1c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// Use of this source code is governed by a BSD-style license that can be 3c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// found in the LICENSE file. 4c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 5c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include "net/disk_cache/mapped_file.h" 6c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 7c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include <errno.h> 8c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include <sys/mman.h> 9c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 10c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include "base/file_path.h" 11c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include "base/logging.h" 12c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#include "net/disk_cache/disk_cache.h" 13c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 14c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottnamespace disk_cache { 15c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 16c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottvoid* MappedFile::Init(const FilePath& name, size_t size) { 17c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott DCHECK(!init_); 18c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott if (init_ || !File::Init(name)) 19c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott return NULL; 20c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 21c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott if (!size) 22c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott size = GetLength(); 23c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 24c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott buffer_ = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, 25c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott platform_file(), 0); 26c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott init_ = true; 27c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott DCHECK(reinterpret_cast<intptr_t>(buffer_) != -1); 28c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott if (reinterpret_cast<intptr_t>(buffer_) == -1) 29c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott buffer_ = 0; 30c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 31c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott view_size_ = size; 32c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott return buffer_; 33c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott} 34c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 35c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottbool MappedFile::Load(const FileBlock* block) { 36c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott size_t offset = block->offset() + view_size_; 37c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott return Read(block->buffer(), block->size(), offset); 38c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott} 39c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 40c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottbool MappedFile::Store(const FileBlock* block) { 41c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott size_t offset = block->offset() + view_size_; 42c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott return Write(block->buffer(), block->size(), offset); 43c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott} 44c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 4572a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian MonsenMappedFile::~MappedFile() { 4672a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen if (!init_) 4772a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen return; 4872a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen 4972a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen if (buffer_) { 5072a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen int ret = munmap(buffer_, view_size_); 5172a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen DCHECK(0 == ret); 5272a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen } 5372a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen} 5472a454cd3513ac24fbdd0e0cb9ad70b86a99b801Kristian Monsen 55c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott} // namespace disk_cache 56