diff options
Diffstat (limited to 'extras/volume_id/lib/udf.c')
| -rw-r--r-- | extras/volume_id/lib/udf.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/extras/volume_id/lib/udf.c b/extras/volume_id/lib/udf.c new file mode 100644 index 0000000000..d7497ec51b --- /dev/null +++ b/extras/volume_id/lib/udf.c @@ -0,0 +1,178 @@ +/* + * 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 volume_descriptor { + struct descriptor_tag { + uint16_t id; + uint16_t version; + uint8_t checksum; + uint8_t reserved; + uint16_t serial; + uint16_t crc; + uint16_t crc_len; + uint32_t location; + } PACKED tag; + union { + struct anchor_descriptor { + uint32_t length; + uint32_t location; + } PACKED anchor; + struct primary_descriptor { + uint32_t seq_num; + uint32_t desc_num; + struct dstring { + uint8_t clen; + uint8_t c[31]; + } PACKED ident; + } PACKED primary; + } PACKED type; +} PACKED; + +struct volume_structure_descriptor { + uint8_t type; + uint8_t id[5]; + uint8_t version; +} PACKED; + +#define UDF_VSD_OFFSET 0x8000 + +int volume_id_probe_udf(struct volume_id *id, uint64_t off) +{ + struct volume_descriptor *vd; + struct volume_structure_descriptor *vsd; + unsigned int bs; + unsigned int b; + unsigned int type; + unsigned int count; + unsigned int loc; + unsigned int clen; + + dbg("probing at offset 0x%llx", (unsigned long long) off); + + vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200); + if (vsd == NULL) + return -1; + + if (memcmp(vsd->id, "NSR02", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "NSR03", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "BEA01", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "BOOT2", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "CD001", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "CDW02", 5) == 0) + goto blocksize; + if (memcmp(vsd->id, "TEA03", 5) == 0) + goto blocksize; + return -1; + +blocksize: + /* search the next VSD to get the logical block size of the volume */ + for (bs = 0x800; bs < 0x8000; bs += 0x800) { + vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800); + if (vsd == NULL) + return -1; + dbg("test for blocksize: 0x%x", bs); + if (vsd->id[0] != '\0') + goto nsr; + } + return -1; + +nsr: + /* search the list of VSDs for a NSR descriptor */ + for (b = 0; b < 64; b++) { + vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800); + if (vsd == NULL) + return -1; + + dbg("vsd: %c%c%c%c%c", + vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]); + + if (vsd->id[0] == '\0') + return -1; + if (memcmp(vsd->id, "NSR02", 5) == 0) + goto anchor; + if (memcmp(vsd->id, "NSR03", 5) == 0) + goto anchor; + } + return -1; + +anchor: + /* read anchor volume descriptor */ + vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + (256 * bs), 0x200); + if (vd == NULL) + return -1; + + type = le16_to_cpu(vd->tag.id); + if (type != 2) /* TAG_ID_AVDP */ + goto found; + + /* get desriptor list address and block count */ + count = le32_to_cpu(vd->type.anchor.length) / bs; + loc = le32_to_cpu(vd->type.anchor.location); + dbg("0x%x descriptors starting at logical secor 0x%x", count, loc); + + /* pick the primary descriptor from the list */ + for (b = 0; b < count; b++) { + vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200); + if (vd == NULL) + return -1; + + type = le16_to_cpu(vd->tag.id); + dbg("descriptor type %i", type); + + /* check validity */ + if (type == 0) + goto found; + if (le32_to_cpu(vd->tag.location) != loc + b) + goto found; + + if (type == 1) /* TAG_ID_PVD */ + goto pvd; + } + goto found; + +pvd: + volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32); + + clen = vd->type.primary.ident.clen; + dbg("label string charsize=%i bit", clen); + if (clen == 8) + volume_id_set_label_string(id, vd->type.primary.ident.c, 31); + else if (clen == 16) + volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE,31); + +found: + volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); + id->type = "udf"; + + return 0; +} |