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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_byte_swap_h) |
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25 #define octave_byte_swap_h 1 |
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26 |
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27 // XXX FIXME XXX -- not sure these volatile qualifiers are really |
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28 // needed or appropriate here. |
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29 |
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30 static inline void |
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31 swap_bytes (volatile void *ptr, unsigned int i, unsigned int j) |
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32 { |
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33 volatile char *t = static_cast<volatile char *> (ptr); |
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34 |
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35 char tmp = t[i]; |
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36 t[i] = t[j]; |
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37 t[j] = tmp; |
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38 } |
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39 |
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40 template <int n> |
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41 void |
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42 swap_bytes (volatile void *ptr) |
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43 { |
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44 for (size_t i = 0; i < n/2; i++) |
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45 swap_bytes (ptr, i, n-1-i); |
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46 } |
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47 |
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48 template <> |
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49 inline void |
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50 swap_bytes <1> (volatile void *) |
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51 { |
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52 } |
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53 |
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54 template <> |
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55 inline void |
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56 swap_bytes <2> (volatile void *ptr) |
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57 { |
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58 swap_bytes (ptr, 0, 1); |
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59 } |
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60 |
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61 template <> |
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62 inline void |
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63 swap_bytes <4> (volatile void *ptr) |
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64 { |
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65 swap_bytes (ptr, 0, 3); |
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66 swap_bytes (ptr, 1, 2); |
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67 } |
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68 |
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69 template <> |
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70 inline void |
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71 swap_bytes <8> (volatile void *ptr) |
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72 { |
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73 swap_bytes (ptr, 0, 7); |
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74 swap_bytes (ptr, 1, 6); |
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75 swap_bytes (ptr, 2, 5); |
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76 swap_bytes (ptr, 3, 4); |
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77 } |
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78 |
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79 template <int n> |
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80 void |
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81 swap_bytes (volatile void *ptr, int len) |
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82 { |
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83 volatile char *t = static_cast<volatile char *> (ptr); |
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84 |
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85 for (int i = 0; i < len; i++) |
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86 { |
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87 swap_bytes<n> (t); |
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88 t += n; |
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89 } |
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90 } |
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91 |
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92 template <> |
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93 inline void |
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94 swap_bytes<1> (volatile void *, int) |
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95 { |
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96 } |
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97 |
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98 #endif |
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99 |
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100 /* |
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101 ;;; Local Variables: *** |
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102 ;;; mode: C++ *** |
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103 ;;; End: *** |
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104 */ |
