1/* lzo_init.c -- initialization of the LZO library
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 "lzo_conf.h"
42
43
44/***********************************************************************
45// Runtime check of the assumptions about the size of builtin types,
46// memory model, byte order and other low-level constructs.
47//
48// We are really paranoid here - LZO should either fail
49// at startup or not at all.
50//
51// Because of inlining much of these functions evaluates to nothing.
52//
53// And while many of the tests seem highly obvious and redundant they are
54// here to catch compiler/optimizer bugs. Yes, these do exist.
55************************************************************************/
56
57#if !defined(__LZO_IN_MINILZO)
58
59#define ACC_WANT_ACC_CHK_CH 1
60#undef ACCCHK_ASSERT
61#include "miniacc.h"
62
63    ACCCHK_ASSERT_IS_SIGNED_T(lzo_int)
64    ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint)
65
66    ACCCHK_ASSERT_IS_SIGNED_T(lzo_int32)
67    ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint32)
68    ACCCHK_ASSERT((LZO_UINT32_C(1) << (int)(8*sizeof(LZO_UINT32_C(1))-1)) > 0)
69    ACCCHK_ASSERT(sizeof(lzo_uint32) >= 4)
70
71#if !defined(__LZO_UINTPTR_T_IS_POINTER)
72    ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uintptr_t)
73#endif
74    ACCCHK_ASSERT(sizeof(lzo_uintptr_t) >= sizeof(lzo_voidp))
75
76    ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_xint)
77    ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint32))
78    ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint))
79    ACCCHK_ASSERT(sizeof(lzo_xint) == sizeof(lzo_uint32) || sizeof(lzo_xint) == sizeof(lzo_uint))
80
81#endif
82#undef ACCCHK_ASSERT
83
84
85/***********************************************************************
86//
87************************************************************************/
88
89LZO_PUBLIC(int)
90_lzo_config_check(void)
91{
92    lzo_bool r = 1;
93    union { unsigned char c[2*sizeof(lzo_xint)]; lzo_xint l[2]; } u;
94    lzo_uintptr_t p;
95
96#if !defined(LZO_CFG_NO_CONFIG_CHECK)
97#if defined(LZO_ABI_BIG_ENDIAN)
98    u.l[0] = u.l[1] = 0; u.c[sizeof(lzo_xint) - 1] = 128;
99    r &= (u.l[0] == 128);
100#endif
101#if defined(LZO_ABI_LITTLE_ENDIAN)
102    u.l[0] = u.l[1] = 0; u.c[0] = 128;
103    r &= (u.l[0] == 128);
104#endif
105#if defined(LZO_UNALIGNED_OK_2)
106    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
107    u.l[0] = u.l[1] = 0;
108    r &= ((* (const lzo_ushortp) (p+1)) == 0);
109#endif
110#if defined(LZO_UNALIGNED_OK_4)
111    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
112    u.l[0] = u.l[1] = 0;
113    r &= ((* (const lzo_uint32p) (p+1)) == 0);
114#endif
115#endif
116
117    LZO_UNUSED(u); LZO_UNUSED(p);
118    return r == 1 ? LZO_E_OK : LZO_E_ERROR;
119}
120
121
122/***********************************************************************
123//
124************************************************************************/
125
126int __lzo_init_done = 0;
127
128LZO_PUBLIC(int)
129__lzo_init_v2(unsigned v, int s1, int s2, int s3, int s4, int s5,
130                          int s6, int s7, int s8, int s9)
131{
132    int r;
133
134#if defined(__LZO_IN_MINILZO)
135#elif (LZO_CC_MSC && ((_MSC_VER) < 700))
136#else
137#define ACC_WANT_ACC_CHK_CH 1
138#undef ACCCHK_ASSERT
139#define ACCCHK_ASSERT(expr)  LZO_COMPILE_TIME_ASSERT(expr)
140#include "miniacc.h"
141#endif
142#undef ACCCHK_ASSERT
143
144    __lzo_init_done = 1;
145
146    if (v == 0)
147        return LZO_E_ERROR;
148
149    r = (s1 == -1 || s1 == (int) sizeof(short)) &&
150        (s2 == -1 || s2 == (int) sizeof(int)) &&
151        (s3 == -1 || s3 == (int) sizeof(long)) &&
152        (s4 == -1 || s4 == (int) sizeof(lzo_uint32)) &&
153        (s5 == -1 || s5 == (int) sizeof(lzo_uint)) &&
154        (s6 == -1 || s6 == (int) lzo_sizeof_dict_t) &&
155        (s7 == -1 || s7 == (int) sizeof(char *)) &&
156        (s8 == -1 || s8 == (int) sizeof(lzo_voidp)) &&
157        (s9 == -1 || s9 == (int) sizeof(lzo_callback_t));
158    if (!r)
159        return LZO_E_ERROR;
160
161    r = _lzo_config_check();
162    if (r != LZO_E_OK)
163        return r;
164
165    return r;
166}
167
168
169#if !defined(__LZO_IN_MINILZO)
170#include "lzo_dll.ch"
171#endif
172
173
174/*
175vi:ts=4:et
176*/
177