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Added some sbuf utility functions

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This commit is contained in:
Martin Budden 2017-09-04 09:01:31 +01:00
parent 067f61f834
commit 81c1153533
4 changed files with 35 additions and 3 deletions
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22
src/main/common/crc.c
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@ -77,3 +77,25 @@ void crc8_dvb_s2_sbuf_append(sbuf_t *dst, uint8_t *start)
}
sbufWriteU8(dst, crc);
}
uint8_t crc8_xor_update(uint8_t crc, const void *data, uint32_t length)
{
const uint8_t *p = (const uint8_t *)data;
const uint8_t *pend = p + length;
for (; p != pend; p++) {
crc ^= *p;
}
return crc;
}
void crc8_xor_sbuf_append(sbuf_t *dst, uint8_t *start)
{
uint8_t crc = 0;
const uint8_t *end = dst->ptr;
for (uint8_t *ptr = start; ptr < end; ++ptr) {
crc ^= *ptr;
}
sbufWriteU8(dst, crc);
}