-#include "hash/hash.h"
-#include "tap/tap.h"
-#include "hash/hash.c"
+#include <ccan/hash/hash.h>
+#include <ccan/tap/tap.h>
+#include <ccan/hash/hash.c>
#include <stdbool.h>
#include <string.h>
for (i = 0; i < ARRAY_WORDS; i++)
array[i] = i;
- plan_tests(55);
-
- /* hash_stable is guaranteed. */
- ok1(hash_stable(array, ARRAY_WORDS, 0) == 0x13305f8c);
- ok1(hash_stable(array, ARRAY_WORDS, 1) == 0x171abf74);
- ok1(hash_stable(array, ARRAY_WORDS, 2) == 0x7646fcc7);
- ok1(hash_stable(array, ARRAY_WORDS, 4) == 0xa758ed5);
- ok1(hash_stable(array, ARRAY_WORDS, 8) == 0x2dedc2e4);
- ok1(hash_stable(array, ARRAY_WORDS, 16) == 0x28e2076b);
- ok1(hash_stable(array, ARRAY_WORDS, 32) == 0xb73091c5);
- ok1(hash_stable(array, ARRAY_WORDS, 64) == 0x87daf5db);
- ok1(hash_stable(array, ARRAY_WORDS, 128) == 0xa16dfe20);
- ok1(hash_stable(array, ARRAY_WORDS, 256) == 0x300c63c3);
- ok1(hash_stable(array, ARRAY_WORDS, 512) == 0x255c91fc);
- ok1(hash_stable(array, ARRAY_WORDS, 1024) == 0x6357b26);
- ok1(hash_stable(array, ARRAY_WORDS, 2048) == 0x4bc5f339);
- ok1(hash_stable(array, ARRAY_WORDS, 4096) == 0x1301617c);
- ok1(hash_stable(array, ARRAY_WORDS, 8192) == 0x506792c9);
- ok1(hash_stable(array, ARRAY_WORDS, 16384) == 0xcd596705);
- ok1(hash_stable(array, ARRAY_WORDS, 32768) == 0xa8713cac);
- ok1(hash_stable(array, ARRAY_WORDS, 65536) == 0x94d9794);
- ok1(hash_stable(array, ARRAY_WORDS, 131072) == 0xac753e8);
- ok1(hash_stable(array, ARRAY_WORDS, 262144) == 0xcd8bdd20);
- ok1(hash_stable(array, ARRAY_WORDS, 524288) == 0xd44faf80);
- ok1(hash_stable(array, ARRAY_WORDS, 1048576) == 0x2547ccbe);
- ok1(hash_stable(array, ARRAY_WORDS, 2097152) == 0xbab06dbc);
- ok1(hash_stable(array, ARRAY_WORDS, 4194304) == 0xaac0e882);
- ok1(hash_stable(array, ARRAY_WORDS, 8388608) == 0x443f48d0);
- ok1(hash_stable(array, ARRAY_WORDS, 16777216) == 0xdff49fcc);
- ok1(hash_stable(array, ARRAY_WORDS, 33554432) == 0x9ce0fd65);
- ok1(hash_stable(array, ARRAY_WORDS, 67108864) == 0x9ddb1def);
- ok1(hash_stable(array, ARRAY_WORDS, 134217728) == 0x86096f25);
- ok1(hash_stable(array, ARRAY_WORDS, 268435456) == 0xe713b7b5);
- ok1(hash_stable(array, ARRAY_WORDS, 536870912) == 0x5baeffc5);
- ok1(hash_stable(array, ARRAY_WORDS, 1073741824) == 0xde874f52);
- ok1(hash_stable(array, ARRAY_WORDS, 2147483648U) == 0xeca13b4e);
-
+ plan_tests(39);
/* Hash should be the same, indep of memory alignment. */
- val = hash(array, sizeof(array), 0);
+ val = hash(array, ARRAY_WORDS, 0);
for (i = 0; i < sizeof(uint32_t); i++) {
memcpy(array2 + i, array, sizeof(array));
- ok(hash(array2 + i, sizeof(array), 0) != val,
+ ok(hash(array2 + i, ARRAY_WORDS, 0) != val,
"hash matched at offset %i", i);
}
for (j = 0; j < 256000; j++) {
for (k = 0; k < ARRAY_WORDS; k++)
array[k] = random();
- results[(hash(array, sizeof(array), 0) >> i*8)&0xFF]++;
+ results[(hash(array, ARRAY_WORDS, 0) >> i*8)&0xFF]++;
+ }
+
+ for (j = 0; j < 256; j++) {
+ if (results[j] < lowest)
+ lowest = results[j];
+ if (results[j] > highest)
+ highest = results[j];
+ }
+ /* Expect within 20% */
+ ok(lowest > 800, "Byte %i lowest %i", i, lowest);
+ ok(highest < 1200, "Byte %i highest %i", i, highest);
+ diag("Byte %i, range %u-%u", i, lowest, highest);
+ }
+
+ /* Hash of random values should have random distribution:
+ * check one byte at a time. */
+ for (i = 0; i < sizeof(uint64_t); i++) {
+ unsigned int lowest = -1U, highest = 0;
+
+ memset(results, 0, sizeof(results));
+
+ for (j = 0; j < 256000; j++) {
+ for (k = 0; k < ARRAY_WORDS; k++)
+ array[k] = random();
+ results[(hash64(array, sizeof(array)/sizeof(uint64_t),
+ 0) >> i*8)&0xFF]++;
}
for (j = 0; j < 256; j++) {
diag("hash_pointer byte %i, range %u-%u", i, lowest, highest);
}
+ if (sizeof(long) == sizeof(uint32_t))
+ ok1(hashl(array, ARRAY_WORDS, 0)
+ == hash(array, ARRAY_WORDS, 0));
+ else
+ ok1(hashl(array, ARRAY_WORDS, 0)
+ == hash64(array, ARRAY_WORDS, 0));
+
/* String hash: weak, so only test bottom byte */
for (i = 0; i < 1; i++) {
unsigned int num = 0, cursor, lowest = -1U, highest = 0;