forked from len0rd/rockbox
7c21a96e9a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8087 a1c6a512-1295-4272-9138-f99709370657
81 lines
2 KiB
C
81 lines
2 KiB
C
/* ucl_ptr.c -- low-level pointer constructs
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This file is part of the UCL data compression library.
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Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The UCL 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 UCL 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 UCL library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, 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/ucl/
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*/
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#include "ucl_conf.h"
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/***********************************************************************
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//
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************************************************************************/
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UCL_PUBLIC(ucl_ptr_t)
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__ucl_ptr_linear(const ucl_voidp ptr)
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{
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ucl_ptr_t p;
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#if defined(__UCL_DOS16) || defined(__UCL_WIN16)
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p = (((ucl_ptr_t)(_FP_SEG(ptr))) << (16 - __UCL_HShift)) + (_FP_OFF(ptr));
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#else
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p = 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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UCL_PUBLIC(unsigned)
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__ucl_align_gap(const ucl_voidp ptr, ucl_uint size)
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{
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ucl_ptr_t p, s, n;
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assert(size > 0);
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p = __ucl_ptr_linear(ptr);
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s = (ucl_ptr_t) (size - 1);
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#if 0
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assert((size & (size - 1)) == 0);
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n = ((p + s) & ~s) - p;
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#else
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n = (((p + s) / size) * size) - p;
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#endif
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assert((long)n >= 0);
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assert(n <= s);
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return (unsigned)n;
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}
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/*
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vi:ts=4:et
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*/
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