309 lines
8.3 KiB
PHP
309 lines
8.3 KiB
PHP
|
<?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: PelEntryNumber.php 419 2006-02-20 16:22:36Z mgeisler $ */
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Abstract class for numbers.
|
||
|
*
|
||
|
* @author Martin Geisler <mgeisler@users.sourceforge.net>
|
||
|
* @version $Revision: 419 $
|
||
|
* @date $Date: 2006-02-20 17:22:36 +0100 (Mon, 20 Feb 2006) $
|
||
|
* @license http://www.gnu.org/licenses/gpl.html GNU General Public
|
||
|
* License (GPL)
|
||
|
* @package PEL
|
||
|
*/
|
||
|
|
||
|
/**#@+ Required class definitions. */
|
||
|
require_once('PelException.php');
|
||
|
require_once('PelEntry.php');
|
||
|
/**#@-*/
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Exception cast when numbers overflow.
|
||
|
*
|
||
|
* @author Martin Geisler <mgeisler@users.sourceforge.net>
|
||
|
* @package PEL
|
||
|
* @subpackage Exception
|
||
|
*/
|
||
|
class PelOverflowException extends PelException {
|
||
|
|
||
|
/**
|
||
|
* Construct a new overflow exception.
|
||
|
*
|
||
|
* @param int the value that is out of range.
|
||
|
*
|
||
|
* @param int the minimum allowed value.
|
||
|
*
|
||
|
* @param int the maximum allowed value.
|
||
|
*/
|
||
|
function __construct($v, $min, $max) {
|
||
|
parent::__construct('Value %.0f out of range [%.0f, %.0f]',
|
||
|
$v, $min, $max);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Class for holding numbers.
|
||
|
*
|
||
|
* This class can hold numbers, with range checks.
|
||
|
*
|
||
|
* @author Martin Geisler <mgeisler@users.sourceforge.net>
|
||
|
* @package PEL
|
||
|
*/
|
||
|
abstract class PelEntryNumber extends PelEntry {
|
||
|
|
||
|
/**
|
||
|
* The value held by this entry.
|
||
|
*
|
||
|
* @var array
|
||
|
*/
|
||
|
protected $value = array();
|
||
|
|
||
|
/**
|
||
|
* The minimum allowed value.
|
||
|
*
|
||
|
* Any attempt to change the value below this variable will result
|
||
|
* in a {@link PelOverflowException} being thrown.
|
||
|
*
|
||
|
* @var int
|
||
|
*/
|
||
|
protected $min;
|
||
|
|
||
|
/**
|
||
|
* The maximum allowed value.
|
||
|
*
|
||
|
* Any attempt to change the value over this variable will result in
|
||
|
* a {@link PelOverflowException} being thrown.
|
||
|
*
|
||
|
* @var int
|
||
|
*/
|
||
|
protected $max;
|
||
|
|
||
|
/**
|
||
|
* The dimension of the number held.
|
||
|
*
|
||
|
* Normal numbers have a dimension of one, pairs have a dimension of
|
||
|
* two, etc.
|
||
|
*
|
||
|
* @var int
|
||
|
*/
|
||
|
protected $dimension = 1;
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Change the value.
|
||
|
*
|
||
|
* This method can change both the number of components and the
|
||
|
* value of the components. Range checks will be made on the new
|
||
|
* value, and a {@link PelOverflowException} will be thrown if the
|
||
|
* value is found to be outside the legal range.
|
||
|
*
|
||
|
* The method accept several number arguments. The {@link getValue}
|
||
|
* method will always return an array except for when a single
|
||
|
* number is given here.
|
||
|
*
|
||
|
* @param int|array $value... the new value(s). This can be zero or
|
||
|
* more numbers, that is, either integers or arrays. The input will
|
||
|
* be checked to ensure that the numbers are within the valid range.
|
||
|
* If not, then a {@link PelOverflowException} will be thrown.
|
||
|
*
|
||
|
* @see getValue
|
||
|
*/
|
||
|
function setValue(/* $value... */) {
|
||
|
$value = func_get_args();
|
||
|
$this->setValueArray($value);
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Change the value.
|
||
|
*
|
||
|
* This method can change both the number of components and the
|
||
|
* value of the components. Range checks will be made on the new
|
||
|
* value, and a {@link PelOverflowException} will be thrown if the
|
||
|
* value is found to be outside the legal range.
|
||
|
*
|
||
|
* @param array the new values. The array must contain the new
|
||
|
* numbers.
|
||
|
*
|
||
|
* @see getValue
|
||
|
*/
|
||
|
function setValueArray($value) {
|
||
|
foreach ($value as $v)
|
||
|
$this->validateNumber($v);
|
||
|
|
||
|
$this->components = count($value);
|
||
|
$this->value = $value;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Return the numeric value held.
