stm32: Improvements to CAN bus ID generation. And added a small fast hash library (#3165)

Improved CAM bus ID generation, there were issues with ID collisions.
Added a small fast hash library.

Signed-off-by: Pontus Borg <liquidpontus@yahoo.se>

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/fast-hash/fasthash.h b/lib/fast-hash/fasthash.h
new file mode 100644
index 00000000..15ac2222
--- /dev/null
+++ b/lib/fast-hash/fasthash.h
@@ -0,0 +1,56 @@
+/* The MIT License
+
+   Copyright (C) 2012 Zilong Tan (eric.zltan@gmail.com)
+
+   Permission is hereby granted, free of charge, to any person
+   obtaining a copy of this software and associated documentation
+   files (the "Software"), to deal in the Software without
+   restriction, including without limitation the rights to use, copy,
+   modify, merge, publish, distribute, sublicense, and/or sell copies
+   of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be
+   included in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+   SOFTWARE.
+*/
+
+#ifndef _FASTHASH_H
+#define _FASTHASH_H
+
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * fasthash32 - 32-bit implementation of fasthash
+ * @buf:  data buffer
+ * @len:  data size
+ * @seed: the seed
+ */
+	uint32_t fasthash32(const void *buf, size_t len, uint32_t seed);
+
+/**
+ * fasthash64 - 64-bit implementation of fasthash
+ * @buf:  data buffer
+ * @len:  data size
+ * @seed: the seed
+ */
+	uint64_t fasthash64(const void *buf, size_t len, uint64_t seed);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif