50 lines
2.5 KiB
C
50 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.h"
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#include "libc/nexgen32e/crc32.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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/**
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* @fileoverview CRC Lookup Table Generator
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* @see http://reveng.sourceforge.net/crc-catalogue/17plus.htm
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*/
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s POLYNOMIAL\n", argv[0]);
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exit(1);
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}
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static uint32_t tab[256];
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crc32init(tab, strtoimax(argv[1], NULL, 0));
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for (unsigned i = 0; i < ARRAYLEN(tab); ++i) {
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if (i > 0) {
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printf(",");
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if (i % 6 == 0) {
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printf("\n");
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}
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}
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printf("0x%08x", tab[i]);
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}
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printf("\n");
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return 0;
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}
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