devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

mi4: replace chksum_crc32 with crc_32r

Browse source 
This uses an equivalent algorithm but with a different initial value
than we normally use (all bits off vs all bits on). Use the new crc_32r
to replace the original MI4 crc32 implementation.

This frees up some extra space on mi4 targets which gives us more
room on a few very space constrained targets (sansa c200/e200, etc).

Change-Id: Iaaac3ae353b30566156b1404cbf31ca32926203d
This commit is contained in:
James Buren 2021-06-21 09:36:54 +00:00
parent fc92081080
commit 581081a3df
8 changed files with 6 additions and 147 deletions
Download patch file Download diff file Expand all files Collapse all files

25
firmware/include/crc32-mi4.h
View file

@ -1,25 +0,0 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: crc32.h 10464 2006-08-05 20:19:10Z miipekk $
*
* Copyright (C) 2007 Barry Wardell
*
* 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.
*
****************************************************************************/
#ifndef _CRC32_MI4_H
#define _CRC32_MI4_H
unsigned int chksum_crc32 (unsigned char *block, unsigned int length);
#endif