/* lzo1b_cc.c -- LZO1B compression internal entry point

   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/

 */

#define LZO_NEED_DICT_H 1

#include "config1b.h"

/***********************************************************************

// compression internal entry point.

************************************************************************/

int _lzo1b_do_compress   ( const lzo_bytep in,  lzo_uint  in_len,

                                 lzo_bytep out, lzo_uintp out_len,

                                 lzo_voidp wrkmem,

                                 lzo_compress_t func )

{

    int r;

#if defined(LZO_TEST_COMPRESS_OVERRUN)

    lzo_uint avail_out = *out_len;

#endif

#if (LZO_COLLECT_STATS)

    _lzo1b_stats_init(lzo_stats);

    lzo_stats->in_len = in_len;

#endif

    /* don't try to compress a block that's too short */

    if (in_len == 0)

    {

        *out_len = 0;

        r = LZO_E_OK;

    }

    else if (in_len <= MIN_LOOKAHEAD + 1)

    {

#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)

        *out_len = 0;

        r = LZO_E_NOT_COMPRESSIBLE;

#else

        *out_len = pd(STORE_RUN(out,in,in_len), out);

        r = (*out_len > in_len) ? LZO_E_OK : LZO_E_ERROR;

#endif

    }

    else

        r = func(in,in_len,out,out_len,wrkmem);

#if defined(LZO_EOF_CODE)

#if defined(LZO_TEST_COMPRESS_OVERRUN)

    if (r == LZO_E_OK && avail_out - *out_len < 3)

        r = LZO_E_COMPRESS_OVERRUN;

#endif

    if (r == LZO_E_OK)

    {

        lzo_bytep op = out + *out_len;

        op[0] = M3_MARKER | 1;

        op[1] = 0;

        op[2] = 0;

        *out_len += 3;

    }

#endif

#if (LZO_COLLECT_STATS)

    lzo_stats->out_len = *out_len;

    lzo_stats->match_bytes =

       1 * lzo_stats->m1_matches + 2 * lzo_stats->m2_matches +

       3 * lzo_stats->m3_matches + 4 * lzo_stats->m4_matches;

    _lzo1b_stats_calc(lzo_stats);

#endif

    return r;

}

/***********************************************************************

// note: this is not thread safe, but as it is used for finetuning only

//       we don't care

************************************************************************/

#undef lzo_stats

/* lzo_stats_t is still defined */

#if (LZO_COLLECT_STATS)

static lzo_stats_t lzo_statistics;

lzo_stats_t * const lzo1b_stats = &lzo_statistics;

void _lzo1b_stats_init(lzo_stats_t *lzo_stats)

{

    lzo_memset(lzo_stats,0,sizeof(*lzo_stats));

}

void _lzo1b_stats_calc(lzo_stats_t *lzo_stats)

{

    lzo_stats->matches =

       lzo_stats->m1_matches + lzo_stats->m2_matches +

       lzo_stats->m3_matches + lzo_stats->m4_matches;

    lzo_stats->literal_overhead = lzo_stats->lit_runs +

       2 * (lzo_stats->r0short_runs + lzo_stats->r0fast_runs +

            lzo_stats->r0long_runs);

    lzo_stats->literal_bytes = lzo_stats->literals +

       lzo_stats->literal_overhead;

#if 0

    assert(lzo_stats->match_bytes + lzo_stats->literal_bytes ==

       lzo_stats->out_len);

#endif

    lzo_stats->m2_matches -= lzo_stats->r1_matches;

    lzo_stats->m2_match[M2_MIN_LEN] -= lzo_stats->r1_matches;

    if (lzo_stats->literals > 0)

        lzo_stats->literal_overhead_percent =

           100.0 * lzo_stats->literal_overhead / lzo_stats->literals;

}

#endif

/*

vi:ts=4:et

*/