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Code Issues Wiki Activity

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
View file

@ -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);
}

5
src/main/common/crc.h
View file

@ -17,9 +17,12 @@
#pragma once
struct sbuf_s;
uint16_t crc16_ccitt(uint16_t crc, unsigned char a);
uint16_t crc16_ccitt_update(uint16_t crc, const void *data, uint32_t length);
uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a);
uint8_t crc8_dvb_s2_update(uint8_t crc, const void *data, uint32_t length);
struct sbuf_s;
void crc8_dvb_s2_sbuf_append(struct sbuf_s *dst, uint8_t *start);
uint8_t crc8_xor_update(uint8_t crc, const void *data, uint32_t length);
void crc8_xor_sbuf_append(struct sbuf_s *dst, uint8_t *start);

6
src/main/common/streambuf.c
View file

@ -61,6 +61,12 @@ void sbufWriteU32BigEndian(sbuf_t *dst, uint32_t val)
}
void sbufFill(sbuf_t *dst, uint8_t data, int len)
{
memset(dst->ptr, data, len);
dst->ptr += len;
}
void sbufWriteData(sbuf_t *dst, const void *data, int len)
{
memcpy(dst->ptr, data, len);

5
src/main/common/streambuf.h
View file

@ -20,19 +20,20 @@
#include <stdint.h>
// simple buffer-based serializer/deserializer without implicit size check
// little-endian encoding implemneted now
typedef struct sbuf_s {
uint8_t *ptr; // data pointer must be first (sbuff_t* is equivalent to uint8_t **)
uint8_t *ptr; // data pointer must be first (sbuf_t* is equivalent to uint8_t **)
uint8_t *end;
} sbuf_t;
sbuf_t *sbufInit(sbuf_t *sbuf, uint8_t *ptr, uint8_t *end);
void sbufWriteU8(sbuf_t *dst, uint8_t val);
void sbufWriteU16(sbuf_t *dst, uint16_t val);
void sbufWriteU32(sbuf_t *dst, uint32_t val);
void sbufWriteU16BigEndian(sbuf_t *dst, uint16_t val);
void sbufWriteU32BigEndian(sbuf_t *dst, uint32_t val);
void sbufFill(sbuf_t *dst, uint8_t data, int len);
void sbufWriteData(sbuf_t *dst, const void *data, int len);
void sbufWriteString(sbuf_t *dst, const char *string);
void sbufWriteStringWithZeroTerminator(sbuf_t *dst, const char *string);