From fa17765bd417ce7f9f7bd8f6dbae87f4e8609198 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Mon, 11 Dec 2023 12:03:29 +0100
Subject: crc: Add a CRC-24Q implementation

---
 cpukit/include/rtems/crc.h | 106 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 cpukit/include/rtems/crc.h

(limited to 'cpukit/include/rtems/crc.h')

diff --git a/cpukit/include/rtems/crc.h b/cpukit/include/rtems/crc.h
new file mode 100644
index 0000000000..1158dbcd7b
--- /dev/null
+++ b/cpukit/include/rtems/crc.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSImplCRC
+ *
+ * @brief This header file provides the interfaces of the
+ *   @ref RTEMSImplCRC.
+ */
+
+/*
+ * Copyright (C) 2024 embedded brains GmbH & Co. KG
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTEMS_CRC_H
+#define _RTEMS_CRC_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup RTEMSImplCRC Cyclic Redundancy Check (CRC) Support
+ *
+ * @ingroup RTEMSImpl
+ *
+ * @brief This group contains functions to calculate
+ *   Cyclic Redundancy Check (CRC) values.
+ *
+ * @{
+ */
+
+
+/**
+ * @brief This constant represents the default CRC-24Q seed state.
+ */
+#define CRC24Q_SEED 0U
+
+/**
+ * @brief This constant provides a mask to get a valid CRC-24Q value from the
+ *   integers returned by _CRC24Q_Update() and _CRC24Q_Sequence_update().
+ */
+#define CRC24Q_MASK 0xffffffU
+
+/**
+ * @brief Updates the CRC-24Q state using a byte.
+ *
+ * @param crc is the input CRC-24Q state.
+ *
+ * @param byte is the byte updating the input CRC-24Q state.
+ *
+ * @return Returns the updated CRC-24Q state.  Use the #CRC24Q_MASK to get a
+ *   valid CRC-24Q value.
+ */
+uint32_t _CRC24Q_Update( uint32_t crc, uint8_t byte );
+
+/**
+ * @brief Updates the CRC-24Q state using a sequence of bytes.
+ *
+ * @param crc is the input CRC-24Q state.
+ *
+ * @param bytes[in] is the sequence of bytes updating the input CRC-24Q state.
+ *
+ * @param size_in_bytes is the size in bytes of the byte sequence.
+ *
+ * @return Returns the updated CRC-24Q state.  Use the #CRC24Q_MASK to get a
+ *   valid CRC-24Q value.
+ */
+uint32_t _CRC24Q_Sequence_update(
+  uint32_t    crc,
+  const void *bytes,
+  size_t      size_in_bytes
+);
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _RTEMS_CRC_H */
-- 
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