|
||
|
*
|
||
|
* @return int|array this will either be a single number if there is
|
||
|
* only one component, or an array of numbers otherwise.
|
||
|
*/
|
||
|
function getValue() {
|
||
|
if ($this->components == 1)
|
||
|
return $this->value[0];
|
||
|
else
|
||
|
return $this->value;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Validate a number.
|
||
|
*
|
||
|
* This method will check that the number given is within the range
|
||
|
* given my {@link getMin()} and {@link getMax()}, inclusive. If
|
||
|
* not, then a {@link PelOverflowException} is thrown.
|
||
|
*
|
||
|
* @param int|array the number in question.
|
||
|
*
|
||
|
* @return void nothing, but will throw a {@link
|
||
|
* PelOverflowException} if the number is found to be outside the
|
||
|
* legal range and {@link Pel::$strict} is true.
|
||
|
*/
|
||
|
function validateNumber($n) {
|
||
|
if ($this->dimension == 1) {
|
||
|
if ($n < $this->min || $n > $this->max)
|
||
|
Pel::maybeThrow(new PelOverflowException($n,
|
||
|
$this->min,
|
||
|
$this->max));
|
||
|
} else {
|
||
|
for ($i = 0; $i < $this->dimension; $i++)
|
||
|
if ($n[$i] < $this->min || $n[$i] > $this->max)
|
||
|
Pel::maybeThrow(new PelOverflowException($n[$i],
|
||
|
$this->min,
|
||
|
$this->max));
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Add a number.
|
||
|
*
|
||
|
* This appends a number to the numbers already held by this entry,
|
||
|
* thereby increasing the number of components by one.
|
||
|
*
|
||
|
* @param int|array the number to be added.
|
||
|
*/
|
||
|
function addNumber($n) {
|
||
|
$this->validateNumber($n);
|
||
|
$this->value[] = $n;
|
||
|
$this->components++;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Convert a number into bytes.
|
||
|
*
|
||
|
* The concrete subclasses will have to implement this method so
|
||
|
* that the numbers represented can be turned into bytes.
|
||
|
*
|
||
|
* The method will be called once for each number held by the entry.
|
||
|
*
|
||
|
* @param int the number that should be converted.
|
||
|
*
|
||
|
* @param PelByteOrder one of {@link PelConvert::LITTLE_ENDIAN} and
|
||
|
* {@link PelConvert::BIG_ENDIAN}, specifying the target byte order.
|
||
|
*
|
||
|
* @return string bytes representing the number given.
|
||
|
*/
|
||
|
abstract function numberToBytes($number, $order);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Turn this entry into bytes.
|
||
|
*
|
||
|
* @param PelByteOrder the desired byte order, which must be either
|
||
|
* {@link PelConvert::LITTLE_ENDIAN} or {@link
|
||
|
* PelConvert::BIG_ENDIAN}.
|
||
|
*
|
||
|
* @return string bytes representing this entry.
|
||
|
*/
|
||
|
function getBytes($o) {
|
||
|
$bytes = '';
|
||
|
for ($i = 0; $i < $this->components; $i++) {
|
||
|
if ($this->dimension == 1) {
|
||
|
$bytes .= $this->numberToBytes($this->value[$i], $o);
|
||
|
} else {
|
||
|
for ($j = 0; $j < $this->dimension; $j++) {
|
||
|
$bytes .= $this->numberToBytes($this->value[$i][$j], $o);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return $bytes;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Format a number.
|
||
|
*
|
||
|
* This method is called by {@link getText} to format numbers.
|
||
|
* Subclasses should override this method if they need more
|
||
|
* sophisticated behavior than the default, which is to just return
|
||
|
* the number as is.
|
||
|
*
|
||
|
* @param int the number which will be formatted.
|
||
|
*
|
||
|
* @param boolean it could be that there is both a verbose and a
|
||
|
* brief formatting available, and this argument controls that.
|
||
|
*
|
||
|
* @return string the number formatted as a string suitable for
|
||
|
* display.
|
||
|
*/
|
||
|
function formatNumber($number, $brief = false) {
|
||
|
return $number;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Get the numeric value of this entry as text.
|
||
|
*
|
||
|
* @param boolean use brief output? The numbers will be separated
|
||
|
* by a single space if brief output is requested, otherwise a space
|
||
|
* and a comma will be used.
|
||
|
*
|
||
|
* @return string the numbers(s) held by this entry.
|
||
|
*/
|
||
|
function getText($brief = false) {
|
||
|
if ($this->components == 0)
|
||
|
return '';
|
||
|
|
||
|
$str = $this->formatNumber($this->value[0]);
|
||
|
for ($i = 1; $i < $this->components; $i++) {
|
||
|
$str .= ($brief ? ' ' : ', ');
|
||
|
$str .= $this->formatNumber($this->value[$i]);
|
||
|
}
|
||
|
|
||
|
return $str;
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
?>
|