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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsString.h"
#include "mozilla/uniffi/OwnedRustBuffer.h"
namespace mozilla::uniffi {
using dom::ArrayBuffer;
OwnedRustBuffer::OwnedRustBuffer(const RustBuffer& aBuf) : mBuf(aBuf) {}
OwnedRustBuffer OwnedRustBuffer::FromArrayBuffer(
const ArrayBuffer& aArrayBuffer) {
return aArrayBuffer.ProcessData(
[](const Span<uint8_t>& aData,
JS::AutoCheckCannotGC&&) -> OwnedRustBuffer {
uint64_t bufLen = aData.Length();
RustCallStatus status{};
RustBuffer buf =
uniffi_rustbuffer_alloc(static_cast<uint64_t>(bufLen), &status);
buf.len = bufLen;
// uniffi_rustbuffer_alloc cannot fail within gecko as we build with
// `panic=abort`, and allocations default to infallible.
MOZ_RELEASE_ASSERT(status.code == 0,
"uniffi_rustbuffer_alloc cannot fail in Gecko");
memcpy(buf.data, aData.Elements(), bufLen);
return OwnedRustBuffer(buf);
});
}
OwnedRustBuffer::OwnedRustBuffer(OwnedRustBuffer&& aOther) : mBuf(aOther.mBuf) {
aOther.mBuf = RustBuffer{0};
}
OwnedRustBuffer& OwnedRustBuffer::operator=(OwnedRustBuffer&& aOther) {
if (&aOther != this) {
FreeData();
}
mBuf = aOther.mBuf;
aOther.mBuf = RustBuffer{0};
return *this;
}
void OwnedRustBuffer::FreeData() {
if (IsValid()) {
RustCallStatus status{};
uniffi_rustbuffer_free(mBuf, &status);
MOZ_RELEASE_ASSERT(status.code == 0,
"Freeing a rustbuffer should never fail");
mBuf = {0};
}
}
OwnedRustBuffer::~OwnedRustBuffer() { FreeData(); }
RustBuffer OwnedRustBuffer::IntoRustBuffer() {
RustBuffer rv = mBuf;
mBuf = {};
return rv;
}
void OwnedRustBuffer::IntoArrayBuffer(JSContext* aCx,
JS::MutableHandle<JSObject*> aResult,
ErrorResult& aError) {
auto len = mBuf.len;
void* data = mBuf.data;
auto userData = MakeUnique<OwnedRustBuffer>(std::move(*this));
UniquePtr<void, JS::BufferContentsDeleter> dataPtr{
data, {&ArrayBufferFreeFunc, userData.release()}};
JS::Rooted<JSObject*> obj(
aCx, JS::NewExternalArrayBuffer(aCx, len, std::move(dataPtr)));
if (!obj) {
aError.NoteJSContextException(aCx);
return;
}
aResult.set(obj);
}
void OwnedRustBuffer::ArrayBufferFreeFunc(void* contents, void* userData) {
UniquePtr<OwnedRustBuffer> buf{reinterpret_cast<OwnedRustBuffer*>(userData)};
}
} // namespace mozilla::uniffi
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