182 lines
5.9 KiB
PHP
182 lines
5.9 KiB
PHP
<?php
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/* PEL: PHP Exif Library. A library with support for reading and
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* writing all Exif headers in JPEG and TIFF images using PHP.
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*
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* Copyright (C) 2004, 2005, 2006 Martin Geisler.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in the file COPYING; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/* $Id: PelEntryLong.php 419 2006-02-20 16:22:36Z mgeisler $ */
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/**
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* Classes used to hold longs, both signed and unsigned.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @version $Revision: 419 $
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* @date $Date: 2006-02-20 17:22:36 +0100 (Mon, 20 Feb 2006) $
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* @license http://www.gnu.org/licenses/gpl.html GNU General Public
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* License (GPL)
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* @package PEL
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*/
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/**#@+ Required class definitions. */
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require_once('PelEntryNumber.php');
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/**#@-*/
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/**
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* Class for holding unsigned longs.
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*
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* This class can hold longs, either just a single long or an array of
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* longs. The class will be used to manipulate any of the Exif tags
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* which can have format {@link PelFormat::LONG} like in this
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* example:
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* <code>
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* $w = $ifd->getEntry(PelTag::EXIF_IMAGE_WIDTH);
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* $w->setValue($w->getValue() / 2);
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* $h = $ifd->getEntry(PelTag::EXIF_IMAGE_HEIGHT);
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* $h->setValue($h->getValue() / 2);
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* </code>
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* Here the width and height is updated to 50% of their original
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* values.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @package PEL
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*/
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class PelEntryLong extends PelEntryNumber {
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/**
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* Make a new entry that can hold an unsigned long.
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*
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* The method accept its arguments in two forms: several integer
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* arguments or a single array argument. The {@link getValue}
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* method will always return an array except for when a single
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* integer argument is given here, or when an array with just a
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* single integer is given.
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*
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* This means that one can conveniently use objects like this:
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* <code>
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* $a = new PelEntryLong(PelTag::EXIF_IMAGE_WIDTH, 123456);
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* $b = $a->getValue() - 654321;
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* </code>
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* where the call to {@link getValue} will return an integer instead
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* of an array with one integer element, which would then have to be
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* extracted.
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*
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* @param PelTag the tag which this entry represents. This
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* should be one of the constants defined in {@link PelTag},
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* e.g., {@link PelTag::IMAGE_WIDTH}, or any other tag which can
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* have format {@link PelFormat::LONG}.
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*
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* @param int $value... the long(s) that this entry will
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* represent or an array of longs. The argument passed must obey
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* the same rules as the argument to {@link setValue}, namely that
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* it should be within range of an unsigned long (32 bit), that is
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* between 0 and 4294967295 (inclusive). If not, then a {@link
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* PelExifOverflowException} will be thrown.
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*/
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function __construct($tag /* $value... */) {
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$this->tag = $tag;
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$this->min = 0;
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$this->max = 4294967295;
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$this->format = PelFormat::LONG;
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$value = func_get_args();
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array_shift($value);
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$this->setValueArray($value);
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}
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/**
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* Convert a number into bytes.
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*
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* @param int the number that should be converted.
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*
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* @param PelByteOrder one of {@link PelConvert::LITTLE_ENDIAN} and
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* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
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*
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* @return string bytes representing the number given.
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*/
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function numberToBytes($number, $order) {
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return PelConvert::longToBytes($number, $order);
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}
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}
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/**
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* Class for holding signed longs.
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*
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* This class can hold longs, either just a single long or an array of
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* longs. The class will be used to manipulate any of the Exif tags
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* which can have format {@link PelFormat::SLONG}.
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*
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* @author Martin Geisler <mgeisler@users.sourceforge.net>
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* @package PEL
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*/
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class PelEntrySLong extends PelEntryNumber {
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/**
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* Make a new entry that can hold a signed long.
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*
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* The method accept its arguments in two forms: several integer
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* arguments or a single array argument. The {@link getValue}
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* method will always return an array except for when a single
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* integer argument is given here, or when an array with just a
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* single integer is given.
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*
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* @param PelTag the tag which this entry represents. This
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* should be one of the constants defined in {@link PelTag}
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* which have format {@link PelFormat::SLONG}.
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*
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* @param int $value... the long(s) that this entry will represent
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* or an array of longs. The argument passed must obey the same
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* rules as the argument to {@link setValue}, namely that it should
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* be within range of a signed long (32 bit), that is between
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* -2147483648 and 2147483647 (inclusive). If not, then a {@link
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* PelOverflowException} will be thrown.
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*/
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function __construct($tag /* $value... */) {
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$this->tag = $tag;
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$this->min = -2147483648;
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$this->max = 2147483647;
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$this->format = PelFormat::SLONG;
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$value = func_get_args();
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array_shift($value);
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$this->setValueArray($value);
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}
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/**
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* Convert a number into bytes.
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*
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* @param int the number that should be converted.
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*
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* @param PelByteOrder one of {@link PelConvert::LITTLE_ENDIAN} and
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* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
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*
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* @return string bytes representing the number given.
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*/
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function numberToBytes($number, $order) {
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return PelConvert::sLongToBytes($number, $order);
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}
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}
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?>
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