Imported Upstream version 2.03upstream/2.03

1 files changed, 881 insertions, 0 deletions

diff --git a/src/lzo1x_9x.c b/src/lzo1x_9x.c
new file mode 100644
index 0000000..b108bf8
--- /dev/null
+++ b/src/lzo1x_9x.c
@@ -0,0 +1,881 @@
+/* lzo1x_9x.c -- implementation of the LZO1X-999 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/
+ */
+
+
+#if !defined(LZO1X) && !defined(LZO1Y) && !defined(LZO1Z)
+#  define LZO1X
+#endif
+
+#if defined(LZO1X)
+#  include "config1x.h"
+#elif defined(LZO1Y)
+#  include "config1y.h"
+#elif defined(LZO1Z)
+#  include "config1z.h"
+#else
+#  error
+#endif
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#define N           M4_MAX_OFFSET   /* size of ring buffer */
+#define THRESHOLD       1           /* lower limit for match length */
+#define F            2048           /* upper limit for match length */
+
+#define SWD_BEST_OFF    (LZO_MAX3( M2_MAX_LEN, M3_MAX_LEN, M4_MAX_LEN ) + 1)
+
+#if defined(LZO1X)
+#  define LZO_COMPRESS_T                lzo1x_999_t
+#  define lzo_swd_t                     lzo1x_999_swd_t
+#elif defined(LZO1Y)
+#  define LZO_COMPRESS_T                lzo1y_999_t
+#  define lzo_swd_t                     lzo1y_999_swd_t
+#  define lzo1x_999_compress_internal   lzo1y_999_compress_internal
+#  define lzo1x_999_compress_dict       lzo1y_999_compress_dict
+#  define lzo1x_999_compress_level      lzo1y_999_compress_level
+#  define lzo1x_999_compress            lzo1y_999_compress
+#elif defined(LZO1Z)
+#  define LZO_COMPRESS_T                lzo1z_999_t
+#  define lzo_swd_t                     lzo1z_999_swd_t
+#  define lzo1x_999_compress_internal   lzo1z_999_compress_internal
+#  define lzo1x_999_compress_dict       lzo1z_999_compress_dict
+#  define lzo1x_999_compress_level      lzo1z_999_compress_level
+#  define lzo1x_999_compress            lzo1z_999_compress
+#else
+#  error
+#endif
+
+#if 0
+#  define HEAD3(b,p) \
+    ((((((lzo_xint)b[p]<<3)^b[p+1])<<3)^b[p+2]) & (SWD_HSIZE-1))
+#endif
+#if 0 && defined(LZO_UNALIGNED_OK_4) && defined(LZO_ABI_LITTLE_ENDIAN)
+#  define HEAD3(b,p) \
+    (((* (lzo_uint32p) &b[p]) ^ ((* (lzo_uint32p) &b[p])>>10)) & (SWD_HSIZE-1))
+#endif
+
+#include "lzo_mchw.ch"
+
+
+/* this is a public functions, but there is no prototype in a header file */
+LZO_EXTERN(int)
+lzo1x_999_compress_internal ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                              const lzo_bytep dict, lzo_uint dict_len,
+                                    lzo_callback_p cb,
+                                    int try_lazy,
+                                    lzo_uint good_length,
+                                    lzo_uint max_lazy,
+                                    lzo_uint nice_length,
+                                    lzo_uint max_chain,
+                                    lzo_uint32 flags );
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static lzo_bytep
+code_match ( LZO_COMPRESS_T *c, lzo_bytep op, lzo_uint m_len, lzo_uint m_off )
+{
+    lzo_uint x_len = m_len;
+    lzo_uint x_off = m_off;
+
+    c->match_bytes += (unsigned long) m_len;
+
+#if 0
+/*
+    static lzo_uint last_m_len = 0, last_m_off = 0;
+    static lzo_uint prev_m_off[4];
+    static int prev_m_off_ptr = 0;
+    int i;
+
