73 lines
2.1 KiB
C++
73 lines
2.1 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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#ifndef BUTIL_FILES_MEMORY_MAPPED_FILE_H_
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#define BUTIL_FILES_MEMORY_MAPPED_FILE_H_
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#include "butil/base_export.h"
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#include "butil/basictypes.h"
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#include "butil/files/file.h"
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#include "butil/build_config.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#endif
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namespace butil {
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class FilePath;
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class BUTIL_EXPORT MemoryMappedFile {
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public:
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// The default constructor sets all members to invalid/null values.
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MemoryMappedFile();
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~MemoryMappedFile();
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// Opens an existing file and maps it into memory. Access is restricted to
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// read only. If this object already points to a valid memory mapped file
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// then this method will fail and return false. If it cannot open the file,
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// the file does not exist, or the memory mapping fails, it will return false.
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// Later we may want to allow the user to specify access.
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bool Initialize(const FilePath& file_name);
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// As above, but works with an already-opened file. MemoryMappedFile takes
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// ownership of |file| and closes it when done.
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bool Initialize(File file);
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#if defined(OS_WIN)
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// Opens an existing file and maps it as an image section. Please refer to
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// the Initialize function above for additional information.
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bool InitializeAsImageSection(const FilePath& file_name);
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#endif // OS_WIN
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const uint8_t* data() const { return data_; }
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size_t length() const { return length_; }
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// Is file_ a valid file handle that points to an open, memory mapped file?
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bool IsValid() const;
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private:
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// Map the file to memory, set data_ to that memory address. Return true on
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// success, false on any kind of failure. This is a helper for Initialize().
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bool MapFileToMemory();
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// Closes all open handles.
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void CloseHandles();
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File file_;
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uint8_t* data_;
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size_t length_;
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#if defined(OS_WIN)
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win::ScopedHandle file_mapping_;
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bool image_; // Map as an image.
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#endif
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DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile);
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};
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} // namespace butil
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#endif // BUTIL_FILES_MEMORY_MAPPED_FILE_H_
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