void
cch_cityhash128_with_seed (cch_uint128_t * result, const char *s, size_t len, cch_uint128_t * seme)
{
#ifdef HAVE_CITYHASH128WITHSEED
uint128 rv;
uint128 seed(seme->low, seme->high);
rv = CityHash128WithSeed(s, len, seed);
result->low = Uint128Low64(rv);
result->high = Uint128High64(rv);
#else
feature_failure(__func__);
#endif
}
Hash Hash::CityHash(const void* data, uint32_t sz)
{
hash_type newHash;
//use a different seed on the first 4 bytes than on the last byte
uint128 someSeed(503,127);
((uint128*)&newHash)[0] = CityHash128WithSeed((const char*)data, sz, someSeed);
newHash[4] = CityHash32((const char*)data, sz);
return newHash;
}
void rm_digest_update(RmDigest *digest, const unsigned char *data, RmOff size) {
switch(digest->type) {
case RM_DIGEST_EXT:
/* Data is assumed to be a hex representation of a cchecksum.
* Needs to be compressed in pure memory first.
*
* Checksum is not updated but rather overwritten.
* */
#define CHAR_TO_NUM(c) (unsigned char)(g_ascii_isdigit(c) ? c - '0' : (c - 'a') + 10)
rm_assert_gentle(data);
digest->bytes = size / 2;
digest->checksum = g_slice_alloc0(digest->bytes);
for(unsigned i = 0; i < digest->bytes; ++i) {
((guint8 *)digest->checksum)[i] =
(CHAR_TO_NUM(data[2 * i]) << 4) + CHAR_TO_NUM(data[2 * i + 1]);
}
break;
case RM_DIGEST_MD5:
case RM_DIGEST_SHA512:
case RM_DIGEST_SHA256:
case RM_DIGEST_SHA1:
g_checksum_update(digest->glib_checksum, (const guchar *)data, size);
break;
case RM_DIGEST_SPOOKY32:
digest->checksum[0].first = spooky_hash32(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY64:
digest->checksum[0].first = spooky_hash64(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY:
spooky_hash128(data, size, (uint64_t *)&digest->checksum[0].first,
(uint64_t *)&digest->checksum[0].second);
break;
case RM_DIGEST_XXHASH:
digest->checksum[0].first = XXH64(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_FARMHASH:
digest->checksum[0].first = cfarmhash((const char *)data, size);
break;
case RM_DIGEST_MURMUR512:
case RM_DIGEST_MURMUR256:
case RM_DIGEST_MURMUR:
for(guint8 block = 0; block < (digest->bytes / 16); block++) {
#if RM_PLATFORM_32
MurmurHash3_x86_128(data, size, (uint32_t)digest->checksum[block].first,
&digest->checksum[block]); //&
#elif RM_PLATFORM_64
MurmurHash3_x64_128(data, size, (uint32_t)digest->checksum[block].first,
&digest->checksum[block]);
#else
#error "Probably not a good idea to compile rmlint on 16bit."
#endif
}
break;
case RM_DIGEST_CITY:
case RM_DIGEST_CITY256:
case RM_DIGEST_CITY512:
for(guint8 block = 0; block < (digest->bytes / 16); block++) {
/* Opt out for the more optimized version.
* This needs the crc command of sse4.2
* (available on Intel Nehalem and up; my amd box doesn't have this though)
*/
uint128 old = {digest->checksum[block].first, digest->checksum[block].second};
old = CityHash128WithSeed((const char *)data, size, old);
memcpy(&digest->checksum[block], &old, sizeof(uint128));
}
break;
case RM_DIGEST_BASTARD:
MurmurHash3_x86_128(data, size, (uint32_t)digest->checksum[0].first,
&digest->checksum[0]);
uint128 old = {digest->checksum[1].first, digest->checksum[1].second};
old = CityHash128WithSeed((const char *)data, size, old);
memcpy(&digest->checksum[1], &old, sizeof(uint128));
break;
case RM_DIGEST_CUMULATIVE: {
/* This is basically FNV1a, it is just important that the order of
* adding data to the hash has no effect on the result, so it can
* be used as a lookup key:
*
* http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
* */
RmOff hash = 0xcbf29ce484222325;
for(gsize i = 0; i < digest->bytes; ++i) {
hash ^= ((guint8 *)data)[i % size];
hash *= 0x100000001b3;
((guint8 *)digest->checksum)[i] += hash;
}
} break;
case RM_DIGEST_PARANOID:
default:
rm_assert_gentle_not_reached();
}
}
void rm_digest_update(RmDigest *digest, const unsigned char *data, RmOff size) {
switch(digest->type) {
case RM_DIGEST_MD5:
case RM_DIGEST_SHA512:
case RM_DIGEST_SHA256:
case RM_DIGEST_SHA1:
g_checksum_update(digest->glib_checksum, (const guchar *)data, size);
break;
case RM_DIGEST_SPOOKY32:
digest->checksum[0].first = spooky_hash32(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY64:
digest->checksum[0].first = spooky_hash64(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY:
spooky_hash128(data, size, &digest->checksum[0].first, &digest->checksum[0].second);
break;
case RM_DIGEST_MURMUR512:
case RM_DIGEST_MURMUR256:
case RM_DIGEST_MURMUR:
for (guint8 block = 0; block < ( digest->bytes / 16 ); block++) {
#if RM_PLATFORM_32
MurmurHash3_x86_128(data, size,
(uint32_t)digest->checksum[block].first,
&digest->checksum[block]); //&
#elif RM_PLATFORM_64
MurmurHash3_x64_128(data, size,
(uint32_t)digest->checksum[block].first,
&digest->checksum[block]);
#else
#error "Probably not a good idea to compile rmlint on 16bit."
#endif
}
break;
case RM_DIGEST_CITY:
case RM_DIGEST_CITY256:
case RM_DIGEST_CITY512:
for (guint8 block = 0; block < (digest->bytes / 16); block++) {
/* Opt out for the more optimized version.
* This needs the crc command of sse4.2
* (available on Intel Nehalem and up; my amd box doesn't have this though)
*/
#if RM_PLATFORM_64 && HAVE_SSE42
digest->checksum[block] = CityHashCrc128WithSeed((const char *)data, size, digest->checksum[block]);
#else
digest->checksum[block] = CityHash128WithSeed((const char *) data, size, digest->checksum[block]);
#endif
}
break;
case RM_DIGEST_BASTARD:
MurmurHash3_x86_128(data, size, (uint32_t)digest->checksum[0].first, &digest->checksum[0]);
#if RM_PLATFORM_64 && HAVE_SSE42
digest->checksum[1] = CityHashCrc128WithSeed((const char *)data, size, digest->checksum[1]);
#else
digest->checksum[1] = CityHash128WithSeed((const char *) data, size, digest->checksum[1]);
#endif
break;
case RM_DIGEST_CUMULATIVE: {
/* This is basically FNV1a, it is just important that the order of
* adding data to the hash has no effect on the result, so it can
* be used as a lookup key:
*
* http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
* */
RmOff hash = 0xcbf29ce484222325;
for(gsize i = 0; i < digest->bytes; ++i) {
hash ^= ((guint8 *)data)[i % size];
hash *= 0x100000001b3;
((guint8 *)digest->checksum)[i] += hash;
}
}
break;
case RM_DIGEST_PARANOID:
g_assert(size + digest->paranoid_offset <= digest->bytes);
memcpy((char *)digest->checksum + digest->paranoid_offset, data, size);
digest->paranoid_offset += size;
rm_digest_update(digest->shadow_hash, data, size);
break;
default:
g_assert_not_reached();
}
}
