1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "net/disk_cache/mapped_file.h" 6 7 #include "base/file_path.h" 8 #include "base/logging.h" 9 #include "net/disk_cache/disk_cache.h" 10 11 namespace disk_cache { 12 13 void* MappedFile::Init(const FilePath& name, size_t size) { 14 DCHECK(!init_); 15 if (init_ || !File::Init(name)) 16 return NULL; 17 18 buffer_ = NULL; 19 init_ = true; 20 section_ = CreateFileMapping(platform_file(), NULL, PAGE_READWRITE, 0, 21 static_cast<DWORD>(size), NULL); 22 if (!section_) 23 return NULL; 24 25 buffer_ = MapViewOfFile(section_, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, size); 26 DCHECK(buffer_); 27 view_size_ = size; 28 29 return buffer_; 30 } 31 32 MappedFile::~MappedFile() { 33 if (!init_) 34 return; 35 36 if (buffer_) { 37 BOOL ret = UnmapViewOfFile(buffer_); 38 DCHECK(ret); 39 } 40 41 if (section_) 42 CloseHandle(section_); 43 } 44 45 bool MappedFile::Load(const FileBlock* block) { 46 size_t offset = block->offset() + view_size_; 47 return Read(block->buffer(), block->size(), offset); 48 } 49 50 bool MappedFile::Store(const FileBlock* block) { 51 size_t offset = block->offset() + view_size_; 52 return Write(block->buffer(), block->size(), offset); 53 } 54 55 } // namespace disk_cache 56
