Initial import

1 files changed, 312 insertions, 0 deletions

diff --git a/lzo/src/lzo1f_1.c b/lzo/src/lzo1f_1.c
new file mode 100644
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+++ b/lzo/src/lzo1f_1.c
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+/* lzo1f_1.c -- implementation of the LZO1F-1 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 "lzo_conf.h"
+#include "lzo/lzo1f.h"
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+#define M2_MAX_OFFSET   0x0800
+#define M3_MAX_OFFSET   0x3fff
+#define M3_MARKER       224
+
+
+#ifndef LZO_HASH
+#define LZO_HASH        LZO_HASH_LZO_INCREMENTAL_A
+#endif
+#define D_BITS          14
+#define D_INDEX1(d,p)   d = DM(DMUL(0x21,DX3(p,5,5,6)) >> 5)
+#define D_INDEX2(d,p)   d = (d & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f)
+#include "lzo_dict.h"
+
+
+/***********************************************************************
+// compress a block of data.
+************************************************************************/
+
+static __lzo_noinline
+int do_compress          ( const lzo_bytep in , lzo_uint  in_len,
+                                 lzo_bytep out, lzo_uintp out_len,
+                                 lzo_voidp wrkmem )
+{
+    register const lzo_bytep ip;
+    lzo_bytep op;
+    const lzo_bytep const in_end = in + in_len;
+    const lzo_bytep const ip_end = in + in_len - 9;
+    const lzo_bytep ii;
+    lzo_dict_p const dict = (lzo_dict_p) wrkmem;
+
+    op = out;
+    ip = in;
+    ii = ip;
+
+    ip++;
+    for (;;)
+    {
+        register const lzo_bytep m_pos;
+        lzo_uint m_off;
+        lzo_uint m_len;
+        lzo_uint dindex;
+        lzo_uint lit;
+
+        DINDEX1(dindex,ip);
+        GINDEX(m_pos,m_off,dict,dindex,in);
+        if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M3_MAX_OFFSET))
+            goto literal;
+#if 1
+        if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
+            goto try_match;
+        DINDEX2(dindex,ip);
+#endif
+        GINDEX(m_pos,m_off,dict,dindex,in);
+        if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M3_MAX_OFFSET))
+            goto literal;
+        if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
+            goto try_match;
+        goto literal;
+
+
+try_match:
+#if 0 && defined(LZO_UNALIGNED_OK_2)
+        if (* (const lzo_ushortp) m_pos != * (const lzo_ushortp) ip)
+#else
+        if (m_pos[0] != ip[0] || m_pos[1] != ip[1])
+#endif
+        {
+        }
+        else
+        {
+            if (m_pos[2] == ip[2])
+            {
+                m_pos += 3;
+#if 0
+                if (m_off <= M2_MAX_OFFSET)
+                    goto match;
+                if (lit <= 3)
+                    goto match;
+                if (lit == 3)           /* better compression, but slower */
+                {
+                    assert(op - 2 > out); op[-2] |= LZO_BYTE(3);
+                    *op++ = *ii++; *op++ = *ii++; *op++ = *ii++;
+                    goto code_match;
+                }
+                if (*m_pos == ip[3])
+#endif
+                    goto match;
+            }
+        }
+
+
+    /* a literal */
+literal:
+        UPDATE_I(dict,0,dindex,ip,in);
+        if (++ip >= ip_end)
+            break;
+        continue;
+
+
+    /* a match */
+match:
+        UPDATE_I(dict,0,dindex,ip,in);
+        /* store current literal run */
+        lit = pd(ip,ii);
+        if (lit > 0)
+        {
+            register lzo_uint t = lit;
+
+            if (t < 4 && op > out)
+                op[-2] |= LZO_BYTE(t);
+            else if (t <= 31)
+                *op++ = LZO_BYTE(t);
+            else
+            {
+                register lzo_uint tt = t - 31;
+
+                *op++ = 0;
+                while (tt > 255)
