1/* lzo1x_d3.c -- LZO1X decompression with preset dictionary
2
3   This file is part of the LZO real-time data compression library.
4
5   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
6   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
7   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
8   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
9   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
10   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
11   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
12   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
13   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
14   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
15   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
16   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
17   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
18   All Rights Reserved.
19
20   The LZO library is free software; you can redistribute it and/or
21   modify it under the terms of the GNU General Public License as
22   published by the Free Software Foundation; either version 2 of
23   the License, or (at your option) any later version.
24
25   The LZO library is distributed in the hope that it will be useful,
26   but WITHOUT ANY WARRANTY; without even the implied warranty of
27   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28   GNU General Public License for more details.
29
30   You should have received a copy of the GNU General Public License
31   along with the LZO library; see the file COPYING.
32   If not, write to the Free Software Foundation, Inc.,
33   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
34
35   Markus F.X.J. Oberhumer
36   <markus@oberhumer.com>
37   http://www.oberhumer.com/opensource/lzo/
38 */
39
40
41#include "config1x.h"
42
43#define LZO_TEST_OVERRUN
44
45
46#define SLOW_MEMCPY(a,b,l)      { do *a++ = *b++; while (--l > 0); }
47#define FAST_MEMCPY(a,b,l)      { lzo_memcpy(a,b,l); a += l; }
48
49#if 1 && defined(FAST_MEMCPY)
50#  define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
51        if (m_off >= (m_len)) \
52            FAST_MEMCPY(op,m_pos,m_len) \
53        else \
54            SLOW_MEMCPY(op,m_pos,m_len)
55#else
56#  define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
57        SLOW_MEMCPY(op,m_pos,m_len)
58#endif
59
60#if !defined(FAST_MEMCPY)
61#  define FAST_MEMCPY   SLOW_MEMCPY
62#endif
63
64
65#define COPY_DICT_DICT(m_len,m_off) \
66    { \
67        register const lzo_bytep m_pos; \
68        m_off -= pd(op, out); assert(m_off > 0); \
69        if (m_off > dict_len) goto lookbehind_overrun; \
70        m_pos = dict_end - m_off; \
71        if (m_len > m_off) \
72        { \
73            m_len -= m_off; \
74            FAST_MEMCPY(op,m_pos,m_off) \
75            m_pos = out; \
76            SLOW_MEMCPY(op,m_pos,m_len) \
77        } \
78        else \
79            FAST_MEMCPY(op,m_pos,m_len) \
80    }
81
82#define COPY_DICT(m_len,m_off) \
83    assert(m_len >= 2); assert(m_off > 0); assert(op > out); \
84    if (m_off <= pd(op, out)) \
85    { \
86        register const lzo_bytep m_pos = op - m_off; \
87        DICT_MEMMOVE(op,m_pos,m_len,m_off) \
88    } \
89    else \
90        COPY_DICT_DICT(m_len,m_off)
91
92
93
94
95LZO_PUBLIC(int)
96lzo1x_decompress_dict_safe ( const lzo_bytep in,  lzo_uint  in_len,
97                                   lzo_bytep out, lzo_uintp out_len,
98                                   lzo_voidp wrkmem /* NOT USED */,
99                             const lzo_bytep dict, lzo_uint dict_len)
100
101
102#include "lzo1x_d.ch"
103
104
105/*
106vi:ts=4:et
107*/
108
109