static void
cacheDigestInit(CacheDigest * cd, int capacity, int bpe)
{
const size_t mask_size = cacheDigestCalcMaskSize(capacity, bpe);
assert(cd);
assert(capacity > 0 && bpe > 0);
assert(mask_size > 0);
cd->capacity = capacity;
cd->bits_per_entry = bpe;
cd->mask_size = mask_size;
cd->mask = xcalloc(cd->mask_size, 1);
debug(70, 2) ("cacheDigestInit: capacity: %d entries, bpe: %d; size: %d bytes\n",
cd->capacity, cd->bits_per_entry, cd->mask_size);
}
static int
peerDigestSetCBlock(PeerDigest * pd, const char *buf)
{
StoreDigestCBlock cblock;
int freed_size = 0;
const char *host = strBuf(pd->host);
xmemcpy(&cblock, buf, sizeof(cblock));
/* network -> host conversions */
cblock.ver.current = ntohs(cblock.ver.current);
cblock.ver.required = ntohs(cblock.ver.required);
cblock.capacity = ntohl(cblock.capacity);
cblock.count = ntohl(cblock.count);
cblock.del_count = ntohl(cblock.del_count);
cblock.mask_size = ntohl(cblock.mask_size);
debug(72, 2) ("got digest cblock from %s; ver: %d (req: %d)\n",
host, (int) cblock.ver.current, (int) cblock.ver.required);
debug(72, 2) ("\t size: %d bytes, e-cnt: %d, e-util: %d%%\n",
cblock.mask_size, cblock.count,
xpercentInt(cblock.count, cblock.capacity));
/* check version requirements (both ways) */
if (cblock.ver.required > CacheDigestVer.current) {
debug(72, 1) ("%s digest requires version %d; have: %d\n",
host, cblock.ver.required, CacheDigestVer.current);
return 0;
}
if (cblock.ver.current < CacheDigestVer.required) {
debug(72, 1) ("%s digest is version %d; we require: %d\n",
host, cblock.ver.current, CacheDigestVer.required);
return 0;
}
/* check consistency */
if (cblock.ver.required > cblock.ver.current ||
cblock.mask_size <= 0 || cblock.capacity <= 0 ||
cblock.bits_per_entry <= 0 || cblock.hash_func_count <= 0) {
debug(72, 0) ("%s digest cblock is corrupted.\n", host);
return 0;
}
/* check consistency further */
if (cblock.mask_size != cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry)) {
debug(72, 0) ("%s digest cblock is corrupted (mask size mismatch: %d ? %d).\n",
host, cblock.mask_size, cacheDigestCalcMaskSize(cblock.capacity, cblock.bits_per_entry));
return 0;
}
/* there are some things we cannot do yet */
if (cblock.hash_func_count != CacheDigestHashFuncCount) {
debug(72, 0) ("%s digest: unsupported #hash functions: %d ? %d.\n",
host, cblock.hash_func_count, CacheDigestHashFuncCount);
return 0;
}
/*
* no cblock bugs below this point
*/
/* check size changes */
if (pd->cd && cblock.mask_size != pd->cd->mask_size) {
debug(72, 2) ("%s digest changed size: %d -> %d\n",
host, cblock.mask_size, pd->cd->mask_size);
freed_size = pd->cd->mask_size;
cacheDigestDestroy(pd->cd);
pd->cd = NULL;
}
if (!pd->cd) {
debug(72, 2) ("creating %s digest; size: %d (%+d) bytes\n",
host, cblock.mask_size, (int) (cblock.mask_size - freed_size));
pd->cd = cacheDigestCreate(cblock.capacity, cblock.bits_per_entry);
if (cblock.mask_size >= freed_size)
kb_incr(&Counter.cd.memory, cblock.mask_size - freed_size);
}
assert(pd->cd);
/* these assignments leave us in an inconsistent state until we finish reading the digest */
pd->cd->count = cblock.count;
pd->cd->del_count = cblock.del_count;
return 1;
}