1 /* lzo1_d.ch -- common decompression stuff
3 This file is part of the LZO real-time data compression library.
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
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.
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.
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.
35 Markus F.X.J. Oberhumer
36 <markus@oberhumer.com>
37 http://www.oberhumer.com/opensource/lzo/
42 #if defined(LZO_TEST_OVERRUN)
43 # if !defined(LZO_TEST_OVERRUN_INPUT)
44 # define LZO_TEST_OVERRUN_INPUT 2
46 # if !defined(LZO_TEST_OVERRUN_OUTPUT)
47 # define LZO_TEST_OVERRUN_OUTPUT 2
49 # if !defined(LZO_TEST_OVERRUN_LOOKBEHIND)
50 # define LZO_TEST_OVERRUN_LOOKBEHIND
55 /***********************************************************************
56 // Overrun detection is internally handled by these macros:
58 // TEST_IP test input overrun at loop begin
59 // NEED_IP test input overrun at every input byte
61 // TEST_OP test output overrun at loop begin
62 // NEED_OP test output overrun at every output byte
64 // TEST_LB test match postion
66 // The fastest decompressor results when testing for no overruns
67 // and using LZO_EOF_CODE.
68 ************************************************************************/
84 #if defined(LZO_TEST_OVERRUN_INPUT)
85 # if (LZO_TEST_OVERRUN_INPUT >= 1)
86 # define TEST_IP (ip < ip_end)
88 # if (LZO_TEST_OVERRUN_INPUT >= 2)
90 if ((lzo_uint)(ip_end - ip) < (lzo_uint)(x)) goto input_overrun
94 #if defined(LZO_TEST_OVERRUN_OUTPUT)
95 # if (LZO_TEST_OVERRUN_OUTPUT >= 1)
96 # define TEST_OP (op <= op_end)
98 # if (LZO_TEST_OVERRUN_OUTPUT >= 2)
99 # undef TEST_OP /* don't need both of the tests here */
100 # define NEED_OP(x) \
101 if ((lzo_uint)(op_end - op) < (lzo_uint)(x)) goto output_overrun
105 #if defined(LZO_TEST_OVERRUN_LOOKBEHIND)
106 # define TEST_LB(m_pos) if (m_pos < out || m_pos >= op) goto lookbehind_overrun
107 # define TEST_LBO(m_pos,o) if (m_pos < out || m_pos >= op - (o)) goto lookbehind_overrun
109 # define TEST_LB(m_pos) ((void) 0)
110 # define TEST_LBO(m_pos,o) ((void) 0)
114 #if !defined(LZO_EOF_CODE) && !defined(TEST_IP)
115 /* if we have no EOF code, we have to test for the end of the input */
116 # define TEST_IP (ip < ip_end)
121 # define HAVE_TEST_IP
126 # define HAVE_TEST_OP
132 # define HAVE_NEED_IP
134 # define NEED_IP(x) ((void) 0)
137 # define HAVE_NEED_OP
139 # define NEED_OP(x) ((void) 0)
143 #if defined(HAVE_TEST_IP) || defined(HAVE_NEED_IP)
146 #if defined(HAVE_TEST_OP) || defined(HAVE_NEED_OP)