testing hash

hash_testing/src/joaat/hash.c

@@ -0,0 +1,46 @@
+#include "hash.h"
+
+#include <stddef.h>
+
+#define JOAAT_SEED 0x9e3779b9u
+
+uint32_t joaat_hash_bytes(const void *data, size_t len)
+{
+    uint32_t hash = JOAAT_SEED;
+    const unsigned char *p = (const unsigned char *)data;
+
+    while (len-- > 0) {
+        hash += *p++;
+        hash += (hash << 10);
+        hash ^= (hash >> 6);
+    }
+
+    hash += (hash << 3);
+    hash ^= (hash >> 11);
+    hash += (hash << 15);
+
+    return hash;
+}
+
+uint32_t joaat_hash(const char *str)
+{
+    uint32_t hash = JOAAT_SEED;
+    const unsigned char *p = (const unsigned char *)str;
+
+    while (*p) {
+        hash += *p++;
+        hash += (hash << 10);
+        hash ^= (hash >> 6);
+    }
+
+    hash += (hash << 3);
+    hash ^= (hash >> 11);
+    hash += (hash << 15);
+
+    return hash;
+}
+
+unsigned int hash(const char *str)
+{
+    return (unsigned int)joaat_hash(str);
+}

hash_testing/src/joaat/hash.h

@@ -0,0 +1,21 @@
+#ifndef ARSV_JOAAT_HASH_H
+#define ARSV_JOAAT_HASH_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+uint32_t joaat_hash(const char *str);
+uint32_t joaat_hash_bytes(const void *data, size_t len);
+
+/* Compatibility wrapper matching the original set.c function name. */
+unsigned int hash(const char *str);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ARSV_JOAAT_HASH_H */