📄 pictureinfo.php
字号:
<?php
/******************************************************************************
*
* Filename: PictureInfo.php
*
* Description: Provides functions for reading and writing information to/from
* the 'App 12' Picture Info segment of JPEG format files
*
* Author: Evan Hunter
*
* Date: 23/7/2004
*
* Project: PHP JPEG Metadata Toolkit
*
* Revision: 1.00
*
* 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: evan@ozhiker.com
*
******************************************************************************/
include_once 'Unicode.php';
/******************************************************************************
*
* Function: get_jpeg_App12_Pic_Info
*
* Description: Retrieves the Picture Info text information from an App12
* JPEG segment and returns it as a string. 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: App12_Head - The text preceeding the Picture Info (often
* the camera manufacturer's name)
* App12_Text - The Picture Info Text
* FALSE, FALSE - if an APP 12 Picture Info segment could not be found
*
******************************************************************************/
function get_jpeg_App12_Pic_Info( $jpeg_header_data )
{
// Flag that an APP12 segment has not been found yet
$App12_PI_Location = -1;
//Cycle through the header segments
for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
{
// Check if we have found an APP12 header,
if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP12" ) == 0 )
{
// Found an APP12 segment
// Check if the APP12 has one of the correct labels (headers)
// for a picture info segment
if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "[picture info]", 14) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "SEIKO EPSON CORP. \00", 20) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "Agfa Gevaert \x00", 16) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "SanyoElectricDSC\x00", 17) == 0 ) ||
( strncmp ( substr($jpeg_header_data[$i]['SegData'],1,3), "\x00\x00\x00", 3) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "Type=", 5) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 ) )
{
// A Picture Info segment was found, mark this position
$App12_PI_Location = $i;
}
}
}
// Check if a Picture Info Segment was found
if ( $App12_PI_Location != -1 )
{
// A picture Info Segment was found - Process it
// Determine the length of the header if there is one
$head_length = 0;
if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "App12 Gevaert \x00", 16) == 0 )
{
$head_length = 16;
}
else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 )
{
$head_length = 25;
}
else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "SEIKO EPSON CORP. \00", 20) == 0 )
{
$head_length = 20;
}
else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 )
{
$head_length = 5;
}
else if ( strncmp ( substr($jpeg_header_data[$App12_PI_Location]['SegData'],1,3), "\x00\x00\x00", 3) == 0 ) // HP
{
$head_length = 0;
}
else if ( strncmp ( $jpeg_header_data[$App12_PI_Location]['SegData'], "SanyoElectricDSC\x00", 17) == 0 )
{
$head_length = 17;
}
else
{
$head_length = 0;
}
// Extract the header and the Picture Info Text from the APP12 segment
$App12_PI_Head = substr( $jpeg_header_data[$App12_PI_Location]['SegData'], 0, $head_length );
$App12_PI_Text = substr( $jpeg_header_data[$App12_PI_Location]['SegData'], $head_length );
// Return the text which was extracted
if ( ($pos = strpos ( $App12_PI_Text, "[end]" ) ) !== FALSE )
{
return array( "Header" => $App12_PI_Head, "Picture Info" => substr( $App12_PI_Text, 0, $pos + 5 ) );
}
else
{
return array( "Header" => $App12_PI_Head, "Picture Info" => $App12_PI_Text );
}
}
// No Picture Info Segment Found - Return False
return array( FALSE, FALSE );
}
/******************************************************************************
* End of Function: get_jpeg_header_data
******************************************************************************/
/******************************************************************************
*
* Function: put_jpeg_App12_Pic_Info
*
* Description: Writes Picture Info text into an App12 JPEG segment. Uses information
* supplied by the get_jpeg_header_data function. If no App12 exists
* already a new one is created, otherwise it replaces the old one
*
* Parameters: jpeg_header_data - a JPEG header data array in the same format
* as from get_jpeg_header_data
* new_Pic_Info_Text - The Picture Info Text, including any header
* that is required
*
* Returns: jpeg_header_data - the JPEG header array with the new Picture
* info segment inserted
* FALSE - if an error occured
*
******************************************************************************/
function put_jpeg_App12_Pic_Info( $jpeg_header_data, $new_Pic_Info_Text )
{
//Cycle through the header segments
for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
{
// Check if we have found an APP12 header,
if ( strcmp ( $jpeg_header_data[$i][SegName], "APP12" ) == 0 )
{
// Found an APP12 segment
// Check if the APP12 has one of the correct labels (headers)
// for a picture info segment
if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "[picture info]", 14) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "SEIKO EPSON CORP. \x00", 20) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "Agfa Gevaert \x00", 16) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "SanyoElectricDSC\x00", 17) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "Type=", 5) == 0 ) ||
( strncmp ( $jpeg_header_data[$i]['SegData'], "OLYMPUS OPTICAL CO.,LTD.", 24) == 0 ) )
{
// Found a preexisting Picture Info segment - Replace it with the new one and return.
$jpeg_header_data[$i][SegData] = $new_Pic_Info_Text;
return $jpeg_header_data;
}
}
}
// No preexisting Picture Info segment found, insert a new one at the start of the header data.
// Determine highest position of an APP segment at or below APP12, so we can put the
// new APP12 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 APP12,
if ( ( $jpeg_header_data[$i]['SegType'] >= 0xE0 ) && ( $jpeg_header_data[$i]['SegType'] <= 0xEC ) )
{
// Found an APP segment at or below APP12
$highest_APP = $i;
}
}
// Insert the new Picture Info segment
array_splice($jpeg_header_data, $highest_APP + 1 , 0, array( array( "SegType" => 0xEC,
"SegName" => "APP12",
"SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xEC ],
"SegData" => $new_Pic_Info_Text ) ) );
return $jpeg_header_data;
}
/******************************************************************************
* End of Function: put_jpeg_header_data
******************************************************************************/
/******************************************************************************
*
* Function: Interpret_App12_Pic_Info_to_HTML
*
* Description: Generates html showing the contents of any JPEG App12 Picture
* Info segment
*
* Parameters: jpeg_header_data - the JPEG header data, as retrieved
* from the get_jpeg_header_data function
*
* Returns: output - the HTML
*
******************************************************************************/
function Interpret_App12_Pic_Info_to_HTML( $jpeg_header_data )
{
// Create a string to receive the output
$output = "";
// read the App12 Picture Info segment
$PI = get_jpeg_App12_Pic_Info( $jpeg_header_data );
// Check if the Picture Info segment was valid
if ( $PI !== array(FALSE, FALSE) )
{
// Picture Info exists - add it to the output
$output .= "<h2 class=\"Picture_Info_Main_Heading\">Picture Info Text</h2>\n";
$output .= "<p><span class=\"Picture_Info_Caption_Text\">Header: </span><span class=\"Picture_Info_Value_Text\">" . HTML_UTF8_Escape( $PI['Header'] ) . "</span></p>\n";
$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";
}
// Return the result
return $output;
}
/******************************************************************************
* End of Function: Interpret_App12_Pic_Info_to_HTML
******************************************************************************/
?>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -