Initial import

1 files changed, 242 insertions, 0 deletions

diff --git a/lzo/src/lzo_mchw.ch b/lzo/src/lzo_mchw.ch
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+++ b/lzo/src/lzo_mchw.ch
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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) 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
+{
+    int 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 defined(__TURBOC__) && defined(__TOS__)
+   /* work around a 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 != 0)
+        return r;
+
+    s->use_best_off = (flags & 1) ? 1 : 0;
+    return r;
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+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 = 1;
+    s->m_len = THRESHOLD;
+#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 > 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 > N)
+            in = ip - 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
+*/
+