Move crc16.[ch] to shared

shared/crc16.c

@@ -0,0 +1,35 @@
+#include "crc16.h"
+
+void crc16_init(crc16_data_t *crc16Config)
+{
+    crc16Config->currentCrc = 0;
+}
+
+void crc16_update(crc16_data_t *crc16Config, const uint8_t *src, uint32_t lengthInBytes)
+{
+    uint32_t crc = crc16Config->currentCrc;
+
+    uint32_t j;
+    for (j = 0; j < lengthInBytes; ++j)
+    {
+        uint32_t i;
+        uint32_t byte = src[j];
+        crc ^= byte << 8;
+        for (i = 0; i < 8; ++i)
+        {
+            uint32_t temp = crc << 1;
+            if (crc & 0x8000)
+            {
+                temp ^= 0x1021;
+            }
+            crc = temp;
+        }
+    }
+
+    crc16Config->currentCrc = crc;
+}
+
+void crc16_finalize(crc16_data_t *crc16Config, uint16_t *hash)
+{
+    *hash = crc16Config->currentCrc;
+}

shared/crc16.h

@@ -0,0 +1,25 @@
+#ifndef __CRC16_H__
+#define __CRC16_H__
+
+#include <stdint.h>
+
+typedef struct Crc16Data {
+    uint16_t currentCrc;
+} crc16_data_t;
+
+//! @brief Initializes the parameters of the crc function, must be called first.
+//! @param crc16Config Instantiation of the data structure of type crc16_data_t.
+void crc16_init(crc16_data_t *crc16Config);
+
+//! @brief A "running" crc calculator that updates the crc value after each call.
+//! @param crc16Config Instantiation of the data structure of type crc16_data_t.
+//! @param src Pointer to the source buffer of data.
+//! @param lengthInBytes The length, given in bytes (not words or long-words).
+void crc16_update(crc16_data_t *crc16Config, const uint8_t *src, uint32_t lengthInBytes);
+
+//! @brief Calculates the final crc value, padding with zeros if necessary, must be called last.
+//! @param crc16Config Instantiation of the data structure of type crc16_data_t.
+//! @param hash Pointer to the value returned for the final calculated crc value.
+void crc16_finalize(crc16_data_t *crc16Config, uint16_t *hash);
+
+#endif