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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
* Copyright (c) 2012 Daisuke Okanohara
*
* 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.
*
* 3. Neither the name of the authors nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*/
#ifndef RSDIC_UTIL_HPP_
#define RSDIC_UTIL_HPP_
#include <vector>
#include <stdint.h>
#include "Const.hpp"
namespace rsdic{
class Util{
public:
static uint64_t GetSlice(const std::vector<uint64_t>& bits,
uint64_t pos, uint64_t len) {
if (len == 0) return 0;
uint64_t block = pos / kSmallBlockSize;
uint64_t offset = pos % kSmallBlockSize;
uint64_t ret = bits[block] >> offset;
if (offset + len > kSmallBlockSize){
ret |= (bits[block+1] << (kSmallBlockSize - offset));
}
if (len == 64) return ret;
return ret & ((1LLU << len) - 1);
}
static void SetSlice(std::vector<uint64_t>& bits,
uint64_t pos, uint64_t len, uint64_t val) {
if (len == 0) return;
uint64_t block = pos / kSmallBlockSize;
uint64_t offset = pos % kSmallBlockSize;
bits[block] |= val << offset;
if (offset + len > kSmallBlockSize){
bits[block+1] |= val >> (kSmallBlockSize - offset);
}
}
static uint64_t Floor(uint64_t num, uint64_t div){
return (num + div - 1) / div;
}
static uint64_t GetNum(bool bit, uint64_t num, uint64_t total) {
if (bit) return num;
else return total - num;
}
};
}
#endif // RSDIC_UTIL_HPP_
|
