Add a simple program to pad to a given size.

1 files changed, 86 insertions, 0 deletions

diff --git a/utils/padff.c b/utils/padff.c
new file mode 100644
index 0000000..c666882
--- /dev/null
+++ b/utils/padff.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2014 IIMarckus <imarckus@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void
+putuint32BE(uint32_t n, FILE *f)
+{
+	fputc(n >> 24, f);
+	fputc(n >> 16, f);
+	fputc(n >> 8, f);
+	fputc(n, f);
+}
+
+int
+main(int argc, char *argv[])
+{
+	bool efflag, sameptrflag;
+	int i, runsum, numptrs;
+	long size, cursize;
+	uint32_t *ptrs, *runsums;
+	FILE *f;
+	uint8_t buf[8192];
+	char *ep;
+
+	if (argc != 3) {
+		errx(1, "Usage: padff size file");
+	}
+
+	size = strtol(argv[1], &ep, 0);
+	if (argv[1][0] == '\0' || *ep != '\0') {
+		errx(1, "invalid size '%s'", argv[1]);
+	}
+	if (errno == ERANGE && (size == LONG_MAX || size == LONG_MIN)) {
+		errx(1, "invalid size '%s'", argv[1]);
+	}
+
+	f = fopen(argv[2], "rb");
+	if (f == NULL) {
+		err(1, "Could not open file '%s'", argv[2]);
+	}
+
+	fseek(f, 0, SEEK_END);
+	cursize = ftell(f);
+
+	if (cursize > size) {
+		errx(1, "size %d is smaller than current filesize", size);
+	}
+
+	fseek(f, 0, SEEK_SET);
+	for (i = 0; i < cursize; ++i) {
+		fputc(fgetc(f), stdout);
+	}
+	int padspace;
+	padspace = size - ftell(stdout);
+	for (i = 0; i < sizeof buf; ++i) {
+		buf[i] = 0xff;
+	}
+	while (padspace > sizeof buf) {
+		fwrite(buf, sizeof *buf, sizeof buf, stdout);
+		padspace -= sizeof buf;
+	}
+	fwrite(buf, sizeof *buf, padspace, stdout);
+
+	return 0;
+}