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Small optimisation of the CRC calculations.

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This commit is contained in:
Jonathan Naylor
2018-02-05 21:21:08 +00:00
parent bdc35d02bd
commit d2504172f9
1 changed files with 1 additions and 4 deletions
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5
NXDNCRC.cpp
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@@ -142,13 +142,12 @@ uint8_t CNXDNCRC::createCRC6(const unsigned char* in, unsigned int length)
bool bit2 = (crc & 0x20U) == 0x20U;
crc <<= 1;
crc &= 0x3EU;
if (bit1 ^ bit2)
crc ^= 0x27U;
}
return crc;
return crc & 0x3FU;
}
uint16_t CNXDNCRC::createCRC12(const unsigned char* in, unsigned int length)
@@ -160,7 +159,6 @@ uint16_t CNXDNCRC::createCRC12(const unsigned char* in, unsigned int length)
bool bit2 = (crc & 0x0800U) == 0x0800U;
crc <<= 1;
crc &= 0x0FFEU;
if (bit1 ^ bit2)
crc ^= 0x080FU;
@@ -178,7 +176,6 @@ uint16_t CNXDNCRC::createCRC15(const unsigned char* in, unsigned int length)
bool bit2 = (crc & 0x4000U) == 0x4000U;
crc <<= 1;
crc &= 0x7FFEU;
if (bit1 ^ bit2)
crc ^= 0x4CC5U;