From 466fcd268e53743ca7414f1fe969a74cd0ac1ee1 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 12 Mar 2021 08:10:42 +0200
Subject: drop old crap

---
 corrupt.c | 177 --------------------------------------------------------------
 1 file changed, 177 deletions(-)
 delete mode 100644 corrupt.c

(limited to 'corrupt.c')

diff --git a/corrupt.c b/corrupt.c
deleted file mode 100644
index 0d29453..0000000
--- a/corrupt.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/*
- * Copyright (C) 2009  Lars Wirzenius
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-
-#define _LARGEFILE64_SOURCE
-#define _GNU_SOURCE
-
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <getopt.h>
-
-
-/* Number of bits to corrupt. */
-static int num_bits = 1;
-
-
-/* Choose a random integer in [0..n-1]. */
-static long choose(long n)
-{
-    if (n == 0)
-        return 0;
-    
-    long buckets = (RAND_MAX + 1L) / n;
-    long max = buckets * n;
-    long r;
-    
-    do {
-        r = random();
-    } while (r >= max);
-    return r / buckets;
-}
-
-
-static int seek(const char *filename, int fd, off_t offset)
-{
-    if (lseek(fd, offset, SEEK_SET) == (off_t) -1) {
-        fprintf(stderr, "Can't seek in %s: %s", filename, strerror(errno));
-        return -1;
-    }
-    return 0;
-}
-
-
-static int corrupt_one_bit(const char *filename, int fd, struct stat st)
-{
-    long offset;
-    long bit;
-    unsigned char byte;
-
-    offset = choose(st.st_size);
-    bit = choose(CHAR_BIT);
-    
-    if (seek(filename, fd, offset) == -1)
-        return -1;
-    if (read(fd, &byte, 1) == -1) {
-        fprintf(stderr, "Can't read %s: %s", filename, strerror(errno));
-        return -1;
-    }
-    
-    /* This is where we toggle the bit. */
-    unsigned mask = 1 << bit; // All zeroes, except for the interesting bit.
-    unsigned interesting = byte & mask; // Only the interesting bit can be 1.
-    unsigned toggled = interesting ^ mask; // Interesting bit has been toggled.
-    unsigned others = byte & (~mask); // Interesting bit is 0.
-    byte = others | toggled;
-    
-    /* Now write it back. */
-    if (seek(filename, fd, offset) == -1)
-        return -1;
-    if (write(fd, &byte, 1) != 1) {
-        fprintf(stderr, "Can't write %s: %s", filename, strerror(errno));
-        return -1;
-    }
-    
-    return 0;
-}
-
-
-static int corrupt(const char *filename)
-{
-    int fd;
-    struct stat st;
-    
-    fd = open(filename, O_RDWR | O_LARGEFILE);
-    if (fd == -1) {
-        fprintf(stderr, "Can't open %s: %s\n", filename, strerror(errno));
-        return -1;
-    }
-
-    if (fstat(fd, &st) == -1) {
-        fprintf(stderr, "Can't find length of %s: %s", filename, 
-                strerror(errno));
-        return -1;
-    }
-
-    for (int i = 0; i < num_bits; ++i)
-        if (corrupt_one_bit(filename, fd, st) == -1)
-            return -1;
-
-    if (close(fd) == -1) {
-        fprintf(stderr, "Can't close %s: %s", filename, strerror(errno));
-        return -1;
-    }
-    
-    return 0;
-}
-
-
-static int parse_args(int argc, char **argv)
-{
-    const char optstring[] = "n:";
-    const struct option longopts[] = {
-        { "bits", required_argument, NULL, 'n' },
-        { 0 },
-    };
-    char *endptr;
-    
-    for (;;) {
-        int opt = getopt_long(argc, argv, optstring, longopts, NULL);
-        switch (opt) {
-        case -1:
-            return optind;
-
-        case 'n':
-            num_bits = strtol(optarg, &endptr, 10);
-            if (*endptr != '\0') {
-                fprintf(stderr, "Invalid number of bits: %s\n", optarg);
-                exit(1);
-            }
-            break;
-            
-        default:
-        case '?':
-            exit(1);
-        }
-    }
-}
-
-
-int main(int argc, char **argv)
-{
-    int exit_code;
-    int i;
-
-    i = parse_args(argc, argv);
-    if (i == -1)
-        return 1;
-
-    srandom(time(NULL) + getpid());
-    exit_code = 0;
-    for (; i < argc; ++i)
-        if (corrupt(argv[i]) == -1)
-            exit_code = 1;
-    return exit_code;
-}
-- 
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