| 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 3318 2009-05-20 21:54:10Z vdigital $ |
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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 | ?> |
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