Imported Upstream version 2.03upstream/2.03

1 files changed, 365 insertions, 0 deletions

diff --git a/src/lzo1b_9x.c b/src/lzo1b_9x.c
new file mode 100644
index 0000000..b80eca5
--- /dev/null
+++ b/src/lzo1b_9x.c
@@ -0,0 +1,365 @@
+/* lzo1b_9x.c -- implementation of the LZO1B-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/
+ */
+
+
+#include "config1b.h"
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#define N          0xffffL          /* size of ring buffer */
+#define THRESHOLD       2           /* lower limit for match length */
+#define F            2048           /* upper limit for match length */
+
+
+#define LZO1B
+#define LZO_COMPRESS_T  lzo1b_999_t
+#define lzo_swd_t       lzo1b_999_swd_t
+#include "lzo_mchw.ch"
+
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static lzo_bytep
+code_match ( LZO_COMPRESS_T *c, lzo_bytep op, lzo_uint m_len, lzo_uint m_off )
+{
+    if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET)
+    {
+        assert(m_len >= M2_MIN_LEN);
+        assert(m_off >= M2_MIN_OFFSET);
+
+        m_off -= M2_MIN_OFFSET;
+        /* code match len + low offset bits */
+        *op++ = LZO_BYTE(((m_len - (M2_MIN_LEN - 2)) << M2O_BITS) |
+                          (m_off & M2O_MASK));
+        /* code high offset bits */
+        *op++ = LZO_BYTE(m_off >> M2O_BITS);
+        c->m2_m++;
+    }
+    else
+    {
+        assert(m_len >= M3_MIN_LEN);
+        assert(m_off <= M3_MAX_OFFSET);
+
+        m_off -= M3_MIN_OFFSET - M3_EOF_OFFSET;
+        /* code match len */
+        if (m_len <= M3_MAX_LEN)
+            *op++ = LZO_BYTE(M3_MARKER | (m_len - (M3_MIN_LEN - 1)));
+        else
+        {
+            assert(m_len >= M4_MIN_LEN);
+            /* code M4 match len flag */
+            *op++ = M4_MARKER;
+            /* code match len */
+            m_len -= M4_MIN_LEN - 1;
+            while (m_len > 255)
+            {
+                m_len -= 255;
+                *op++ = 0;
+            }
+            assert(m_len > 0);
+            *op++ = LZO_BYTE(m_len);
+        }
+        /* code low offset bits */
+        *op++ = LZO_BYTE(m_off & M3O_MASK);
+        /* code high offset bits */
+        *op++ = LZO_BYTE(m_off >> M3O_BITS);
+
+        c->r1_m_len = 0;
+        c->m3_m++;
+    }
+    return op;
+}
+
+
+/***********************************************************************
+// this is a public function, but there is no prototype in a header file
+************************************************************************/
+
+LZO_EXTERN(int)
+lzo1b_999_compress_callback ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                                    lzo_callback_p cb,
+                                    lzo_uint max_chain );
+
+LZO_PUBLIC(int)
+lzo1b_999_compress_callback ( const lzo_bytep in , lzo_uint  in_len,
+                                    lzo_bytep out, lzo_uintp out_len,
+                                    lzo_voidp wrkmem,
+                                    lzo_callback_p cb,
+                                    lzo_uint max_chain )
+{
+    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 */
+    LZO_COMPILE_TIME_ASSERT(LZO1B_999_MEM_COMPRESS >= SIZEOF_LZO_SWD_T)
+
+    c->init = 0;
+    c->ip = c->in = in;
+    c->in_end = in + in_len;
+    c->cb = cb;
+    c->r1_r = c->m3_r = c->m2_m = c->m3_m = 0;
+
+    op = out;
+    ii = c->ip;             /* point to start of literal run */
+    lit = 0;
+    c->r1_m_len = 0;
+
+    r = init_match(c,swd,NULL,0,0);
+    if (r != 0)
+        return r;
+    if (max_chain > 0)
+        swd->max_chain = max_chain;
+
+    r = find_match(c,swd,0,0);
+    if (r != 0)
+        return r;
+    while (c->look > 0)
+    {
+        int lazy_match_min_gain = -1;
+        lzo_uint ahead = 0;
+
+        m_len = c->m_len;
+        m_off = c->m_off;
+
+#if 0
+        printf("%5ld: %5d len:%3d off:%5d\n", (c->ip-c->look)-in, c->look,
+                m_len, m_off);
+#endif
+
+        assert(c->ip - c->look >= in);
+        if (lit == 0)
+            ii = c->ip - c->look;
+        assert(ii + lit == c->ip - c->look);
+        assert(swd->b_char == *(c->ip - c->look));
+
+        if ((m_len < M2_MIN_LEN) ||
+            (m_len < M3_MIN_LEN && m_off > M2_MAX_OFFSET))
+        {
+            m_len = 0;
+        }
+        else
+        {
+            assert(c->ip - c->look - m_off >= in);
+            assert(c->ip - c->look - m_off + m_len < c->ip);
+            assert(lzo_memcmp(c->ip - c->look, c->ip - c->look - m_off,
+                              m_len) == 0);
+
