summaryrefslogtreecommitdiffstats
path: root/libglusterfs/src/hashfn.c
diff options
context:
space:
mode:
Diffstat (limited to 'libglusterfs/src/hashfn.c')
-rw-r--r--libglusterfs/src/hashfn.c262
1 files changed, 130 insertions, 132 deletions
diff --git a/libglusterfs/src/hashfn.c b/libglusterfs/src/hashfn.c
index 62f7ab87800..5c4561f1ee8 100644
--- a/libglusterfs/src/hashfn.c
+++ b/libglusterfs/src/hashfn.c
@@ -13,21 +13,20 @@
#include "hashfn.h"
-#define get16bits(d) (*((const uint16_t *) (d)))
+#define get16bits(d) (*((const uint16_t *)(d)))
#define DM_DELTA 0x9E3779B9
-#define DM_FULLROUNDS 10 /* 32 is overkill, 16 is strong crypto */
-#define DM_PARTROUNDS 6 /* 6 gets complete mixing */
-
+#define DM_FULLROUNDS 10 /* 32 is overkill, 16 is strong crypto */
+#define DM_PARTROUNDS 6 /* 6 gets complete mixing */
uint32_t
-ReallySimpleHash (char *path, int len)
+ReallySimpleHash(char *path, int len)
{
- uint32_t hash = 0;
- for (;len > 0; len--)
- hash ^= (char)path[len];
+ uint32_t hash = 0;
+ for (; len > 0; len--)
+ hash ^= (char)path[len];
- return hash;
+ return hash;
}
/*
@@ -37,146 +36,145 @@ ReallySimpleHash (char *path, int len)
/* In any case make sure, you return 1 */
-uint32_t SuperFastHash (const char * data, int32_t len) {
- uint32_t hash = len, tmp;
- int32_t rem;
-
- if (len <= 1 || data == NULL) return 1;
-
- rem = len & 3;
- len >>= 2;
-
- /* Main loop */
- for (;len > 0; len--) {
- hash += get16bits (data);
- tmp = (get16bits (data+2) << 11) ^ hash;
- hash = (hash << 16) ^ tmp;
- data += 2*sizeof (uint16_t);
- hash += hash >> 11;
- }
-
- /* Handle end cases */
- switch (rem) {
- case 3: hash += get16bits (data);
- hash ^= hash << 16;
- hash ^= data[sizeof (uint16_t)] << 18;
- hash += hash >> 11;
- break;
- case 2: hash += get16bits (data);
- hash ^= hash << 11;
- hash += hash >> 17;
- break;
- case 1: hash += *data;
- hash ^= hash << 10;
- hash += hash >> 1;
- }
-
- /* Force "avalanching" of final 127 bits */
- hash ^= hash << 3;
- hash += hash >> 5;
- hash ^= hash << 4;
- hash += hash >> 17;
- hash ^= hash << 25;
- hash += hash >> 6;
-
- return hash;
+uint32_t
+SuperFastHash(const char *data, int32_t len)
+{
+ uint32_t hash = len, tmp;
+ int32_t rem;
+
+ if (len <= 1 || data == NULL)
+ return 1;
+
+ rem = len & 3;
+ len >>= 2;
+
+ /* Main loop */
+ for (; len > 0; len--) {
+ hash += get16bits(data);
+ tmp = (get16bits(data + 2) << 11) ^ hash;
+ hash = (hash << 16) ^ tmp;
+ data += 2 * sizeof(uint16_t);
+ hash += hash >> 11;
+ }
+
+ /* Handle end cases */
+ switch (rem) {
+ case 3:
+ hash += get16bits(data);
+ hash ^= hash << 16;
+ hash ^= data[sizeof(uint16_t)] << 18;
+ hash += hash >> 11;
+ break;
+ case 2:
+ hash += get16bits(data);
+ hash ^= hash << 11;
+ hash += hash >> 17;
+ break;
+ case 1:
+ hash += *data;
+ hash ^= hash << 10;
+ hash += hash >> 1;
+ }
+
+ /* Force "avalanching" of final 127 bits */
+ hash ^= hash << 3;
+ hash += hash >> 5;
+ hash ^= hash << 4;
+ hash += hash >> 17;
+ hash ^= hash << 25;
+ hash += hash >> 6;
+
+ return hash;
}
-
