зеркало из https://github.com/mozilla/gecko-dev.git
70 строки
2.5 KiB
C++
70 строки
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* 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 mozilla_OwnedRustBuffer_h
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#define mozilla_OwnedRustBuffer_h
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ResultVariant.h"
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#include "mozilla/dom/TypedArray.h"
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#include "mozilla/dom/UniFFIRust.h"
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namespace mozilla::uniffi {
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// RustBuffer that's owned by the JS code and handles the memory management
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class OwnedRustBuffer final {
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private:
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RustBuffer mBuf;
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void FreeData();
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public:
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// The default constructor creates an invalid OwnedRustBuffer
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OwnedRustBuffer() : mBuf{0} {};
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// Constructor for creating an OwnedRustBuffer from a raw RustBuffer struct
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// that was returned by Rust (therefore we now own the RustBuffer).
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explicit OwnedRustBuffer(const RustBuffer& aBuf);
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// Manual implementation of move constructor and assignment operator.
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OwnedRustBuffer(OwnedRustBuffer&& aOther);
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OwnedRustBuffer& operator=(OwnedRustBuffer&& aOther);
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// Delete copy & move constructor as this type is non-copyable.
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OwnedRustBuffer(const OwnedRustBuffer&) = delete;
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OwnedRustBuffer& operator=(const OwnedRustBuffer&) = delete;
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// Destructor that frees the RustBuffer if it is still valid
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~OwnedRustBuffer();
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// Constructor for creating an OwnedRustBuffer from an ArrayBuffer. Will set
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// aError to failed and construct an invalid OwnedRustBuffer if the
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// conversion failed.
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static Result<OwnedRustBuffer, nsCString> FromArrayBuffer(
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const mozilla::dom::ArrayBuffer& aArrayBuffer);
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// Moves the buffer out of this `OwnedArrayBuffer` into a raw `RustBuffer`
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// struct. The raw struct must be passed into a Rust function, transfering
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// ownership to Rust. After this call the buffer will no longer be valid.
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RustBuffer IntoRustBuffer();
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// Moves the buffer out of this `OwnedArrayBuffer` into a JS ArrayBuffer.
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// This transfers ownership into the JS engine. After this call the buffer
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// will no longer be valid.
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JSObject* IntoArrayBuffer(JSContext* cx);
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// Is this RustBuffer pointing to valid data?
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bool IsValid() const { return mBuf.data != nullptr; }
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private:
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// Helper function used by IntoArrayBuffer.
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static void ArrayBufferFreeFunc(void* contents, void* userData);
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};
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} // namespace mozilla::uniffi
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#endif // mozilla_OwnedRustBuffer_h
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