/* lzo_ptr.h -- low-level pointer constructs

   This file is part of the LZO real-time data compression library.

   Copyright (C) 1996-2014 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/

 */

/* WARNING: this file should *not* be used by applications. It is

   part of the implementation of the library and is subject

   to change.

 */

#ifndef __LZO_PTR_H

#define __LZO_PTR_H 1

#ifdef __cplusplus

extern "C" {

#endif

/***********************************************************************

//

************************************************************************/

/* Always use the safe (=integral) version for pointer-comparisons.

 * The compiler should optimize away the additional casts anyway.

 *

 * Note that this only works if the representation and ordering

 * of the pointer and the integral is the same (at bit level).

 */

#if (LZO_ARCH_I086)

#error "LZO_ARCH_I086 is unsupported"

#elif (LZO_MM_PVP)

#error "LZO_MM_PVP is unsupported"

#else

#define PTR(a)              ((lzo_uintptr_t) (a))

#define PTR_LINEAR(a)       PTR(a)

#define PTR_ALIGNED_4(a)    ((PTR_LINEAR(a) & 3) == 0)

#define PTR_ALIGNED_8(a)    ((PTR_LINEAR(a) & 7) == 0)

#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)

#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)

#endif

#define PTR_LT(a,b)         (PTR(a) < PTR(b))

#define PTR_GE(a,b)         (PTR(a) >= PTR(b))

#define PTR_DIFF(a,b)       (PTR(a) - PTR(b))

#define pd(a,b)             ((lzo_uint) ((a)-(b)))

LZO_EXTERN(lzo_uintptr_t)

__lzo_ptr_linear(const lzo_voidp ptr);

typedef union

{

    char            a_char;

    unsigned char   a_uchar;

    short           a_short;

    unsigned short  a_ushort;

    int             a_int;

    unsigned int    a_uint;

    long            a_long;

    unsigned long   a_ulong;

    lzo_int         a_lzo_int;

    lzo_uint        a_lzo_uint;

    lzo_xint        a_lzo_xint;

    lzo_int16_t     a_lzo_int16_t;

    lzo_uint16_t    a_lzo_uint16_t;

    lzo_int32_t     a_lzo_int32_t;

    lzo_uint32_t    a_lzo_uint32_t;

#if defined(lzo_uint64_t)

    lzo_int64_t     a_lzo_int64_t;

    lzo_uint64_t    a_lzo_uint64_t;

#endif

    size_t          a_size_t;

    ptrdiff_t       a_ptrdiff_t;

    lzo_uintptr_t   a_lzo_uintptr_t;

    void *          a_void_p;

    char *          a_char_p;

    unsigned char * a_uchar_p;

    const void *          a_c_void_p;

    const char *          a_c_char_p;

    const unsigned char * a_c_uchar_p;

    lzo_voidp       a_lzo_voidp;

    lzo_bytep       a_lzo_bytep;

    const lzo_voidp a_c_lzo_voidp;

    const lzo_bytep a_c_lzo_bytep;

}

lzo_full_align_t;

#ifdef __cplusplus

} /* extern "C" */

#endif

#endif /* already included */

/*

vi:ts=4:et

*/