1/* lzo_ptr.c -- low-level pointer constructs
2
3   This file is part of the LZO real-time data compression library.
4
5   Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
6   Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
7   Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
8   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
9   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
10   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
11   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
12   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
13   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
14   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
15   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
16   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
17   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
18   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
19   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
20   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
21   All Rights Reserved.
22
23   The LZO library is free software; you can redistribute it and/or
24   modify it under the terms of the GNU General Public License as
25   published by the Free Software Foundation; either version 2 of
26   the License, or (at your option) any later version.
27
28   The LZO library is distributed in the hope that it will be useful,
29   but WITHOUT ANY WARRANTY; without even the implied warranty of
30   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
31   GNU General Public License for more details.
32
33   You should have received a copy of the GNU General Public License
34   along with the LZO library; see the file COPYING.
35   If not, write to the Free Software Foundation, Inc.,
36   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
37
38   Markus F.X.J. Oberhumer
39   <markus@oberhumer.com>
40   http://www.oberhumer.com/opensource/lzo/
41 */
42
43
44#include "lzo_conf.h"
45
46
47/***********************************************************************
48//
49************************************************************************/
50
51LZO_PUBLIC(lzo_uintptr_t)
52__lzo_ptr_linear(const lzo_voidp ptr)
53{
54    lzo_uintptr_t p;
55
56#if (LZO_ARCH_I086)
57    p = (((lzo_uintptr_t)(ACC_PTR_FP_SEG(ptr))) << (16 - ACC_MM_AHSHIFT)) + (ACC_PTR_FP_OFF(ptr));
58#elif (LZO_MM_PVP)
59    p = (lzo_uintptr_t) (ptr);
60    p = (p << 3) | (p >> 61);
61#else
62    p = (lzo_uintptr_t) PTR_LINEAR(ptr);
63#endif
64
65    return p;
66}
67
68
69/***********************************************************************
70//
71************************************************************************/
72
73LZO_PUBLIC(unsigned)
74__lzo_align_gap(const lzo_voidp ptr, lzo_uint size)
75{
76#if defined(__LZO_UINTPTR_T_IS_POINTER)
77    size_t n = (size_t) ptr;
78    n = (((n + size - 1) / size) * size) - n;
79#else
80    lzo_uintptr_t p, n;
81    p = __lzo_ptr_linear(ptr);
82    n = (((p + size - 1) / size) * size) - p;
83#endif
84
85    assert(size > 0);
86    assert((long)n >= 0);
87    assert(n <= size);
88    return (unsigned)n;
89}
90
91
92
93/*
94vi:ts=4:et
95*/
96