+    //if (m_len >= 3 && m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
+    if (m_len >= 3 && m_len <= M2_MAX_LEN)
+    {
+    //if (m_len == last_m_len && m_off == last_m_off)
+        //printf("last_m_len + last_m_off\n");
+    //else
+    if (m_off == last_m_off)
+        printf("last_m_off\n");
+    else
+    {
+        for (i = 0; i < 4; i++)
+            if (m_off == prev_m_off[i])
+                printf("prev_m_off %d: %5ld\n",i,(long)m_off);
+    }
+    }
+    last_m_len = m_len;
+    last_m_off = prev_m_off[prev_m_off_ptr] = m_off;
+    prev_m_off_ptr = (prev_m_off_ptr + 1) & 3;
+*/
+#endif
+
+    assert(op > c->out);
+    if (m_len == 2)
+    {
+        assert(m_off <= M1_MAX_OFFSET);
+        assert(c->r1_lit > 0); assert(c->r1_lit < 4);
+        m_off -= 1;
+#if defined(LZO1Z)
+        *op++ = LZO_BYTE(M1_MARKER | (m_off >> 6));
+        *op++ = LZO_BYTE(m_off << 2);
+#else
+        *op++ = LZO_BYTE(M1_MARKER | ((m_off & 3) << 2));
+        *op++ = LZO_BYTE(m_off >> 2);
+#endif
+        c->m1a_m++;
+    }
+#if defined(LZO1Z)
+    else if (m_len <= M2_MAX_LEN && (m_off <= M2_MAX_OFFSET || m_off == c->last_m_off))
+#else
+    else if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
+#endif
+    {
+        assert(m_len >= 3);
+#if defined(LZO1X)
+        m_off -= 1;
+        *op++ = LZO_BYTE(((m_len - 1) << 5) | ((m_off & 7) << 2));
+        *op++ = LZO_BYTE(m_off >> 3);
+        assert(op[-2] >= M2_MARKER);
+#elif defined(LZO1Y)
+        m_off -= 1;
+        *op++ = LZO_BYTE(((m_len + 1) << 4) | ((m_off & 3) << 2));
+        *op++ = LZO_BYTE(m_off >> 2);
+        assert(op[-2] >= M2_MARKER);
+#elif defined(LZO1Z)
+        if (m_off == c->last_m_off)
+            *op++ = LZO_BYTE(((m_len - 1) << 5) | (0x700 >> 6));
+        else
+        {
+            m_off -= 1;
+            *op++ = LZO_BYTE(((m_len - 1) << 5) | (m_off >> 6));
+            *op++ = LZO_BYTE(m_off << 2);
+        }
+#endif
+        c->m2_m++;
+    }
+    else if (m_len == M2_MIN_LEN && m_off <= MX_MAX_OFFSET && c->r1_lit >= 4)
+    {
+        assert(m_len == 3);
+        assert(m_off > M2_MAX_OFFSET);
+        m_off -= 1 + M2_MAX_OFFSET;
+#if defined(LZO1Z)
+        *op++ = LZO_BYTE(M1_MARKER | (m_off >> 6));
+        *op++ = LZO_BYTE(m_off << 2);
+#else
+        *op++ = LZO_BYTE(M1_MARKER | ((m_off & 3) << 2));
+        *op++ = LZO_BYTE(m_off >> 2);
+#endif
+        c->m1b_m++;
+    }
+    else if (m_off <= M3_MAX_OFFSET)
+    {
+        assert(m_len >= 3);
+        m_off -= 1;
+        if (m_len <= M3_MAX_LEN)
+            *op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
+        else
+        {
+            m_len -= M3_MAX_LEN;
+            *op++ = M3_MARKER | 0;
+            while (m_len > 255)
+            {
+                m_len -= 255;
+                *op++ = 0;
+            }
+            assert(m_len > 0);
+            *op++ = LZO_BYTE(m_len);
+        }
+#if defined(LZO1Z)
+        *op++ = LZO_BYTE(m_off >> 6);
+        *op++ = LZO_BYTE(m_off << 2);
+#else
+        *op++ = LZO_BYTE(m_off << 2);
+        *op++ = LZO_BYTE(m_off >> 6);
+#endif
+        c->m3_m++;
+    }
+    else
+    {
+        lzo_uint k;
+
+        assert(m_len >= 3);
+        assert(m_off > 0x4000); assert(m_off <= 0xbfff);
+        m_off -= 0x4000;
