54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
#ifndef TASK01_QUEUE_MODEL_H
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#define TASK01_QUEUE_MODEL_H
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#include <stddef.h>
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#include <stdint.h>
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typedef struct QueueMessage
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{
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uint32_t sequence;
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uint32_t payload;
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uint32_t checksum;
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} QueueMessage;
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typedef struct QueueEvidence
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{
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uint32_t sequence;
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uint32_t event;
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uint32_t tick;
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uint32_t actor;
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uint32_t value;
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uint32_t committed;
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} QueueEvidence;
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static inline uint32_t fc05_message_checksum( uint32_t sequence,
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uint32_t payload )
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{
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return 0x51000000U ^ sequence ^ payload;
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}
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static inline int fc05_message_is_valid( const QueueMessage * message )
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{
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return message != NULL &&
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message->checksum ==
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fc05_message_checksum( message->sequence, message->payload );
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}
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static inline uint32_t fc05_digest( const QueueEvidence * events,
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size_t count )
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{
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uint32_t hash = 2166136261U;
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size_t index;
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for( index = 0U; index < count; ++index )
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{
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hash = ( hash ^ events[ index ].event ) * 16777619U;
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hash = ( hash ^ events[ index ].actor ) * 16777619U;
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hash = ( hash ^ events[ index ].value ) * 16777619U;
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hash = ( hash ^ events[ index ].committed ) * 16777619U;
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}
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return hash;
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}
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#endif
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