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Diffstat (limited to 'src/lzo_init.c')
| -rw-r--r-- | src/lzo_init.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/lzo_init.c b/src/lzo_init.c new file mode 100644 index 0000000..6977891 --- /dev/null +++ b/src/lzo_init.c @@ -0,0 +1,176 @@ +/* lzo_init.c -- initialization of the LZO library + + 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" + + +/*********************************************************************** +// Runtime check of the assumptions about the size of builtin types, +// memory model, byte order and other low-level constructs. +// +// We are really paranoid here - LZO should either fail +// at startup or not at all. +// +// Because of inlining much of these functions evaluates to nothing. +// +// And while many of the tests seem highly obvious and redundant they are +// here to catch compiler/optimizer bugs. Yes, these do exist. +************************************************************************/ + +#if !defined(__LZO_IN_MINILZO) + +#define ACC_WANT_ACC_CHK_CH 1 +#undef ACCCHK_ASSERT +#include "miniacc.h" + + ACCCHK_ASSERT_IS_SIGNED_T(lzo_int) + ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint) + + ACCCHK_ASSERT_IS_SIGNED_T(lzo_int32) + ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uint32) + ACCCHK_ASSERT((LZO_UINT32_C(1) << (int)(8*sizeof(LZO_UINT32_C(1))-1)) > 0) + ACCCHK_ASSERT(sizeof(lzo_uint32) >= 4) + +#if !defined(__LZO_UINTPTR_T_IS_POINTER) + ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_uintptr_t) +#endif + ACCCHK_ASSERT(sizeof(lzo_uintptr_t) >= sizeof(lzo_voidp)) + + ACCCHK_ASSERT_IS_UNSIGNED_T(lzo_xint) + ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint32)) + ACCCHK_ASSERT(sizeof(lzo_xint) >= sizeof(lzo_uint)) + ACCCHK_ASSERT(sizeof(lzo_xint) == sizeof(lzo_uint32) || sizeof(lzo_xint) == sizeof(lzo_uint)) + +#endif +#undef ACCCHK_ASSERT + + +/*********************************************************************** +// +************************************************************************/ + +LZO_PUBLIC(int) +_lzo_config_check(void) +{ + lzo_bool r = 1; + union { unsigned char c[2*sizeof(lzo_xint)]; lzo_xint l[2]; } u; + lzo_uintptr_t p; + +#if !defined(LZO_CFG_NO_CONFIG_CHECK) +#if defined(LZO_ABI_BIG_ENDIAN) + u.l[0] = u.l[1] = 0; u.c[sizeof(lzo_xint) - 1] = 128; + r &= (u.l[0] == 128); +#endif +#if defined(LZO_ABI_LITTLE_ENDIAN) + u.l[0] = u.l[1] = 0; u.c[0] = 128; + r &= (u.l[0] == 128); +#endif +#if defined(LZO_UNALIGNED_OK_2) + p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0]; + u.l[0] = u.l[1] = 0; + r &= ((* (const lzo_ushortp) (p+1)) == 0); +#endif +#if defined(LZO_UNALIGNED_OK_4) + p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0]; + u.l[0] = u.l[1] = 0; + r &= ((* (const lzo_uint32p) (p+1)) == 0); +#endif +#endif + + LZO_UNUSED(u); LZO_UNUSED(p); + return r == 1 ? LZO_E_OK : LZO_E_ERROR; +} + + +/*********************************************************************** +// +************************************************************************/ + +int __lzo_init_done = 0; + +LZO_PUBLIC(int) +__lzo_init_v2(unsigned v, int s1, int s2, int s3, int s4, int s5, + int s6, int s7, int s8, int s9) +{ + int r; + +#if defined(__LZO_IN_MINILZO) +#elif (LZO_CC_MSC && ((_MSC_VER) < 700)) +#else +#define ACC_WANT_ACC_CHK_CH 1 +#undef ACCCHK_ASSERT +#define ACCCHK_ASSERT(expr) LZO_COMPILE_TIME_ASSERT(expr) +#include "miniacc.h" +#endif +#undef ACCCHK_ASSERT + + __lzo_init_done = 1; + + if (v == 0) + return LZO_E_ERROR; + + r = (s1 == -1 || s1 == (int) sizeof(short)) && + (s2 == -1 || s2 == (int) sizeof(int)) && + (s3 == -1 || s3 == (int) sizeof(long)) && + (s4 == -1 || s4 == (int) sizeof(lzo_uint32)) && + (s5 == -1 || s5 == (int) sizeof(lzo_uint)) && + (s6 == -1 || s6 == (int) lzo_sizeof_dict_t) && + (s7 == -1 || s7 == (int) sizeof(char *)) && + (s8 == -1 || s8 == (int) sizeof(lzo_voidp)) && + (s9 == -1 || s9 == (int) sizeof(lzo_callback_t)); + if (!r) + return LZO_E_ERROR; + + r = _lzo_config_check(); + if (r != LZO_E_OK) + return r; + + return r; +} + + +#if !defined(__LZO_IN_MINILZO) +#include "lzo_dll.ch" +#endif + + +/* +vi:ts=4:et +*/ |