Sergii Pylypenko
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* lzo_ptr.c -- low-level pointer constructs
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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#include "lzo_conf.h"
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/***********************************************************************
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//
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************************************************************************/
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LZO_PUBLIC(lzo_uintptr_t)
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__lzo_ptr_linear(const lzo_voidp ptr)
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{
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lzo_uintptr_t p;
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#if (LZO_ARCH_I086)
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#error "LZO_ARCH_I086 is unsupported"
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#elif (LZO_MM_PVP)
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#error "LZO_MM_PVP is unsupported"
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#else
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p = (lzo_uintptr_t) PTR_LINEAR(ptr);
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#endif
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return p;
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}
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/***********************************************************************
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//
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************************************************************************/
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LZO_PUBLIC(unsigned)
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__lzo_align_gap(const lzo_voidp ptr, lzo_uint size)
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{
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#if (__LZO_UINTPTR_T_IS_POINTER)
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#error "__LZO_UINTPTR_T_IS_POINTER is unsupported"
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#else
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lzo_uintptr_t p, n;
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if (size < 2) return 0;
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p = __lzo_ptr_linear(ptr);
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#if 0
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n = (((p + size - 1) / size) * size) - p;
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#else
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if ((size & (size - 1)) != 0)
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return 0;
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n = size; n = ((p + n - 1) & ~(n - 1)) - p;
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#endif
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#endif
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assert((long)n >= 0);
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assert(n <= size);
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return (unsigned)n;
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}
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/* vim:set ts=4 sw=4 et: */
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