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/* lzo1b_c.ch -- implementation of the LZO1B compression algorithm
This file is part of the LZO real-time data compression library.
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/
*/
/***********************************************************************
//
************************************************************************/
#if !defined(LZO_HAVE_R1) && !defined(LZO_NO_R1)
# define LZO_HAVE_R1
#endif
#if !defined(LZO_HAVE_M3) && !defined(LZO_NO_M3)
# if (M3O_BITS < 8)
# define LZO_HAVE_M3
# endif
#endif
#define MI
#define SI MI
#if (DD_BITS > 0)
#define DI ++ii; DVAL_NEXT(dv,ii); UPDATE_D(dict,drun,dv,ii,in); MI
#define XI assert(ii < ip); ii = ip; DVAL_FIRST(dv,(ip));
#else
#define DI ++ii; DINDEX1(dindex,ii); UPDATE_I(dict,0,dindex,ii,in); MI
#define XI assert(ii < ip); ii = ip;
#endif
/***********************************************************************
// compress a block of data.
//
// I really apologize for this spaghetti code.
************************************************************************/
LZO_PRIVATE(int)
do_compress ( const lzo_bytep in , lzo_uint in_len,
lzo_bytep out, lzo_uintp out_len,
lzo_voidp wrkmem )
{
register const lzo_bytep ip;
#if (DD_BITS > 0)
#if defined(__LZO_HASH_INCREMENTAL)
lzo_xint dv;
#endif
unsigned drun = 0;
#endif
lzo_bytep op;
const lzo_bytep const in_end = in + in_len;
const lzo_bytep const ip_end = in + in_len - MIN_LOOKAHEAD;
const lzo_bytep ii;
#if defined(LZO_HAVE_R1)
const lzo_bytep r1 = ip_end; /* pointer for R1 match (none yet) */
#endif
#if defined(LZO_HAVE_M3)
lzo_bytep m3 = out + 1; /* pointer after last m3/m4 match */
#endif
lzo_dict_p const dict = (lzo_dict_p) wrkmem;
#if defined(LZO_COLLECT_STATS)
lzo_stats->r_bits = R_BITS;
lzo_stats->m3o_bits = M3O_BITS;
lzo_stats->dd_bits = DD_BITS;
lzo_stats->clevel = CLEVEL;
lzo_stats->d_bits = D_BITS;
lzo_stats->min_lookahead = MIN_LOOKAHEAD;
lzo_stats->max_lookbehind = MAX_LOOKBEHIND;
lzo_stats->compress_id = LZO_CPP_MACRO_EXPAND(COMPRESS_ID);
#endif
/* init dictionary */
#if defined(LZO_DETERMINISTIC)
BZERO8_PTR(wrkmem,sizeof(lzo_dict_t),D_SIZE);
#endif
op = out;
ip = in;
ii = ip; /* point to start of current literal run */
#if (DD_BITS > 0)
DVAL_FIRST(dv,ip);
UPDATE_D(dict,drun,dv,ip,in);
ip++;
DVAL_NEXT(dv,ip);
#else
ip++;
#endif
assert(ip < ip_end);
for (;;)
{
const lzo_bytep m_pos;
#if !defined(NDEBUG)
const lzo_bytep m_pos_sav = NULL;
#endif
lzo_uint m_off;
#if (DD_BITS == 0)
lzo_uint dindex;
#endif
lzo_uint m_len;
/***********************************************************************
// search for a match
************************************************************************/
#if !defined(LZO_SEARCH_MATCH_INCLUDE_FILE)
# define LZO_SEARCH_MATCH_INCLUDE_FILE "lzo1b_sm.ch"
#endif
#include LZO_SEARCH_MATCH_INCLUDE_FILE
#if !defined(LZO_TEST_MATCH_INCLUDE_FILE)
# define LZO_TEST_MATCH_INCLUDE_FILE "lzo1b_tm.ch"
#endif
#include LZO_TEST_MATCH_INCLUDE_FILE
/***********************************************************************
// found a literal
************************************************************************/
/* a literal */
literal:
#if (DD_BITS == 0)
UPDATE_I(dict,0,dindex,ip,in);
#endif
if (++ip >= ip_end)
break;
#if (DD_BITS > 0)
DVAL_NEXT(dv,ip);
#endif
continue;
/***********************************************************************
// found a match
************************************************************************/
match:
#if (DD_BITS == 0)
UPDATE_I(dict,0,dindex,ip,in);
#endif
/* we have found a match of at least M2_MIN_LEN */
#if !defined(LZO_CODE_RUN_INCLUDE_FILE)
# define LZO_CODE_RUN_INCLUDE_FILE "lzo1b_cr.ch"
#endif
#include LZO_CODE_RUN_INCLUDE_FILE
/* ii now points to the start of the current match */
assert(ii == ip);
/***********************************************************************
// code the match
************************************************************************/
#if !defined(LZO_CODE_MATCH_INCLUDE_FILE)
# define LZO_CODE_MATCH_INCLUDE_FILE "lzo1b_cm.ch"
#endif
#include LZO_CODE_MATCH_INCLUDE_FILE
/* ii now points to the start of the next literal run */
assert(ii == ip);
}
/***********************************************************************
// end of block
************************************************************************/
assert(ip <= in_end);
#if defined(LZO_COLLECT_STATS)
{
lzo_uint i;
const lzo_bytep p;
for (i = 0; i < D_SIZE; i++)
{
p = dict[i];
if (BOUNDS_CHECKING_OFF_IN_EXPR(p == NULL || p < in || p > in_end))
lzo_stats->unused_dict_entries++;
}
lzo_stats->unused_dict_entries_percent =
100.0 * lzo_stats->unused_dict_entries / D_SIZE;
}
#endif
#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
/* return if op == out to indicate that we
* couldn't compress and didn't copy anything.
*/
if (op == out)
{
*out_len = 0;
return LZO_E_NOT_COMPRESSIBLE;
}
#endif
/* store the final literal run */
if (pd(in_end,ii) > 0)
{
lzo_uint t = pd(in_end,ii);
op = STORE_RUN(op,ii,t);
}
*out_len = pd(op, out);
return LZO_E_OK; /* compression went ok */
}
/*
vi:ts=4:et
*/
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