+            if (lit > 0)
+            {
+                /* we have a current literal run: do not try a lazy match,
+                   if the literal could be coded into a r1 match */
+                if (lit == 1 && c->r1_m_len == M2_MIN_LEN)
+                    lazy_match_min_gain = -1;
+                else
+                    lazy_match_min_gain = 1;
+
+#if (M2_MIN_LEN == 2)
+                if (m_len == 2)
+                {
+                    /* don't code a match of len 2 if we have to
+                       code a literal run. Code a literal instead. */
+                    m_len = 0;
+                }
+#endif
+#if (M2_MIN_LEN == M3_MIN_LEN)
+                if (m_len == M2_MIN_LEN && m_off > M2_MAX_OFFSET)
+                {
+                    /* don't code a M3 match of len 3 if we have to
+                       code a literal run. Code a literal instead. */
+                    m_len = 0;
+                }
+#endif
+            }
+            else
+            {
+                /* no current literal run: only try a lazy match,
+                   if the literal could be coded into a r1 match */
+                if (c->r1_m_len == M2_MIN_LEN)
+                    lazy_match_min_gain = 0;
+                else
+                    lazy_match_min_gain = -1;
+            }
+        }
+
+
+        /* try a lazy match */
+        if (m_len == 0)
+            lazy_match_min_gain = -1;
+        if (lazy_match_min_gain >= 0 && c->look > m_len)
+        {
+            assert(m_len > 0);
+
+            r = find_match(c,swd,1,0);
+            assert(r == 0);
+            assert(c->look > 0);
+
+            if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET &&
+                c->m_off > M2_MAX_OFFSET)
+                lazy_match_min_gain += 1;
+
+            if (c->m_len >= m_len + lazy_match_min_gain)
+            {
+                c->lazy++;
+#if !defined(NDEBUG)
+                m_len = c->m_len;
+                m_off = c->m_off;
+                assert(lzo_memcmp(c->ip - c->look, c->ip - c->look - m_off,
+                                  m_len) == 0);
+#endif
+                lit++;
+                assert(ii + lit == c->ip - c->look);
+                continue;
+            }
+            else
+            {
+                ahead = 1;
+                assert(ii + lit + 1 == c->ip - c->look);
+            }
+            assert(m_len > 0);
+        }
+        assert(ii + lit + ahead == c->ip - c->look);
+
+
+        if (m_len == 0)
+        {
+            /* a literal */
+            lit++;
+            r = find_match(c,swd,1,0);
+            assert(r == 0);
+        }
+        else
+        {
+            /* 1 - store run */
+            if (lit > 0)
+            {
+                /* code current literal run */
+                if (lit == 1 && c->r1_m_len == M2_MIN_LEN)
+                {
+                    /* Code a context sensitive R1 match. */
+                    assert((op[-2] >> M2O_BITS) == (M2_MARKER >> M2O_BITS));
+                    op[-2] &= M2O_MASK;
+                    assert((op[-2] >> M2O_BITS) == 0);
+                    /* copy 1 literal */
+                    *op++ = *ii++;
+                    assert(ii + ahead == c->ip - c->look);
+                    c->r1_r++;
+                }
+                else
+                {
+                    op = STORE_RUN(op,ii,lit);
+                }
+                if (lit < R0FAST)
+                    c->r1_m_len = m_len;
+                else
+                    c->r1_m_len = 0;
+                lit = 0;
+            }
+            else
+                c->r1_m_len = 0;
+
+            /* 2 - code match */
+            op = code_match(c,op,m_len,m_off);
+            r = find_match(c,swd,m_len,1+ahead);
+            assert(r == 0);
+        }
+
+        c->codesize = pd(op, out);
+    }
+
+
+    /* store final run */
+    if (lit > 0)
+        op = STORE_RUN(op,ii,lit);
+
+#if defined(LZO_EOF_CODE)
+    *op++ = M3_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\n",
+        (long) c->textsize, (long)in_len, (long) c->codesize,
+        c->r1_r, c->m3_r, c->m2_m, c->m3_m, c->lazy);
+#endif
+    return LZO_E_OK;
+}
+
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo1b_999_compress  ( const lzo_bytep in , lzo_uint  in_len,
+                            lzo_bytep out, lzo_uintp out_len,
+                            lzo_voidp wrkmem )
+{
+    return lzo1b_999_compress_callback(in,in_len,out,out_len,wrkmem,
+                                       (lzo_callback_p) 0, 0);
+}
+
+
+/*
+vi:ts=4:et
+*/
+