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/*
* Copyright (C) 2022-2024 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. ``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
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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 "BufferSource.h"
#include "CompressionStream.h"
#include "ExceptionOr.h"
#include "Formats.h"
#include "ZStream.h"
#include <JavaScriptCore/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class CompressionStreamEncoder : public RefCounted<CompressionStreamEncoder> {
public:
static ExceptionOr<Ref<CompressionStreamEncoder>> create(unsigned char formatChar)
{
auto format = static_cast<Formats::CompressionFormat>(formatChar);
#if !PLATFORM(COCOA)
if (format == Formats::CompressionFormat::Brotli)
return Exception { ExceptionCode::NotSupportedError, "Unsupported algorithm"_s };
#endif
return adoptRef(*new CompressionStreamEncoder(format));
}
ExceptionOr<RefPtr<Uint8Array>> encode(const BufferSource&&);
ExceptionOr<RefPtr<Uint8Array>> flush();
private:
bool didDeflateFinish(int) const;
ExceptionOr<Ref<JSC::ArrayBuffer>> compress(std::span<const uint8_t>);
ExceptionOr<Ref<JSC::ArrayBuffer>> compressZlib(std::span<const uint8_t>);
#if PLATFORM(COCOA)
bool didDeflateFinishAppleCompressionFramework(int);
ExceptionOr<Ref<JSC::ArrayBuffer>> compressAppleCompressionFramework(std::span<const uint8_t>);
#endif
explicit CompressionStreamEncoder(Formats::CompressionFormat format)
: m_format(format)
{
}
// If the user provides too small of an input size we will automatically allocate a page worth of memory instead.
// Very small input sizes can result in a larger output than their input. This would require an additional
// encode call then, which is not desired.
const size_t startingAllocationSize = 16384; // 16KB
const size_t maxAllocationSize = 1073741824; // 1GB
bool m_didFinish { false };
const Formats::CompressionFormat m_format;
// TODO: convert to using variant
CompressionStream m_compressionStream;
ZStream m_zstream;
};
} // namespace WebCore
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