+        k = (m_off & 0x4000) >> 11;
+        if (m_len <= M4_MAX_LEN)
+            *op++ = LZO_BYTE(M4_MARKER | k | (m_len - 2));
+        else
+        {
+            m_len -= M4_MAX_LEN;
+            *op++ = LZO_BYTE(M4_MARKER | k | 0);
+            while (m_len > 255)
+            {
+                m_len -= 255;
+                *op++ = 0;
+            }
+            assert(m_len > 0);
+            *op++ = LZO_BYTE(m_len);
+        }
+#if defined(LZO1Z)
+        *op++ = LZO_BYTE(m_off >> 6);
+        *op++ = LZO_BYTE(m_off << 2);
+#else
+        *op++ = LZO_BYTE(m_off << 2);
+        *op++ = LZO_BYTE(m_off >> 6);
+#endif
+        c->m4_m++;
+    }
+
+    c->last_m_len = x_len;
+    c->last_m_off = x_off;
+    return op;
+}
+
+
+static lzo_bytep
+STORE_RUN ( LZO_COMPRESS_T *c, lzo_bytep op, const lzo_bytep ii, lzo_uint t )
+{
+    c->lit_bytes += (unsigned long) t;
+
+    if (op == c->out && t <= 238)
+    {
+        *op++ = LZO_BYTE(17 + t);
+    }
+    else if (t <= 3)
+    {
+#if defined(LZO1Z)
+        op[-1] |= LZO_BYTE(t);
+#else
+        op[-2] |= LZO_BYTE(t);
+#endif
+        c->lit1_r++;
+    }
+    else if (t <= 18)
+    {
+        *op++ = LZO_BYTE(t - 3);
+        c->lit2_r++;
+    }
+    else
+    {
+        lzo_uint tt = t - 18;
+
+        *op++ = 0;
+        while (tt > 255)
+        {
+            tt -= 255;
+            *op++ = 0;
+        }
+        assert(tt > 0);
+        *op++ = LZO_BYTE(tt);
+        c->lit3_r++;
+    }
+    do *op++ = *ii++; while (--t > 0);
+
+    return op;
+}
+
+
+static lzo_bytep
+code_run ( LZO_COMPRESS_T *c, lzo_bytep op, const lzo_bytep ii,
+           lzo_uint lit, lzo_uint m_len )
+{
+    if (lit > 0)
+    {
+        assert(m_len >= 2);
+        op = STORE_RUN(c,op,ii,lit);
+        c->r1_m_len = m_len;
+        c->r1_lit = lit;
+    }
+    else
+    {
+        assert(m_len >= 3);
+        c->r1_m_len = 0;
+        c->r1_lit = 0;
+    }
+
+    return op;
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static int
+len_of_coded_match ( lzo_uint m_len, lzo_uint m_off, lzo_uint lit )
+{
+    int n = 4;
+
+    if (m_len < 2)
+        return -1;
+    if (m_len == 2)
+        return (m_off <= M1_MAX_OFFSET && lit > 0 && lit < 4) ? 2 : -1;
+    if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
+        return 2;
+    if (m_len == M2_MIN_LEN && m_off <= MX_MAX_OFFSET && lit >= 4)
+        return 2;
+    if (m_off <= M3_MAX_OFFSET)
+    {
+        if (m_len <= M3_MAX_LEN)
+            return 3;
+        m_len -= M3_MAX_LEN;
+        while (m_len > 255)
+        {
+            m_len -= 255;
+            n++;
+        }
+        return n;
+    }
+    if (m_off <= M4_MAX_OFFSET)
+    {
+        if (m_len <= M4_MAX_LEN)
+            return 3;
+        m_len -= M4_MAX_LEN;
+        while (m_len > 255)
+        {
+            m_len -= 255;
+            n++;
+        }
+        return n;
+    }
+    return -1;
+}
+
+
+static lzo_int
+min_gain(lzo_uint ahead, lzo_uint lit1, lzo_uint lit2, int l1, int l2, int l3)
+{
+    lzo_int lazy_match_min_gain = 0;
+
+    assert (ahead >= 1);
+    lazy_match_min_gain += ahead;
+
+#if 0
+    if (l3 > 0)
+        lit2 -= ahead;
+#endif
+
+    if (lit1 <= 3)
+        lazy_match_min_gain += (lit2 <= 3) ? 0 : 2;
+    else if (lit1 <= 18)
