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/*
* Copyright (C) 2019-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <JavaScriptCore/ArrayBuffer.h>
#include <WebCore/Blob.h>
#include <WebCore/Document.h>
#include <WebCore/ExceptionCode.h>
#include <WebCore/FileReaderLoader.h>
#include <WebCore/FileReaderLoaderClient.h>
#include <WebCore/Logging.h>
#include <WebCore/SharedBuffer.h>
#include <wtf/CompletionHandler.h>
namespace WebCore {
class BlobLoader final : public FileReaderLoaderClient, public RefCounted<BlobLoader> {
WTF_MAKE_TZONE_ALLOCATED(BlobLoader);
public:
// CompleteCallback is always called except if BlobLoader is cancelled/deallocated.
using CompleteCallback = Function<void(BlobLoader&)>;
static Ref<BlobLoader> create(CompleteCallback&& callback) { return adoptRef(*new BlobLoader(WTFMove(callback))); }
~BlobLoader();
// FileReaderLoaderClient.
void ref() const final { RefCounted::ref(); }
void deref() const final { RefCounted::deref(); }
void start(Blob&, ScriptExecutionContext*, FileReaderLoader::ReadType);
void start(const URL&, ScriptExecutionContext*, FileReaderLoader::ReadType);
void cancel();
bool isLoading() const { return m_loader && m_completeCallback; }
String stringResult() const { return m_loader ? m_loader->stringResult() : String(); }
RefPtr<JSC::ArrayBuffer> arrayBufferResult() const { return m_loader ? m_loader->arrayBufferResult() : nullptr; }
std::optional<ExceptionCode> errorCode() const { return m_loader ? m_loader->errorCode() : std::nullopt; }
private:
explicit BlobLoader(CompleteCallback&&);
void didStartLoading() final { }
void didReceiveData() final { }
void didFinishLoading() final;
void didFail(ExceptionCode errorCode) final;
void complete();
std::unique_ptr<FileReaderLoader> m_loader;
CompleteCallback m_completeCallback;
};
inline BlobLoader::BlobLoader(CompleteCallback&& completeCallback)
: m_completeCallback(WTFMove(completeCallback))
{
}
inline BlobLoader::~BlobLoader()
{
if (isLoading())
cancel();
}
inline void BlobLoader::cancel()
{
RELEASE_LOG_INFO_IF(m_completeCallback, Loading, "Cancelling ongoing blob loader");
if (m_loader)
m_loader->cancel();
}
inline void BlobLoader::start(Blob& blob, ScriptExecutionContext* context, FileReaderLoader::ReadType readType)
{
ASSERT(!m_loader);
m_loader = makeUnique<FileReaderLoader>(readType, this);
m_loader->start(context, blob);
}
inline void BlobLoader::start(const URL& blobURL, ScriptExecutionContext* context, FileReaderLoader::ReadType readType)
{
ASSERT(!m_loader);
m_loader = makeUnique<FileReaderLoader>(readType, this);
m_loader->start(context, blobURL);
}
inline void BlobLoader::didFinishLoading()
{
std::exchange(m_completeCallback, { })(*this);
}
inline void BlobLoader::didFail(ExceptionCode)
{
std::exchange(m_completeCallback, { })(*this);
}
} // namespace WebCore
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