photoshop_irb.php

CMS系统 提供学习研究修改最好了 比流行的一些CMS简单 但是更容易理解 是帮助你学习PHPCMS系统的好东东哦

<?php

/******************************************************************************
*
* Filename:     Photoshop_IRB.php
*
* Description:  Provides functions for reading and writing information to/from
*               the 'App 13' Photoshop Information Resource Block segment of
*               JPEG format files
*
* Author:       Evan Hunter
*
* Date:         23/7/2004
*
* Project:      PHP JPEG Metadata Toolkit
*
* Revision:     1.11
*
* Changes:      1.00 -> 1.02 : changed get_Photoshop_IRB to work with corrupted
*                              resource names which Photoshop can still read
*               1.02 -> 1.03 : Fixed put_Photoshop_IRB to output "Photoshop 3.0\x00"
*                              string with every APP13 segment, not just the first one
*               1.03 -> 1.10 : changed get_Photoshop_IRB to fix processing of embedded resource names,
*                              after discovering that Photoshop does not process
*                              resource names according to the standard :
*                              "Adobe Photoshop 6.0 File Formats Specification, Version 6.0, Release 2, November 2000"
*                              This is an update to the change 1.00 -> 1.02, which was not fully correct
*                              changed put_Photoshop_IRB to fix the writing of embedded resource name,
*                              to avoid creating blank resources, and to fix a problem
*                              causing the IRB block to be incorrectly positioned if no APP segments existed.
*                              changed get_Photoshop_IPTC to initialise the output array correctly.
*               1.10 -> 1.11 : Moved code out of get_Photoshop_IRB into new function unpack_Photoshop_IRB_Data
*                              to allow reading of IRB blocks embedded within EXIF (for TIFF Files)
*                              Moved code out of put_Photoshop_IRB into new function pack_Photoshop_IRB_Data
*                              to allow writing of IRB blocks embedded within EXIF (for TIFF Files)
*                              Enabled the usage of $GLOBALS['HIDE_UNKNOWN_TAGS'] to hide unknown resources
*                              changed Interpret_IRB_to_HTML to allow thumbnail links to work when
*                              toolkit is portable across directories
*
*
* URL:          http://electronics.ozhiker.com
*
* Copyright:    Copyright Evan Hunter 2004
*
* License:      This file is part of the PHP JPEG Metadata Toolkit.
*
*               The PHP JPEG Metadata Toolkit is free software; you can
*               redistribute it and/or modify it under the terms of the
*               GNU General Public License as published by the Free Software
*               Foundation; either version 2 of the License, or (at your
*               option) any later version.
*
*               The PHP JPEG Metadata Toolkit is distributed in the hope
*               that it will be useful, but WITHOUT ANY WARRANTY; without
*               even the implied warranty of MERCHANTABILITY or FITNESS
*               FOR A PARTICULAR PURPOSE.  See the GNU General Public License
*               for more details.
*
*               You should have received a copy of the GNU General Public
*               License along with the PHP JPEG Metadata Toolkit; if not,
*               write to the Free Software Foundation, Inc., 59 Temple
*               Place, Suite 330, Boston, MA  02111-1307  USA
*
*               If you require a different license for commercial or other
*               purposes, please contact the author: [e-mail]
*
******************************************************************************/

// Change: as of version 1.11 - added to ensure the HIDE_UNKNOWN_TAGS variable is set even if EXIF.php is not included
if ( !isset( $GLOBALS['HIDE_UNKNOWN_TAGS'] ) )     $GLOBALS['HIDE_UNKNOWN_TAGS']= FALSE;

include_once 'IPTC.php';
include_once 'Unicode.php';



// TODO: Many Photoshop IRB resources not interpeted
// TODO: Obtain a copy of the Photoshop CS File Format Specification
// TODO: Find out what Photoshop IRB resources 1061, 1062 & 1064 are
// TODO: Test get_Photoshop_IRB and put_Photoshop_IRB with multiple APP13 segments

/******************************************************************************
*
* Function:     get_Photoshop_IRB
*
* Description:  Retrieves the Photoshop Information Resource Block (IRB) information
*               from an App13 JPEG segment and returns it as an array. This may
*               include IPTC-NAA IIM Information. Uses information
*               supplied by the get_jpeg_header_data function
*
* Parameters:   jpeg_header_data - a JPEG header data array in the same format
*                                  as from get_jpeg_header_data
*
* Returns:      IRBdata - The array of Photoshop IRB records
*               FALSE - if an APP 13 Photoshop IRB segment could not be found,
*                       or if an error occured
*
******************************************************************************/

function get_Photoshop_IRB( $jpeg_header_data )
{
        // Photoshop Image Resource blocks can span several JPEG APP13 segments, so we need to join them up if there are more than one
        $joined_IRB = "";


