david
790d6f170a
git-svn-id: https://192.168.0.254/svn/Proyectos.MatritumCantat_Web/trunk@2 8e3496fd-7892-4c45-be36-0ff06e9dacc6
285 lines
12 KiB
PHP
285 lines
12 KiB
PHP
<?php
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/******************************************************************************
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*
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* Filename: PictureInfo.php
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*
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* Description: Provides functions for reading and writing information to/from
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* the 'App 12' Picture Info segment of JPEG format files
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*
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* Author: Evan Hunter
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*
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* Date: 23/7/2004
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*
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* Project: PHP JPEG Metadata Toolkit
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*
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* Revision: 1.00
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*
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* URL: http://electronics.ozhiker.com
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*
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* Copyright: Copyright Evan Hunter 2004
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*
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* License: This file is part of the PHP JPEG Metadata Toolkit.
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*
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* The PHP JPEG Metadata Toolkit is free software; you can
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* redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The PHP JPEG Metadata Toolkit is distributed in the hope
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* that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with the PHP JPEG Metadata Toolkit; if not,
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* write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* If you require a different license for commercial or other
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* purposes, please contact the author: evan@ozhiker.com
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*
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******************************************************************************/
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include_once 'Unicode.php';
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/******************************************************************************
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*
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* Function: get_jpeg_App12_Pic_Info
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*
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* Description: Retrieves the Picture Info text information from an App12
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* JPEG segment and returns it as a string. Uses information
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* supplied by the get_jpeg_header_data function
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*
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* Parameters: jpeg_header_data - a JPEG header data array in the same format
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* as from get_jpeg_header_data
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*
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* Returns: App12_Head - The text preceeding the Picture Info (often
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* the camera manufacturer's name)
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* App12_Text - The Picture Info Text
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* FALSE, FALSE - if an APP 12 Picture Info segment could not be found
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*
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******************************************************************************/
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function get_jpeg_App12_Pic_Info( $jpeg_header_data )
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{
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// Flag that an APP12 segment has not been found yet
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$App12_PI_Location = -1;
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//Cycle through the header segments
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for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
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{
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// Check if we have found an APP12 header,
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if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP12" ) == 0 )
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{
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// Found an APP12 segment
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// Check if the APP12 has one of the correct labels (headers)
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// for a picture info segment
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if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "[picture info]", 14) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "SEIKO EPSON CORP. \00", 20) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "Agfa Gevaert \x00", 16) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "SanyoElectricDSC\x00", 17) == 0 ) ||
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( strncmp ( substr($jpeg_header_data[$i]['SegData'],1,3), "\x00\x00\x00", 3) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "Type=", 5) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 ) )
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{
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// A Picture Info segment was found, mark this position
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$App12_PI_Location = $i;
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}
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}
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}
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// Check if a Picture Info Segment was found
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if ( $App12_PI_Location != -1 )
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{
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// A picture Info Segment was found - Process it
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// Determine the length of the header if there is one
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$head_length = 0;
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if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "App12 Gevaert \x00", 16) == 0 )
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{
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$head_length = 16;
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}
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else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 )
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{
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$head_length = 25;
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}
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else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "SEIKO EPSON CORP. \00", 20) == 0 )
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{
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$head_length = 20;
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}
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else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 )
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{
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$head_length = 5;
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}
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else if ( strncmp ( substr($jpeg_header_data[$App12_PI_Location]['SegData'],1,3), "\x00\x00\x00", 3) == 0 ) // HP
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{
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$head_length = 0;
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}
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else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "SanyoElectricDSC\x00", 17) == 0 )
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{
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$head_length = 17;
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}
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else
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{
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$head_length = 0;
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}
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// Extract the header and the Picture Info Text from the APP12 segment
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$App12_PI_Head = substr( $jpeg_header_data[$App12_PI_Location]['SegData'], 0, $head_length );
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$App12_PI_Text = substr( $jpeg_header_data[$App12_PI_Location]['SegData'], $head_length );
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// Return the text which was extracted
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if ( ($pos = strpos ( $App12_PI_Text, "[end]" ) ) !== FALSE )
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{
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return array( "Header" => $App12_PI_Head, "Picture Info" => substr( $App12_PI_Text, 0, $pos + 5 ) );
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}
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else
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{
