--- /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, 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
+ */
+namespace lsolesen\pel;
+
+/**
+ * Classes used to hold ASCII strings.
+ *
+ * The classes defined here are to be used for Exif entries holding
+ * ASCII strings, such as {@link PelTag::MAKE}, {@link
+ * PelTag::SOFTWARE}, and {@link PelTag::DATE_TIME}. For
+ * entries holding normal textual ASCII strings the class {@link
+ * PelEntryAscii} should be used, but for entries holding
+ * timestamps the class {@link PelEntryTime} would be more
+ * convenient instead. Copyright information is handled by the {@link
+ * PelEntryCopyright} class.
+ *
+ * @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 a plain ASCII string.
+ *
+ * This class can hold a single ASCII string, and it will be used as in
+ * <code>
+ * $entry = $ifd->getEntry(PelTag::IMAGE_DESCRIPTION);
+ * print($entry->getValue());
+ * $entry->setValue('This is my image. I like it.');
+ * </code>
+ *
+ * @author Martin Geisler <mgeisler@users.sourceforge.net>
+ * @package PEL
+ */
+class PelEntryAscii 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 final NULL
+ * character.
+ *
+ * @var string
+ */
+ private $str;
+
+ /**
+ * Make a new PelEntry that can hold an ASCII string.
+ *
+ * @param int $tag
+ * the tag which this entry represents. This should be
+ * one of the constants defined in {@link PelTag}, e.g., {@link
+ * PelTag::IMAGE_DESCRIPTION}, {@link PelTag::MODEL}, or any other
+ * tag with format {@link PelFormat::ASCII}.
+ *
+ * @param string $str
+ * the string that this entry will represent. The
+ * string must obey the same rules as the string argument to {@link
+ * setValue}, namely that it should be given without any trailing
+ * NULL character and that it must be plain 7-bit ASCII.
+ */
+ public function __construct($tag, $str = '')
+ {
+ $this->tag = $tag;
+ $this->format = PelFormat::ASCII;
+ self::setValue($str);
+ }
+
+ /**
+ * Give the entry a new ASCII 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 given
+ * without any trailing NULL character. The string must be plain
+ * 7-bit ASCII, the string should contain no high bytes.
+ *
+ * @todo Implement check for high bytes?
+ */
+ public function setValue($str)
+ {
+ $this->components = strlen($str) + 1;
+ $this->str = $str;
+ $this->bytes = $str . chr(0x00);
+ }
+
+ /**
+ * Return the ASCII string of the entry.
+ *
+ * @return string the string held, without any final NULL character.
+ * The string will be the same as the one given to {@link setValue}
+ * or to the {@link __construct constructor}.
+ */
+ public function getValue()
+ {
+ return $this->str;
+ }
+
+ /**
+ * Return the ASCII string of the entry.
+ *
+ * This methods returns the same as {@link getValue}.
+ *
+ * @param
+ * boolean not used with ASCII entries.
+ *
+ * @return string the string held, without any final NULL character.
+ * The string will be the same as the one given to {@link setValue}
+ * or to the {@link __construct constructor}.
+ */
+ public function getText($brief = false)
+ {
+ return $this->str;
+ }
+}