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/* lzo1a_cr.ch -- literal run handling for the the LZO1A algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library 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.
The LZO library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the LZO package and is subject
to change.
*/
#ifndef __LZO1A_CR_H
#define __LZO1A_CR_H 1
/***********************************************************************
// code a literal run
************************************************************************/
static lzo_bytep
store_run(lzo_bytep const oo, const lzo_bytep const ii, lzo_uint r_len)
{
register lzo_bytep op;
register const lzo_bytep ip;
register lzo_uint t;
op = oo;
ip = ii;
assert(r_len > 0);
/* code a long R0 run */
if (r_len >= 512)
{
unsigned r_bits = 6; /* 256 << 6 == 16384 */
lzo_uint tt = 32768u;
while (r_len >= (t = tt))
{
r_len -= t;
*op++ = 0; *op++ = (R0MAX - R0MIN);
MEMCPY8_DS(op, ip, t);
LZO_STATS(lzo_stats->r0long_runs++);
}
tt >>= 1;
do {
if (r_len >= (t = tt))
{
r_len -= t;
*op++ = 0; *op++ = LZO_BYTE((R0FAST - R0MIN) + r_bits);
MEMCPY8_DS(op, ip, t);
LZO_STATS(lzo_stats->r0long_runs++);
}
tt >>= 1;
} while (--r_bits > 0);
}
assert(r_len < 512);
while (r_len >= (t = R0FAST))
{
r_len -= t;
*op++ = 0; *op++ = (R0FAST - R0MIN);
MEMCPY8_DS(op, ip, t);
LZO_STATS(lzo_stats->r0fast_runs++);
}
t = r_len;
if (t >= R0MIN)
{
/* code a short R0 run */
*op++ = 0; *op++ = LZO_BYTE(t - R0MIN);
MEMCPY_DS(op, ip, t);
LZO_STATS(lzo_stats->r0short_runs++);
}
else if (t > 0)
{
/* code a short literal run */
LZO_STATS(lzo_stats->lit_runs++);
LZO_STATS(lzo_stats->lit_run[t]++);
*op++ = LZO_BYTE(t);
MEMCPY_DS(op, ip, t);
}
return op;
}
#endif /* already included */
/*
vi:ts=4:et
*/
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