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/* lzo_ptr.c -- low-level pointer constructs
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 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"
/***********************************************************************
//
************************************************************************/
LZO_PUBLIC(lzo_uintptr_t)
__lzo_ptr_linear(const lzo_voidp ptr)
{
lzo_uintptr_t p;
#if (LZO_ARCH_I086)
#error "LZO_ARCH_I086 is unsupported"
#elif (LZO_MM_PVP)
#error "LZO_MM_PVP is unsupported"
#else
p = (lzo_uintptr_t) PTR_LINEAR(ptr);
#endif
return p;
}
/***********************************************************************
//
************************************************************************/
LZO_PUBLIC(unsigned)
__lzo_align_gap(const lzo_voidp ptr, lzo_uint size)
{
#if (__LZO_UINTPTR_T_IS_POINTER)
#error "__LZO_UINTPTR_T_IS_POINTER is unsupported"
#else
lzo_uintptr_t p, n;
if (size < 2) return 0;
p = __lzo_ptr_linear(ptr);
#if 0
n = (((p + size - 1) / size) * size) - p;
#else
if ((size & (size - 1)) != 0)
return 0;
n = size; n = ((p + n - 1) & ~(n - 1)) - p;
#endif
#endif
assert((long)n >= 0);
assert(n <= size);
return (unsigned)n;
}
/* vim:set ts=4 sw=4 et: */
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