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comparison: src/hash_key.c

src/hash_key.c

changeset 1400
7bc88ae62755
parent 1364
556e4e7608b1
equal deleted inserted replaced
1399:40c3b850f859 1400:7bc88ae62755
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE. 26 * POSSIBILITY OF SUCH DAMAGE.
27 */ 27 */
28 28
29 #include "cx/hash_key.h" 29 #include "cx/hash_key.h"
30 #include "cx/compare.h"
30 #include <string.h> 31 #include <string.h>
31 32
32 void cx_hash_murmur(CxHashKey *key) { 33 void cx_hash_murmur(CxHashKey *key) {
33 const unsigned char *data = key->data; 34 const unsigned char *data = key->data;
34 if (data == NULL) { 35 if (data == NULL) {
79 h ^= h >> 15; 80 h ^= h >> 15;
80 81
81 key->hash = h; 82 key->hash = h;
82 } 83 }
83 84
85
86 uint32_t cx_hash_u32(uint32_t x) {
87 x = ((x >> 16) ^ x) * 0x45d9f3bu;
88 x = ((x >> 16) ^ x) * 0x45d9f3bu;
89 x = (x >> 16) ^ x;
90 return x;
91 }
92
93 uint64_t cx_hash_u64(uint64_t x) {
94 x = (x ^ (x >> 30)) * UINT64_C(0xbf58476d1ce4e5b9);
95 x = (x ^ (x >> 27)) * UINT64_C(0x94d049bb133111eb);
96 x = x ^ (x >> 31);
97 return x;
98 }
99
84 CxHashKey cx_hash_key_str(const char *str) { 100 CxHashKey cx_hash_key_str(const char *str) {
85 CxHashKey key; 101 CxHashKey key;
86 key.data = str; 102 key.data = str;
87 key.len = str == NULL ? 0 : strlen(str); 103 key.len = str == NULL ? 0 : strlen(str);
88 cx_hash_murmur(&key); 104 cx_hash_murmur(&key);
108 key.data = obj; 124 key.data = obj;
109 key.len = len; 125 key.len = len;
110 cx_hash_murmur(&key); 126 cx_hash_murmur(&key);
111 return key; 127 return key;
112 } 128 }
129
130 CxHashKey cx_hash_key_u32(uint32_t x) {
131 CxHashKey key;
132 key.data = NULL;
133 key.len = 0;
134 key.hash = cx_hash_u32(x);
135 return key;
136 }
137
138 CxHashKey cx_hash_key_u64(uint64_t x) {
139 CxHashKey key;
140 key.data = NULL;
141 key.len = 0;
142 key.hash = cx_hash_u64(x);
143 return key;
144 }
145
146 int cx_hash_key_cmp(const CxHashKey *left, const CxHashKey *right) {
147 int d;
148 d = cx_vcmp_uint64(left->hash, right->hash);
149 if (d != 0) return d;
150 d = cx_vcmp_size(left->len, right->len);
151 if (d != 0) return d;
152 if (left->len == 0) return 0;
153 return memcmp(left->data, right->data, left->len);
154 }

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