Initial import

1 files changed, 357 insertions, 0 deletions

diff --git a/lzo/src/lzo2a_9x.c b/lzo/src/lzo2a_9x.c
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+++ b/lzo/src/lzo2a_9x.c
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+/* lzo2a_9x.c -- implementation of the LZO2A-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 "config2a.h"
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#define THRESHOLD       1           /* lower limit for match length */
+#define F            2048           /* upper limit for match length */
+
+
+#define LZO2A
+#define LZO_COMPRESS_T  lzo2a_999_t
+#define lzo_swd_t       lzo2a_999_swd_t
+#include "lzo_mchw.ch"
+
+
+#if (LZO_CC_BORLANDC && LZO_MM_FLAT)
+#  if ((__BORLANDC__) >= 0x0450 && (__BORLANDC__) < 0x0460)
+     /* avoid internal compiler error */
+#    pragma option -Od
+#  endif
+#endif
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#define putbyte(x)      *op++ = LZO_BYTE(x)
+
+#define putbits(j,x) \
+    if (k == 0) bitp = op++; \
+    SETBITS(j,x); \
+    if (k >= 8) { *bitp = LZO_BYTE(MASKBITS(8)); DUMPBITS(8); \
+                    if (k > 0) bitp = op++; }
+
+#define putbit(x)       putbits(1,x)
+
+
+/***********************************************************************
+// this is a public function, but there is no prototype in a header file
+************************************************************************/
+
+LZO_EXTERN(int)
+lzo2a_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)
+lzo2a_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;
+    lzo_bytep bitp = 0;
+    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;
+
+    lzo_uint32 b = 0;       /* bit buffer */
+    unsigned k = 0;         /* bits in bit buffer */
+
+    /* sanity check */
+    LZO_COMPILE_TIME_ASSERT(LZO2A_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->m1 = c->m2 = c->m3 = c->m4 = 0;
+
+    op = out;
+
+    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 = 0;
+        int extra1 = 0;
+        int extra2 = 0;
+        lzo_uint ahead = 0;
+
+        LZO_UNUSED(extra1);
+
+        m_len = c->m_len;
+        m_off = c->m_off;
+
+#if (N >= 8192)
+        if (m_off >= 8192)
+        {
+            if (m_len < M3_MIN_LEN)
+                m_len = 0;
+            else
+                lazy_match_min_gain = 1;
+        }
+        else
+#endif
+        if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
+        {
+            lazy_match_min_gain = 2;
+            extra1 = 3;
+            extra2 = 2;
+        }
+        else if (m_len >= 10)
+            lazy_match_min_gain = 1;
+        else if (m_len >= 3)
+        {
+            lazy_match_min_gain = 1;
+            extra1 = 1;
+        }
+        else
+            m_len = 0;
+
+
+        /* try a lazy match */
+        if (lazy_match_min_gain > 0 && c->look > m_len)
+        {
+            int lit = swd->b_char;
+
+            r = find_match(c,swd,1,0);
+            assert(r == 0);
+            assert(c->look > 0);
+
+#if (N >= 8192)
+            if (m_off < 8192 && c->m_off >= 8192)
+                lazy_match_min_gain += extra1;
+            else
+#endif
+            if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
+            {
+                if (!(c->m_len >= M1_MIN_LEN &&
+                      c->m_len <= M1_MAX_LEN && c->m_off <= 256))
+                    lazy_match_min_gain += extra2;
+            }
+            if (c->m_len >= M1_MIN_LEN &&
+                c->m_len <= M1_MAX_LEN && c->m_off <= 256)
+            {
+                    lazy_match_min_gain -= 1;
+            }
+
+            if (lazy_match_min_gain < 1)
+                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);
+                assert(m_len >= 3 || (m_len >= 2 && m_off <= 256));
+#endif
+                /* code literal */
+                putbit(0);
+                putbyte(lit);
+                c->lit_bytes++;
+                continue;
+            }
+            else
+                ahead = 1;
+            assert(m_len > 0);
+        }
+
+
+        if (m_len == 0)
+        {
+            /* a literal */
+            putbit(0);
+            putbyte(swd->b_char);
+            c->lit_bytes++;
+            r = find_match(c,swd,1,0);
+            assert(r == 0);
+        }
+        else
+        {
+            assert(m_len >= M1_MIN_LEN);
+            assert(m_off > 0);
+            assert(m_off <= N);
+
+            /* 2 - code match */
+            if (m_len >= M1_MIN_LEN && m_len <= M1_MAX_LEN && m_off <= 256)
+            {
+                putbit(1);
+                putbit(0);
+                putbits(2,m_len - M1_MIN_LEN);
+                putbyte(m_off - 1);
+                c->m1++;
+            }
+#if (N >= 8192)
+            else if (m_off >= 8192)
+            {
+                unsigned len = m_len;
+                assert(m_len >= M3_MIN_LEN);
+                putbit(1);
+                putbit(1);
+                putbyte(m_off & 31);
+                putbyte(m_off >> 5);
+                putbit(1);
+                len -= M3_MIN_LEN - 1;
+                while (len > 255)
+                {
+                    len -= 255;
+                    putbyte(0);
+                }
+                putbyte(len);
+                c->m4++;
+            }
+#endif
+            else
+            {
+                assert(m_len >= 3);
+
+                putbit(1);
+                putbit(1);
+                if (m_len <= 9)
+                {
+                    putbyte(((m_len - 2) << 5) | (m_off & 31));
+                    putbyte(m_off >> 5);
+                    c->m2++;
+                }
+                else
+                {
+                    lzo_uint len = m_len;
+                    putbyte(m_off & 31);
+                    putbyte(m_off >> 5);
+#if (N >= 8192)
+                    putbit(0);
+#endif
+                    len -= 10 - 1;
+                    while (len > 255)
+                    {
+                        len -= 255;
+                        putbyte(0);
+                    }
+                    putbyte(len);
+                    c->m3++;
+                }
+            }
+            r = find_match(c,swd,m_len,1+ahead);
+            assert(r == 0);
+        }
+
+        c->codesize = pd(op, out);
+    }
+
+#if defined(LZO_EOF_CODE)
+    /* code EOF code */
+    putbit(1);
+    putbit(1);
+    putbyte(1 << 5);
+    putbyte(0);
+#endif
+
+    /* flush remaining bits */
+    assert(k < CHAR_BIT);
+    if (k > 0)
+    {
+        assert(b == MASKBITS(k));
+        assert(op - bitp > 1);
+        *bitp = LZO_BYTE(MASKBITS(k));
+        DUMPBITS(k);
+        assert(b == 0);
+        assert(k == 0);
+    }
+
+    assert(c->textsize == in_len);
+    c->codesize = pd(op, out);
+
+    *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) c->codesize,
+        c->lit_bytes, c->m1, c->m2, c->m3, c->m4, c->lazy);
+#endif
+    return LZO_E_OK;
+}
+
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo2a_999_compress  ( const lzo_bytep in , lzo_uint  in_len,
+                            lzo_bytep out, lzo_uintp out_len,
+                            lzo_voidp wrkmem )
+{
+    return lzo2a_999_compress_callback(in,in_len,out,out_len,wrkmem,
+                                       (lzo_callback_p) 0, 0);
+}
+
+
+/*
+vi:ts=4:et
+*/
+