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<?php
/**
* PEL: PHP Exif Library. A library with support for reading and
* writing all Exif headers in JPEG and TIFF images using PHP.
*
* Copyright (C) 2004, 2005, 2006, 2007 Martin Geisler.
*
* This program 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.
*
* This program 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 this program in the file COPYING; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/* $Id$ */
/**
* Classes used to hold bytes, both signed and unsigned. The {@link
* PelEntryWindowsString} class is used to manipulate strings in the
* format Windows XP needs.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @version $Revision$
* @date $Date$
* @license http://www.gnu.org/licenses/gpl.html GNU General Public
* License (GPL)
* @package PEL
*/
/**#@+ Required class definitions. */
require_once('PelEntryNumber.php');
/**#@-*/
/**
* Class for holding unsigned bytes.
*
* This class can hold bytes, either just a single byte or an array of
* bytes. The class will be used to manipulate any of the Exif tags
* which has format {@link PelFormat::BYTE}.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntryByte extends PelEntryNumber {
/**
* Make a new entry that can hold an unsigned byte.
*
* The method accept several integer arguments. The {@link
* getValue} method will always return an array except for when a
* single integer argument is given here.
*
* @param PelTag the tag which this entry represents. This
* should be one of the constants defined in {@link PelTag}
* which has format {@link PelFormat::BYTE}.
*
* @param int $value... the byte(s) that this entry will represent.
* The argument passed must obey the same rules as the argument to
* {@link setValue}, namely that it should be within range of an
* unsigned byte, that is between 0 and 255 (inclusive). If not,
* then a {@link PelOverflowException} will be thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->min = 0;
$this->max = 255;
$this->format = PelFormat::BYTE;
$value = func_get_args();
array_shift($value);
$this->setValueArray($value);
}
/**
* Convert a number into bytes.
*
* @param int the number that should be converted.
*
* @param PelByteOrder one of {@link PelConvert::LITTLE_ENDIAN} and
* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
*
* @return string bytes representing the number given.
*/
function numberToBytes($number, $order) {
return chr($number);
}
}
/**
* Class for holding signed bytes.
*
* This class can hold bytes, either just a single byte or an array of
* bytes. The class will be used to manipulate any of the Exif tags
* which has format {@link PelFormat::BYTE}.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntrySByte extends PelEntryNumber {
/**
* Make a new entry that can hold a signed byte.
*
* The method accept several integer arguments. The {@link getValue}
* method will always return an array except for when a single
* integer argument is given here.
*
* @param PelTag the tag which this entry represents. This
* should be one of the constants defined in {@link PelTag}
* which has format {@link PelFormat::BYTE}.
*
* @param int $value... the byte(s) that this entry will represent.
* The argument passed must obey the same rules as the argument to
* {@link setValue}, namely that it should be within range of a
* signed byte, that is between -128 and 127 (inclusive). If not,
* then a {@link PelOverflowException} will be thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->min = -128;
$this->max = 127;
$this->format = PelFormat::SBYTE;
$value = func_get_args();
array_shift($value);
$this->setValueArray($value);
}
/**
* Convert a number into bytes.
*
* @param int the number that should be converted.
*
* @param PelByteOrder one of {@link PelConvert::LITTLE_ENDIAN} and
* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
*
* @return string bytes representing the number given.
*/
function numberToBytes($number, $order) {
return chr($number);
}
}
/**
* Class used to manipulate strings in the format Windows XP uses.
*
* When examining the file properties of an image in Windows XP one
* can fill in title, comment, author, keyword, and subject fields.
* Filling those fields and pressing OK will result in the data being
* written into the Exif data in the image.
*
* The data is written in a non-standard format and can thus not be
* loaded directly --- this class is needed to translate it into
* normal strings.
*
* It is important that entries from this class are only created with
* the {@link PelTag::XP_TITLE}, {@link PelTag::XP_COMMENT}, {@link
* PelTag::XP_AUTHOR}, {@link PelTag::XP_KEYWORD}, and {@link
* PelTag::XP_SUBJECT} tags. If another tag is used the data will no
* longer be correctly decoded when reloaded with PEL. (The data will
* be loaded as an {@link PelEntryByte} entry, which isn't as useful.)
*
* This class is to be used as in
* <code>
* $title = $ifd->getEntry(PelTag::XP_TITLE);
* print($title->getValue());
* $title->setValue('My favorite cat');
* </code>
* or if no entry is present one can add a new one with
* <code>
* $title = new PelEntryWindowsString(PelTag::XP_TITLE, 'A cute dog.');
* $ifd->addEntry($title);
* </code>
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntryWindowsString extends PelEntry {
/**
* The string hold by this entry.
*
* This is the string that was given to the {@link __construct
* constructor} or later to {@link setValue}, without any extra NULL
* characters or any such nonsense.
*
* @var string
*/
private $str;
/**
* Make a new PelEntry that can hold a Windows XP specific string.
*
* @param int the tag which this entry represents. This should be
* one of {@link PelTag::XP_TITLE}, {@link PelTag::XP_COMMENT},
* {@link PelTag::XP_AUTHOR}, {@link PelTag::XP_KEYWORD}, and {@link
* PelTag::XP_SUBJECT} tags. If another tag is used, then this
* entry will be incorrectly reloaded as a {@link PelEntryByte}.
*
* @param string the string that this entry will represent. It will
* be passed to {@link setValue} and thus has to obey its
* requirements.
*/
function __construct($tag, $str = '') {
$this->tag = $tag;
$this->format = PelFormat::BYTE;
$this->setValue($str);
}
/**
* Give the entry a new value.
*
* This will overwrite the previous value. The value can be
* retrieved later with the {@link getValue} method.
*
* @param string the new value of the entry. This should be use the
* Latin-1 encoding and be given without any extra NULL characters.
*/
function setValue($str) {
$l = strlen($str);
$this->components = 2 * ($l + 1);
$this->str = $str;
$this->bytes = '';
for ($i = 0; $i < $l; $i++)
$this->bytes .= $str{$i} . chr(0x00);
$this->bytes .= chr(0x00) . chr(0x00);
}
/**
* Return the string of the entry.
*
* @return string the string held, without any extra NULL
* characters. The string will be the same as the one given to
* {@link setValue} or to the {@link __construct constructor}.
*/
function getValue() {
return $this->str;
}
/**
* Return the string of the entry.
*
* This methods returns the same as {@link getValue}.
*
* @param boolean not used.
*
* @return string the string held, without any extra NULL
* characters. The string will be the same as the one given to
* {@link setValue} or to the {@link __construct constructor}.
*/
function getText($brief = false) {
return $this->str;
}
}
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