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-rw-r--r--libblkid/src/superblocks/iso9660.c336
1 files changed, 336 insertions, 0 deletions
diff --git a/libblkid/src/superblocks/iso9660.c b/libblkid/src/superblocks/iso9660.c
new file mode 100644
index 0000000..289a325
--- /dev/null
+++ b/libblkid/src/superblocks/iso9660.c
@@ -0,0 +1,336 @@
+/*
+ * 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"
+#include "cctype.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 unused2[94];
+ unsigned char volume_set_id[128];
+ unsigned char publisher_id[128];
+ unsigned char data_preparer_id[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_BOOT_RECORD 0x0
+#define ISO_VD_PRIMARY 0x1
+#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));
+
+/* 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 errno ? -errno : 1;
+
+ blkid_probe_set_block_size(pr, ISO_SECTOR_SIZE);
+ 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;
+}
+
+static int is_utf16be_str_empty(unsigned char *utf16, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i += 2) {
+ if (utf16[i] != 0x0 || !isspace(utf16[i + 1]))
+ return 0;
+ }
+ return 1;
+}
+
+/* if @utf16 is prefix of @ascii (ignoring non-representable characters and upper-case conversion)
+ * then reconstruct prefix from @utf16 and @ascii, append suffix from @ascii, fill it into @out
+ * and returns length of bytes written into @out; otherwise returns zero */
+static size_t merge_utf16be_ascii(unsigned char *out, const unsigned char *utf16, const unsigned char *ascii, size_t len)
+{
+ size_t o, a, u;
+
+ for (o = 0, a = 0, u = 0; u + 1 < len && a < len; o += 2, a++, u += 2) {
+ /* Surrogate pair with code point above U+FFFF */
+ if (utf16[u] >= 0xD8 && utf16[u] <= 0xDB && u + 3 < len &&
+ utf16[u + 2] >= 0xDC && utf16[u + 2] <= 0xDF) {
+ out[o++] = utf16[u++];
+ out[o++] = utf16[u++];
+ }
+ /* Value '_' is replacement for non-representable character */
+ if (ascii[a] == '_') {
+ out[o] = utf16[u];
+ out[o + 1] = utf16[u + 1];
+ } else if (utf16[u] == 0x00 && utf16[u + 1] == '_') {
+ out[o] = 0x00;
+ out[o + 1] = ascii[a];
+ } else if (utf16[u] == 0x00 && c_toupper(ascii[a]) == c_toupper(utf16[u + 1])) {
+ out[o] = 0x00;
+ out[o + 1] = c_isupper(ascii[a]) ? utf16[u + 1] : ascii[a];
+ } else {
+ return 0;
+ }
+ }
+
+ for (; a < len; o += 2, a++) {
+ out[o] = 0x00;
+ out[o + 1] = ascii[a];
+ }
+
+ return o;
+}
+
+/* iso9660 [+ Microsoft Joliet Extension] */
+static int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct boot_record *boot = NULL;
+ struct iso_volume_descriptor *pvd = NULL;
+ struct iso_volume_descriptor *joliet = NULL;
+ unsigned char buf[256];
+ size_t len;
+ int is_unicode_empty;
+ int is_ascii_empty;
+ int i;
+ uint64_t off;
+
+ if (blkid_probe_get_hint(pr, mag->hoff, &off) < 0)
+ off = 0;
+
+ if (off % ISO_SECTOR_SIZE)
+ return 1;
+
+ if (strcmp(mag->magic, "CDROM") == 0)
+ return probe_iso9660_hsfs(pr, mag);
+
+ for (i = 0, off += ISO_SUPERBLOCK_OFFSET; i < ISO_VD_MAX && (!boot || !pvd || !joliet); i++, off += ISO_SECTOR_SIZE) {
+ unsigned char *desc =
+ blkid_probe_get_buffer(pr,
+ off,
+ max(sizeof(struct boot_record),
+ sizeof(struct iso_volume_descriptor)));
+
+ if (desc == NULL || desc[0] == ISO_VD_END)
+ break;
+ else if (!boot && desc[0] == ISO_VD_BOOT_RECORD)
+ boot = (struct boot_record *)desc;
+ else if (!pvd && desc[0] == ISO_VD_PRIMARY)
+ pvd = (struct iso_volume_descriptor *)desc;
+ else if (!joliet && desc[0] == ISO_VD_SUPPLEMENTARY) {
+ joliet = (struct iso_volume_descriptor *)desc;
+ if (memcmp(joliet->escape_sequences, "%/@", 3) != 0 &&
+ memcmp(joliet->escape_sequences, "%/C", 3) != 0 &&
+ memcmp(joliet->escape_sequences, "%/E", 3) != 0)
+ joliet = NULL;
+ }
+ }
+
+ if (!pvd)
+ return errno ? -errno : 1;
+
+ blkid_probe_set_block_size(pr, ISO_SECTOR_SIZE);
+
+ if (joliet && (len = merge_utf16be_ascii(buf, joliet->system_id, pvd->system_id, sizeof(pvd->system_id))) != 0)
+ blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", buf, len, UL_ENCODE_UTF16BE);
+ else if (joliet)
+ blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", joliet->system_id, sizeof(joliet->system_id), UL_ENCODE_UTF16BE);
+ else
+ blkid_probe_set_id_label(pr, "SYSTEM_ID", pvd->system_id, sizeof(pvd->system_id));
+
