save failed integration state

gomspace/libutil/include/gs/util/fletcher.h

@@ -0,0 +1,89 @@
+#ifndef GS_UTIL_FLETCHER_H
+#define GS_UTIL_FLETCHER_H
+/* Copyright (c) 2013-2017 GomSpace A/S. All rights reserved. */
+/**
+   @file
+
+   Fletcher16 checksum,
+*/
+
+#include <gs/util/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+   Fletcher16 checksum (read using copy function).
+
+   Data is read from \a data, using the specified \a memcpyfcn function.
+
+   @param[in] data data.
+   @param[in] size number of \a data bytes.
+   @param[in] memcpyfcn memory copy function. If NULL is specified, standard memcpy will be used.
+   @returns fletcher16 checksum
+*/
+uint16_t gs_fletcher16_memcpy(const void * data, size_t size, void * (*memcpyfcn)(void *, const void *, size_t));
+
+/**
+   Fletcher16 checksum (read from program memory).
+
+   AVR8: reads from program memory.
+   Other architectures: identical to gs_fletcher16().
+
+   @param[in] data_in data.
+   @param[in] size number of \a data bytes.
+   @returns fletcher16 checksum
+*/
+uint16_t gs_fletcher16_P(const void * data_in, size_t size);
+
+/**
+   Fletcher16 checksum.
+
+   @param[in] data data.
+   @param[in] size number of \a data bytes.
+   @returns fletcher16 checksum
+*/
+uint16_t gs_fletcher16(const void * data, size_t size);
+
+/**
+   Fletcher16 working set.
+   @see gs_fletcher16_init(), gs_fletcher16_update(), gs_fletcher16_finalize()
+*/
+typedef struct {
+    /**
+       Sum1 - internal.
+    */
+    uint16_t sum1;
+    /**
+       Sum2 - internal.
+    */
+    uint16_t sum2;
+} gs_fletcher16_t;
+
+/**
+   Initialize fletcher16 working set.
+   @param[in] f16 working set.
+*/
+void gs_fletcher16_init(gs_fletcher16_t * f16);
+
+/**
+   Update fletcher16 checksum.
+   @param[in] f16 working set.
+   @param[in] data data.
+   @param[in] size number of \a data bytes.
+*/
+void gs_fletcher16_update(gs_fletcher16_t * f16, const void * data, size_t size);
+
+/**
+   Finalize fletcher16 checksum and return it.
+
+   @param[in] f16 working set.
+   @returns fletcher16 checksum
+*/
+uint16_t gs_fletcher16_finalize(gs_fletcher16_t * f16);
+    
+#ifdef __cplusplus
+}
+#endif
+#endif