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// Copyright (c) 2011 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);
}
} // namespace disk_cache
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