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<?php
/**
* Simple class to support some very basic operations on 64 bit intergers
* on 32 bit machines.
*
* 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 3 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. If not, see <http://www.gnu.org/licenses/>.
*
* @author Nicolai Ehemann <en@enlightened.de>
* @copyright Copyright (C) 2013-2014 Nicolai Ehemann and contributors
* @license GNU GPL
*/
namespace ZipStreamer\Lib;
class Count64_32 extends Count64Base {
private $loBytes;
private $hiBytes;
public function getHiBytes() {
return $this->hiBytes;
}
public function getLoBytes() {
return $this->loBytes;
}
public function _getValue() {
return array($this->hiBytes, $this->loBytes);
}
public function set($value) {
if (is_int($value)) {
$this->loBytes = $value;
$this->hiBytes = 0;
} else if (is_array($value) && 2 == count($value)) {
$this->loBytes = $value[0];
if ($this->limit32Bit && 0 !== $value[1]) {
throw new \OverflowException(self::EXCEPTION_32BIT_OVERFLOW);
}
$this->hiBytes = $value[1];
} else if (is_object($value) && __CLASS__ == get_class($value)) {
$value = $value->_getValue();
if ($this->limit32Bit && 0 !== $value[0]) {
throw new \OverflowException(self::EXCEPTION_32BIT_OVERFLOW);
}
$this->hiBytes = $value[0];
$this->loBytes = $value[1];
} else {
throw new \InvalidArgumentException(self::EXCEPTION_SET_INVALID_ARGUMENT);
}
return $this;
}
public function add($value) {
if (is_int($value)) {
$sum = (int) ($this->loBytes + $value);
// overflow!
if (($this->loBytes > -1 && $sum < $this->loBytes && $sum > -1)
|| ($this->loBytes < 0 && ($sum < $this->loBytes || $sum > -1))) {
if ($this->limit32Bit) {
throw new \OverflowException(self::EXCEPTION_32BIT_OVERFLOW);
}
$this->hiBytes = (int) ($this->hiBytes + 1);
}
$this->loBytes = $sum;
} else if (is_object($value) && __CLASS__ == get_class($value)) {
$value = $value->_getValue();
$sum = (int) ($this->loBytes + $value[1]);
if (($this->loBytes > -1 && $sum < $this->loBytes && $sum > -1)
|| ($this->loBytes < 0 && ($sum < $this->loBytes || $sum > -1))) {
if ($this->limit32Bit) {
throw new \OverflowException(self::EXCEPTION_32BIT_OVERFLOW);
}
$this->hiBytes = (int) ($this->hiBytes + 1);
}
$this->loBytes = $sum;
if ($this->limit32Bit && 0 !== $value[0]) {
throw new \OverflowException(self::EXCEPTION_32BIT_OVERFLOW);
}
$this->hiBytes = (int) ($this->hiBytes + $value[0]);
} else {
throw new \InvalidArgumentException(self::EXCEPTION_ADD_INVALID_ARGUMENT);
}
return $this;
}
}
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