mirror of https://github.com/t1meshift/os_labs.git
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "crc8.h"
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#define USAGE_STRING "Usage: %s <input_file> <output_file>\n"
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#define STR_EQ(a, b) (!strcmp((a),(b)))
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#define FATAL(fmt, ...) do {\
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fprintf(stderr,fmt,##__VA_ARGS__);\
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exit(1);\
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} while (0)
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#define WARNING(fmt, ...) fprintf(stderr,fmt,##__VA_ARGS__)
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int main(int argc, char *argv[]) {
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if (argc != 3) {
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FATAL(USAGE_STRING, argv[0]);
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}
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FILE *f = fopen(argv[1], "rb");
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if (f == NULL) {
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perror("fopen()");
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FATAL("Could not open %s\n", argv[1]);
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}
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FILE *fw = fopen(argv[2], "wb");
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if (fw == NULL) {
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perror("fopen()");
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FATAL("Could not open %s\n", argv[2]);
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}
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int rsize = 0;
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uint8_t buf[4096] = {0};
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uint8_t s;
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while ((rsize = fread(buf, 1, 4096, f)) == 4096) {
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s = 0;
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for (int i = 0; i < 4096; ++i) {
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CRC8_MAXIM_ITER(s, buf[i]);
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}
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fwrite(&s, 1, 1, fw);
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}
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if (rsize > 0) {
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s = 0;
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for (int i = 0; i < rsize; ++i) {
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CRC8_MAXIM_ITER(s, buf[i]);
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}
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fwrite(&s, 1, 1, fw);
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}
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fclose(f);
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fclose(fw);
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} |