69 lines
1.6 KiB
C++
69 lines
1.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef loader_AutoMemMap_h
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#define loader_AutoMemMap_h
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#include "mozilla/FileUtils.h"
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#include "mozilla/MemoryMappedFile.h"
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#include "mozilla/RangedPtr.h"
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#include "mozilla/Result.h"
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#include <prio.h>
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class nsIFile;
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namespace mozilla {
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namespace ipc {
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class FileDescriptor;
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}
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namespace loader {
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class AutoMemMap {
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typedef mozilla::ipc::FileDescriptor FileDescriptor;
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public:
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AutoMemMap() = default;
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~AutoMemMap() { reset(); }
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AutoMemMap(const AutoMemMap&) = delete;
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void operator=(const AutoMemMap&) = delete;
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Result<Ok, nsresult> init(nsIFile* aFile);
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Result<Ok, nsresult> init(const FileDescriptor& aFile);
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void reset();
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bool initialized() const { return mFile.IsValid(); }
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uint32_t size() const { return mFile.Size(); }
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template <typename T = void>
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RangedPtr<const T> get() const {
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MOZ_ASSERT(mFile.IsValid());
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return {static_cast<const T*>(mFile.Data()), mFile.Size()};
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}
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size_t nonHeapSizeOfExcludingThis() { return mFile.Size(); }
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FileDescriptor cloneFileDescriptor() const;
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FileDescriptor cloneHandle() const;
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// Makes this mapping persistent. After calling this, the mapped memory
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// will remained mapped, even after this instance is destroyed.
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void setPersistent() { mPersistent = true; }
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private:
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AutoFDClose mFD;
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MemoryMappedFile mFile;
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bool mPersistent = false;
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};
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} // namespace loader
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} // namespace mozilla
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#endif // loader_AutoMemMap_h
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