+        lazy_match_min_gain += (lit2 <= 18) ? 0 : 1;
+
+    lazy_match_min_gain += (l2 - l1) * 2;
+    if (l3 > 0)
+        lazy_match_min_gain -= (ahead - l3) * 2;
+
+    if (lazy_match_min_gain < 0)
+        lazy_match_min_gain = 0;
+
+#if 0
+    if (l1 == 2)
+        if (lazy_match_min_gain == 0)
+            lazy_match_min_gain = 1;
+#endif
+
+    return lazy_match_min_gain;
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#if !defined(NDEBUG)
+static
+void assert_match( const lzo_swd_p swd, lzo_uint m_len, lzo_uint m_off )
+{
+    const LZO_COMPRESS_T *c = swd->c;
+    lzo_uint d_off;
+
+    assert(m_len >= 2);
+    if (m_off <= (lzo_uint) (c->bp - c->in))
+    {
+        assert(c->bp - m_off + m_len < c->ip);
+        assert(lzo_memcmp(c->bp, c->bp - m_off, m_len) == 0);
+    }
+    else
+    {
+        assert(swd->dict != NULL);
+        d_off = m_off - (lzo_uint) (c->bp - c->in);
+        assert(d_off <= swd->dict_len);
+        if (m_len > d_off)
+        {
+            assert(lzo_memcmp(c->bp, swd->dict_end - d_off, d_off) == 0);
+            assert(c->in + m_len - d_off < c->ip);
+            assert(lzo_memcmp(c->bp + d_off, c->in, m_len - d_off) == 0);
+        }
+        else
+        {
+            assert(lzo_memcmp(c->bp, swd->dict_end - d_off, m_len) == 0);
+        }
+    }
+}
+#else
+#  define assert_match(a,b,c)   ((void)0)
+#endif
+
+
+#if defined(SWD_BEST_OFF)
+
+static void
+better_match ( const lzo_swd_p swd, lzo_uint *m_len, lzo_uint *m_off )
+{
+#if defined(LZO1Z)
+    const LZO_COMPRESS_T *c = swd->c;
+#endif
+
+    if (*m_len <= M2_MIN_LEN)
+        return;
+#if defined(LZO1Z)
+    if (*m_off == c->last_m_off && *m_len <= M2_MAX_LEN)
+        return;
+#if 1
+    if (*m_len >= M2_MIN_LEN + 1 && *m_len <= M2_MAX_LEN + 1 &&
+        c->last_m_off && swd->best_off[*m_len-1] == c->last_m_off)
+    {
+        *m_len = *m_len - 1;
+        *m_off = swd->best_off[*m_len];
+        return;
+    }
+#endif
+#endif
+
+    if (*m_off <= M2_MAX_OFFSET)
+        return;
+
+#if 1
+    /* M3/M4 -> M2 */
+    if (*m_off > M2_MAX_OFFSET &&
+        *m_len >= M2_MIN_LEN + 1 && *m_len <= M2_MAX_LEN + 1 &&
+        swd->best_off[*m_len-1] && swd->best_off[*m_len-1] <= M2_MAX_OFFSET)
+    {
+        *m_len = *m_len - 1;
+        *m_off = swd->best_off[*m_len];
+        return;
+    }
+#endif
+
+#if 1
+    /* M4 -> M2 */
+    if (*m_off > M3_MAX_OFFSET &&
+        *m_len >= M4_MAX_LEN + 1 && *m_len <= M2_MAX_LEN + 2 &&
+        swd->best_off[*m_len-2] && swd->best_off[*m_len-2] <= M2_MAX_OFFSET)
+    {
+        *m_len = *m_len - 2;
+        *m_off = swd->best_off[*m_len];
+        return;
+    }
+#endif
+
+#if 1
+    /* M4 -> M3 */
+    if (*m_off > M3_MAX_OFFSET &&
+        *m_len >= M4_MAX_LEN + 1 && *m_len <= M3_MAX_LEN + 1 &&
+        swd->best_off[*m_len-1] && swd->best_off[*m_len-1] <= M3_MAX_OFFSET)
+    {
+        *m_len = *m_len - 1;
+        *m_off = swd->best_off[*m_len];
+    }
+#endif
+}
+
+#endif
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo1x_999_compress_internal ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                              const lzo_bytep dict, lzo_uint dict_len,
+                                    lzo_callback_p cb,
+                                    int try_lazy,
