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added update() helper

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This commit is contained in:
Ahmet Inan 2018-07-29 10:50:30 +02:00
commit 479f5e0220
1 changed files with 7 additions and 3 deletions
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10
crc.hh
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@ -15,13 +15,18 @@ class CRC
TYPE lut[256];
TYPE poly;
TYPE crc;
TYPE update(TYPE prev, bool data)
{
TYPE tmp = prev ^ data;
return (prev >> 1) ^ ((tmp & 1) * poly);
}
public:
CRC(TYPE poly, TYPE crc = 0) : poly(poly), crc(crc)
{
for (int j = 0; j < 256; ++j) {
TYPE tmp = j;
for (int i = 8; i; --i)
tmp = (tmp >> 1) ^ ((tmp & 1) * poly);
tmp = update(tmp, 0);
lut[j] = tmp;
}
}
@ -35,8 +40,7 @@ public:
}
TYPE operator()(bool data)
{
TYPE tmp = crc ^ data;
return crc = (crc >> 1) ^ ((tmp & 1) * poly);
return crc = update(crc, data);
}
TYPE operator()(uint8_t data)
{