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//
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//
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// Copyright 2011 TheSeven
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//
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//
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// This file is part of emCORE.
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//
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// emCORE 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 2 of the
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// License, or (at your option) any later version.
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//
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// emCORE 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.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with emCORE. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "global.h"
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#include "crc32.h"
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static const unsigned int crc32tab[16] =
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{
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0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
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0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
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};
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uint32_t crc32(const void* data, size_t length)
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{
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const uint8_t* buf = (const uint8_t *)data;
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unsigned int crc = 0xffffffff;
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while (length--)
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{
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crc ^= *buf++;
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crc = crc32tab[crc & 0xf] ^ (crc >> 4);
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crc = crc32tab[crc & 0xf] ^ (crc >> 4);
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}
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return crc ^ 0xffffffff;
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}
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