+                                    lzo_uint good_length,
+                                    lzo_uint max_lazy,
+                                    lzo_uint nice_length,
+                                    lzo_uint max_chain,
+                                    lzo_uint32 flags )
+{
+    lzo_bytep op;
+    const lzo_bytep ii;
+    lzo_uint lit;
+    lzo_uint m_len, m_off;
+    LZO_COMPRESS_T cc;
+    LZO_COMPRESS_T * const c = &cc;
+    lzo_swd_p const swd = (lzo_swd_p) wrkmem;
+    int r;
+
+    /* sanity check */
+#if defined(LZO1X)
+    LZO_COMPILE_TIME_ASSERT(LZO1X_999_MEM_COMPRESS >= SIZEOF_LZO_SWD_T)
+#elif defined(LZO1Y)
+    LZO_COMPILE_TIME_ASSERT(LZO1Y_999_MEM_COMPRESS >= SIZEOF_LZO_SWD_T)
+#elif defined(LZO1Z)
+    LZO_COMPILE_TIME_ASSERT(LZO1Z_999_MEM_COMPRESS >= SIZEOF_LZO_SWD_T)
+#else
+#  error
+#endif
+
+/* setup parameter defaults */
+    /* number of lazy match tries */
+    if (try_lazy < 0)
+        try_lazy = 1;
+    /* reduce lazy match search if we already have a match with this length */
+    if (good_length <= 0)
+        good_length = 32;
+    /* do not try a lazy match if we already have a match with this length */
+    if (max_lazy <= 0)
+        max_lazy = 32;
+    /* stop searching for longer matches than this one */
+    if (nice_length <= 0)
+        nice_length = 0;
+    /* don't search more positions than this */
+    if (max_chain <= 0)
+        max_chain = SWD_MAX_CHAIN;
+
+    c->init = 0;
+    c->ip = c->in = in;
+    c->in_end = in + in_len;
+    c->out = out;
+    c->cb = cb;
+    c->m1a_m = c->m1b_m = c->m2_m = c->m3_m = c->m4_m = 0;
+    c->lit1_r = c->lit2_r = c->lit3_r = 0;
+
+    op = out;
+    ii = c->ip;             /* point to start of literal run */
+    lit = 0;
+    c->r1_lit = c->r1_m_len = 0;
+
+    r = init_match(c,swd,dict,dict_len,flags);
+    if (r != 0)
+        return r;
+    if (max_chain > 0)
+        swd->max_chain = max_chain;
+    if (nice_length > 0)
+        swd->nice_length = nice_length;
+
+    r = find_match(c,swd,0,0);
+    if (r != 0)
+        return r;
+    while (c->look > 0)
+    {
+        lzo_uint ahead;
+        lzo_uint max_ahead;
+        int l1, l2, l3;
+
+        c->codesize = pd(op, out);
+
+        m_len = c->m_len;
+        m_off = c->m_off;
+
+        assert(c->bp == c->ip - c->look);
+        assert(c->bp >= in);
+        if (lit == 0)
+            ii = c->bp;
+        assert(ii + lit == c->bp);
+        assert(swd->b_char == *(c->bp));
+
+        if ( m_len < 2 ||
+            (m_len == 2 && (m_off > M1_MAX_OFFSET || lit == 0 || lit >= 4)) ||
+#if 1
+            /* Do not accept this match for compressed-data compatibility
+             * with LZO v1.01 and before
+             * [ might be a problem for decompress() and optimize() ]
+             */
+            (m_len == 2 && op == out) ||
+#endif
+            (op == out && lit == 0))
+        {
+            /* a literal */
+            m_len = 0;
+        }
+        else if (m_len == M2_MIN_LEN)
+        {
+            /* compression ratio improves if we code a literal in some cases */
+            if (m_off > MX_MAX_OFFSET && lit >= 4)
+                m_len = 0;
+        }
+
+        if (m_len == 0)
+        {
+    /* a literal */
