1 files changed, 273 insertions, 0 deletions

diff --git a/libblkid/iso9660.c b/libblkid/iso9660.c
new file mode 100644
index 000000000..148587b3b
--- /dev/null
+++ b/libblkid/iso9660.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ *
+ * Inspired also by libvolume_id by
+ *     Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include "superblocks.h"
+
+struct iso9660_date {
+	unsigned char year[4];
+	unsigned char month[2];
+	unsigned char day[2];
+	unsigned char hour[2];
+	unsigned char minute[2];
+	unsigned char second[2];
+	unsigned char hundredth[2];
+	unsigned char offset;
+} __attribute__ ((packed));
+
+/* PVD - Primary volume descriptor */
+struct iso_volume_descriptor {
+	unsigned char	vd_type;
+	unsigned char	vd_id[5];
+	unsigned char	vd_version;
+	unsigned char	flags;
+	unsigned char	system_id[32];
+	unsigned char	volume_id[32];
+	unsigned char	unused[8];
+	unsigned char	space_size[8];
+	unsigned char	escape_sequences[8];
+	unsigned char  unused1[222];
+	unsigned char  publisher_id[128];
+	unsigned char  unused2[128];
+	unsigned char  application_id[128];
+	unsigned char  unused3[111];
+	struct iso9660_date created;
+	struct iso9660_date modified;
+} __attribute__((packed));
+
+/* Boot Record */
+struct boot_record {
+	unsigned char	vd_type;
+	unsigned char	vd_id[5];
+	unsigned char	vd_version;
+	unsigned char	boot_system_id[32];
+	unsigned char	boot_id[32];
+	unsigned char	unused[1];
+} __attribute__((packed));
+
+#define ISO_SUPERBLOCK_OFFSET		0x8000
+#define ISO_SECTOR_SIZE			0x800
+#define ISO_VD_OFFSET			(ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
+#define ISO_VD_BOOT_RECORD		0x0
+#define ISO_VD_SUPPLEMENTARY		0x2
+#define ISO_VD_END			0xff
+#define ISO_VD_MAX			16
+
+struct high_sierra_volume_descriptor {
+	unsigned char	foo[8];
+	unsigned char	type;
+	unsigned char	id[5];
+	unsigned char	version;
+	unsigned char	unused1;
+	unsigned char	system_id[32];
+	unsigned char   volume_id[32];
+} __attribute__((packed));
+
+/* returns 1 if the begin of @ascii is equal to @utf16 string.
+ */
+static int ascii_eq_utf16be(unsigned char *ascii,
+			unsigned char *utf16, size_t len)
+{
+	size_t a, u;
+
+	for (a = 0, u = 0; u < len; a++, u += 2) {
+		if (utf16[u] != 0x0 || ascii[a] != utf16[u + 1])
+			return 0;
+	}
+	return 1;
+}
+
+/* old High Sierra format */
+static int probe_iso9660_hsfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct high_sierra_volume_descriptor *iso;
+
+	iso = blkid_probe_get_sb(pr, mag, struct high_sierra_volume_descriptor);
+	if (!iso)
+		return -1;
+
+	blkid_probe_set_version(pr, "High Sierra");
+	blkid_probe_set_label(pr, iso->volume_id, sizeof(iso->volume_id));
+	return 0;
+}
+
+static int probe_iso9660_set_uuid (blkid_probe pr, const struct iso9660_date *date)
+{
+	unsigned char buffer[16];
+	unsigned int i, zeros = 0;
+
+	buffer[0] = date->year[0];
+	buffer[1] = date->year[1];
+	buffer[2] = date->year[2];
+	buffer[3] = date->year[3];
+	buffer[4] = date->month[0];
+	buffer[5] = date->month[1];
+	buffer[6] = date->day[0];
+	buffer[7] = date->day[1];
+	buffer[8] = date->hour[0];
+	buffer[9] = date->hour[1];
+	buffer[10] = date->minute[0];
+	buffer[11] = date->minute[1];
+	buffer[12] = date->second[0];
+	buffer[13] = date->second[1];
+	buffer[14] = date->hundredth[0];
+	buffer[15] = date->hundredth[1];
+
+	/* count the number of zeros ('0') in the date buffer */
+	for (i = 0, zeros = 0; i < sizeof(buffer); i++)
+		if (buffer[i] == '0')
+			zeros++;
+
+	/* due to the iso9660 standard if all date fields are '0' and offset is 0, the date is unset */
+	if (zeros == sizeof(buffer) && date->offset == 0)
+		return 0;
+
