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Add fletcher16-gen developer util

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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.
This commit is contained in:
fosslinux 2021-02-12 18:20:18 +11:00
parent 71505bc8b9
commit 192221af22
10 changed files with 400 additions and 0 deletions
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40
dev-utils/fletcher16-gen/fletcher16-gen.c Normal file
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/*
* SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdlib.h>
#include <stdio.h>
#define BUF_SIZE 1024
// CONSTANT BUF_SIZE 1024
#define PATH_MAX 512
// CONSTANT PATH_MAX 512
int fletch16(FILE* fp)
{
long sum1 = 0;
long sum2 = 0;
int index;
int c = fgetc(fp);
while(c != EOF)
{
sum1 = (sum1 + c) % 255;
sum2 = (sum2 + sum1) % 255;
c = fgetc(fp);
}
return (sum2 << 8) | sum1;
}
int main(int argc, char** argv)
{
/* Open the file containing the checksums */
FILE* fp = fopen(argv[1], "r");
require(fp != NULL, prepend_string(
prepend_string("Error opening checksum file ", argv[1]), "\n"));
int csum = fletch16(fp);
file_print(prepend_string(prepend_string(prepend_string(
numerate_number(csum), " "), argv[1]), "\n"), stdout);
}