ff-utils

commit 0699592f5cc9552e660eaf9adf46603a2bbf1629
Author: prenev <an2qzavok@gmail.com>
Date:   Sat, 20 Mar 2021 17:00:18 +0300

ff-pattern

Diffstat:
A
ff-pattern.c
 | 
47
+++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 47 insertions(+), 0 deletions(-)
diff --git a/ff-pattern.c b/ff-pattern.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+
+int fid;
+long  inx, iny, outx, outy;
+long size, i, x, y;
+uint32_t hbuf[4];
+char *buf;
+char *argv0;
+
+void
+usage(void)
+{
+	dprintf(2, "usage: %s width height\n", argv0);
+	exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+	fid = 0;
+	argv0 = argv[0];
+	if (argc < 3) usage();
+	outx = strtol(argv[1], 0, 10);
+	outy = strtol(argv[2], 0, 10);
+	
+	read(fid, hbuf, 16);
+	inx = ntohl(hbuf[2]);
+	iny = ntohl(hbuf[3]);
+	size = inx * iny * 8;
+	buf = malloc(size);
+	read(fid, buf, size);
+	hbuf[2] = htonl(outx);
+	hbuf[3] = htonl(outy);
+	write(1, hbuf, 16);
+	for (i = 0; i < outx * outy; i++){
+		x = i % outx;
+		y = i / outx;
+		int d;
+		d = x%inx + y%inx * inx;
+		assert(d*8<size);
+		write(1, buf + d * 8, 8);
+	}
+	return 0;
+}