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annotate liboctave/util/byte-swap.h @ 20354:227d582fa300 stable

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build: Sort generated PKG_ADD contents consistently * libinterp/mk-pkg-add: Set LC_COLLATE=C when sorting for consistent output.
author Mike Miller <mtmiller@octave.org>
date Fri, 10 Jul 2015 01:10:30 -0400
parents 4197fc428c7d
children
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1 /*
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2
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4197fc428c7d maint: Update copyright notices for 2015.
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3 Copyright (C) 1996-2015 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_byte_swap_h)
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24 #define octave_byte_swap_h 1
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25
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26 static inline void
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27 swap_bytes (void *ptr, unsigned int i, unsigned int j)
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28 {
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29 char *t = static_cast<char *> (ptr);
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30
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31 char tmp = t[i];
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32 t[i] = t[j];
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33 t[j] = tmp;
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34 }
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35
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36 template <int n>
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37 void
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38 swap_bytes (void *ptr)
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39 {
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40 for (int i = 0; i < n/2; i++)
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41 swap_bytes (ptr, i, n-1-i);
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42 }
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43
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44 template <>
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45 inline void
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46 swap_bytes<1> (void *)
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47 {
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48 }
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49
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50 template <>
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51 inline void
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52 swap_bytes<2> (void *ptr)
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53 {
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54 swap_bytes (ptr, 0, 1);
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55 }
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56
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57 template <>
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58 inline void
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59 swap_bytes<4> (void *ptr)
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60 {
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61 swap_bytes (ptr, 0, 3);
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62 swap_bytes (ptr, 1, 2);
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63 }
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65 template <>
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66 inline void
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67 swap_bytes<8> (void *ptr)
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68 {
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69 swap_bytes (ptr, 0, 7);
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70 swap_bytes (ptr, 1, 6);
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71 swap_bytes (ptr, 2, 5);
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72 swap_bytes (ptr, 3, 4);
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73 }
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74
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75 template <int n>
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76 void
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77 swap_bytes (void *ptr, int len)
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78 {
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79 char *t = static_cast<char *> (ptr);
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81 for (int i = 0; i < len; i++)
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82 {
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83 swap_bytes<n> (t);
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84 t += n;
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85 }
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86 }
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87
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88 template <>
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89 inline void
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90 swap_bytes<1> (void *, int)
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91 {
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92 }
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93
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94 #endif