137 lines
3.3 KiB
PHP
137 lines
3.3 KiB
PHP
<?php
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/*
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* This file is part of the PHPASN1 library.
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*
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* Copyright © Friedrich Große <friedrich.grosse@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace FG\ASN1;
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use Exception;
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abstract class AbstractString extends ASNObject implements Parsable
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{
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/** @var string */
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protected $value;
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private $checkStringForIllegalChars = true;
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private $allowedCharacters = [];
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/**
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* The abstract base class for ASN.1 classes which represent some string of character.
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*
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* @param string $string
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*/
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public function __construct($string)
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{
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$this->value = $string;
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}
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public function getContent()
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{
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return $this->value;
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}
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protected function allowCharacter($character)
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{
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$this->allowedCharacters[] = $character;
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}
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protected function allowCharacters(...$characters)
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{
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foreach ($characters as $character) {
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$this->allowedCharacters[] = $character;
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}
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}
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protected function allowNumbers()
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{
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foreach (range('0', '9') as $char) {
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$this->allowedCharacters[] = (string) $char;
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}
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}
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protected function allowAllLetters()
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{
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$this->allowSmallLetters();
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$this->allowCapitalLetters();
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}
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protected function allowSmallLetters()
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{
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foreach (range('a', 'z') as $char) {
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$this->allowedCharacters[] = $char;
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}
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}
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protected function allowCapitalLetters()
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{
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foreach (range('A', 'Z') as $char) {
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$this->allowedCharacters[] = $char;
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}
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}
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protected function allowSpaces()
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{
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$this->allowedCharacters[] = ' ';
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}
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protected function allowAll()
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{
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$this->checkStringForIllegalChars = false;
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}
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protected function calculateContentLength()
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{
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return strlen($this->value);
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}
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protected function getEncodedValue()
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{
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if ($this->checkStringForIllegalChars) {
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$this->checkString();
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}
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return $this->value;
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}
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protected function checkString()
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{
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$stringLength = $this->getContentLength();
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for ($i = 0; $i < $stringLength; $i++) {
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if (in_array($this->value[$i], $this->allowedCharacters) == false) {
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$typeName = Identifier::getName($this->getType());
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throw new Exception("Could not create a {$typeName} from the character sequence '{$this->value}'.");
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}
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}
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}
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public static function fromBinary(&$binaryData, &$offsetIndex = 0)
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{
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$parsedObject = new static('');
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self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
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$contentLength = self::parseContentLength($binaryData, $offsetIndex);
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$string = substr($binaryData, $offsetIndex, $contentLength);
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$offsetIndex += $contentLength;
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$parsedObject->value = $string;
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$parsedObject->setContentLength($contentLength);
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return $parsedObject;
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}
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public static function isValid($string)
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{
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$testObject = new static($string);
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try {
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$testObject->checkString();
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return true;
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} catch (Exception $exception) {
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return false;
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}
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}
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}
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