<?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 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>
* @license http://www.gnu.org/licenses/gpl.html GNU General Public
* License (GPL)
* @package PEL
*/
/**
* 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 int $tag
* 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 $value...
* the byte(s) that this entry will represent.
* The argument passed must obey the same rules as the argument to
* {@link setValue}, namely that it should be within range of an
* unsigned byte, that is between 0 and 255 (inclusive). If not,
* then a {@link PelOverflowException} will be thrown.
*/
public function __construct($tag, $value = null)
{
$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 $number
* the number that should be converted.
*
* @param PelByteOrder $order
* one of {@link PelConvert::LITTLE_ENDIAN} and
* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
*
* @return string bytes representing the number given.
*/
public function numberToBytes($number, $order)
{
return chr($number);
}
}
|