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1 <!-- Creator : groff version 1.18.1 --> |
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2 <!-- CreationDate: Mon Mar 13 18:03:10 2006 --> |
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4 <head> |
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5 <meta name="generator" content="groff -Thtml, see www.gnu.org"> |
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7 <title>SWAB</title> |
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8 </head> |
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9 <body> |
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10 |
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11 <h1 align=center>SWAB</h1> |
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12 <a href="#NAME">NAME</a><br> |
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13 <a href="#SYNOPSIS">SYNOPSIS</a><br> |
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14 <a href="#DESCRIPTION">DESCRIPTION</a><br> |
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15 <a href="#DIAGNOSTICS">DIAGNOSTICS</a><br> |
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16 <a href="#SEE ALSO">SEE ALSO</a><br> |
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17 |
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18 <hr> |
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19 <a name="NAME"></a> |
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20 <h2>NAME</h2> |
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21 <!-- INDENTATION --> |
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24 <tr valign="top" align="left"> |
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25 <td width="8%"></td> |
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26 <td width="91%"> |
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27 <p>TIFFGetBitRevTable, TIFFReverseBits, TIFFSwabShort, |
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28 TIFFSwabLong, TIFFSwabArrayOfShort, TIFFSwabArrayOfLong |
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29 − byte- and bit-swapping routines</p> |
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30 </td> |
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31 </table> |
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32 <a name="SYNOPSIS"></a> |
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33 <h2>SYNOPSIS</h2> |
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34 <!-- INDENTATION --> |
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39 <td width="91%"> |
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40 <p><b>#include <tiffio.h></b></p> |
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41 <!-- INDENTATION --> |
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42 <p><b>const unsigned char* TIFFGetBitRevTable(int</b> |
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43 <i>reversed</i><b>)<br> |
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44 void TIFFReverseBits(u_char *</b><i>data</i><b>, unsigned |
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45 long</b> <i>nbytes</i><b>)<br> |
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46 void TIFFSwabShort(uint16 *</b><i>data</i><b>)<br> |
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47 void TIFFSwabLong(uint32 *</b><i>data</i><b>)<br> |
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48 void TIFFSwabArrayOfShort(uint16 *</b><i>data</i><b>, |
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49 unsigned long</b> <i>nshorts</i><b>)<br> |
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50 void TIFFSwabArrayOfLong(uint32 *</b><i>data</i><b>, |
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51 unsigned long</b> <i>nlongs</i><b>)</b></p> |
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52 </td> |
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53 </table> |
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54 <a name="DESCRIPTION"></a> |
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55 <h2>DESCRIPTION</h2> |
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56 <!-- INDENTATION --> |
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60 <td width="8%"></td> |
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61 <td width="91%"> |
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62 <p>The following routines are used by the library to swap |
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63 16- and 32-bit data and to reverse the order of bits in |
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64 bytes.</p> |
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65 <!-- INDENTATION --> |
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66 <p><i>TIFFSwabShort</i> and <i>TIFFSwabLong</i> swap the |
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67 bytes in a single 16-bit and 32-bit item, respectively. |
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68 <i>TIFFSwabArrayOfShort</i> and <i>TIFFSwabArrayOfLong</i> |
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69 swap the bytes in an array of 16-bit and 32-bit items, |
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70 respectively.</p> |
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71 <!-- INDENTATION --> |
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72 <p><i>TIFFReverseBits</i> replaces each byte in <i>data</i> |
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73 with the equivalent bit-reversed value. This operation is |
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74 performed with a lookup table, which is returned using the |
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75 <i>TIFFGetBitRevTable</i> function. <i>reversed</i> |
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76 parameter specifies which table should be returned. Supply |
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77 <i>1</i> if you want bit reversal table. Supply <i>0</i> to |
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78 get the table that do not reverse bit values. It is a lookup |
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79 table that can be used as an <i>identity function</i>; i.e. |
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80 <i>TIFFNoBitRevTable[n] == n</i>.</p> |
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81 </td> |
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82 </table> |
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83 <a name="DIAGNOSTICS"></a> |
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84 <h2>DIAGNOSTICS</h2> |
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85 <!-- INDENTATION --> |
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90 <td width="91%"> |
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91 <p>None.</p> |
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92 </td> |
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93 </table> |
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94 <a name="SEE ALSO"></a> |
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95 <h2>SEE ALSO</h2> |
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96 <!-- INDENTATION --> |
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99 <tr valign="top" align="left"> |
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100 <td width="8%"></td> |
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101 <td width="91%"> |
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102 <p><b>libtiff</b>(3TIFF)</p> |
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103 <!-- INDENTATION --> |
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104 <p>Libtiff library home page: |
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105 <b>http://www.remotesensing.org/libtiff/</b></p> |
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106 </td> |
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107 </table> |
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108 <hr> |
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109 </body> |
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110 </html> |