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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
coreutil.c
Miscellaneous utility code
***************************************************************************/
#include "coreutil.h"
#include <assert.h>
#include <zlib.h>
/***************************************************************************
BINARY CODED DECIMAL HELPERS
***************************************************************************/
int bcd_adjust(int value)
{
if ((value & 0xf) >= 0xa)
value = value + 0x10 - 0xa;
if ((value & 0xf0) >= 0xa0)
value = value - 0xa0 + 0x100;
return value;
}
uint32_t dec_2_bcd(uint32_t a)
{
uint32_t result = 0;
int shift = 0;
while (a != 0)
{
result |= (a % 10) << shift;
a /= 10;
shift += 4;
}
return result;
}
uint32_t bcd_2_dec(uint32_t a)
{
uint32_t result = 0;
uint32_t scale = 1;
while (a != 0)
{
result += (a & 0x0f) * scale;
a >>= 4;
scale *= 10;
}
return result;
}
/***************************************************************************
GREGORIAN CALENDAR HELPERS
***************************************************************************/
int gregorian_is_leap_year(int year)
{
return !((year % 100) ? (year % 4) : (year % 400));
}
/* months are one counted */
/**
* @fn int gregorian_days_in_month(int month, int year)
*
* @brief Gregorian days in month.
*
* @param month The month.
* @param year The year.
*
* @return An int.
*/
int gregorian_days_in_month(int month, int year)
{
assert(month >= 1 && month <= 12);
int days[] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
days[1] += gregorian_is_leap_year(year) ? 1 : 0;
return days[month-1];
}
/***************************************************************************
MISC
***************************************************************************/
/**
* @fn void rand_memory(void *memory, size_t length)
*
* @brief Random memory.
*
* @param [in,out] memory If non-null, the memory.
* @param length The length.
*/
void rand_memory(void *memory, size_t length)
{
static uint32_t seed = 0;
uint8_t *bytes = (uint8_t *) memory;
size_t i;
for (i = 0; i < length; i++)
{
seed = seed * 214013 + 2531011;
bytes[i] = (uint8_t) (seed >> 16);
}
}
uint32_t core_crc32(uint32_t crc, const uint8_t *buf, uint32_t len)
{
return crc32(crc, buf, len);
}
|