Imported Upstream version 2.03upstream/2.03

1 files changed, 126 insertions, 0 deletions

diff --git a/src/lzo1b_cr.ch b/src/lzo1b_cr.ch
new file mode 100644
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+/* lzo1b_cr.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/
+ */
+
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the library and is subject
+   to change.
+ */
+
+
+
+/***********************************************************************
+// store the current literal run
+************************************************************************/
+
+        assert(ip < ip_end);
+        if (pd(ip,ii) > 0)
+        {
+            lzo_uint t = pd(ip,ii);
+
+#if defined(LZO_HAVE_R1)
+            if (ip == r1)
+            {
+                /* Code a context sensitive R1 match. */
+                LZO_STATS(lzo_stats->literals += t);
+                LZO_STATS(lzo_stats->r1_matches++);
+                assert(t == 1);
+                /* modify marker byte */
+                assert((op[-2] >> M2O_BITS) == (M2_MARKER >> M2O_BITS));
+                op[-2] &= M2O_MASK;
+                assert((op[-2] >> M2O_BITS) == 0);
+                /* copy 1 literal */
+                *op++ = *ii++;
+                r1 = ip + (M2_MIN_LEN + 1);     /* set new R1 pointer */
+            }
+            else
+#endif
+            if (t < R0MIN)
+            {
+                /* inline the copying of a short run */
+                LZO_STATS(lzo_stats->literals += t);
+                LZO_STATS(lzo_stats->lit_runs++);
+                LZO_STATS(lzo_stats->lit_run[t]++);
+#if defined(LZO_HAVE_M3)
+                if (t < LZO_SIZE(8-M3O_BITS) && op == m3)
+                {
+                /* Code a very short literal run into the low offset bits
+                 * of the previous M3/M4 match.
+                 */
+                    LZO_STATS(lzo_stats->lit_runs_after_m3_match++);
+                    LZO_STATS(lzo_stats->lit_run_after_m3_match[t]++);
+                    assert((m3[-2] >> M3O_BITS) == 0);
+                    m3[-2] |= LZO_BYTE(t << M3O_BITS);
+                }
+                else
+#endif
+                {
+                    *op++ = LZO_BYTE(t);
+                }
+                MEMCPY_DS(op, ii, t);
+#if defined(LZO_HAVE_R1)
+                r1 = ip + (M2_MIN_LEN + 1);     /* set new R1 pointer */
+#endif
+            }
+            else if (t < R0FAST)
+            {
+                /* inline the copying of a short R0 run */
+                LZO_STATS(lzo_stats->literals += t);
+                LZO_STATS(lzo_stats->r0short_runs++);
+                *op++ = 0; *op++ = LZO_BYTE(t - R0MIN);
+                MEMCPY_DS(op, ii, t);
+#if defined(LZO_HAVE_R1)
+                r1 = ip + (M2_MIN_LEN + 1);     /* set new R1 pointer */
+#endif
+            }
+            else
+            {
+                op = STORE_RUN(op,ii,t);
+                ii = ip;
+            }
+        }
+
+
+        /* ii now points to the start of the current match */
+        assert(ii == ip);
+
+
+/*
+vi:ts=4:et
+*/