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remove some changes in crc.h

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This commit is contained in:
merlokk 2019-03-18 15:19:57 +02:00
commit a77f689e7f
2 changed files with 0 additions and 25 deletions
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22
common/crc.c
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@ -26,13 +26,10 @@ uint32_t reflect(uint32_t v, int b) {
void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor) void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor)
{ {
crc->order = order; crc->order = order;
crc->topbit = BITMASK(order - 1);
crc->polynom = polynom; crc->polynom = polynom;
crc->initial_value = initial_value; crc->initial_value = initial_value;
crc->final_xor = final_xor; crc->final_xor = final_xor;
crc->mask = (1L<<order)-1; crc->mask = (1L<<order)-1;
crc->refin = false;
crc->refout = false;
crc_clear(crc); crc_clear(crc);
} }
@ -49,28 +46,9 @@ void crc_update(crc_t *crc, uint32_t data, int data_width)
} }
} }
void crc_update2(crc_t *crc, uint32_t data, int data_width) {
if (crc->refin)
data = reflect(data, data_width);
// Bring the next byte into the remainder.
crc->state ^= data << (crc->order - data_width);
for (uint8_t bit = data_width; bit > 0; --bit) {
if (crc->state & crc->topbit)
crc->state = (crc->state << 1) ^ crc->polynom;
else
crc->state = (crc->state << 1);
}
}
void crc_clear(crc_t *crc) void crc_clear(crc_t *crc)
{ {
crc->state = crc->initial_value & crc->mask; crc->state = crc->initial_value & crc->mask;
if (crc->refin)
crc->state = reflect(crc->state, crc->order);
} }
uint32_t crc_finish(crc_t *crc) uint32_t crc_finish(crc_t *crc)

3
common/crc.h
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@ -20,9 +20,6 @@ typedef struct crc {
uint32_t initial_value; uint32_t initial_value;
uint32_t final_xor; uint32_t final_xor;
uint32_t mask; uint32_t mask;
int topbit;
bool refin; /* Parameter: Reflect input bytes? */
bool refout; /* Parameter: Reflect output CRC? */
} crc_t; } crc_t;
/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32 /* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32