Source/WebCore/bindings/js/ReadableStreamDefaultController.cpp

/*
 * Copyright (C) 2016 Canon Inc.
 * Copyright (C) 2016-2021 Apple Inc. All rights reserved.
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 * modification, are permitted, provided that the following conditions
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 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in the
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#include "config.h"
#include "ReadableStreamDefaultController.h"

#include "WebCoreJSClientData.h"
#include <JavaScriptCore/CatchScope.h>
#include <JavaScriptCore/HeapInlines.h>
#include <JavaScriptCore/IdentifierInlines.h>
#include <JavaScriptCore/JSObjectInlines.h>

namespace WebCore {

static bool invokeReadableStreamDefaultControllerFunction(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier, const JSC::MarkedArgumentBuffer& arguments)
{
    JSC::VM& vm = lexicalGlobalObject.vm();
    JSC::JSLockHolder lock(vm);

    auto scope = DECLARE_CATCH_SCOPE(vm);
    auto function = lexicalGlobalObject.get(&lexicalGlobalObject, identifier);

    EXCEPTION_ASSERT(!scope.exception() || vm.hasPendingTerminationException());
    RETURN_IF_EXCEPTION(scope, false);

    ASSERT(function.isCallable());

    auto callData = JSC::getCallData(function);
    call(&lexicalGlobalObject, function, callData, JSC::jsUndefined(), arguments);
    EXCEPTION_ASSERT(!scope.exception() || vm.hasPendingTerminationException());
    return !scope.exception();
}

void ReadableStreamDefaultController::close()
{
    JSC::MarkedArgumentBuffer arguments;
    arguments.append(&jsController());

    auto* clientData = static_cast<JSVMClientData*>(globalObject().vm().clientData);
    auto& privateName = clientData->builtinFunctions().readableStreamInternalsBuiltins().readableStreamDefaultControllerClosePrivateName();

    invokeReadableStreamDefaultControllerFunction(globalObject(), privateName, arguments);
}


void ReadableStreamDefaultController::error(const Exception& exception)
{
    JSC::JSGlobalObject& lexicalGlobalObject = this->globalObject();
    auto& vm = lexicalGlobalObject.vm();
    JSC::JSLockHolder lock(vm);
    auto scope = DECLARE_CATCH_SCOPE(vm);
    auto value = createDOMException(&lexicalGlobalObject, exception.code(), exception.message());

    if (UNLIKELY(scope.exception())) {
        ASSERT(vm.hasPendingTerminationException());
        return;
    }

    JSC::MarkedArgumentBuffer arguments;
    arguments.append(&jsController());
    arguments.append(value);

    auto* clientData = static_cast<JSVMClientData*>(vm.clientData);
    auto& privateName = clientData->builtinFunctions().readableStreamInternalsBuiltins().readableStreamDefaultControllerErrorPrivateName();

    invokeReadableStreamDefaultControllerFunction(globalObject(), privateName, arguments);
}

bool ReadableStreamDefaultController::enqueue(JSC::JSValue value)
{
    JSC::JSGlobalObject& lexicalGlobalObject = this->globalObject();
    auto& vm = lexicalGlobalObject.vm();
    JSC::JSLockHolder lock(vm);

    JSC::MarkedArgumentBuffer arguments;
    arguments.append(&jsController());
    arguments.append(value);

    auto* clientData = static_cast<JSVMClientData*>(lexicalGlobalObject.vm().clientData);
    auto& privateName = clientData->builtinFunctions().readableStreamInternalsBuiltins().readableStreamDefaultControllerEnqueuePrivateName();

    return invokeReadableStreamDefaultControllerFunction(globalObject(), privateName, arguments);
}

bool ReadableStreamDefaultController::enqueue(RefPtr<JSC::ArrayBuffer>&& buffer)
{
    if (!buffer) {
        error(Exception { OutOfMemoryError });
        return false;
    }

    JSC::JSGlobalObject& lexicalGlobalObject = this->globalObject();
    auto& vm = lexicalGlobalObject.vm();
    JSC::JSLockHolder lock(vm);
    auto scope = DECLARE_CATCH_SCOPE(vm);
    auto length = buffer->byteLength();
    auto chunk = JSC::Uint8Array::create(WTFMove(buffer), 0, length);
    auto value = toJS(&lexicalGlobalObject, &lexicalGlobalObject, chunk.get());

    EXCEPTION_ASSERT(!scope.exception() || vm.hasPendingTerminationException());
    RETURN_IF_EXCEPTION(scope, false);

    return enqueue(value);
}

} // namespace WebCore