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

net/disk_cache/mapped_file_win.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/mapped_file.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/disk_cache/disk_cache.h"
@@ skipping 10 matching lines @@
   section_ = CreateFileMapping(platform_file(), NULL, PAGE_READWRITE, 0,
                                static_cast<DWORD>(size), NULL);
   if (!section_)
     return NULL;
 
   buffer_ = MapViewOfFile(section_, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, size);
   DCHECK(buffer_);
   view_size_ = size;
 
   // Make sure we detect hardware failures reading the headers.
-  size_t temp_len = size ? size : 4096;
+  /*size_t temp_len = size ? size : 4096;
   scoped_ptr<char[]> temp(new char[temp_len]);
   if (!Read(temp.get(), temp_len, 0))
-    return NULL;
+    return NULL;*/
 
   return buffer_;
 }
 
+bool MappedFile::InitNoMap(const base::FilePath& name) {
+  DCHECK(!init_);
+  if (init_ || !File::Init(name))
+    return false;
+
+  buffer_ = NULL;
+  section_ = NULL;
+  view_size_ = 0;
+  init_ = true;
+  return true;
+}
+
 MappedFile::~MappedFile() {
   if (!init_)
     return;
 
   if (buffer_) {
     BOOL ret = UnmapViewOfFile(buffer_);
     DCHECK(ret);
   }
 
   if (section_)
     CloseHandle(section_);
 }
 
-bool MappedFile::Load(const FileBlock* block) {
-  size_t offset = block->offset() + view_size_;
-  return Read(block->buffer(), block->size(), offset);
-}
-
-bool MappedFile::Store(const FileBlock* block) {
-  size_t offset = block->offset() + view_size_;
-  return Write(block->buffer(), block->size(), offset);
-}
-
 void MappedFile::Flush() {
 }
 
 }  // namespace disk_cache