release/src/router/lzo/src/lzo_init.c

   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) 2011 Markus Franz Xaver Johannes Oberhumer
   6    Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
   7    Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
   8    Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   9    Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
  10    Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
  11    Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
  12    Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
  13    Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
  14    Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
  15    Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
  16    Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
  17    Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
  18    Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
  19    Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
  20    Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
  21    All Rights Reserved.
  22
  23    The LZO library is free software; you can redistribute it and/or
  24    modify it under the terms of the GNU General Public License as
  25    published by the Free Software Foundation; either version 2 of
  26    the License, or (at your option) any later version.
  27
  28    The LZO library is distributed in the hope that it will be useful,
  29    but WITHOUT ANY WARRANTY; without even the implied warranty of
  30    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31    GNU General Public License for more details.
  32
  33    You should have received a copy of the GNU General Public License
  34    along with the LZO library; see the file COPYING.
  35    If not, write to the Free Software Foundation, Inc.,
  36    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  37
  38    Markus F.X.J. Oberhumer
  39    <markus@oberhumer.com>
  40    http://www.oberhumer.com/opensource/lzo/
  41  */
  42
  43
  44 #include "lzo_conf.h"
  45
  46
  47 /***********************************************************************
  48 // Runtime check of the assumptions about the size of builtin types,
  49 // memory model, byte order and other low-level constructs.
  50 //
  51 // We are really paranoid here - LZO should either fail
  52 // at startup or not at all.
  53 //
  54 // Because of inlining much of these functions evaluates to nothing.
  55 //
  56 // And while many of the tests seem highly obvious and redundant they are
  57 // here to catch compiler/optimizer bugs. Yes, these do exist.
  58 ************************************************************************/
  59
  60 #if !defined(__LZO_IN_MINILZO)
  61
  62 #define ACC_WANT_ACC_CHK_CH 1
  63 #undef ACCCHK_ASSERT
  64 #include "miniacc.h"
  65
  66     ACCCHK_ASSERT_IS_SIGNED_T(lzo_int)
  67     ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint)
  68
  69     ACCCHK_ASSERT_IS_SIGNED_T(lzo_int32)
  70     ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint32)
  71     ACCCHK_ASSERT((LZO_UINT32_C(1) << (int)(8*sizeof(LZO_UINT32_C(1))-1)) > 0)
  72     ACCCHK_ASSERT(sizeof(lzo_uint32) >= 4)
  73 #if defined(LZO_UINT64_MAX)
  74     ACCCHK_ASSERT(sizeof(lzo_uint64) == 8)
  75     ACCCHK_ASSERT_IS_SIGNED_T(lzo_int64)
  76     ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint64)
  77 #endif
  78
  79 #if !defined(__LZO_UINTPTR_T_IS_POINTER)
  80     ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uintptr_t)
  81 #endif
  82     ACCCHK_ASSERT(sizeof(lzo_uintptr_t) >= sizeof(lzo_voidp))
  83
  84     ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_xint)
  85     ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint32))
  86     ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint))
  87     ACCCHK_ASSERT(sizeof(lzo_xint) == sizeof(lzo_uint32) || sizeof(lzo_xint) == sizeof(lzo_uint))
  88
  89 #endif
  90 #undef ACCCHK_ASSERT
  91
  92
  93 /***********************************************************************
  94 //
  95 ************************************************************************/
  96
  97 #define WANT_lzo_bitops_clz32 1
