Move Preload() code to MappedFile

net/disk_cache/blockfile/backend_impl.cc

 // 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.
 
 #include "net/disk_cache/blockfile/backend_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 1267 matching lines @@
 
   bool ret = true;
   if (*file_created)
     ret = CreateBackingStore(file.get());
 
   file = NULL;
   if (!ret)
     return false;
 
   index_ = new MappedFile();
-  data_ = reinterpret_cast<Index*>(index_->Init(index_name, 0));
+  data_ = static_cast<Index*>(index_->Init(index_name, 0));
   if (!data_) {
     LOG(ERROR) << "Unable to map Index file";
     return false;
   }
 
   if (index_->GetLength() < sizeof(Index)) {
     // We verify this again on CheckIndex() but it's easier to make sure now
     // that the header is there.
     LOG(ERROR) << "Corrupt Index file";
     return false;
@@ skipping 710 matching lines @@
 #endif
 
   if (data_->header.num_entries < 0) {
     LOG(ERROR) << "Invalid number of entries";
     return false;
   }
 
   if (!mask_)
     mask_ = data_->header.table_len - 1;
 
-  // Load the table into memory with a single read.
-  scoped_ptr<char[]> buf(new char[current_size]);
-  return index_->Read(buf.get(), current_size, 0);
+  // Load the table into memory.
+  return index_->Preload();
 }
 
 int BackendImpl::CheckAllEntries() {
   int num_dirty = 0;
   int num_entries = 0;
   DCHECK(mask_ < kuint32max);
   for (unsigned int i = 0; i <= mask_; i++) {
     Addr address(data_->table[i]);
     if (!address.is_initialized())
       continue;
@@ skipping 59 matching lines @@
     if (total_memory > kMaxBuffersSize || total_memory <= 0)
       total_memory = kMaxBuffersSize;
 
     done = true;
   }
 
   return static_cast<int>(total_memory);
 }
 
 }  // namespace disk_cache