41 lines
840 B
C
41 lines
840 B
C
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/*
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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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