X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fpearson.c;fp=src%2Fpearson.c;h=a39c8952ea86032f3260db9951b82f77c93321e2;hb=4521c1e7ae5371ab9d639adc617d17fb4e8ded0c;hp=0000000000000000000000000000000000000000;hpb=63682b4da9d3e892d1d0a671de860adc43068142;p=src%2Fapp-framework-binder.git

diff --git a/src/pearson.c b/src/pearson.c
new file mode 100644
index 00000000..a39c8952
--- /dev/null
+++ b/src/pearson.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+/*
+ * Returns a tiny hash value for the 'text'.
+ *
+ * Tiny hash function inspired from pearson
+ */
+uint8_t pearson4(const char *text)
+{
+	static uint8_t T[16] = {
+		 4,  1,  6,  0,  9, 14, 11,  5,
+		 2,  3, 12, 15, 10,  7,  8, 13
+	};
+	uint8_t r, c;
+
+	for (r = 0; (c = (uint8_t)*text) ; text++) {
+		r = T[r ^ (15 & c)];
+		r = T[r ^ (c >> 4)];
+	}
+	return r; // % HEADCOUNT;
+}
+