FreeCalypso > hg > freecalypso-sw
annotate stashaway/mkcrc32tab.c @ 435:c6e1c813e7f0
README.hosttools: updated for serterm
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sun, 22 Jun 2014 01:40:59 +0000 |
parents | 8fbd52a639a5 |
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CRC-32 table, will be used for flash dump integrity checks
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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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CRC-32 table, will be used for flash dump integrity checks
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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 } |