+/*
+ * Copyright (c) 2007 Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
#include <stdio.h>
#include <stdlib.h>
-#include <time.h>
#include <inttypes.h>
+#include <errno.h>
+#include <string.h>
-int main(int argc, char** argv)
+static uint32_t state;
+static uint32_t ran(void)
{
- FILE *f= fopen(argv[1], "rb+");
- int count= atoi(argv[2]);
- int maxburst= atoi(argv[3]);
- int length;
+ return state = state * 1664525 + 1013904223;
+}
+
+int main(int argc, char **argv)
+{
+ FILE *f;
+ int count, maxburst, length;
- srand (time (0));
+ if (argc < 5) {
+ printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
+ return 1;
+ }
+
+ f = fopen(argv[1], "rb+");
+ if (!f) {
+ perror(argv[1]);
+ return 2;
+ }
+ count = atoi(argv[2]);
+ maxburst = atoi(argv[3]);
+ state = atoi(argv[4]);
fseek(f, 0, SEEK_END);
- length= ftell(f);
+ length = ftell(f);
fseek(f, 0, SEEK_SET);
- while(count--){
- int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX;
- int pos= random() * (uint64_t) length / RAND_MAX;
+ while (count--) {
+ int burst = 1 + ran() * (uint64_t) (abs(maxburst) - 1) / UINT32_MAX;
+ int pos = ran() * (uint64_t) length / UINT32_MAX;
fseek(f, pos, SEEK_SET);
- if(maxburst<0) burst= -maxburst;
+ if (maxburst < 0)
+ burst = -maxburst;
- if(pos + burst > length)
+ if (pos + burst > length)
continue;
- while(burst--){
- int val= random() * 256ULL / RAND_MAX;
+ while (burst--) {
+ int val = ran() * 256ULL / UINT32_MAX;
- if(maxburst<0) val=0;
+ if (maxburst < 0)
+ val = 0;
fwrite(&val, 1, 1, f);
}