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return array( "Header" => $App12_PI_Head, "Picture Info" => $App12_PI_Text );
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}
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}
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// No Picture Info Segment Found - Return False
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return array( FALSE, FALSE );
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}
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/******************************************************************************
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* End of Function: get_jpeg_header_data
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******************************************************************************/
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/******************************************************************************
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*
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* Function: put_jpeg_App12_Pic_Info
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*
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* Description: Writes Picture Info text into an App12 JPEG segment. Uses information
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* supplied by the get_jpeg_header_data function. If no App12 exists
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* already a new one is created, otherwise it replaces the old one
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*
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* Parameters: jpeg_header_data - a JPEG header data array in the same format
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* as from get_jpeg_header_data
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* new_Pic_Info_Text - The Picture Info Text, including any header
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* that is required
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*
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* Returns: jpeg_header_data - the JPEG header array with the new Picture
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* info segment inserted
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* FALSE - if an error occured
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*
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******************************************************************************/
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function put_jpeg_App12_Pic_Info( $jpeg_header_data, $new_Pic_Info_Text )
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{
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//Cycle through the header segments
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for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
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{
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// Check if we have found an APP12 header,
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if ( strcmp ( $jpeg_header_data[$i][SegName], "APP12" ) == 0 )
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{
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// Found an APP12 segment
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// Check if the APP12 has one of the correct labels (headers)
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// for a picture info segment
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if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "[picture info]", 14) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "SEIKO EPSON CORP. \x00", 20) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "Agfa Gevaert \x00", 16) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "SanyoElectricDSC\x00", 17) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "Type=", 5) == 0 ) ||
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( strncmp ( $jpeg_header_data[$i]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 ) )
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{
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// Found a preexisting Picture Info segment - Replace it with the new one and return.
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$jpeg_header_data[$i][SegData] = $new_Pic_Info_Text;
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return $jpeg_header_data;
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}
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}
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}
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// No preexisting Picture Info segment found, insert a new one at the start of the header data.
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// Determine highest position of an APP segment at or below APP12, so we can put the
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// new APP12 at this position
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$highest_APP = -1;
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//Cycle through the header segments
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for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
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{
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// Check if we have found an APP segment at or below APP12,
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if ( ( $jpeg_header_data[$i]['SegType'] >= 0xE0 ) && ( $jpeg_header_data[$i]['SegType'] <= 0xEC ) )
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{
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// Found an APP segment at or below APP12
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$highest_APP = $i;
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}
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}
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// Insert the new Picture Info segment
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array_splice($jpeg_header_data, $highest_APP + 1 , 0, array( array( "SegType" => 0xEC,
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"SegName" => "APP12",
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"SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xEC ],
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"SegData" => $new_Pic_Info_Text ) ) );
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return $jpeg_header_data;
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}
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/******************************************************************************
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* End of Function: put_jpeg_header_data
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******************************************************************************/
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/******************************************************************************
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*
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* Function: Interpret_App12_Pic_Info_to_HTML
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*
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* Description: Generates html showing the contents of any JPEG App12 Picture
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* Info segment
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*
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* Parameters: jpeg_header_data - the JPEG header data, as retrieved
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* from the get_jpeg_header_data function
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*
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* Returns: output - the HTML
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*
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******************************************************************************/
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function Interpret_App12_Pic_Info_to_HTML( $jpeg_header_data )
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{
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// Create a string to receive the output
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$output = "";
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// read the App12 Picture Info segment
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$PI = get_jpeg_App12_Pic_Info( $jpeg_header_data );
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// Check if the Picture Info segment was valid
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if ( $PI !== array(FALSE, FALSE) )
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{
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// Picture Info exists - add it to the output
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$output .= "<h2 class=\"Picture_Info_Main_Heading\">Picture Info Text</h2>\n";
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$output .= "<p><span class=\"Picture_Info_Caption_Text\">Header: </span><span class=\"Picture_Info_Value_Text\">" . HTML_UTF8_Escape( $PI['Header'] ) . "</span></p>\n";
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$output .= "<p class=\"Picture_Info_Caption_Text\">Picture Info Text:</p><pre class=\"Picture_Info_Value_Text\">" . HTML_UTF8_Escape( $PI['Picture Info'] ) . "</pre>\n";
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}
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// Return the result
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return $output;
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}
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/******************************************************************************
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* End of Function: Interpret_App12_Pic_Info_to_HTML
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******************************************************************************/
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?>
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