blob: d1765cc3ecc839ceae13286edc946b6ad7faedfa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/*
* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
namespace PDF {
class Reference {
// We store refs as u32, with 18 bits for the index and 14 bits for the
// generation index. The generation index is stored in the higher bits.
// This may need to be rethought later, as the max generation index is
// 2^16 and the max for the object index is probably 2^32 (I don't know
// exactly)
static constexpr auto MAX_REF_INDEX = (1 << 19) - 1; // 2 ^ 19 - 1
static constexpr auto MAX_REF_GENERATION_INDEX = (1 << 15) - 1; // 2 ^ 15 - 1
public:
Reference(u32 index, u32 generation_index)
{
VERIFY(index < MAX_REF_INDEX);
VERIFY(generation_index < MAX_REF_GENERATION_INDEX);
m_combined = (generation_index << 14) | index;
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
{
return m_combined & 0x3ffff;
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
{
return m_combined >> 18;
}
private:
u32 m_combined;
};
}
|
