vasilito
cf12defd28
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
/*
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SPDX-FileCopyrightText: 2024 Andreas Hartmetz <ahartmetz@gmail.com>
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SPDX-License-Identifier: LGPL-2.0-or-later
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*/
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#pragma once
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#include <string.h>
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/**
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* KXcbEvent allocates an xcb event in a 32 bytes large, zero-initialized buffer to avoid
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* out-of-bounds reads and uninitialized memory reads in xcb_send_event(). According to
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* XCB documentation, the wire size of all XCB events is 32 bytes, and that many bytes will
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* be read by xcb_send_event().
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*/
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template<class EventType, bool needsPadding = (sizeof(EventType) < 32)>
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struct KXcbEvent;
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template<class EventType>
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class KXcbEvent<EventType, false> : public EventType
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{
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public:
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inline KXcbEvent()
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{
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static_assert(sizeof(*this) == s_evtSize);
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memset(this, 0, s_evtSize);
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}
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inline const char *buffer() const
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{
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return reinterpret_cast<const char *>(this);
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}
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private:
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static constexpr size_t s_evtSize = 32;
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};
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template<class EventType>
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class KXcbEvent<EventType, true> : public EventType
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{
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public:
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inline KXcbEvent()
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{
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static_assert(sizeof(*this) == s_evtSize);
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memset(this, 0, s_evtSize);
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}
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inline const char *buffer() const
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{
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return reinterpret_cast<const char *>(this);
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}
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private:
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static constexpr size_t s_evtSize = 32;
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char m_filler[s_evtSize - sizeof(EventType)];
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};
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