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/*
* Copyright (C) 2022 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 "ExceptionOr.h"
#include "Formats.h"
#include <JavaScriptCore/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <zlib.h>
namespace WebCore {
class CompressionStreamEncoder : public RefCounted<CompressionStreamEncoder> {
public:
static Ref<CompressionStreamEncoder> create(unsigned char format)
{
return adoptRef(*new CompressionStreamEncoder(format));
}
ExceptionOr<RefPtr<Uint8Array>> encode(const BufferSource&& input);
ExceptionOr<RefPtr<Uint8Array>> flush();
~CompressionStreamEncoder()
{
if (m_initialized)
deflateEnd(&m_zstream);
}
private:
bool didDeflateFinish(int) const;
ExceptionOr<RefPtr<JSC::ArrayBuffer>> compress(const uint8_t* input, const size_t inputLength);
ExceptionOr<bool> initialize();
explicit CompressionStreamEncoder(unsigned char format)
: m_format(static_cast<Formats::CompressionFormat>(format))
{
std::memset(&m_zstream, 0, sizeof(m_zstream));
}
// 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_initialized { false };
bool m_didFinish { false };
z_stream m_zstream;
Formats::CompressionFormat m_format;
};
} // namespace WebCore
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