e26d0c62e0
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28413 a1c6a512-1295-4272-9138-f99709370657
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Original source:
|
|
* Copyright (c) 2003 by Joergen Ibsen / Jibz
|
|
*
|
|
* Rockbox adaptation:
|
|
* Copyright (c) 2010 by Marcin Bukat
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* CRC32 checksum
|
|
*
|
|
* Copyright (c) 1998-2003 by Joergen Ibsen / Jibz
|
|
* All Rights Reserved
|
|
*
|
|
* http://www.ibsensoftware.com/
|
|
*
|
|
* This software is provided 'as-is', without any express
|
|
* or implied warranty. In no event will the authors be
|
|
* held liable for any damages arising from the use of
|
|
* this software.
|
|
*
|
|
* Permission is granted to anyone to use this software
|
|
* for any purpose, including commercial applications,
|
|
* and to alter it and redistribute it freely, subject to
|
|
* the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be
|
|
* misrepresented; you must not claim that you
|
|
* wrote the original software. If you use this
|
|
* software in a product, an acknowledgment in
|
|
* the product documentation would be appreciated
|
|
* but is not required.
|
|
*
|
|
* 2. Altered source versions must be plainly marked
|
|
* as such, and must not be misrepresented as
|
|
* being the original software.
|
|
*
|
|
* 3. This notice may not be removed or altered from
|
|
* any source distribution.
|
|
*/
|
|
|
|
/*
|
|
* CRC32 algorithm taken from the zlib source, which is
|
|
* Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
|
|
*/
|
|
|
|
#include "tinf.h"
|
|
|
|
static const unsigned int tinf_crc32tab[16] = {
|
|
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190,
|
|
0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344,
|
|
0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278,
|
|
0xbdbdf21c
|
|
};
|
|
|
|
unsigned int tinf_crc32(const void *data, unsigned int length)
|
|
{
|
|
const unsigned char *buf = (const unsigned char *)data;
|
|
unsigned int crc = 0xffffffff;
|
|
unsigned int i;
|
|
|
|
if (length == 0) return 0;
|
|
|
|
for (i = 0; i < length; ++i)
|
|
{
|
|
crc ^= buf[i];
|
|
crc = tinf_crc32tab[crc & 0x0f] ^ (crc >> 4);
|
|
crc = tinf_crc32tab[crc & 0x0f] ^ (crc >> 4);
|
|
}
|
|
|
|
return crc ^ 0xffffffff;
|
|
}
|