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15 lines
543 B
C++
15 lines
543 B
C++
#include <net/net.hpp>
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uint16_t CalculateChecksum(uint16_t *Data, uint64_t Length)
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{
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uint16_t *Data16 = (uint16_t *)Data;
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uint64_t Checksum = 0;
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for (uint64_t i = 0; i < Length / 2; i++)
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Checksum += ((Data16[i] & 0xFF00) >> 8) | ((Data16[i] & 0x00FF) << 8);
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if (Length % 2)
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Checksum += ((uint16_t)((char *)Data16)[Length - 1]) << 8;
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while (Checksum & 0xFFFF0000)
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Checksum = (Checksum & 0xFFFF) + (Checksum >> 16);
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return (uint16_t)(((~Checksum & 0xFF00) >> 8) | ((~Checksum & 0x00FF) << 8));
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}
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