+                {
+                    tt -= 255;
+                    *op++ = 0;
+                }
+                assert(tt > 0);
+                *op++ = LZO_BYTE(tt);
+            }
+            do *op++ = *ii++; while (--t > 0);
+        }
+        assert(ii == ip);
+
+
+        /* code the match */
+        ip += 3;
+        if (*m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++ ||
+            *m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++)
+        {
+            --ip;
+            m_len = pd(ip, ii);
+            assert(m_len >= 3); assert(m_len <= 8);
+
+            if (m_off <= M2_MAX_OFFSET)
+            {
+                m_off -= 1;
+                *op++ = LZO_BYTE(((m_len - 2) << 5) | ((m_off & 7) << 2));
+                *op++ = LZO_BYTE(m_off >> 3);
+            }
+            else if (m_len == 3 && m_off <= 2*M2_MAX_OFFSET && lit > 0)
+            {
+                m_off -= 1;
+                /* m_off -= M2_MAX_OFFSET; */
+                *op++ = LZO_BYTE(((m_off & 7) << 2));
+                *op++ = LZO_BYTE(m_off >> 3);
+            }
+            else
+            {
+                *op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
+                *op++ = LZO_BYTE((m_off & 63) << 2);
+                *op++ = LZO_BYTE(m_off >> 6);
+            }
+        }
+        else
+        {
+            {
+                const lzo_bytep end;
+                end = in_end;
+                while (ip < end && *m_pos == *ip)
+                    m_pos++, ip++;
+                m_len = pd(ip, ii);
+            }
+            assert(m_len >= 3);
+
+            if (m_len <= 33)
+                *op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
+            else
+            {
+                m_len -= 33;
+                *op++ = M3_MARKER | 0;
+                while (m_len > 255)
+                {
+                    m_len -= 255;
+                    *op++ = 0;
+                }
+                assert(m_len > 0);
+                *op++ = LZO_BYTE(m_len);
+            }
+            *op++ = LZO_BYTE((m_off & 63) << 2);
+            *op++ = LZO_BYTE(m_off >> 6);
+        }
+
+        ii = ip;
+        if (ip >= ip_end)
+            break;
+    }
+
+
+    /* store final literal run */
+    if (pd(in_end,ii) > 0)
+    {
+        register lzo_uint t = pd(in_end,ii);
+
+        if (t < 4 && op > out)
+            op[-2] |= LZO_BYTE(t);
+        else if (t <= 31)
+            *op++ = LZO_BYTE(t);
+        else
+        {
+            register lzo_uint tt = t - 31;
+
+            *op++ = 0;
+            while (tt > 255)
+            {
+                tt -= 255;
+                *op++ = 0;
+            }
+            assert(tt > 0);
+            *op++ = LZO_BYTE(tt);
+        }
+        do *op++ = *ii++; while (--t > 0);
+    }
+
+    *out_len = pd(op, out);
+    return LZO_E_OK;
+}
+
+
+/***********************************************************************
+// public entry point
+************************************************************************/
+
+LZO_PUBLIC(int)
+lzo1f_1_compress ( const lzo_bytep in , lzo_uint  in_len,
+                         lzo_bytep out, lzo_uintp out_len,
+                         lzo_voidp wrkmem )
+{
+    lzo_bytep op = out;
+    int r = LZO_E_OK;
+
+    if (in_len <= 0)
+        *out_len = 0;
+    else if (in_len <= 10)
+    {
+        *op++ = LZO_BYTE(in_len);
+        do *op++ = *in++; while (--in_len > 0);
+        *out_len = pd(op, out);
+    }
+    else
+        r = do_compress(in,in_len,out,out_len,wrkmem);
+
+    if (r == LZO_E_OK)
+    {
+        op = out + *out_len;
+        *op++ = M3_MARKER | 1;
+        *op++ = 0;
+        *op++ = 0;
+        *out_len += 3;
+    }
+
+    return r;
+}
+
+
+/*
+vi:ts=4:et
+*/
+