+            lit++;
+            swd->max_chain = max_chain;
+            r = find_match(c,swd,1,0);
+            assert(r == 0);
+            continue;
+        }
+
+    /* a match */
+#if defined(SWD_BEST_OFF)
+        if (swd->use_best_off)
+            better_match(swd,&m_len,&m_off);
+#endif
+        assert_match(swd,m_len,m_off);
+
+
+
+        /* shall we try a lazy match ? */
+        ahead = 0;
+        if (try_lazy <= 0 || m_len >= max_lazy)
+        {
+            /* no */
+            l1 = 0;
+            max_ahead = 0;
+        }
+        else
+        {
+            /* yes, try a lazy match */
+            l1 = len_of_coded_match(m_len,m_off,lit);
+            assert(l1 > 0);
+#if 1
+            max_ahead = LZO_MIN((lzo_uint)try_lazy, (lzo_uint)l1 - 1);
+#else
+            max_ahead = LZO_MIN3(try_lazy, l1, m_len - 1);
+#endif
+        }
+
+
+        while (ahead < max_ahead && c->look > m_len)
+        {
+            lzo_int lazy_match_min_gain;
+
+            if (m_len >= good_length)
+                swd->max_chain = max_chain >> 2;
+            else
+                swd->max_chain = max_chain;
+            r = find_match(c,swd,1,0);
+            ahead++;
+
+            assert(r == 0);
+            assert(c->look > 0);
+            assert(ii + lit + ahead == c->bp);
+
+#if defined(LZO1Z)
+            if (m_off == c->last_m_off && c->m_off != c->last_m_off)
+                if (m_len >= M2_MIN_LEN && m_len <= M2_MAX_LEN)
+                    c->m_len = 0;
+#endif
+            if (c->m_len < m_len)
+                continue;
+#if 1
+            if (c->m_len == m_len && c->m_off >= m_off)
+                continue;
+#endif
+#if defined(SWD_BEST_OFF)
+            if (swd->use_best_off)
+                better_match(swd,&c->m_len,&c->m_off);
+#endif
+            l2 = len_of_coded_match(c->m_len,c->m_off,lit+ahead);
+            if (l2 < 0)
+                continue;
+#if 0
+            if (c->m_len == m_len && l2 >= l1)
+                continue;
+#endif
+
+
+#if 1
+            /* compressed-data compatibility [see above] */
+            l3 = (op == out) ? -1 : len_of_coded_match(ahead,m_off,lit);
+#else
+            l3 = len_of_coded_match(ahead,m_off,lit);
+#endif
+
+            lazy_match_min_gain = min_gain(ahead,lit,lit+ahead,l1,l2,l3);
+            if (c->m_len >= m_len + lazy_match_min_gain)
+            {
+                c->lazy++;
+                assert_match(swd,c->m_len,c->m_off);
+
+                if (l3 > 0)
+                {
+                    /* code previous run */
+                    op = code_run(c,op,ii,lit,ahead);
+                    lit = 0;
+                    /* code shortened match */
+                    op = code_match(c,op,ahead,m_off);
+                }
+                else
+                {
+                    lit += ahead;
+                    assert(ii + lit == c->bp);
+                }
+                goto lazy_match_done;
+            }
+        }
+
+
+        assert(ii + lit + ahead == c->bp);
+
+        /* 1 - code run */
+        op = code_run(c,op,ii,lit,m_len);
+        lit = 0;
+
+        /* 2 - code match */
+        op = code_match(c,op,m_len,m_off);
+        swd->max_chain = max_chain;
+        r = find_match(c,swd,m_len,1+ahead);
+        assert(r == 0);
