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annotate stashaway/mkcrc32tab.c @ 372:47391b5c15ff

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os_mem_fl.c: os_MemoryInformation() done
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 01 Jun 2014 00:09:52 +0000
parents 8fbd52a639a5
children
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33
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1 /*
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2 * This program generates the CRC-32 table for the LSB-first direction.
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3 * Derived from the MSB-first version written years earlier by the
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4 * same author (Michael Spacefalcon) for SDSL/ATM AAL5.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <stdio.h>
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9
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10 u_long table[256];
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11
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12 main(argc, argv)
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13 char **argv;
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14 {
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15 build_table();
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16 emit_table();
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17 exit(0);
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18 }
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19
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20 u_long
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21 crc_byte(crc, inb)
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22 u_long crc;
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23 int inb;
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24 {
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25 register int bit;
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26
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27 crc ^= inb & 0xFF;
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28 for (bit = 0; bit < 8; bit++) {
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29 if (crc & 1)
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30 crc = (crc >> 1) ^ 0xEDB88320;
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31 else
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32 crc >>= 1;
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33 }
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34 return(crc);
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35 }
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36
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37 build_table()
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38 {
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39 int i;
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40
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41 for (i = 0; i < 256; i++)
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42 table[i] = crc_byte(0, i);
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43 }
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44
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45 emit_table()
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46 {
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47 int i, j, idx;
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48
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49 printf("unsigned long crc32_table[256] = {\n");
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50 for (i = 0, idx = 0; i < 64; i++) {
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51 putchar('\t');
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52 for (j = 0; j < 4; j++, idx++)
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53 printf("0x%08X,%c", table[idx], j==3 ? '\n' : ' ');
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54 }
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55 printf("};\n");
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56 }