FreeCalypso > hg > freecalypso-sw
view stashaway/mkcrc32tab.c @ 825:f8eaff87563f
gsm-fw: replaced strtok() from newlib with 4.3BSD-Tahoe version
newlib version uses malloc which is not allowed
author | Space Falcon <falcon@ivan.Harhan.ORG> |
---|---|
date | Mon, 06 Apr 2015 00:24:07 +0000 |
parents | 8fbd52a639a5 |
children |
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/* * This program generates the CRC-32 table for the LSB-first direction. * Derived from the MSB-first version written years earlier by the * same author (Michael Spacefalcon) for SDSL/ATM AAL5. */ #include <sys/types.h> #include <stdio.h> u_long table[256]; main(argc, argv) char **argv; { build_table(); emit_table(); exit(0); } u_long crc_byte(crc, inb) u_long crc; int inb; { register int bit; crc ^= inb & 0xFF; for (bit = 0; bit < 8; bit++) { if (crc & 1) crc = (crc >> 1) ^ 0xEDB88320; else crc >>= 1; } return(crc); } build_table() { int i; for (i = 0; i < 256; i++) table[i] = crc_byte(0, i); } emit_table() { int i, j, idx; printf("unsigned long crc32_table[256] = {\n"); for (i = 0, idx = 0; i < 64; i++) { putchar('\t'); for (j = 0; j < 4; j++, idx++) printf("0x%08X,%c", table[idx], j==3 ? '\n' : ' '); } printf("};\n"); }