/* * volume_id - reads filesystem label and uuid * * Copyright (C) 2004 Kay Sievers * * 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 #endif #include #include #include #include #include #include #include "volume_id.h" #include "logging.h" #include "util.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 = (struct iso_volume_descriptor *) 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; }