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Add stateful decoders, which makes formats like the FB-100 much easier to work

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with. Add a generic CRC tool allowing all the parameters to be set (currently
unused).
This commit is contained in:
David Given
2019-04-12 00:13:56 +02:00
parent 9c6fe1bafa
commit 84076674fd
9 changed files with 161 additions and 46 deletions
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17
lib/crc.h
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@@ -6,14 +6,29 @@
#define MODBUS_POLY_REF 0xa001
#define BROTHER_POLY 0x000201
struct crcspec
{
unsigned width;
uint64_t poly;
uint64_t init;
uint64_t xorout;
bool refin;
bool refout;
};
extern uint64_t generic_crc(const struct crcspec& spec, const Bytes& bytes);
extern uint16_t sumBytes(const Bytes& bytes);
extern uint8_t xorBytes(const Bytes& bytes);
extern uint16_t crc16(uint16_t poly, uint16_t init, const Bytes& bytes);
extern uint16_t crc16ref(uint16_t poly, const Bytes& bytes);
extern uint16_t crc16ref(uint16_t poly, uint16_t init, const Bytes& bytes);
extern uint32_t crcbrother(const Bytes& bytes);
static inline uint16_t crc16(uint16_t poly, const Bytes& bytes)
{ return crc16(poly, 0xffff, bytes); }
static inline uint16_t crc16ref(uint16_t poly, const Bytes& bytes)
{ return crc16ref(poly, 0xffff, bytes); }
#endif