+ if (joliet && (len = merge_utf16be_ascii(buf, joliet->volume_set_id, pvd->volume_set_id, sizeof(pvd->volume_set_id))) != 0)
+ blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", buf, len, UL_ENCODE_UTF16BE);
+ else if (joliet)
+ blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", joliet->volume_set_id, sizeof(joliet->volume_set_id), UL_ENCODE_UTF16BE);
+ else
+ blkid_probe_set_id_label(pr, "VOLUME_SET_ID", pvd->volume_set_id, sizeof(pvd->volume_set_id));
+
+ is_ascii_empty = (is_str_empty(pvd->publisher_id, sizeof(pvd->publisher_id)) || pvd->publisher_id[0] == '_');
+ is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->publisher_id, sizeof(joliet->publisher_id)) || (joliet->publisher_id[0] == 0x00 && joliet->publisher_id[1] == '_'));
+ if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->publisher_id, pvd->publisher_id, sizeof(pvd->publisher_id))) != 0)
+ blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", buf, len, UL_ENCODE_UTF16BE);
+ else if (!is_unicode_empty)
+ blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", joliet->publisher_id, sizeof(joliet->publisher_id), UL_ENCODE_UTF16BE);
+ else if (!is_ascii_empty)
+ blkid_probe_set_id_label(pr, "PUBLISHER_ID", pvd->publisher_id, sizeof(pvd->publisher_id));
+
+ is_ascii_empty = (is_str_empty(pvd->data_preparer_id, sizeof(pvd->data_preparer_id)) || pvd->data_preparer_id[0] == '_');
+ is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->data_preparer_id, sizeof(joliet->data_preparer_id)) || (joliet->data_preparer_id[0] == 0x00 && joliet->data_preparer_id[1] == '_'));
+ if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->data_preparer_id, pvd->data_preparer_id, sizeof(pvd->data_preparer_id))) != 0)
+ blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", buf, len, UL_ENCODE_UTF16BE);
+ else if (!is_unicode_empty)
+ blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", joliet->data_preparer_id, sizeof(joliet->data_preparer_id), UL_ENCODE_UTF16BE);
+ else if (!is_ascii_empty)
+ blkid_probe_set_id_label(pr, "DATA_PREPARER_ID", pvd->data_preparer_id, sizeof(pvd->data_preparer_id));
+
+ is_ascii_empty = (is_str_empty(pvd->application_id, sizeof(pvd->application_id)) || pvd->application_id[0] == '_');
+ is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->application_id, sizeof(joliet->application_id)) || (joliet->application_id[0] == 0x00 && joliet->application_id[1] == '_'));
+ if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->application_id, pvd->application_id, sizeof(pvd->application_id))) != 0)
+ blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", buf, len, UL_ENCODE_UTF16BE);
+ else if (!is_unicode_empty)
+ blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", joliet->application_id, sizeof(joliet->application_id), UL_ENCODE_UTF16BE);
+ else if (!is_ascii_empty)
+ blkid_probe_set_id_label(pr, "APPLICATION_ID", pvd->application_id, sizeof(pvd->application_id));
+
+ /* create an UUID using the modified/created date */
+ if (! probe_iso9660_set_uuid(pr, &pvd->modified))
+ probe_iso9660_set_uuid(pr, &pvd->created);
+
+ if (boot)
+ blkid_probe_set_id_label(pr, "BOOT_SYSTEM_ID",
+ boot->boot_system_id,
+ sizeof(boot->boot_system_id));
+
+ if (joliet)
+ blkid_probe_set_version(pr, "Joliet Extension");
+
+ /* Label in Joliet is UNICODE (UTF16BE) but can contain only 16 characters. Label in PVD is
+ * subset of ASCII but can contain up to the 32 characters. Non-representable characters are
+ * stored as replacement character '_'. Label in Joliet is in most cases trimmed but UNICODE
+ * version of label in PVD. Based on these facts try to reconstruct original label if label
+ * in Joliet is prefix of the label in PVD (ignoring non-representable characters).
+ */
+ if (joliet && (len = merge_utf16be_ascii(buf, joliet->volume_id, pvd->volume_id, sizeof(pvd->volume_id))) != 0)
+ blkid_probe_set_utf8label(pr, buf, len, UL_ENCODE_UTF16BE);
+ else if (joliet)
+ blkid_probe_set_utf8label(pr, joliet->volume_id, sizeof(joliet->volume_id), UL_ENCODE_UTF16BE);
+ else
+ blkid_probe_set_label(pr, pvd->volume_id, sizeof(pvd->volume_id));
+
+ 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, .hoff = "session_offset" },
+ { .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9, .hoff = "session_offset" },
+ { NULL }
+ }
+};
+