C++ (Cpp) blkid_probe_set_magic Examples

Example #1

File: via_raid.c Project: Romutk/lab3.2n

static int probe_viaraid(blkid_probe pr, const struct blkid_idmag *mag)
{
	uint64_t off;
	struct via_metadata *v;

	if (pr->size < 0x10000)
		return -1;
	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
		return -1;

	off = ((pr->size / 0x200)-1) * 0x200;

	v = (struct via_metadata *)
			blkid_probe_get_buffer(pr,
				off,
				sizeof(struct via_metadata));
	if (!v)
		return -1;
	if (le16_to_cpu(v->signature) != VIA_SIGNATURE)
		return -1;
	if (v->version_number > 2)
		return -1;
	if (!via_checksum(v))
		return -1;
	if (blkid_probe_sprintf_version(pr, "%u", v->version_number) != 0)
		return -1;
	if (blkid_probe_set_magic(pr, off,
				sizeof(v->signature),
				(unsigned char *) &v->signature))
		return -1;
	return 0;
}

Example #2

File: superblocks.c Project: HorvathAkosPeter/util-linux

/*
 * The blkid_do_probe() backend.
 */
static int superblocks_probe(blkid_probe pr, struct blkid_chain *chn)
{
	size_t i;
	int rc = BLKID_PROBE_NONE;

	if (!pr || chn->idx < -1)
		return -EINVAL;

	blkid_probe_chain_reset_values(pr, chn);

	if (pr->flags & BLKID_FL_NOSCAN_DEV)
		return BLKID_PROBE_NONE;

	if (pr->size <= 0 || (pr->size <= 1024 && !S_ISCHR(pr->mode)))
		/* Ignore very very small block devices or regular files (e.g.
		 * extended partitions). Note that size of the UBI char devices
		 * is 1 byte */
		return BLKID_PROBE_NONE;

	DBG(LOWPROBE, ul_debug("--> starting probing loop [SUBLKS idx=%d]",
		chn->idx));

	i = chn->idx < 0 ? 0 : chn->idx + 1U;

	for ( ; i < ARRAY_SIZE(idinfos); i++) {
		const struct blkid_idinfo *id;
		const struct blkid_idmag *mag = NULL;
		uint64_t off = 0;

		chn->idx = i;
		id = idinfos[i];

		if (chn->fltr && blkid_bmp_get_item(chn->fltr, i)) {
			DBG(LOWPROBE, ul_debug("filter out: %s", id->name));
			rc = BLKID_PROBE_NONE;
			continue;
		}

		if (id->minsz && id->minsz > pr->size) {
			rc = BLKID_PROBE_NONE;
			continue;	/* the device is too small */
		}

		/* don't probe for RAIDs, swap or journal on CD/DVDs */
		if ((id->usage & (BLKID_USAGE_RAID | BLKID_USAGE_OTHER)) &&
		    blkid_probe_is_cdrom(pr)) {
			rc = BLKID_PROBE_NONE;
			continue;
		}

		/* don't probe for RAIDs on floppies */
		if ((id->usage & BLKID_USAGE_RAID) && blkid_probe_is_tiny(pr)) {
			rc = BLKID_PROBE_NONE;
			continue;
		}

		DBG(LOWPROBE, ul_debug("[%zd] %s:", i, id->name));

		rc = blkid_probe_get_idmag(pr, id, &off, &mag);
		if (rc < 0)
			break;
		if (rc != BLKID_PROBE_OK)
			continue;

		/* final check by probing function */
		if (id->probefunc) {
			DBG(LOWPROBE, ul_debug("\tcall probefunc()"));
			rc = id->probefunc(pr, mag);
			if (rc != BLKID_PROBE_OK) {
				blkid_probe_chain_reset_values(pr, chn);
				if (rc < 0)
					break;
				continue;
			}
		}

		/* all cheks passed */
		if (chn->flags & BLKID_SUBLKS_TYPE)
			rc = blkid_probe_set_value(pr, "TYPE",
				(unsigned char *) id->name,
				strlen(id->name) + 1);

		if (!rc)
			rc = blkid_probe_set_usage(pr, id->usage);

		if (!rc && mag)
			rc = blkid_probe_set_magic(pr, off, mag->len,
					(unsigned char *) mag->magic);
		if (rc) {
			blkid_probe_chain_reset_values(pr, chn);
			DBG(LOWPROBE, ul_debug("failed to set result -- ignore"));
			continue;
		}

		DBG(LOWPROBE, ul_debug("<-- leaving probing loop (type=%s) [SUBLKS idx=%d]",
			id->name, chn->idx));
		return BLKID_PROBE_OK;
	}

	DBG(LOWPROBE, ul_debug("<-- leaving probing loop (failed=%d) [SUBLKS idx=%d]",
			rc, chn->idx));
	return rc;
}