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-rw-r--r--app/lzo/src/lzo1b_r.ch105
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-/* lzo1b_r.ch -- literal run handling for the the LZO1B/LZO1C algorithm
-
- 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/
- */
-
-
-/***********************************************************************
-// store a literal run (internal)
-************************************************************************/
-
-LZO_PUBLIC(lzo_bytep )
-STORE_RUN ( lzo_bytep const oo, const lzo_bytep const ii, lzo_uint r_len)
-{
- lzo_bytep op;
- const lzo_bytep ip;
- lzo_uint t;
-
- LZO_STATS(lzo_stats->literals += r_len);
-
- 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++ = (R0FAST - R0MIN) + 7;
- 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;
-}
-
-
-/*
-vi:ts=4:et
-*/
-