/* Davies-Meyer hashing function implementation
*/
static int
-dm_round (int rounds, uint32_t *array, uint32_t *h0, uint32_t *h1)
+dm_round(int rounds, uint32_t *array, uint32_t *h0, uint32_t *h1)
{
- uint32_t sum = 0;
- int n = 0;
- uint32_t b0 = 0;
- uint32_t b1 = 0;
-
- b0 = *h0;
- b1 = *h1;
-
- n = rounds;
-
- do {
- sum += DM_DELTA;
- b0 += ((b1 << 4) + array[0])
- ^ (b1 + sum)
- ^ ((b1 >> 5) + array[1]);
- b1 += ((b0 << 4) + array[2])
- ^ (b0 + sum)
- ^ ((b0 >> 5) + array[3]);
- } while (--n);
-
- *h0 += b0;
- *h1 += b1;
-
- return 0;
-}
+ uint32_t sum = 0;
+ int n = 0;
+ uint32_t b0 = 0;
+ uint32_t b1 = 0;
+
+ b0 = *h0;
+ b1 = *h1;
+
+ n = rounds;
+
+ do {
+ sum += DM_DELTA;
+ b0 += ((b1 << 4) + array[0]) ^ (b1 + sum) ^ ((b1 >> 5) + array[1]);
+ b1 += ((b0 << 4) + array[2]) ^ (b0 + sum) ^ ((b0 >> 5) + array[3]);
+ } while (--n);
+ *h0 += b0;
+ *h1 += b1;
+
+ return 0;
+}
uint32_t
-__pad (int len)
+__pad(int len)
{
- uint32_t pad = 0;
+ uint32_t pad = 0;
- pad = (uint32_t) len | ((uint32_t) len << 8);
- pad |= pad << 16;
+ pad = (uint32_t)len | ((uint32_t)len << 8);
+ pad |= pad << 16;
- return pad;
+ return pad;
}
uint32_t
-gf_dm_hashfn (const char *msg, int len)
+gf_dm_hashfn(const char *msg, int len)
{
- uint32_t h0 = 0x9464a485;
- uint32_t h1 = 0x542e1a94;
- uint32_t array[4];
- uint32_t pad = 0;
- int i = 0;
- int j = 0;
- int full_quads = 0;
- int full_words = 0;
- int full_bytes = 0;
- uint32_t *intmsg = NULL;
- int word = 0;
-
-
- intmsg = (uint32_t *) msg;
- pad = __pad (len);
-
- full_bytes = len;
- full_words = len / 4;
- full_quads = len / 16;
-
- for (i = 0; i < full_quads; i++) {
- for (j = 0; j < 4; j++) {
- word = *intmsg;
- array[j] = word;
- intmsg++;
- full_words--;
- full_bytes -= 4;
- }
- dm_round (DM_PARTROUNDS, &array[0], &h0, &h1);
- }
-
+ uint32_t h0 = 0x9464a485;
+ uint32_t h1 = 0x542e1a94;
+ uint32_t array[4];
+ uint32_t pad = 0;
+ int i = 0;
+ int j = 0;
+ int full_quads = 0;
+ int full_words = 0;
+ int full_bytes = 0;
+ uint32_t *intmsg = NULL;
+ int word = 0;
+
+ intmsg = (uint32_t *)msg;
+ pad = __pad(len);
+
+ full_bytes = len;
+ full_words = len / 4;
+ full_quads = len / 16;
+
+ for (i = 0; i < full_quads; i++) {
for (j = 0; j < 4; j++) {
- if (full_words) {
- word = *intmsg;
- array[j] = word;
- intmsg++;
- full_words--;
- full_bytes -= 4;
- } else {
- array[j] = pad;
- while (full_bytes) {
- array[j] <<= 8;
- array[j] |= msg[len - full_bytes];
- full_bytes--;
- }
- }
+ word = *intmsg;
+ array[j] = word;
+ intmsg++;
+ full_words--;
+ full_bytes -= 4;
+ }
+ dm_round(DM_PARTROUNDS, &array[0], &h0, &h1);
+ }
+
+ for (j = 0; j < 4; j++) {
+ if (full_words) {
+ word = *intmsg;
+ array[j] = word;
+ intmsg++;
+ full_words--;
+ full_bytes -= 4;
+ } else {
+ array[j] = pad;
+ while (full_bytes) {
+ array[j] <<= 8;
+ array[j] |= msg[len - full_bytes];
+ full_bytes--;
+ }
}
- dm_round (DM_FULLROUNDS, &array[0], &h0, &h1);
+ }
+ dm_round(DM_FULLROUNDS, &array[0], &h0, &h1);
- return h0 ^ h1;
+ return h0 ^ h1;
}
generated by cgit (git 2.34.1) at 2024-11-18 22:20:47 +0000