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192221af22
1. I'm not convinced our fletcher16 implementation is proper 2. It is not in coreutils So we add some basic code to do that. This is also the first dev-util, so add some documentation to DEVEL.md.
40 lines
840 B
C
40 lines
840 B
C
/*
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* SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#define BUF_SIZE 1024
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// CONSTANT BUF_SIZE 1024
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#define PATH_MAX 512
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// CONSTANT PATH_MAX 512
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int fletch16(FILE* fp)
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{
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long sum1 = 0;
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long sum2 = 0;
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int index;
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int c = fgetc(fp);
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while(c != EOF)
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{
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sum1 = (sum1 + c) % 255;
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sum2 = (sum2 + sum1) % 255;
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c = fgetc(fp);
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}
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return (sum2 << 8) | sum1;
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}
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int main(int argc, char** argv)
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{
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/* Open the file containing the checksums */
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FILE* fp = fopen(argv[1], "r");
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require(fp != NULL, prepend_string(
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prepend_string("Error opening checksum file ", argv[1]), "\n"));
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int csum = fletch16(fp);
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file_print(prepend_string(prepend_string(prepend_string(
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numerate_number(csum), " "), argv[1]), "\n"), stdout);
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}
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