| /* |
| * Copyright 2012 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // This file is very similar to the posix version except this implementation |
| // doesn't use memory mapped file. |
| |
| #include "net/disk_cache/mapped_file.h" |
| |
| #include "base/file_path.h" |
| #include "base/logging.h" |
| |
| namespace disk_cache { |
| |
| void* MappedFile::Init(const FilePath& name, size_t size) { |
| DCHECK(!init_); |
| if (init_ || !File::Init(name)) |
| return NULL; |
| |
| if (!size) size = GetLength(); |
| |
| // Create buffer |
| buffer_ = new char[size]; |
| |
| if (Read(buffer_, size, 0)) { |
| // Read data into buffer |
| view_size_ = size; |
| init_ = true; |
| } else { |
| // Reset |
| view_size_ = 0; |
| delete [] static_cast<char*>(buffer_); |
| buffer_ = NULL; |
| } |
| return buffer_; |
| } |
| |
| 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() { |
| } |
| |
| MappedFile::~MappedFile() { |
| if (init_) { |
| // update file |
| Write(buffer_, view_size_, 0); |
| delete [] static_cast<char*>(buffer_); |
| buffer_ = NULL; |
| } |
| } |
| |
| } // namespace disk_cache |