exif.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:     EXIF.php
*
* Description:  Provides functions for reading and writing EXIF Information
*               to/from an APP1 segment of a JPEG file
*               Unfortunately, because EXIF data may be distributed anywhere
*               throughout an image file, rather than just being in one block,
*               it is impossible to pass just a string containing only the EXIF
*               information. Hence it is neccessary to be able to seek to
*               any point in the file. This causes the HTTP and FTP wrappers
*               not to work - i.e. the EXIF functions will only work with local
*               files.
*               To work on an internet file, copy it locally to start with:
*
*               $newfilename = tempnam ( $dir, "tmpexif" );
*               copy ( "http://whatever.com", $newfilename );
*
*
* Author:       Evan Hunter
*
* Date:         30/7/2004
*
* Project:      PHP JPEG Metadata Toolkit
*
* Revision:     1.11
*
* Changes:      1.00 -> 1.10 : added function get_EXIF_TIFF to allow extracting EXIF from a TIFF file
*               1.10 -> 1.11 : added functionality to allow decoding of XMP and Photoshop IRB information
*                              embedded within the EXIF data
*                              added checks for http and ftp wrappers, as these are not supported
*                              changed interpret_IFD 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]
*
******************************************************************************/


// TODO : Thoroughly test the functions for writing EXIF segments
// TODO : Figure out a way to allow EXIF to function normally with HTTP and FTP wrappers
// TODO : Implement EXIF decoding of Device Setting Description field
// TODO : Implement EXIF decoding of SpatialFrequencyResponse field
// TODO : Implement EXIF decoding of OECF field
// TODO : Implement EXIF decoding of SubjectArea field
// TODO : Add a put_EXIF_TIFF function

/******************************************************************************
*
* Initialisation
*
******************************************************************************/


if ( !isset( $GLOBALS['HIDE_UNKNOWN_TAGS'] ) )     $GLOBALS['HIDE_UNKNOWN_TAGS']= FALSE;
if ( !isset( $GLOBALS['SHOW_BINARY_DATA_HEX'] ) )  $GLOBALS['SHOW_BINARY_DATA_HEX'] = FALSE;
if ( !isset( $GLOBALS['SHOW_BINARY_DATA_TEXT'] ) ) $GLOBALS['SHOW_BINARY_DATA_TEXT'] = FALSE;


include_once 'EXIF_Tags.php';
include_once 'EXIF_Makernote.php';
include_once 'PIM.php';
include_once 'Unicode.php';
include_once 'JPEG.php';
include_once 'IPTC.php';
include_once 'Photoshop_IRB.php';       // Change: as of version 1.11  - Required for TIFF with embedded IRB
include_once 'XMP.php';                 // Change: as of version 1.11  - Required for TIFF with embedded XMP
include_once 'pjmt_utils.php';          // Change: as of version 1.11  - Required for directory portability








/******************************************************************************
*
* Function:     get_EXIF_JPEG
*
* Description:  Retrieves information from a Exchangeable Image File Format (EXIF)
*               APP1 segment and returns it in an array.
*
* Parameters:   filename - the filename of the JPEG image to process
*
* Returns:      OutputArray - Array of EXIF records
*               FALSE - If an error occured in decoding
*
******************************************************************************/

function get_EXIF_JPEG( $filename )
{
        // Change: Added as of version 1.11
        // Check if a wrapper is being used - these are not currently supported (see notes at top of file)
        if ( ( stristr ( $filename, "http://" ) != FALSE ) || ( stristr ( $filename, "ftp://" ) != FALSE ) )
        {
                // A HTTP or FTP wrapper is being used - show a warning and abort
                echo "HTTP and FTP wrappers are currently not supported with EXIF - See EXIF functionality documentation - a local file must be specified<br>";
                echo "To work on an internet file, copy it locally to start with:<br><br>\n";
                echo "\$newfilename = tempnam ( \$dir, \"tmpexif\" );<br>\n";
                echo "copy ( \"http://whatever.com\", \$newfilename );<br><br>\n";
                return FALSE;
        }

        // get the JPEG headers
        $jpeg_header_data = get_jpeg_header_data( $filename );


        // Flag that an EXIF segment has not been found yet
        $EXIF_Location = -1;

        //Cycle through the header segments
        for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
        {
                // If we find an APP1 header,
                if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP1" ) == 0 )
                {
                        // And if it has the EXIF label,
                        if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\x00", 6) == 0 ) ||
                             ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\xFF", 6) == 0 ) )          // For some reason, some files have a faulty EXIF name which has a 0xFF in it
                        {
                                // Save the location of the EXIF segment
                                $EXIF_Location = $i;
                        }
                }

