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+/* lzo_mchw.ch -- matching functions using a window
+
+ This file is part of the LZO real-time data compression library.
+
+ Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
+ 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/
+ */
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+typedef struct
+{
+ unsigned init;
+
+ lzo_uint look; /* bytes in lookahead buffer */
+
+ lzo_uint m_len;
+ lzo_uint m_off;
+
+ lzo_uint last_m_len;
+ lzo_uint last_m_off;
+
+ const lzo_bytep bp;
+ const lzo_bytep ip;
+ const lzo_bytep in;
+ const lzo_bytep in_end;
+ lzo_bytep out;
+
+ lzo_callback_p cb;
+
+ lzo_uint textsize; /* text size counter */
+ lzo_uint codesize; /* code size counter */
+ lzo_uint printcount; /* counter for reporting progress every 1K bytes */
+
+ /* some stats */
+ unsigned long lit_bytes;
+ unsigned long match_bytes;
+ unsigned long rep_bytes;
+ unsigned long lazy;
+
+#if defined(LZO1B)
+ lzo_uint r1_m_len;
+
+ /* some stats */
+ unsigned long r1_r, m3_r, m2_m, m3_m;
+#endif
+
+#if defined(LZO1C)
+ lzo_uint r1_m_len;
+ lzo_bytep m3;
+
+ /* some stats */
+ unsigned long r1_r, m3_r, m2_m, m3_m;
+#endif
+
+#if defined(LZO1F)
+ lzo_uint r1_lit;
+ lzo_uint r1_m_len;
+
+ /* some stats */
+ unsigned long r1_r, m2_m, m3_m;
+#endif
+
+#if defined(LZO1X) || defined(LZO1Y) || defined(LZO1Z)
+ lzo_uint r1_lit;
+ lzo_uint r1_m_len;
+
+ /* some stats */
+ unsigned long m1a_m, m1b_m, m2_m, m3_m, m4_m;
+ unsigned long lit1_r, lit2_r, lit3_r;
+#endif
+
+#if defined(LZO2A)
+ /* some stats */
+ unsigned long m1, m2, m3, m4;
+#endif
+}
+LZO_COMPRESS_T;
+
+
+#if (LZO_CC_BORLANDC && LZO_ARCH_I086) && (__BORLANDC__ < 0x0450)
+ /* work around a Borland C 3.1 bug */
+# define getbyte(c) ((c).ip < (c).in_end ? (c).ip +=1, (c).ip[-1] : (-1))
+#elif (LZO_OS_TOS && (LZO_CC_PUREC || LZO_CC_TURBOC))
+ /* work around a code generation bug in Turbo C / Pure C (Atari ST) */
+# define getbyte(c) ((c).ip < (c).in_end ? (int) (unsigned) *((c).ip)++ : (-1))
+#else
+# define getbyte(c) ((c).ip < (c).in_end ? *((c).ip)++ : (-1))
+#endif
+
+#include "lzo_swd.ch"
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static int
+init_match ( LZO_COMPRESS_T *c, lzo_swd_p s,
+ const lzo_bytep dict, lzo_uint dict_len,
+ lzo_uint32 flags )
+{
+ int r;
+
+ assert(!c->init);
+ c->init = 1;
+
+ s->c = c;
+
+ c->last_m_len = c->last_m_off = 0;
+
+ c->textsize = c->codesize = c->printcount = 0;
+ c->lit_bytes = c->match_bytes = c->rep_bytes = 0;
+ c->lazy = 0;
+
+ r = swd_init(s,dict,dict_len);
+ if (r != LZO_E_OK)
+ {
+ swd_exit(s);
+ return r;
+ }
+
+ s->use_best_off = (flags & 1) ? 1 : 0;
+ return LZO_E_OK;
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static int
+find_match ( LZO_COMPRESS_T *c, lzo_swd_p s,
+ lzo_uint this_len, lzo_uint skip )
+{
+ assert(c->init);
+
+ if (skip > 0)
+ {
+ assert(this_len >= skip);
+ swd_accept(s, this_len - skip);
+ c->textsize += this_len - skip + 1;
+ }
+ else
+ {
+ assert(this_len <= 1);
+ c->textsize += this_len - skip;
+ }
+
+ s->m_len = SWD_THRESHOLD;
+ s->m_off = 0;
+#ifdef SWD_BEST_OFF
+ if (s->use_best_off)
+ lzo_memset(s->best_pos,0,sizeof(s->best_pos));
+#endif
+ swd_findbest(s);
+ c->m_len = s->m_len;
+ c->m_off = s->m_off;
+
+ swd_getbyte(s);
+
+ if (s->b_char < 0)
+ {
+ c->look = 0;
+ c->m_len = 0;
+ swd_exit(s);
+ }
+ else
+ {
+ c->look = s->look + 1;
+ }
+ c->bp = c->ip - c->look;
+
+#if 0
+ /* brute force match search */
+ if (c->m_len > SWD_THRESHOLD && c->m_len + 1 <= c->look)
+ {
+ const lzo_bytep ip = c->bp;
+ const lzo_bytep m = c->bp - c->m_off;
+ const lzo_bytep in = c->in;
+
+ if (ip - in > s->swd_n)
+ in = ip - s->swd_n;
+ for (;;)
+ {
+ while (*in != *ip)
+ in++;
+ if (in == ip)
+ break;
+ if (in != m)
+ if (lzo_memcmp(in,ip,c->m_len+1) == 0)
+ printf("%p %p %p %5d\n",in,ip,m,c->m_len);
+ in++;
+ }
+ }
+#endif
+
+ if (c->cb && c->cb->nprogress && c->textsize > c->printcount)
+ {
+ (*c->cb->nprogress)(c->cb, c->textsize, c->codesize, 0);
+ c->printcount += 1024;
+ }
+
+ return LZO_E_OK;
+}
+
+
+/*
+vi:ts=4:et
+*/
+
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