// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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#ifndef MultipartImageResourceParser_h
#define MultipartImageResourceParser_h

#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "platform/network/ResourceResponse.h"
#include "wtf/Vector.h"

namespace blink {

// A parser parsing mlutipart/x-mixed-replace resource.
class CORE_EXPORT MultipartImageResourceParser final : public GarbageCollectedFinalized<MultipartImageResourceParser> {
    WTF_MAKE_NONCOPYABLE(MultipartImageResourceParser);
public:
    class CORE_EXPORT Client : public WillBeGarbageCollectedMixin {
    public:
        virtual ~Client() = default;
        virtual void onePartInMultipartReceived(const ResourceResponse&) = 0;
        virtual void multipartDataReceived(const char* bytes, size_t) = 0;
        DEFINE_INLINE_VIRTUAL_TRACE() {}
    };

    MultipartImageResourceParser(const ResourceResponse&, const Vector<char>& boundary, Client*);
    void appendData(const char* bytes, size_t);
    void finish();
    void cancel() { m_isCancelled = true; }

    DECLARE_TRACE();

    static size_t skippableLengthForTest(const Vector<char>& data, size_t size) { return skippableLength(data, size); }
    static size_t findBoundaryForTest(const Vector<char>& data, Vector<char>* boundary) { return findBoundary(data, boundary); }

private:
    bool parseHeaders();
    bool isCancelled() const { return m_isCancelled; }
    static size_t skippableLength(const Vector<char>&, size_t);
    // This function updates |*boundary|.
    static size_t findBoundary(const Vector<char>& data, Vector<char>* boundary);

    const ResourceResponse m_originalResponse;
    Vector<char> m_boundary;
    RawPtrWillBeMember<Client> m_client;

    Vector<char> m_data;
    bool m_isParsingTop = true;
    bool m_isParsingHeaders = false;
    bool m_sawLastBoundary = false;
    bool m_isCancelled = false;
};

} // namespace blink

#endif // MultipartImageResourceParser_h