blob: 69c13a449753ced0ee367eb3ddea9989b05c090e [file] [log] [blame]
// Copyright (c) 2006-2008 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 "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;
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);
}
} // namespace disk_cache