1 files changed, 76 insertions, 0 deletions
diff --git a/extras/volume_id/lib/linux_swap.c b/extras/volume_id/lib/linux_swap.c
new file mode 100644
index 0000000000..0193648c9e
--- /dev/null
+++ b/extras/volume_id/lib/linux_swap.c
@@ -0,0 +1,76 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	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 version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "libvolume_id.h"
+#include "util.h"
+
+struct swap_header_v1_2 {
+	uint8_t		bootbits[1024];
+	uint32_t	version;
+	uint32_t	last_page;
+	uint32_t	nr_badpages;
+	uint8_t		uuid[16];
+	uint8_t		volume_name[16];
+} PACKED *sw;
+
+#define LARGEST_PAGESIZE			0x4000
+
+int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off)
+{
+	const uint8_t *buf;
+	unsigned int page;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	/* the swap signature is at the end of the PAGE_SIZE */
+	for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
+			buf = volume_id_get_buffer(id, off + page-10, 10);
+			if (buf == NULL)
+				return -1;
+
+			if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
+				strcpy(id->type_version, "1");
+				goto found;
+			}
+
+			if (memcmp(buf, "SWAPSPACE2", 10) == 0) {
+				sw = (struct swap_header_v1_2 *) volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
+				if (sw == NULL)
+					return -1;
+				strcpy(id->type_version, "2");
+				volume_id_set_label_raw(id, sw->volume_name, 16);
+				volume_id_set_label_string(id, sw->volume_name, 16);
+				volume_id_set_uuid(id, sw->uuid, UUID_DCE);
+				goto found;
+			}
+	}
+	return -1;
+
+found:
+	volume_id_set_usage(id, VOLUME_ID_OTHER);
+	id->type = "swap";
+
+	return 0;
+}