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32 lines
1.2 KiB
C++
32 lines
1.2 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <net/net.hpp>
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uint16_t CalculateChecksum(uint16_t *Data, size_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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