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add: fast reverse 16bit

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This commit is contained in:
iceman1001 2018-01-27 23:16:35 +01:00
commit e396575424
4 changed files with 27 additions and 6 deletions
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8
common/crc.c
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@ -105,7 +105,7 @@ uint32_t CRC8Mad(uint8_t *buff, size_t size) {
crc_init_ref(&crc, 8, 0x1d, 0xe3, 0, true, true);
for ( int i = 0; i < size; ++i)
crc_update2(&crc, buff[i], 8);
return reflect(crc_finish(&crc), 8);
return reflect8(crc_finish(&crc));
}
// width=4 poly=0xC, reversed poly=0x7 init=0x5 refin=true refout=true xorout=0x0000 check= name="CRC-4/LEGIC"
uint32_t CRC4Legic(uint8_t *cmd, size_t size) {
@ -123,7 +123,7 @@ uint32_t CRC8Legic(uint8_t *buff, size_t size) {
crc_init_ref(&crc, 8, 0x63, 0x55, 0, true, true);
for ( int i = 0; i < size; ++i)
crc_update2(&crc, buff[i], 8);
return reflect(crc_finish(&crc), 8);
return reflect8(crc_finish(&crc));
}
// This CRC-16 is used in Legic Advant systems.
@ -138,7 +138,7 @@ uint32_t CRC16Legic(uint8_t *buff, size_t size, uint8_t uidcrc) {
crc_init_ref(&crc, 16, CRC16_POLY_LEGIC, initial, 0, true, true);
for ( int i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return reflect(crc_finish(&crc), 16);
return reflect16(crc_finish(&crc));
}
//w=16 poly=0x3d65 init=0x0000 refin=true refout=true xorout=0xffff check=0xea82 name="CRC-16/DNP"
@ -165,7 +165,7 @@ uint32_t CRC16_Iso15693(uint8_t *buff, size_t size) {
crc_init_ref(&crc, 16, 0x8408, 0xFFFF, 0xFFFF, true, false);
for ( int i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return reflect(crc_finish(&crc), 16);
return reflect16(crc_finish(&crc));
}
//width=16 poly=0x8408 init=0xffff refin=true refout=true xorout=0x0BC3 check=0xF0B8 name="CRC-16/ICLASS"
uint32_t CRC16_ICLASS(uint8_t *buff, size_t size) {

1
common/iso15693tools.c
View file

@ -28,7 +28,6 @@ uint16_t Iso15693Crc(uint8_t *v, int n)
}
}
}
return ~(uint16_t)(reg & 0xffff);
}