--- /dev/null
+<?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
+ */
+namespace lsolesen\pel;
+
+/**
+ * Classes used to hold longs, both signed and unsigned.
+ *
+ * @author Martin Geisler <mgeisler@users.sourceforge.net>
+ * @license http://www.gnu.org/licenses/gpl.html GNU General Public
+ * License (GPL)
+ * @package PEL
+ */
+
+/**
+ * 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 $value...
+ * the long(s) that this entry will
+ * represent or an array of longs. The argument passed must obey
+ * the same rules as the argument to {@link setValue}, namely that
+ * it should be within range of an unsigned long (32 bit), that is
+ * between 0 and 4294967295 (inclusive). If not, then a {@link
+ * PelExifOverflowException} will be thrown.
+ */
+ public function __construct($tag, $value = null)
+ {
+ $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.
+ */
+ public function numberToBytes($number, $order)
+ {
+ return PelConvert::longToBytes($number, $order);
+ }
+}