        }

        // Check if an EXIF segment was found
        if ( $EXIF_Location == -1 )
        {
                // Couldn't find any EXIF block to decode
                return FALSE;
        }

        $filehnd = @fopen($filename, 'rb');

        // Check if the file opened successfully
        if ( ! $filehnd  )
        {
                // Could't open the file - exit
                echo "<p>Could not open file $filename</p>\n";
                return FALSE;
        }

        fseek( $filehnd, $jpeg_header_data[$EXIF_Location]['SegDataStart'] + 6  );

        // Decode the Exif segment into an array and return it
        $exif_data = process_TIFF_Header( $filehnd, "TIFF" );



        // Close File
        fclose($filehnd);
        return $exif_data;
}

/******************************************************************************
* End of Function:     get_EXIF_JPEG
******************************************************************************/



/******************************************************************************
*
* Function:     put_EXIF_JPEG
*
* Description:  Stores information into a Exchangeable Image File Format (EXIF)
*               APP1 segment from an EXIF array.
*
*               WARNING: Because the EXIF standard allows pointers to data
*               outside the APP1 segment, if there are any such pointers in
*               a makernote, this function will DAMAGE them since it will not
*               be aware that there is an external pointer. This will often
*               happen with Makernotes that include an embedded thumbnail.
*               This damage could be prevented where makernotes can be decoded,
*               but currently this is not implemented.
*
*
* Parameters:   exif_data - The array of EXIF data to insert into the JPEG header
*               jpeg_header_data - The JPEG header into which the EXIF data
*                                  should be stored, as from get_jpeg_header_data
*
* Returns:      jpeg_header_data - JPEG header array with the EXIF segment inserted
*               FALSE - If an error occured
*
******************************************************************************/

function put_EXIF_JPEG( $exif_data, $jpeg_header_data )
{
        // pack the EXIF data into its proper format for a JPEG file
        $packed_data = get_TIFF_Packed_Data( $exif_data );
        if ( $packed_data === FALSE )
        {
                return $jpeg_header_data;
        }

        $packed_data = "Exif\x00\x00$packed_data";

        //Cycle through the header segments
        for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
        {
                // If we find an APP1 header,
                if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP1" ) == 0 )
                {
                        // And if it has the EXIF label,
                        if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\x00", 6) == 0 ) ||
                             ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\xFF", 6) == 0 ) )          // For some reason, some files have a faulty EXIF name which has a 0xFF in it
                        {
                                // Found a preexisting EXIF block - Replace it with the new one and return.
                                $jpeg_header_data[$i]['SegData'] = $packed_data;
                                return $jpeg_header_data;
                        }
                }
        }

        // No preexisting segment segment found, insert a new one at the start of the header data.

        // Determine highest position of an APP segment at or below APP3, so we can put the
        // new APP3 at this position


        $highest_APP = -1;

        //Cycle through the header segments
        for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
        {
                // Check if we have found an APP segment at or below APP3,
                if ( ( $jpeg_header_data[$i]['SegType'] >= 0xE0 ) && ( $jpeg_header_data[$i]['SegType'] <= 0xE3 ) )
                {
                        // Found an APP segment at or below APP12
                        $highest_APP = $i;
                }
        }

        // No preexisting EXIF block found, insert a new one at the start of the header data.
        array_splice($jpeg_header_data, $highest_APP + 1 , 0, array( array(   "SegType" => 0xE1,
                                                                              "SegName" => "APP1",
                                                                              "SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xE1 ],
                                                                              "SegData" => $packed_data ) ) );
        return $jpeg_header_data;

}

/******************************************************************************
* End of Function:     put_EXIF_JPEG
******************************************************************************/




/******************************************************************************
*
* Function:     get_Meta_JPEG
*
* Description:  Retrieves information from a Meta APP3 segment and returns it
*               in an array. Uses information supplied by the
*               get_jpeg_header_data function.
*               The Meta segment has the same format as an EXIF segment, but
*               uses different tags
*
* Parameters:   filename - the filename of the JPEG image to process
*
* Returns:      OutputArray - Array of Meta records
*               FALSE - If an error occured in decoding
*
******************************************************************************/

function get_Meta_JPEG( $filename )
{
        // Change: Added as of version 1.11
        // Check if a wrapper is being used - these are not currently supported (see notes at top of file)
        if ( ( stristr ( $filename, "http://" ) != FALSE ) || ( stristr ( $filename, "ftp://" ) != FALSE ) )
        {
                // A HTTP or FTP wrapper is being used - show a warning and abort
                echo "HTTP and FTP wrappers are currently not supported with Meta - See EXIF/Meta functionality documentation - a local file must be specified<br>";
                echo "To work on an internet file, copy it locally to start with:<br><br>\n";