/* lzo1_d.ch -- common decompression stuff

   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/
 */


#if defined(LZO_TEST_OVERRUN)
#  if !defined(LZO_TEST_OVERRUN_INPUT)
#    define LZO_TEST_OVERRUN_INPUT       2
#  endif
#  if !defined(LZO_TEST_OVERRUN_OUTPUT)
#    define LZO_TEST_OVERRUN_OUTPUT      2
#  endif
#  if !defined(LZO_TEST_OVERRUN_LOOKBEHIND)
#    define LZO_TEST_OVERRUN_LOOKBEHIND
#  endif
#endif


/***********************************************************************
// Overrun detection is internally handled by these macros:
//
//   TEST_IP    test input overrun at loop begin
//   NEED_IP    test input overrun at every input byte
//
//   TEST_OP    test output overrun at loop begin
//   NEED_OP    test output overrun at every output byte
//
//   TEST_LB    test match postion
//
// The fastest decompressor results when testing for no overruns
// and using LZO_EOF_CODE.
************************************************************************/

#undef TEST_IP
#undef TEST_OP
#undef TEST_LB
#undef TEST_LBO
#undef NEED_IP
#undef NEED_OP
#undef HAVE_TEST_IP
#undef HAVE_TEST_OP
#undef HAVE_NEED_IP
#undef HAVE_NEED_OP
#undef HAVE_ANY_IP
#undef HAVE_ANY_OP


#if defined(LZO_TEST_OVERRUN_INPUT)
#  if (LZO_TEST_OVERRUN_INPUT >= 1)
#    define TEST_IP             (ip < ip_end)
#  endif
#  if (LZO_TEST_OVERRUN_INPUT >= 2)
#    define NEED_IP(x) \
            if ((lzo_uint)(ip_end - ip) < (lzo_uint)(x))  goto input_overrun
#  endif
#endif

#if defined(LZO_TEST_OVERRUN_OUTPUT)
#  if (LZO_TEST_OVERRUN_OUTPUT >= 1)
#    define TEST_OP             (op <= op_end)
#  endif
#  if (LZO_TEST_OVERRUN_OUTPUT >= 2)
#    undef TEST_OP              /* don't need both of the tests here */
#    define NEED_OP(x) \
            if ((lzo_uint)(op_end - op) < (lzo_uint)(x))  goto output_overrun
#  endif
#endif

#if defined(LZO_TEST_OVERRUN_LOOKBEHIND)
#  define TEST_LB(m_pos)        if (m_pos < out || m_pos >= op) goto lookbehind_overrun
#  define TEST_LBO(m_pos,o)     if (m_pos < out || m_pos >= op - (o)) goto lookbehind_overrun
#else
#  define TEST_LB(m_pos)        ((void) 0)
#  define TEST_LBO(m_pos,o)     ((void) 0)
#endif


#if !defined(LZO_EOF_CODE) && !defined(TEST_IP)
   /* if we have no EOF code, we have to test for the end of the input */
#  define TEST_IP               (ip < ip_end)
#endif


#if defined(TEST_IP)
#  define HAVE_TEST_IP
#else
#  define TEST_IP               1
#endif
#if defined(TEST_OP)
#  define HAVE_TEST_OP
#else
#  define TEST_OP               1
#endif

#if defined(NEED_IP)
#  define HAVE_NEED_IP
#else
#  define NEED_IP(x)            ((void) 0)
#endif
#if defined(NEED_OP)
#  define HAVE_NEED_OP
#else
#  define NEED_OP(x)            ((void) 0)
#endif


#if defined(HAVE_TEST_IP) || defined(HAVE_NEED_IP)
#  define HAVE_ANY_IP
#endif
#if defined(HAVE_TEST_OP) || defined(HAVE_NEED_OP)
#  define HAVE_ANY_OP
#endif


/*
vi:ts=4:et
*/