2 files changed, 82 insertions, 1 deletions
diff --git a/zix/common.h b/zix/common.h
index 2107df5..a7edf76 100644
--- a/zix/common.h
+++ b/zix/common.h
@@ -17,6 +17,8 @@
 #ifndef ZIX_COMMON_H
 #define ZIX_COMMON_H
 
+#include <stdbool.h>
+
 /**
    @addtogroup zix
    @{
@@ -55,7 +57,11 @@ typedef enum {
 typedef int (*ZixComparator)(const void* a, const void* b, void* user_data);
 
 /**
-   @}
+   Function for testing equality of two elements.
+*/
+typedef bool (*ZixEqualFunc)(const void* a, const void* b);
+   
+/**@}
 */
 
 #endif  /* ZIX_COMMON_H */
diff --git a/zix/hash.h b/zix/hash.h
new file mode 100644
index 0000000..44521f1
--- /dev/null
+++ b/zix/hash.h
@@ -0,0 +1,75 @@
+/*
+  Copyright 2011 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef ZIX_HASH_H
+#define ZIX_HASH_H
+
+#include "zix/common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct ZixHashImpl ZixHash;
+
+/**
+   Function for computing the hash of an element.
+*/
+typedef unsigned (*ZixHashFunc)(const void* key);
+
+ZIX_API
+ZixHash*
+zix_hash_new(ZixHashFunc  hash_func,
+             ZixEqualFunc key_equal_func);
+
+ZIX_API
+void
+zix_hash_free(ZixHash* hash);
+
+ZIX_API
+unsigned
+zix_string_hash(const void* key);
+
+ZIX_API
+bool
+zix_string_equal(const void* a, const void* b);
+
+ZIX_API
+ZixStatus
+zix_hash_insert(ZixHash*    hash,
+                const void* key,
+                void*       data);
+
+ZIX_API
+ZixStatus
+zix_hash_remove(ZixHash* hash, const void* key);
+
+ZIX_API
+void*
+zix_hash_find(const ZixHash* hash,
+              const void*    key);
+
+ZIX_API
+void
+zix_hash_foreach(const ZixHash* hash,
+                 void (*f)(const void* key, void* value, void* user_data),
+                 void* user_data);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* ZIX_HASH_H */