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John Wangd8702f62019-10-31 10:06:35 +08001#include "utils.h"
2
John Wang72136232019-11-14 15:33:42 +08003#include <stdio.h>
4
John Wangd8702f62019-10-31 10:06:35 +08005/** CRC32 code derived from work by Gary S. Brown.
6 * http://web.mit.edu/freebsd/head/sys/libkern/crc32.c
7 *
8 * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
9 * code or tables extracted from it, as desired without restriction.
10 *
11 */
12static uint32_t crc32_tab[] = {
13 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
14 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
15 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
16 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
17 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
18 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
19 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
20 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
21 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
22 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
23 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
24 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
25 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
26 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
27 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
28 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
29 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
30 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
31 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
32 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
33 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
34 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
35 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
36 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
37 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
38 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
39 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
40 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
41 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
42 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
43 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
44 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
45 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
46 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
47 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
48 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
49 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
50 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
51 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
52 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
53 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
54 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
55 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};
56
57uint32_t crc32(const void *data, size_t size)
58{
59 const uint8_t *p = data;
60 uint32_t crc = ~0U;
61 while (size--)
62 crc = crc32_tab[(crc ^ *p++) & 0xff] ^ (crc >> 8);
63 return crc ^ ~0U;
John Wang72136232019-11-14 15:33:42 +080064}
65
66static int print_version_field(uint8_t bcd, char *buffer, size_t buffer_size)
67{
68 int v;
69 if (bcd == 0xff)
70 return 0;
71 if ((bcd & 0xf0) == 0xf0) {
72 v = bcd & 0x0f;
73 return snprintf(buffer, buffer_size, "%d", v);
74 }
75 v = ((bcd >> 4) * 10) + (bcd & 0x0f);
76 return snprintf(buffer, buffer_size, "%02d", v);
77}
78
79#define POINTER_MOVE(rc, buffer, buffer_size, original_size) \
80 do { \
81 if (rc < 0) \
82 return rc; \
83 if ((size_t)rc >= buffer_size) \
84 return original_size - 1; \
85 buffer += rc; \
86 buffer_size -= rc; \
87 } while (0)
88
89int ver2str(const ver32_t *version, char *buffer, size_t buffer_size)
90{
91 int rc;
92 size_t original_size = buffer_size;
93 rc = print_version_field(version->major, buffer, buffer_size);
94 POINTER_MOVE(rc, buffer, buffer_size, original_size);
95 rc = snprintf(buffer, buffer_size, ".");
96 POINTER_MOVE(rc, buffer, buffer_size, original_size);
97 rc = print_version_field(version->minor, buffer, buffer_size);
98 POINTER_MOVE(rc, buffer, buffer_size, original_size);
99 if (version->update != 0xff) {
100 rc = snprintf(buffer, buffer_size, ".");
101 POINTER_MOVE(rc, buffer, buffer_size, original_size);
102 rc = print_version_field(version->update, buffer, buffer_size);
103 POINTER_MOVE(rc, buffer, buffer_size, original_size);
104 }
105 if (version->alpha != 0) {
106 rc = snprintf(buffer, buffer_size, "%c", version->alpha);
107 POINTER_MOVE(rc, buffer, buffer_size, original_size);
108 }
109 return original_size - buffer_size;
John Wang5bdb30a2019-11-20 15:28:37 +0800110}
111
112uint8_t bcd2dec8(uint8_t bcd)
113{
114 uint8_t dec = (bcd >> 4) * 10 + (bcd & 0x0f);
115 return dec;
116}
117
118uint8_t dec2bcd8(uint8_t dec)
119{
120 uint8_t bcd = (dec % 10) | (dec / 10) << 4;
121 return bcd;
122}
123
124uint16_t bcd2dec16(uint16_t bcd)
125{
126 return bcd2dec8(bcd >> 8) * 100 + bcd2dec8(bcd & 0xff);
127}
128
129uint16_t dec2bcd16(uint16_t dec)
130{
131 return dec2bcd8(dec % 100) | dec2bcd8(dec / 100) << 8;
132}
133
134uint32_t bcd2dec32(uint32_t bcd)
135{
136 return bcd2dec16(bcd >> 16) * 10000 + bcd2dec16(bcd & 0xffff);
137}
138
139uint32_t dec2bcd32(uint32_t dec)
140{
141 return dec2bcd16(dec % 10000) | dec2bcd16(dec / 10000) << 16;
142}
Xiaochao Ma39ae2a92019-11-12 20:30:34 +0800143
144bool is_time_legal(uint8_t seconds, uint8_t minutes, uint8_t hours, uint8_t day,
145 uint8_t month, uint16_t year)
146{
147 if (month < 1 || month > 12) {
148 return false;
149 }
150 static const int days[13] = {0, 31, 28, 31, 30, 31, 30,
151 31, 31, 30, 31, 30, 31};
152 int rday = days[month];
153 if (month == 2 &&
154 ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))) {
155 rday += 1;
156 }
157 if (year < 1970 || day < 1 || day > rday || seconds > 59 ||
158 minutes > 59 || hours > 23) {
159 return false;
160 }
161 return true;
162}