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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) 1996-2014 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 1
-#endif
-
-#if !defined(LZO_HAVE_M3) && !defined(LZO_NO_M3)
-# if (M3O_BITS < 8)
-# define LZO_HAVE_M3 1
-# endif
-#endif
-
-
-#define MI /*empty*/
-#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.
-************************************************************************/
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-LZO_PRIVATE(int)
-do_compress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- 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 (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_PP_MACRO_EXPAND(COMPRESS_ID);
-#endif
-
- /* init dictionary */
-#if (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_DEFINE_UNINITIALIZED_VAR(lzo_uint, m_off, 0);
-#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 (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 */
-}
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-
-/*
-vi:ts=4:et
-*/
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