| /* |
| * Copyright (C) 2020 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 "Decoder.h" |
| #include "Encoder.h" |
| |
| namespace WebKit { |
| |
| struct WebBackForwardListCounts { |
| uint32_t backCount { 0 }; |
| uint32_t forwardCount { 0 }; |
| |
| void encode(IPC::Encoder& encoder) const |
| { |
| encoder << backCount; |
| encoder << forwardCount; |
| } |
| |
| static std::optional<WebBackForwardListCounts> decode(IPC::Decoder& decoder) |
| { |
| std::optional<uint32_t> backCount; |
| decoder >> backCount; |
| if (!backCount) |
| return std::nullopt; |
| |
| std::optional<uint32_t> forwardCount; |
| decoder >> forwardCount; |
| if (!forwardCount) |
| return std::nullopt; |
| |
| return WebBackForwardListCounts { *backCount, *forwardCount }; |
| } |
| }; |
| |
| } // namespace WebKit |