+
+lazy_match_done: ;
+    }
+
+
+    /* store final run */
+    if (lit > 0)
+        op = STORE_RUN(c,op,ii,lit);
+
+#if defined(LZO_EOF_CODE)
+    *op++ = M4_MARKER | 1;
+    *op++ = 0;
+    *op++ = 0;
+#endif
+
+    c->codesize = pd(op, out);
+    assert(c->textsize == in_len);
+
+    *out_len = pd(op, out);
+
+    if (c->cb && c->cb->nprogress)
+        (*c->cb->nprogress)(c->cb, c->textsize, c->codesize, 0);
+
+#if 0
+    printf("%ld %ld -> %ld  %ld: %ld %ld %ld %ld %ld  %ld: %ld %ld %ld  %ld\n",
+        (long) c->textsize, (long) in_len, (long) c->codesize,
+        c->match_bytes, c->m1a_m, c->m1b_m, c->m2_m, c->m3_m, c->m4_m,
+        c->lit_bytes, c->lit1_r, c->lit2_r, c->lit3_r, c->lazy);
+#endif
+    assert(c->lit_bytes + c->match_bytes == in_len);
+
+    return LZO_E_OK;
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo1x_999_compress_level    ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                              const lzo_bytep dict, lzo_uint dict_len,
+                                    lzo_callback_p cb,
+                                    int compression_level )
+{
+    static const struct
+    {
+        int try_lazy;
+        lzo_uint good_length;
+        lzo_uint max_lazy;
+        lzo_uint nice_length;
+        lzo_uint max_chain;
+        lzo_uint32 flags;
+    } c[9] = {
+        {   0,   0,   0,   8,    4,   0 },      /* faster compression */
+        {   0,   0,   0,  16,    8,   0 },
+        {   0,   0,   0,  32,   16,   0 },
+
+        {   1,   4,   4,  16,   16,   0 },
+        {   1,   8,  16,  32,   32,   0 },
+        {   1,   8,  16, 128,  128,   0 },
+
+        {   2,   8,  32, 128,  256,   0 },
+        {   2,  32, 128,   F, 2048,   1 },
+        {   2,   F,   F,   F, 4096,   1 }       /* max. compression */
+    };
+
+    if (compression_level < 1 || compression_level > 9)
+        return LZO_E_ERROR;
+
+    compression_level -= 1;
+    return lzo1x_999_compress_internal(in, in_len, out, out_len, wrkmem,
+                                       dict, dict_len, cb,
+                                       c[compression_level].try_lazy,
+                                       c[compression_level].good_length,
+                                       c[compression_level].max_lazy,
+#if 0
+                                       c[compression_level].nice_length,
+#else
+                                       0,
+#endif
+                                       c[compression_level].max_chain,
+                                       c[compression_level].flags);
+}
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo1x_999_compress_dict     ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                              const lzo_bytep dict, lzo_uint dict_len )
+{
+    return lzo1x_999_compress_level(in, in_len, out, out_len, wrkmem,
+                                    dict, dict_len, 0, 8);
+}
+
+LZO_PUBLIC(int)
+lzo1x_999_compress  ( const lzo_bytep in , lzo_uint  in_len,
+                            lzo_bytep out, lzo_uintp out_len,
+                            lzo_voidp wrkmem )
+{
+    return lzo1x_999_compress_level(in, in_len, out, out_len, wrkmem,
+                                    NULL, 0, (lzo_callback_p) 0, 8);
+}
+
+
+/*
+vi:ts=4:et
+*/
+