88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/files/memory_mapped_file.h"
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "base/metrics/histogram.h"
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#include "base/strings/string16.h"
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#include "base/threading/thread_restrictions.h"
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namespace base {
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MemoryMappedFile::MemoryMappedFile()
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: file_(INVALID_HANDLE_VALUE),
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file_mapping_(INVALID_HANDLE_VALUE),
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data_(NULL),
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length_(INVALID_FILE_SIZE) {
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}
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bool MemoryMappedFile::InitializeAsImageSection(const FilePath& file_name) {
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if (IsValid())
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return false;
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file_ = CreatePlatformFile(file_name, PLATFORM_FILE_OPEN | PLATFORM_FILE_READ,
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NULL, NULL);
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if (file_ == kInvalidPlatformFileValue) {
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DLOG(ERROR) << "Couldn't open " << file_name.AsUTF8Unsafe();
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return false;
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}
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if (!MapFileToMemoryInternalEx(SEC_IMAGE)) {
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CloseHandles();
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return false;
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}
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return true;
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}
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bool MemoryMappedFile::MapFileToMemoryInternal() {
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return MapFileToMemoryInternalEx(0);
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}
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bool MemoryMappedFile::MapFileToMemoryInternalEx(int flags) {
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ThreadRestrictions::AssertIOAllowed();
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if (file_ == INVALID_HANDLE_VALUE)
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return false;
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length_ = ::GetFileSize(file_, NULL);
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if (length_ == INVALID_FILE_SIZE)
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return false;
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file_mapping_ = ::CreateFileMapping(file_, NULL, PAGE_READONLY | flags,
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0, 0, NULL);
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if (!file_mapping_) {
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// According to msdn, system error codes are only reserved up to 15999.
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// http://msdn.microsoft.com/en-us/library/ms681381(v=VS.85).aspx.
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UMA_HISTOGRAM_ENUMERATION("MemoryMappedFile.CreateFileMapping",
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logging::GetLastSystemErrorCode(), 16000);
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return false;
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}
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data_ = static_cast<uint8*>(
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::MapViewOfFile(file_mapping_, FILE_MAP_READ, 0, 0, 0));
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if (!data_) {
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UMA_HISTOGRAM_ENUMERATION("MemoryMappedFile.MapViewOfFile",
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logging::GetLastSystemErrorCode(), 16000);
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}
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return data_ != NULL;
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}
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void MemoryMappedFile::CloseHandles() {
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if (data_)
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::UnmapViewOfFile(data_);
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if (file_mapping_ != INVALID_HANDLE_VALUE)
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::CloseHandle(file_mapping_);
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if (file_ != INVALID_HANDLE_VALUE)
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::CloseHandle(file_);
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data_ = NULL;
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file_mapping_ = file_ = INVALID_HANDLE_VALUE;
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length_ = INVALID_FILE_SIZE;
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}
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} // namespace base
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