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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 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 longs, both signed and unsigned.
*
* @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 longs.
*
* This class can hold longs, either just a single long or an array of
* longs. The class will be used to manipulate any of the Exif tags
* which can have format {@link PelFormat::LONG} like in this
* example:
* <code>
* $w = $ifd->getEntry(PelTag::EXIF_IMAGE_WIDTH);
* $w->setValue($w->getValue() / 2);
* $h = $ifd->getEntry(PelTag::EXIF_IMAGE_HEIGHT);
* $h->setValue($h->getValue() / 2);
* </code>
* Here the width and height is updated to 50% of their original
* values.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntryLong extends PelEntryNumber {
/**
* Make a new entry that can hold an unsigned long.
*
* The method accept its arguments in two forms: several integer
* arguments or a single array argument. The {@link getValue}
* method will always return an array except for when a single
* integer argument is given here, or when an array with just a
* single integer is given.
*
* This means that one can conveniently use objects like this:
* <code>
* $a = new PelEntryLong(PelTag::EXIF_IMAGE_WIDTH, 123456);
* $b = $a->getValue() - 654321;
* </code>
* where the call to {@link getValue} will return an integer instead
* of an array with one integer element, which would then have to be
* extracted.
*
* @param PelTag the tag which this entry represents. This
* should be one of the constants defined in {@link PelTag},
* e.g., {@link PelTag::IMAGE_WIDTH}, or any other tag which can
* have format {@link PelFormat::LONG}.
*
* @param int $value... the long(s) that this entry will
* represent or an array of longs. The argument passed must obey
* the same rules as the argument to {@link setValue}, namely that
* it should be within range of an unsigned long (32 bit), that is
* between 0 and 4294967295 (inclusive). If not, then a {@link
* PelExifOverflowException} will be thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->min = 0;
$this->max = 4294967295;
$this->format = PelFormat::LONG;
$value = func_get_args();
array_shift($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, $order) {
return PelConvert::longToBytes($number, $order);
}
}
/**
* Class for holding signed longs.
*
* This class can hold longs, either just a single long or an array of
* longs. The class will be used to manipulate any of the Exif tags
* which can have format {@link PelFormat::SLONG}.
*
* @author Martin Geisler <mgeisler@users.sourceforge.net>
* @package PEL
*/
class PelEntrySLong extends PelEntryNumber {
/**
* Make a new entry that can hold a signed long.
*
* The method accept its arguments in two forms: several integer
* arguments or a single array argument. The {@link getValue}
* method will always return an array except for when a single
* integer argument is given here, or when an array with just a
* single integer is given.
*
* @param PelTag the tag which this entry represents. This
* should be one of the constants defined in {@link PelTag}
* which have format {@link PelFormat::SLONG}.
*
* @param int $value... the long(s) that this entry will represent
* or an array of longs. The argument passed must obey the same
* rules as the argument to {@link setValue}, namely that it should
* be within range of a signed long (32 bit), that is between
* -2147483648 and 2147483647 (inclusive). If not, then a {@link
* PelOverflowException} will be thrown.
*/
function __construct($tag /* $value... */) {
$this->tag = $tag;
$this->min = -2147483648;
$this->max = 2147483647;
$this->format = PelFormat::SLONG;
$value = func_get_args();
array_shift($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, $order) {
return PelConvert::sLongToBytes($number, $order);
}
}
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