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+/* lzo1b_cc.c -- LZO1B compression internal entry point
+
+ 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/
+ */
+
+
+#define LZO_NEED_DICT_H
+#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 defined(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++ = M3_MARKER | 1;
+ *op++ = 0;
+ *op++ = 0;
+ *out_len += 3;
+ }
+#endif
+
+
+#if defined(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 defined(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
+*/
+