| // 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/file_path.h" |
| #include "base/logging.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "net/disk_cache/disk_cache.h" |
| |
| namespace disk_cache { |
| |
| void* MappedFile::Init(const FilePath& name, size_t size) { |
| DCHECK(!init_); |
| if (init_ || !File::Init(name)) |
| return NULL; |
| |
| buffer_ = NULL; |
| init_ = true; |
| 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; |
| scoped_array<char> temp(new char[temp_len]); |
| if (!Read(temp.get(), temp_len, 0)) |
| return NULL; |
| |
| return buffer_; |
| } |
| |
| 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 |