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LibCrypto: Implement a generic 16-bit CRC

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This is mostly a 16-bit version of the 8-bit CRC, using the same general
byte-LUT algorithm.
This commit is contained in:
kleines Filmröllchen 2023-06-30 20:03:42 +02:00 • committed by Andrew Kaster
parent ae039977d1
commit fb37587efe
2 changed files with 91 additions and 0 deletions
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9
AK/Endian.h
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@ -129,10 +129,19 @@ struct Traits<BigEndian<T>> : public GenericTraits<BigEndian<T>> {
static constexpr bool is_trivially_serializable() { return Traits<T>::is_trivially_serializable(); }
};
constexpr u16 bitswap(u16 v)
{
v = ((v >> 1) & 0x5555) | ((v & 0x5555) << 1); // even & odd bits
v = ((v >> 2) & 0x3333) | ((v & 0x3333) << 2); // pairs
v = ((v >> 4) & 0x0F0F) | ((v & 0x0F0F) << 4); // nibbles
return ((v >> 8) & 0x00FF) | ((v & 0x00FF) << 8); // bytes
}
}
#if USING_AK_GLOBALLY
using AK::BigEndian;
using AK::bitswap;
using AK::LittleEndian;
using AK::NetworkOrdered;
#endif