89 lines
2.8 KiB
C++
89 lines
2.8 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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#include "nsString.h"
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#include "mozilla/uniffi/OwnedRustBuffer.h"
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namespace mozilla::uniffi {
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using dom::ArrayBuffer;
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OwnedRustBuffer::OwnedRustBuffer(const RustBuffer& aBuf) : mBuf(aBuf) {}
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OwnedRustBuffer OwnedRustBuffer::FromArrayBuffer(
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const ArrayBuffer& aArrayBuffer) {
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return aArrayBuffer.ProcessData(
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[](const Span<uint8_t>& aData,
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JS::AutoCheckCannotGC&&) -> OwnedRustBuffer {
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uint64_t bufLen = aData.Length();
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RustCallStatus status{};
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RustBuffer buf =
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uniffi_rustbuffer_alloc(static_cast<uint64_t>(bufLen), &status);
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buf.len = bufLen;
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// uniffi_rustbuffer_alloc cannot fail within gecko as we build with
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// `panic=abort`, and allocations default to infallible.
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MOZ_RELEASE_ASSERT(status.code == 0,
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"uniffi_rustbuffer_alloc cannot fail in Gecko");
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memcpy(buf.data, aData.Elements(), bufLen);
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return OwnedRustBuffer(buf);
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});
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}
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OwnedRustBuffer::OwnedRustBuffer(OwnedRustBuffer&& aOther) : mBuf(aOther.mBuf) {
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aOther.mBuf = RustBuffer{0};
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}
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OwnedRustBuffer& OwnedRustBuffer::operator=(OwnedRustBuffer&& aOther) {
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if (&aOther != this) {
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FreeData();
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}
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mBuf = aOther.mBuf;
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aOther.mBuf = RustBuffer{0};
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return *this;
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}
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void OwnedRustBuffer::FreeData() {
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if (IsValid()) {
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RustCallStatus status{};
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uniffi_rustbuffer_free(mBuf, &status);
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MOZ_RELEASE_ASSERT(status.code == 0,
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"Freeing a rustbuffer should never fail");
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mBuf = {0};
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}
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}
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OwnedRustBuffer::~OwnedRustBuffer() { FreeData(); }
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RustBuffer OwnedRustBuffer::IntoRustBuffer() {
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RustBuffer rv = mBuf;
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mBuf = {};
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return rv;
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}
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void OwnedRustBuffer::IntoArrayBuffer(JSContext* aCx,
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JS::MutableHandle<JSObject*> aResult,
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ErrorResult& aError) {
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auto len = mBuf.len;
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void* data = mBuf.data;
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auto userData = MakeUnique<OwnedRustBuffer>(std::move(*this));
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UniquePtr<void, JS::BufferContentsDeleter> dataPtr{
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data, {&ArrayBufferFreeFunc, userData.release()}};
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JS::Rooted<JSObject*> obj(
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aCx, JS::NewExternalArrayBuffer(aCx, len, std::move(dataPtr)));
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if (!obj) {
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aError.NoteJSContextException(aCx);
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return;
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}
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aResult.set(obj);
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}
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void OwnedRustBuffer::ArrayBufferFreeFunc(void* contents, void* userData) {
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UniquePtr<OwnedRustBuffer> buf{reinterpret_cast<OwnedRustBuffer*>(userData)};
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}
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} // namespace mozilla::uniffi
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