diff options
Diffstat (limited to 'util-linux/volume_id/iso9660.c')
| -rw-r--r-- | util-linux/volume_id/iso9660.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/util-linux/volume_id/iso9660.c b/util-linux/volume_id/iso9660.c new file mode 100644 index 0000000..c15608c --- /dev/null +++ b/util-linux/volume_id/iso9660.c @@ -0,0 +1,119 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "volume_id_internal.h" + +#define ISO_SUPERBLOCK_OFFSET 0x8000 +#define ISO_SECTOR_SIZE 0x800 +#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE) +#define ISO_VD_PRIMARY 0x1 +#define ISO_VD_SUPPLEMENTARY 0x2 +#define ISO_VD_END 0xff +#define ISO_VD_MAX 16 + +struct iso_volume_descriptor { + uint8_t vd_type; + uint8_t vd_id[5]; + uint8_t vd_version; + uint8_t flags; + uint8_t system_id[32]; + uint8_t volume_id[32]; + uint8_t unused[8]; + uint8_t space_size[8]; + uint8_t escape_sequences[8]; +} __attribute__((__packed__)); + +struct high_sierra_volume_descriptor { + uint8_t foo[8]; + uint8_t type; + uint8_t id[4]; + uint8_t version; +} __attribute__((__packed__)); + +int volume_id_probe_iso9660(struct volume_id *id, uint64_t off) +{ + uint8_t *buf; + struct iso_volume_descriptor *is; + struct high_sierra_volume_descriptor *hs; + + dbg("probing at offset 0x%llx", (unsigned long long) off); + + buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200); + if (buf == NULL) + return -1; + + is = (struct iso_volume_descriptor *) buf; + + if (memcmp(is->vd_id, "CD001", 5) == 0) { + int vd_offset; + int i; + + dbg("read label from PVD"); +// volume_id_set_label_raw(id, is->volume_id, 32); + volume_id_set_label_string(id, is->volume_id, 32); + + dbg("looking for SVDs"); + vd_offset = ISO_VD_OFFSET; + for (i = 0; i < ISO_VD_MAX; i++) { + uint8_t svd_label[64]; + + is = volume_id_get_buffer(id, off + vd_offset, 0x200); + if (is == NULL || is->vd_type == ISO_VD_END) + break; + if (is->vd_type != ISO_VD_SUPPLEMENTARY) + continue; + + dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset)); + if (memcmp(is->escape_sequences, "%/@", 3) == 0 + || memcmp(is->escape_sequences, "%/C", 3) == 0 + || memcmp(is->escape_sequences, "%/E", 3) == 0 + ) { + dbg("Joliet extension found"); + volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32); + if (memcmp(id->label, svd_label, 16) == 0) { + dbg("SVD label is identical, use the possibly longer PVD one"); + break; + } + +// volume_id_set_label_raw(id, is->volume_id, 32); + volume_id_set_label_string(id, svd_label, 32); +// strcpy(id->type_version, "Joliet Extension"); + goto found; + } + vd_offset += ISO_SECTOR_SIZE; + } + goto found; + } + + hs = (struct high_sierra_volume_descriptor *) buf; + + if (memcmp(hs->id, "CDROM", 5) == 0) { +// strcpy(id->type_version, "High Sierra"); + goto found; + } + + return -1; + + found: +// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); +// id->type = "iso9660"; + + return 0; +} |