File: ArgumentCodersGlib.h

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/*
 *  Copyright (C) 2024 Igalia S.L.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#pragma once

#include <glib.h>
#include <optional>

#include <wtf/glib/GSpanExtras.h>
#include <wtf/glib/GUniquePtr.h>
#include <wtf/text/CString.h>

namespace IPC {

template<> struct ArgumentCoder<GUniquePtr<char*>> {
    static void encode(Encoder& encoder, const GUniquePtr<char*>& strv)
    {
        auto length = strv.get() ? g_strv_length(strv.get()) : 0;

        encoder << length;

        if (!length)
            return;

        auto strvSpan = span(strv.get());
        for (auto str : strvSpan)
            encoder << CString(str);
    }

    static std::optional<GUniquePtr<char*>> decode(Decoder& decoder)
    {
        auto length = decoder.decode<unsigned>();

        if (UNLIKELY(!length))
            return std::nullopt;

        GUniquePtr<char*>strv(g_new0(char*, *length + 1));
        auto strvSpan = unsafeMakeSpan(strv.get(), *length);

        for (auto& str : strvSpan) {
            auto strOptional = decoder.decode<CString>();
            if (UNLIKELY(!strOptional))
                return std::nullopt;
            str = g_strdup(strOptional->data());
        }

        return strv;
    }
};

} // namespace IPC