        //Cycle through the header segments
        for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
        {
                // If we find an APP13 header,
                if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP13" ) == 0 )
                {
                        // And if it has the photoshop label,
                        if( strncmp ( $jpeg_header_data[$i]['SegData'], "Photoshop 3.0\x00", 14) == 0 )
                        {
                                // join it to the other previous IRB data
                                $joined_IRB .= substr ( $jpeg_header_data[$i]['SegData'], 14 );
                        }
                }
        }

        // If there was some Photoshop IRB information found,
        if ( $joined_IRB != "" )
        {
                // Found a Photoshop Image Resource Block - extract it.
                // Change: Moved code into unpack_Photoshop_IRB_Data to allow TIFF reading as of 1.11
                return unpack_Photoshop_IRB_Data( $joined_IRB );

        }
        else
        {
                // No Photoshop IRB found
                return FALSE;
        }

}

/******************************************************************************
* End of Function:     get_Photoshop_IRB
******************************************************************************/










/******************************************************************************
*
* Function:     put_Photoshop_IRB
*
* Description:  Adds or modifies the Photoshop Information Resource Block (IRB)
*               information from an App13 JPEG segment. If a Photoshop IRB already
*               exists, it is replaced, otherwise a new one is inserted, using the
*               supplied data. Uses information supplied by the get_jpeg_header_data
*               function
*
* Parameters:   jpeg_header_data - a JPEG header data array in the same format
*                                  as from get_jpeg_header_data
*               new_IRB_data - an array of the data to be stored in the Photoshop
*                              IRB segment. Should be in the same format as received
*                              from get_Photoshop_IRB
*
* Returns:      jpeg_header_data - the JPEG header data array with the
*                                  Photoshop IRB added.
*               FALSE - if an error occured
*
******************************************************************************/

function put_Photoshop_IRB( $jpeg_header_data, $new_IRB_data )
{
        // Delete all existing Photoshop IRB blocks - the new one will replace them

        //Cycle through the header segments
        for( $i = 0; $i < count( $jpeg_header_data ) ; $i++ )
        {
                // If we find an APP13 header,
                if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP13" ) == 0 )
                {
                        // And if it has the photoshop label,
                        if( strncmp ( $jpeg_header_data[$i]['SegData'], "Photoshop 3.0\x00", 14) == 0 )
                        {
                                // Delete the block information - it needs to be rebuilt
                                array_splice( $jpeg_header_data, $i, 1 );
                        }
                }
        }


        // Now we have deleted the pre-existing blocks


        // Retrieve the Packed Photoshop IRB Data
        // Change: Moved code into pack_Photoshop_IRB_Data to allow TIFF writing as of 1.11
        $packed_IRB_data = pack_Photoshop_IRB_Data( $new_IRB_data );

        // Change : This section changed to fix incorrect positioning of IRB segment, as of revision 1.10
        //          when there are no APP segments present

        //Cycle through the header segments in reverse order (to find where to put the APP13 block - after any APP0 to APP12 blocks)
        $i = count( $jpeg_header_data ) - 1;
        while (( $i >= 0 ) && ( ( $jpeg_header_data[$i]['SegType'] > 0xED ) || ( $jpeg_header_data[$i]['SegType'] < 0xE0 ) ) )
        {
                $i--;
        }



        // Cycle through the packed output data until it's size is less than 32000 bytes, outputting each 32000 byte block to an APP13 segment
        while ( strlen( $packed_IRB_data ) > 32000 )
        {
                // Change: Fixed put_Photoshop_IRB to output "Photoshop 3.0\x00" string with every APP13 segment, not just the first one, as of 1.03

                // Write a 32000 byte APP13 segment
                array_splice($jpeg_header_data, $i +1  , 0, array(  "SegType" => 0xED,
                                                                "SegName" => "APP13",
                                                                "SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xED ],
                                                                "SegData" => "Photoshop 3.0\x00" . substr( $packed_IRB_data,0,32000) ) );

                // Delete the 32000 bytes from the packed output data, that were just output
                $packed_IRB_data = substr_replace($packed_IRB_data, '', 0, 32000);
                $i++;
        }

        // Write the last block of packed output data to an APP13 segment - Note array_splice doesn't work with multidimensional arrays, hence inserting a blank string