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// Copyright 2013 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 "base/files/memory_mapped_file.h"
#include "base/files/file_path.h"
#include "base/strings/string16.h"
#include "base/threading/thread_restrictions.h"
namespace base {
MemoryMappedFile::MemoryMappedFile() : data_(NULL), length_(0), image_(false) {
}
bool MemoryMappedFile::InitializeAsImageSection(const FilePath& file_name) {
image_ = true;
return Initialize(file_name);
}
bool MemoryMappedFile::MapFileToMemory() {
ThreadRestrictions::AssertIOAllowed();
if (!file_.IsValid())
return false;
int64 len = file_.GetLength();
if (len <= 0 || len > kint32max)
return false;
length_ = static_cast<size_t>(len);
int flags = image_ ? SEC_IMAGE | PAGE_READONLY : PAGE_READONLY;
file_mapping_.Set(::CreateFileMapping(file_.GetPlatformFile(), NULL,
flags, 0, 0, NULL));
if (!file_mapping_.IsValid())
return false;
data_ = static_cast<uint8*>(::MapViewOfFile(file_mapping_.Get(),
FILE_MAP_READ, 0, 0, 0));
return data_ != NULL;
}
void MemoryMappedFile::CloseHandles() {
if (data_)
::UnmapViewOfFile(data_);
if (file_mapping_.IsValid())
file_mapping_.Close();
if (file_.IsValid())
file_.Close();
data_ = NULL;
length_ = 0;
}
} // namespace base
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