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1 <?php
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2 // +----------------------------------------------------------------------+
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3 // | PHP version 5 |
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4 // +----------------------------------------------------------------------+
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5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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6 // +----------------------------------------------------------------------+
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7 // | This source file is subject to version 2 of the GPL license, |
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8 // | that is bundled with this package in the file license.txt and is |
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9 // | available through the world-wide-web at the following url: |
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10 // | http://www.gnu.org/copyleft/gpl.html |
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11 // +----------------------------------------------------------------------+
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12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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13 // +----------------------------------------------------------------------+
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14 // | Authors: James Heinrich <infoØgetid3*org> |
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15 // | Allan Hansen <ahØartemis*dk> |
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16 // +----------------------------------------------------------------------+
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17 // | module.lib.data-hash.php |
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18 // | getID3() library file. |
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19 // | dependencies: NONE. |
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20 // +----------------------------------------------------------------------+
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21 //
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22 // $Id: module.lib.image_size.php,v 1.2 2006/11/02 10:48:02 ah Exp $
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23
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24
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25
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26 class getid3_lib_image_size
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27 {
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28
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29 const GIF_SIG = "\x47\x49\x46"; // 'GIF'
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30 const PNG_SIG = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
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31 const JPG_SIG = "\xFF\xD8\xFF";
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32 const JPG_SOS = "\xDA"; // Start Of Scan - image data start
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33 const JPG_SOF0 = "\xC0"; // Start Of Frame N
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34 const JPG_SOF1 = "\xC1"; // N indicates which compression process
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35 const JPG_SOF2 = "\xC2"; // Only SOF0-SOF2 are now in common use
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36 const JPG_SOF3 = "\xC3"; // NB: codes C4 and CC are *not* SOF markers
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37 const JPG_SOF5 = "\xC5";
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38 const JPG_SOF6 = "\xC6";
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39 const JPG_SOF7 = "\xC7";
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40 const JPG_SOF9 = "\xC9";
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41 const JPG_SOF10 = "\xCA";
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42 const JPG_SOF11 = "\xCB"; // NB: codes C4 and CC are *not* SOF markers
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43 const JPG_SOF13 = "\xCD";
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44 const JPG_SOF14 = "\xCE";
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45 const JPG_SOF15 = "\xCF";
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46 const JPG_EOI = "\xD9"; // End Of Image (end of datastream)
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47
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48
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49 static public function get($img_data) {
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50
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51 $height = $width = $type = '';
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52
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53 if ((substr($img_data, 0, 3) == getid3_lib_image_size::GIF_SIG) && (strlen($img_data) > 10)) {
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54
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55 $dim = unpack('v2dim', substr($img_data, 6, 4));
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56 $width = $dim['dim1'];
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57 $height = $dim['dim2'];
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58 $type = 1;
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59
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60 } elseif ((substr($img_data, 0, 8) == getid3_lib_image_size::PNG_SIG) && (strlen($img_data) > 24)) {
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61
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62 $dim = unpack('N2dim', substr($img_data, 16, 8));
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63 $width = $dim['dim1'];
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64 $height = $dim['dim2'];
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65 $type = 3;
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66
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67 } elseif ((substr($img_data, 0, 3) == getid3_lib_image_size::JPG_SIG) && (strlen($img_data) > 4)) {
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68
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69 ///////////////// JPG CHUNK SCAN ////////////////////
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70 $img_pos = $type = 2;
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71 $buffer = strlen($img_data) - 2;
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72 while ($img_pos < strlen($img_data)) {
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73
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74 // synchronize to the marker 0xFF
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75 $img_pos = strpos($img_data, 0xFF, $img_pos) + 1;
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76 $marker = $img_data[$img_pos];
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77 do {
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78 $marker = ord($img_data[$img_pos++]);
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79 } while ($marker == 255);
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80
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81 // find dimensions of block
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82 switch (chr($marker)) {
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83
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84 // Grab width/height from SOF segment (these are acceptable chunk types)
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85 case getid3_lib_image_size::JPG_SOF0:
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86 case getid3_lib_image_size::JPG_SOF1:
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87 case getid3_lib_image_size::JPG_SOF2:
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88 case getid3_lib_image_size::JPG_SOF3:
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89 case getid3_lib_image_size::JPG_SOF5:
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90 case getid3_lib_image_size::JPG_SOF6:
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91 case getid3_lib_image_size::JPG_SOF7:
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92 case getid3_lib_image_size::JPG_SOF9:
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93 case getid3_lib_image_size::JPG_SOF10:
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94 case getid3_lib_image_size::JPG_SOF11:
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95 case getid3_lib_image_size::JPG_SOF13:
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96 case getid3_lib_image_size::JPG_SOF14:
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97 case getid3_lib_image_size::JPG_SOF15:
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98 $dim = unpack('n2dim', substr($img_data, $img_pos + 3, 4));
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99 $height = $dim['dim1'];
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100 $width = $dim['dim2'];
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101 break 2; // found it so exit
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102
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103 case getid3_lib_image_size::JPG_EOI:
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104 case getid3_lib_image_size::JPG_SOS:
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105 return false;
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106
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107 default: // We're not interested in other markers
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108 $skiplen = (ord($img_data[$img_pos++]) << 8) + ord($img_data[$img_pos++]) - 2;
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109 // if the skip is more than what we've read in, read more
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110 $buffer -= $skiplen;
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111 if ($buffer < 512) { // if the buffer of data is too low, read more file.
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112 return false;
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113 }
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114 $img_pos += $skiplen;
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115 break;
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116 }
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117 }
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118 }
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119
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120 return array ($width, $height, $type);
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121 } // end function
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122
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123
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124 }
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125
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126 ?> |
