Belle II Software  release-05-01-25
CRCCalculator.cc
1 #include <rawdata/CRCCalculator.h>
2 #include <rawdata/switch_basf2_standalone.h>
3 #include <string>
4 using namespace std;
5 
6 
7 
8 unsigned short CalcCRC16LittleEndian(unsigned short crc16, const int buf[], int nwords)
9 {
10 
11  if (nwords < 0) {
12  char err_buf[500];
13  sprintf(err_buf, "nwords value(%d) is invalid. Cannot calculate CRC16. Exiting...\n %s %s %d\n",
14  nwords, __FILE__, __PRETTY_FUNCTION__, __LINE__);
15  printf("%s", err_buf); fflush(stdout);
16  string err_str = err_buf;
17  throw (err_str);
18  }
19 
20  const unsigned short CRC16Table0x1021[ 256 ] = {
21  0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
22  0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
23  0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
24  0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
25  0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
26  0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
27  0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
28  0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
29 
30  0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
31  0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
32  0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
33  0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
34  0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
35  0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
36  0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
37  0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
38 
39  0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
40  0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
41  0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
42  0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
43  0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
44  0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
45  0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
46  0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
47 
48  0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
49  0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
50  0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
51  0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
52  0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
53  0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
54  0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
55  0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
56  };
57 
58  int cnt = 0, nints = 0;
59  // printf("### %.8x %.4x\n", buf[ 0 ], crc16);
60  while (nwords != 0) {
61 
62  unsigned char temp_buf = *((unsigned char*)(buf + nints) + (-(cnt % 4) + 3));
63  crc16 = CRC16Table0x1021[(crc16 >> (16 - CHAR_BIT)) ^ temp_buf ] ^ (crc16 << CHAR_BIT);
64  // printf("%.2x %.4x\n", temp_buf, crc16);
65  if ((cnt % 4) == 3) {
66  nwords--;
67  nints++;
68  // printf("### %.8x\n", buf[ nints ] );
69  }
70 
71  cnt++;
72  }
73 
74 
75  return crc16;
76 
77 }
78 
79 
80 void copyData(int* buf_to, int* pos_nwords_to, const int* buf_from,
81  const int copy_nwords, const int nwords_buf_to)
82 {
83 
84  if (*pos_nwords_to + copy_nwords > nwords_buf_to) {
85  B2FATAL("Buffer overflow. Exiting...");
86  }
87 
88  memcpy(buf_to + *pos_nwords_to, buf_from, copy_nwords * sizeof(int));
89  *pos_nwords_to += copy_nwords;
90  return;
91 }
92