+	/* generate an UUID using this date and return success */
+	blkid_probe_sprintf_uuid (pr, buffer, sizeof(buffer),
+		"%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
+		buffer[0], buffer[1], buffer[2], buffer[3],
+		buffer[4], buffer[5],
+		buffer[6], buffer[7],
+		buffer[8], buffer[9],
+		buffer[10], buffer[11],
+		buffer[12], buffer[13],
+		buffer[14], buffer[15]);
+
+	return 1;
+}
+
+static int is_str_empty(const unsigned char *str, size_t len)
+{
+	size_t i;
+
+	if (!str || !*str)
+		return 1;
+
+	for (i = 0; i < len; i++)
+		if (!isspace(str[i]))
+			return 0;
+	return 1;
+}
+
+/* iso9660 [+ Microsoft Joliet Extension] */
+int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct iso_volume_descriptor *iso;
+	unsigned char label[32];
+	int i;
+	int off;
+
+	if (strcmp(mag->magic, "CDROM") == 0)
+		return probe_iso9660_hsfs(pr, mag);
+
+	iso = blkid_probe_get_sb(pr, mag, struct iso_volume_descriptor);
+	if (!iso)
+		return -1;
+
+	memcpy(label, iso->volume_id, sizeof(label));
+
+	if (!is_str_empty(iso->system_id, sizeof(iso->system_id)))
+		blkid_probe_set_id_label(pr, "SYSTEM_ID",
+				iso->system_id, sizeof(iso->system_id));
+
+	if (!is_str_empty(iso->publisher_id, sizeof(iso->publisher_id)))
+		blkid_probe_set_id_label(pr, "PUBLISHER_ID",
+				iso->publisher_id, sizeof(iso->publisher_id));
+
+	if (!is_str_empty(iso->application_id, sizeof(iso->application_id)))
+		blkid_probe_set_id_label(pr, "APPLICATION_ID",
+				iso->application_id, sizeof(iso->application_id));
+
+	/* create an UUID using the modified/created date */
+	if (! probe_iso9660_set_uuid(pr, &iso->modified))
+		probe_iso9660_set_uuid(pr, &iso->created);
+
+	/* Joliet Extension and Boot Record */
+	off = ISO_VD_OFFSET;
+	for (i = 0; i < ISO_VD_MAX; i++) {
+		struct boot_record *boot= (struct boot_record *)
+			blkid_probe_get_buffer(pr,
+					off,
+					max(sizeof(struct boot_record),
+					    sizeof(struct iso_volume_descriptor)));
+
+		if (boot == NULL || boot->vd_type == ISO_VD_END)
+			break;
+
+		if (boot->vd_type == ISO_VD_BOOT_RECORD) {
+			if (!is_str_empty(boot->boot_system_id,
+					  sizeof(boot->boot_system_id)))
+				blkid_probe_set_id_label(pr, "BOOT_SYSTEM_ID",
+							boot->boot_system_id,
+							sizeof(boot->boot_system_id));
+			off += ISO_SECTOR_SIZE;
+			continue;
+		}
+
+		/* Not a Boot record, lets see if its supplemntary volume descriptor */
+		iso = (struct iso_volume_descriptor *) boot;
+
+		if (iso->vd_type != ISO_VD_SUPPLEMENTARY) {
+			off += ISO_SECTOR_SIZE;
+			continue;
+		}
+
+		if (memcmp(iso->escape_sequences, "%/@", 3) == 0 ||
+		    memcmp(iso->escape_sequences, "%/C", 3) == 0 ||
+		    memcmp(iso->escape_sequences, "%/E", 3) == 0) {
+
+			blkid_probe_set_version(pr, "Joliet Extension");
+
+			/* Is the Joliet (UTF16BE) label equal to the label in
+			 * the PVD? If yes, use PVD label.  The Jolied version
+			 * of the label could be trimed (because UTF16..).
+			 */
+			if (ascii_eq_utf16be(label, iso->volume_id, 32))
+				break;
+
+			blkid_probe_set_utf8label(pr,
+					iso->volume_id,
+					sizeof(iso->volume_id),
+					BLKID_ENC_UTF16BE);
+			goto has_label;
+		}
+		off += ISO_SECTOR_SIZE;
+	}
+
+	/* Joliet not found, let use standard iso label */
+	blkid_probe_set_label(pr, label, sizeof(label));
+
+has_label:
+	return 0;
+}
+
+const struct blkid_idinfo iso9660_idinfo =
+{
+	.name		= "iso9660",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_iso9660,
+	.flags		= BLKID_IDINFO_TOLERANT,
+	.magics		=
+	{
+		{ .magic = "CD001", .len = 5, .kboff = 32, .sboff = 1 },
+		{ .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9 },
+		{ NULL }
+	}
+};
+