<T>::Data() {
   if (!data_)
     AllocateData();
   return data_;
 }
 
+template<typename T> T* StorageBlock<T>::ReleaseData() {
+  if (!own_data_ || !data_)
+    return NULL;
+
+  data_->self_hash = CalculateHash();
+  T* result = data_;
+  data_ = NULL;
+  own_data_ = false;
+  modified_ = false;
+  return result;
+}
+
 template<typename T> bool StorageBlock<T>::HasData() const {
   return (NULL != data_);
 }
 
 template<typename T> bool StorageBlock<T>::VerifyHash() const {
   uint32 hash = CalculateHash();
   return (!data_->self_hash || data_->self_hash == hash);
 }
 
+template<typename T> void StorageBlock<T>::UpdateHash() {
+  data_->self_hash = CalculateHash();
+}
+
 template<typename T> bool StorageBlock<T>::own_data() const {
   return own_data_;
 }
 
 template<typename T> const Addr StorageBlock<T>::address() const {
   return address_;
 }
 
 template<typename T> bool StorageBlock<T>::Load() {
   if (file_) {
@@ skipping 16 matching lines @@
     if (file_->Store(this)) {
       modified_ = false;
       return true;
     }
   }
   LOG(ERROR) << "Failed data store.";
   Trace("Failed data store.");
   return false;
 }
 
+template<typename T> bool StorageBlock<T>::Load(FileIOCallback* callback,
+                                                bool* completed) {
+  if (file_) {
+    if (!data_)
+      AllocateData();
+
+    if (file_->Load(this, callback, completed)) {
+      modified_ = false;
+      return true;
+    }
+  }
+  LOG(WARNING) << "Failed data load.";
+  Trace("Failed data load.");
+  return false;
+}
+
+template<typename T> bool StorageBlock<T>::Store(FileIOCallback* callback,
+                                                 bool* completed) {
+  if (file_ && data_) {
+    data_->self_hash = CalculateHash();
+    if (file_->Store(this, callback, completed)) {
+      modified_ = false;
+      return true;
+    }
+  }
+  LOG(ERROR) << "Failed data store.";
+  Trace("Failed data store.");
+  return false;
+}
+
 template<typename T> void StorageBlock<T>::AllocateData() {
   DCHECK(!data_);
   if (!extended_) {
     data_ = new T;
   } else {
     void* buffer = new char[address_.num_blocks() * sizeof(*data_)];
     data_ = new(buffer) T;
   }
   own_data_ = true;
 }
@@ skipping 10 matching lines @@
   }
 }
 
 template<typename T> uint32 StorageBlock<T>::CalculateHash() const {
   return base::Hash(reinterpret_cast<char*>(data_), offsetof(T, self_hash));
 }
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_STORAGE_BLOCK_INL_H_