Initial commit: client source

2026-08-17 20:03:02 +02:00
commit 9ae37cd0ea
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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) 1996-2002 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.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Markus F.X.J. Oberhumer
+   <markus@oberhumer.com>
+ */
+
+
+#define LZO_NEED_DICT_H
+#include "config1b.h"
+
+
+/***********************************************************************
+// compression internal entry point.
+************************************************************************/
+
+int _lzo1b_do_compress   ( const lzo_byte *in,  lzo_uint  in_len,
+								 lzo_byte *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 = 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_byte *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)
+{
+	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
+*/
+