| 1 | <?php |
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| 2 | |
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| 3 | /****************************************************************************** |
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| 4 | * |
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| 5 | * Filename: epson.php |
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| 6 | * |
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| 7 | * Description: Epson Makernote Parser |
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| 8 | * Provides functions to decode an Epson EXIF makernote and to interpret |
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| 9 | * the resulting array into html. |
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| 10 | * |
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| 11 | * Epson Makernote Format: |
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| 12 | * |
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| 13 | * Field Size Description |
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| 14 | * ---------------------------------------------------------------- |
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| 15 | * Header 8 Bytes "EPSON\x00\x01\x00" |
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| 16 | * IFD Data Variable Standard IFD Data using Olympus Tags |
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| 17 | * ---------------------------------------------------------------- |
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| 18 | * |
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| 19 | * |
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| 20 | * Author: Evan Hunter |
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| 21 | * |
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| 22 | * Date: 30/7/2004 |
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| 23 | * |
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| 24 | * Project: JPEG Metadata |
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| 25 | * |
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| 26 | * Revision: 1.00 |
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| 27 | * |
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| 28 | * URL: http://electronics.ozhiker.com |
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| 29 | * |
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| 30 | * Copyright: Copyright " . $auteur . " 2004 |
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| 31 | * This file may be used freely for non-commercial purposes.For |
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| 32 | * commercial uses please contact the author: evan@ozhiker.com |
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| 33 | * |
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| 34 | ******************************************************************************/ |
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| 35 | |
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| 36 | |
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| 37 | // Epson makernote uses Olympus tags - ensure they are included |
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| 38 | |
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| 39 | include_once 'olympus.php'; |
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| 40 | |
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| 41 | |
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| 42 | |
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| 43 | |
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| 44 | // Add the Parser function to the list of Makernote Parsers. (Interpreter Functions are supplied by the Olympus script) |
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| 45 | |
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| 46 | $GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Epson_Makernote"; |
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| 47 | |
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| 48 | |
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| 49 | |
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| 50 | |
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| 51 | |
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| 52 | /****************************************************************************** |
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| 53 | * |
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| 54 | * Function: get_Epson_Makernote |
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| 55 | * |
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| 56 | * Description: Decodes the Makernote tag and returns the new tag with the decoded |
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| 57 | * information attached. Returns false if this is not a makernote |
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| 58 | * that can be processed with this script |
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| 59 | * |
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| 60 | * Parameters: Makernote_Tag - the element of an EXIF array containing the |
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| 61 | * makernote, as returned from get_EXIF_JPEG |
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| 62 | * EXIF_Array - the entire EXIF array containing the |
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| 63 | * makernote, as returned from get_EXIF_JPEG, in |
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| 64 | * case more information is required for decoding |
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| 65 | * filehnd - an open file handle for the file containing the |
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| 66 | * makernote - does not have to be positioned at the |
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| 67 | * start of the makernote |
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| 68 | * Make_Field - The contents of the EXIF Make field, to aid |
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| 69 | * determining whether this script can decode |
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| 70 | * the makernote |
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| 71 | * |
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| 72 | * |
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| 73 | * Returns: Makernote_Tag - the Makernote_Tag from the parameters, but |
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| 74 | * modified to contain the decoded information |
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| 75 | * FALSE - If this script could not decode the makernote, or if |
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| 76 | * an error occured in decoding |
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| 77 | * |
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| 78 | ******************************************************************************/ |
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| 79 | |
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| 80 | function get_Epson_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field ) |
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| 81 | { |
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| 82 | |
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| 83 | // Check if the Make Field contains the word Epson |
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| 84 | if ( stristr( $Make_Field, "Epson" ) === FALSE ) |
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| 85 | { |
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| 86 | return FALSE; |
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| 87 | } |
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| 88 | |
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| 89 | // Check if the header exists at the start of the Makernote |
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| 90 | if ( substr( $Makernote_Tag['Data'], 0, 8 ) != "EPSON\x00\x01\x00" ) |
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| 91 | { |
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| 92 | // This isn't a Epson Makernote, abort |
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| 93 | return FALSE ; |
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| 94 | } |
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| 95 | |
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| 96 | |
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| 97 | // Seek to the start of the IFD |
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| 98 | fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 8 ); |
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| 99 | |
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| 100 | // Read the IFD(s) into an array |
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| 101 | $Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Olympus" ); |
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| 102 | |
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| 103 | // Save some information into the Tag element to aid interpretation |
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| 104 | $Makernote_Tag['Decoded'] = TRUE; |
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| 105 | $Makernote_Tag['Makernote Type'] = "Epson"; |
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| 106 | $Makernote_Tag['Makernote Tags'] = "Olympus"; |
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| 107 | |
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| 108 | |
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| 109 | // Return the new tag |
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| 110 | return $Makernote_Tag; |
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| 111 | |
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| 112 | } |
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| 113 | |
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| 114 | /****************************************************************************** |
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| 115 | * End of Function: get_Epson_Makernote |
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| 116 | ******************************************************************************/ |
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| 117 | |
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| 118 | |
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| 119 | ?> |
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