Add a variant of the hash funciton for arbitrary data.

Mesa was using this for hashing various key structures.

2 files changed, 16 insertions, 0 deletions

diff --git a/fnv_hash.c b/fnv_hash.c
index 870dc0d..99801ce 100644
--- a/fnv_hash.c
+++ b/fnv_hash.c
@@ -50,6 +50,21 @@ fnv1_hash_string(const char *key)
 	return hash;
 }
 
+uint32_t
+fnv1_hash_data(const void *data, size_t size)
+{
+	uint32_t hash = 2166136261ul;
+	const uint8_t *bytes = (uint8_t *)data;
+
+	while (size-- != 0) {
+		hash ^= *bytes;
+		hash = hash * 0x01000193;
+		bytes++;
+	}
+
+	return hash;
+}
+
 int
 string_key_equals(const void *a, const void *b)
 {
diff --git a/fnv_hash.h b/fnv_hash.h
index 12ced2d..eb98205 100644
--- a/fnv_hash.h
+++ b/fnv_hash.h
@@ -31,4 +31,5 @@
 #include <inttypes.h>
 
 uint32_t fnv1_hash_string(const char *key);
+uint32_t fnv1_hash_data(const void *data, size_t size);
 int string_key_equals(const void *a, const void *b);