  98 #define WANT_lzo_bitops_clz64 1
  99 #define WANT_lzo_bitops_ctz32 1
 100 #define WANT_lzo_bitops_ctz64 1
 101 #include "lzo_func.ch"
 102
 103 #if 0
 104 #define u2p(ptr,off) ((lzo_voidp) (((lzo_bytep)(lzo_voidp)(ptr)) + (off)))
 105 #else
 106 static __lzo_noinline lzo_voidp u2p(lzo_voidp ptr, lzo_uint off)
 107 {
 108     return (lzo_voidp) ((lzo_bytep) ptr + off);
 109 }
 110 #endif
 111
 112 LZO_PUBLIC(int)
 113 _lzo_config_check(void)
 114 {
 115     lzo_bool r = 1;
 116     union {
 117         lzo_xint a[2]; unsigned char b[2*LZO_MAX(8,sizeof(lzo_xint))];
 118 #if defined(LZO_UNALIGNED_OK_8)
 119         lzo_uint64 c[2];
 120 #endif
 121         unsigned short x[2]; lzo_uint32 y[2]; lzo_uint z[2];
 122     } u;
 123     lzo_voidp p;
 124
 125     u.a[0] = u.a[1] = 0;
 126     p = u2p(&u, 0);
 127     r &= ((* (lzo_bytep) p) == 0);
 128 #if !defined(LZO_CFG_NO_CONFIG_CHECK)
 129 #if defined(LZO_ABI_BIG_ENDIAN)
 130     u.a[0] = u.a[1] = 0; u.b[sizeof(lzo_uint) - 1] = 128;
 131     p = u2p(&u, 0);
 132     r &= ((* (lzo_uintp) p) == 128);
 133 #endif
 134 #if defined(LZO_ABI_LITTLE_ENDIAN)
 135     u.a[0] = u.a[1] = 0; u.b[0] = 128;
 136     p = u2p(&u, 0);
 137     r &= ((* (lzo_uintp) p) == 128);
 138 #endif
 139 #if defined(LZO_UNALIGNED_OK_2)
 140     u.a[0] = u.a[1] = 0;
 141     u.b[0] = 1; u.b[sizeof(unsigned short) + 1] = 2;
 142     p = u2p(&u, 1);
 143     r &= ((* (lzo_ushortp) p) == 0);
 144 #endif
 145 #if defined(LZO_UNALIGNED_OK_4)
 146     u.a[0] = u.a[1] = 0;
 147     u.b[0] = 3; u.b[sizeof(lzo_uint32) + 1] = 4;
 148     p = u2p(&u, 1);
 149     r &= ((* (lzo_uint32p) p) == 0);
 150 #endif
 151 #if defined(LZO_UNALIGNED_OK_8)
 152     u.c[0] = u.c[1] = 0;
 153     u.b[0] = 5; u.b[sizeof(lzo_uint64) + 1] = 6;
 154     p = u2p(&u, 1);
 155     r &= ((* (lzo_uint64p) p) == 0);
 156 #endif
 157 #if defined(lzo_bitops_clz32)
 158     { unsigned i; lzo_uint32 v = 1;
 159     for (i = 0; i < 32; i++, v <<= 1)
 160         r &= lzo_bitops_clz32(v) == 31 - i;
 161     }
 162 #endif
 163 #if defined(lzo_bitops_clz64)
 164     { unsigned i; lzo_uint64 v = 1;
 165     for (i = 0; i < 64; i++, v <<= 1)
 166         r &= lzo_bitops_clz64(v) == 63 - i;
 167     }
 168 #endif
 169 #if defined(lzo_bitops_ctz32)
 170     { unsigned i; lzo_uint32 v = 1;
 171     for (i = 0; i < 32; i++, v <<= 1)
 172         r &= lzo_bitops_ctz32(v) == i;
 173     }
 174 #endif
 175 #if defined(lzo_bitops_ctz64)
 176     { unsigned i; lzo_uint64 v = 1;
 177     for (i = 0; i < 64; i++, v <<= 1)
 178         r &= lzo_bitops_ctz64(v) == i;
 179     }
 180 #endif
 181 #endif
 182
 183     return r == 1 ? LZO_E_OK : LZO_E_ERROR;
 184 }
 185
 186
 187 /***********************************************************************
 188 //
 189 ************************************************************************/
 190
 191 LZO_PUBLIC(int)
 192 __lzo_init_v2(unsigned v, int s1, int s2, int s3, int s4, int s5,
 193                           int s6, int s7, int s8, int s9)
 194 {
 195     int r;
 196
 197 #if defined(__LZO_IN_MINILZO)
 198 #elif (LZO_CC_MSC && ((_MSC_VER) < 700))
 199 #else
 200 #define ACC_WANT_ACC_CHK_CH 1
 201 #undef ACCCHK_ASSERT
 202 #define ACCCHK_ASSERT(expr)  LZO_COMPILE_TIME_ASSERT(expr)
 203 #include "miniacc.h"
 204 #endif
 205 #undef ACCCHK_ASSERT
 206
 207     if (v == 0)
 208         return LZO_E_ERROR;
 209
 210     r = (s1 == -1 || s1 == (int) sizeof(short)) &&
 211         (s2 == -1 || s2 == (int) sizeof(int)) &&
 212         (s3 == -1 || s3 == (int) sizeof(long)) &&
 213         (s4 == -1 || s4 == (int) sizeof(lzo_uint32)) &&
 214         (s5 == -1 || s5 == (int) sizeof(lzo_uint)) &&
 215         (s6 == -1 || s6 == (int) lzo_sizeof_dict_t) &&
 216         (s7 == -1 || s7 == (int) sizeof(char *)) &&
 217         (s8 == -1 || s8 == (int) sizeof(lzo_voidp)) &&
 218         (s9 == -1 || s9 == (int) sizeof(lzo_callback_t));
 219     if (!r)
 220         return LZO_E_ERROR;
 221
 222     r = _lzo_config_check();
 223     if (r != LZO_E_OK)
 224         return r;
 225
 226     return r;
 227 }
 228
 229
 230 #if !defined(__LZO_IN_MINILZO)
 231 #include "lzo_dll.ch"
 232 #endif
 233
 234
 235 /*
 236 vi:ts=4:et
 237 */