4 * Copyright (c) 1998-2003 by Joergen Ibsen / Jibz
7 * http://www.ibsensoftware.com/
9 * This software is provided 'as-is', without any express
10 * or implied warranty. In no event will the authors be
11 * held liable for any damages arising from the use of
14 * Permission is granted to anyone to use this software
15 * for any purpose, including commercial applications,
16 * and to alter it and redistribute it freely, subject to
17 * the following restrictions:
19 * 1. The origin of this software must not be
20 * misrepresented; you must not claim that you
21 * wrote the original software. If you use this
22 * software in a product, an acknowledgment in
23 * the product documentation would be appreciated
24 * but is not required.
26 * 2. Altered source versions must be plainly marked
27 * as such, and must not be misrepresented as
28 * being the original software.
30 * 3. This notice may not be removed or altered from
31 * any source distribution.
35 * CRC32 algorithm taken from the zlib source, which is
36 * Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
41 static const unsigned int tinf_crc32tab[16] = {
42 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190,
43 0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344,
44 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278,
48 unsigned int tinf_crc32(const void *data, unsigned int length)
50 const unsigned char *buf = (const unsigned char *)data;
51 unsigned int crc = 0xffffffff;
54 if (length == 0) return 0;
56 for (i = 0; i < length; ++i)
59 crc = tinf_crc32tab[crc & 0x0f] ^ (crc >> 4);
60 crc = tinf_crc32tab[crc & 0x0f] ^ (crc >> 4);
63 return crc ^ 0xffffffff;