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authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
commit3e4d8f433239c40311037616b1b8833a06651ae0 (patch)
tree98ab7fce0d011d34677b0beb762d389cb5c39199 /lzo/src/lzo1a_cr.ch
Initial import
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+/* lzo1a_cr.ch -- literal run handling for the the LZO1A 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 LZO package and is subject
+ to change.
+ */
+
+
+#ifndef __LZO1A_CR_H
+#define __LZO1A_CR_H
+
+
+/***********************************************************************
+// code a literal run
+************************************************************************/
+
+static lzo_bytep
+store_run(lzo_bytep const oo, const lzo_bytep const ii, lzo_uint r_len)
+{
+ register lzo_bytep op;
+ register const lzo_bytep ip;
+ register lzo_uint t;
+
+ op = oo;
+ ip = ii;
+ assert(r_len > 0);
+
+ /* code a long R0 run */
+ if (r_len >= 512)
+ {
+ unsigned r_bits = 6; /* 256 << 6 == 16384 */
+ lzo_uint tt = 32768u;
+
+ while (r_len >= (t = tt))
+ {
+ r_len -= t;
+ *op++ = 0; *op++ = (R0MAX - R0MIN);
+ MEMCPY8_DS(op, ip, t);
+ LZO_STATS(lzo_stats->r0long_runs++);
+ }
+ tt >>= 1;
+ do {
+ if (r_len >= (t = tt))
+ {
+ r_len -= t;
+ *op++ = 0; *op++ = LZO_BYTE((R0FAST - R0MIN) + r_bits);
+ MEMCPY8_DS(op, ip, t);
+ LZO_STATS(lzo_stats->r0long_runs++);
+ }
+ tt >>= 1;
+ } while (--r_bits > 0);
+ }
+ assert(r_len < 512);
+
+ while (r_len >= (t = R0FAST))
+ {
+ r_len -= t;
+ *op++ = 0; *op++ = (R0FAST - R0MIN);
+ MEMCPY8_DS(op, ip, t);
+ LZO_STATS(lzo_stats->r0fast_runs++);
+ }
+
+ t = r_len;
+ if (t >= R0MIN)
+ {
+ /* code a short R0 run */
+ *op++ = 0; *op++ = LZO_BYTE(t - R0MIN);
+ MEMCPY_DS(op, ip, t);
+ LZO_STATS(lzo_stats->r0short_runs++);
+ }
+ else if (t > 0)
+ {
+ /* code a short literal run */
+ LZO_STATS(lzo_stats->lit_runs++);
+ LZO_STATS(lzo_stats->lit_run[t]++);
+ *op++ = LZO_BYTE(t);
+ MEMCPY_DS(op, ip, t);
+ }
+
+ return op;
+}
+
+
+
+#endif /* already included */
+
+/*
+vi:ts=4:et
+*/
+