initial commit

c/word-count/src/hash.h

@@ -0,0 +1,52 @@
+#ifndef _HASH_H
+#define _HASH_H
+
+#include <stdbool.h>
+
+typedef struct h_entry {
+    void *data;
+    int key_len;
+    struct h_entry *prev, *next;
+} h_entry_t;
+
+typedef struct {
+    int size;
+    h_entry_t *entries[];
+} hash_t;
+
+/* a few predefined hash sizes */
+typedef struct {
+    int size;
+    h_entry_t *entries[16];
+} hash_16_t;
+
+typedef struct {
+    int size;
+    h_entry_t *entries[128];
+} hash_128_t;
+
+typedef struct {
+    int size;
+    h_entry_t *entries[1024];
+} hash_1024_t;
+
+#define ENTRY_ALLOC_SIZE 20
+
+/* hash map functions */
+hash_t *h_create(int size);
+void h_init(hash_t *);
+void h_destroy(hash_t *);
+
+/* static free_nodes */
+void set_pool_free_static(h_entry_t *p);
+
+/* hash entries functions */
+h_entry_t *h_entry_add(hash_t *, const unsigned char *, const int, int *);
+h_entry_t *h_entry_find(hash_t *, const unsigned char *, const int);
+void h_entry_free(h_entry_t *);
+
+
+/* hash function */
+unsigned long hash_djb2(const unsigned char *str, const int len);
+
+#endif