[CacheStorage] Pad and bin opaque resource sizes.

content/browser/cache_storage/cache_storage_index.cc

 // Copyright 2016 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 "content/browser/cache_storage/cache_storage_index.h"
 
 #include <utility>
 
 namespace content {
 
 CacheStorageIndex::CacheStorageIndex()
-    : doomed_cache_metadata_("", CacheStorage::kSizeUnknown) {
+    : doomed_cache_metadata_("",
+                             CacheStorage::kSizeUnknown,
+                             CacheStorage::kSizeUnknown,
+                             "") {
   ClearDoomedCache();
 }
 
 CacheStorageIndex::~CacheStorageIndex() = default;
 
 CacheStorageIndex& CacheStorageIndex::operator=(CacheStorageIndex&& rhs) {
   DCHECK(!has_doomed_cache_);
   ordered_cache_metadata_ = std::move(rhs.ordered_cache_metadata_);
   cache_metadata_map_ = std::move(rhs.cache_metadata_map_);
   storage_size_ = rhs.storage_size_;
+  storage_padding_ = rhs.storage_padding_;
   rhs.storage_size_ = CacheStorage::kSizeUnknown;
+  rhs.storage_padding_ = CacheStorage::kSizeUnknown;
   return *this;
 }
 
 void CacheStorageIndex::Insert(const CacheMetadata& cache_metadata) {
   DCHECK(!has_doomed_cache_);
   DCHECK(cache_metadata_map_.find(cache_metadata.name) ==
          cache_metadata_map_.end());
   ordered_cache_metadata_.push_back(cache_metadata);
   cache_metadata_map_[cache_metadata.name] = --ordered_cache_metadata_.end();
   storage_size_ = CacheStorage::kSizeUnknown;
+  storage_padding_ = CacheStorage::kSizeUnknown;
 }
 
 void CacheStorageIndex::Delete(const std::string& cache_name) {
   DCHECK(!has_doomed_cache_);
   auto it = cache_metadata_map_.find(cache_name);
   DCHECK(it != cache_metadata_map_.end());
   ordered_cache_metadata_.erase(it->second);
   cache_metadata_map_.erase(it);
   storage_size_ = CacheStorage::kSizeUnknown;
+  storage_padding_ = CacheStorage::kSizeUnknown;
 }
 
 bool CacheStorageIndex::SetCacheSize(const std::string& cache_name,
                                      int64_t size) {
   if (has_doomed_cache_)
     DCHECK_NE(cache_name, doomed_cache_metadata_.name);
   auto it = cache_metadata_map_.find(cache_name);
   DCHECK(it != cache_metadata_map_.end());
   if (it->second->size == size)
     return false;
   it->second->size = size;
   storage_size_ = CacheStorage::kSizeUnknown;
   return true;
 }
 
-int64_t CacheStorageIndex::GetCacheSize(const std::string& cache_name) const {
+const CacheStorageIndex::CacheMetadata* CacheStorageIndex::GetMetadata(
+    const std::string& cache_name) const {
+  const auto& it = cache_metadata_map_.find(cache_name);
+  if (it == cache_metadata_map_.end())
+    return nullptr;
+  return &*it->second;
+}
+
+int64_t CacheStorageIndex::GetCacheSizeForTesting(
+    const std::string& cache_name) const {
   const auto& it = cache_metadata_map_.find(cache_name);
   if (it == cache_metadata_map_.end())
     return CacheStorage::kSizeUnknown;
   return it->second->size;
 }
 
-int64_t CacheStorageIndex::GetStorageSize() {
+bool CacheStorageIndex::SetCachePadding(const std::string& cache_name,
+                                        int64_t padding) {
+  DCHECK(!has_doomed_cache_ || cache_name == doomed_cache_metadata_.name)
+      << cache_name << " != " << doomed_cache_metadata_.name;
+  auto it = cache_metadata_map_.find(cache_name);
+  DCHECK(it != cache_metadata_map_.end());
+  if (it->second->padding == padding)
+    return false;
+  it->second->padding = padding;
+  storage_padding_ = CacheStorage::kSizeUnknown;
+  return true;
+}
+
+int64_t CacheStorageIndex::GetCachePaddingForTesting(
+    const std::string& cache_name) const {
+  const auto& it = cache_metadata_map_.find(cache_name);
+  if (it == cache_metadata_map_.end())
+    return CacheStorage::kSizeUnknown;
+  return it->second->padding;
+}
+
+int64_t CacheStorageIndex::GetPaddedStorageSize() {
   if (storage_size_ == CacheStorage::kSizeUnknown)
     UpdateStorageSize();
-  return storage_size_;
+  if (storage_padding_ == CacheStorage::kSizeUnknown)
+    CalculateStoragePadding();
+  if (storage_size_ == CacheStorage::kSizeUnknown ||
+      storage_padding_ == CacheStorage::kSizeUnknown) {
+    return CacheStorage::kSizeUnknown;
+  }
+  return storage_size_ + storage_padding_;
 }
 
 void CacheStorageIndex::UpdateStorageSize() {
   int64_t storage_size = 0;
   storage_size_ = CacheStorage::kSizeUnknown;
   for (const CacheMetadata& info : ordered_cache_metadata_) {
     if (info.size == CacheStorage::kSizeUnknown)
       return;
     storage_size += info.size;
   }
   storage_size_ = storage_size;
 }
 
+void CacheStorageIndex::CalculateStoragePadding() {
+  int64_t storage_padding = 0;
+  storage_padding_ = CacheStorage::kSizeUnknown;
+  for (const CacheMetadata& info : ordered_cache_metadata_) {
+    if (info.padding == CacheStorage::kSizeUnknown)
+      return;
+    storage_padding += info.padding;
+  }
+  storage_padding_ = storage_padding;
+}
+
 void CacheStorageIndex::DoomCache(const std::string& cache_name) {
   DCHECK(!has_doomed_cache_);
   auto map_it = cache_metadata_map_.find(cache_name);
   DCHECK(map_it != cache_metadata_map_.end());
   doomed_cache_metadata_ = std::move(*(map_it->second));
   after_doomed_cache_metadata_ = ordered_cache_metadata_.erase(map_it->second);
   cache_metadata_map_.erase(map_it);
   storage_size_ = CacheStorage::kSizeUnknown;
+  storage_padding_ = CacheStorage::kSizeUnknown;
   has_doomed_cache_ = true;
 }
 
 void CacheStorageIndex::FinalizeDoomedCache() {
   DCHECK(has_doomed_cache_);
   ClearDoomedCache();
 }
 
 void CacheStorageIndex::RestoreDoomedCache() {
   DCHECK(has_doomed_cache_);
   const auto cache_name = doomed_cache_metadata_.name;
   cache_metadata_map_[cache_name] = ordered_cache_metadata_.insert(
       after_doomed_cache_metadata_, std::move(doomed_cache_metadata_));
   after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
   storage_size_ = CacheStorage::kSizeUnknown;
+  storage_padding_ = CacheStorage::kSizeUnknown;
   ClearDoomedCache();
 }
 
 void CacheStorageIndex::ClearDoomedCache() {
   doomed_cache_metadata_.name.clear();
   after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
   has_doomed_cache_ = false;
 }
 
 }  // namespace content