mirror of
https://github.com/RGBCube/serenity
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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
/*
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* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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namespace PDF {
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class Reference {
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// We store refs as u32, with 18 bits for the index and 14 bits for the
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// generation index. The generation index is stored in the higher bits.
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// This may need to be rethought later, as the max generation index is
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// 2^16 and the max for the object index is probably 2^32 (I don't know
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// exactly)
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static constexpr auto MAX_REF_INDEX = (1 << 19) - 1; // 2 ^ 19 - 1
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static constexpr auto MAX_REF_GENERATION_INDEX = (1 << 15) - 1; // 2 ^ 15 - 1
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public:
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Reference(u32 index, u32 generation_index)
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{
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VERIFY(index < MAX_REF_INDEX);
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VERIFY(generation_index < MAX_REF_GENERATION_INDEX);
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m_combined = (generation_index << 14) | index;
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}
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[[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
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{
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return m_combined & 0x3ffff;
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}
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[[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
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{
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return m_combined >> 18;
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}
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private:
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u32 m_combined;
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};
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}
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