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   1  <?php
   2  /*
   3   * This file is part of the PHPASN1 library.
   4   *
   5   * Copyright © Friedrich Große <[email protected]>
   6   *
   7   * For the full copyright and license information, please view the LICENSE
   8   * file that was distributed with this source code.
   9   */
  10  
  11  namespace FG\ASN1\Universal;
  12  
  13  use FG\ASN1\AbstractTime;
  14  use FG\ASN1\Parsable;
  15  use FG\ASN1\Identifier;
  16  use FG\ASN1\Exception\ParserException;
  17  
  18  /**
  19   * This ASN.1 universal type contains the calendar date and time.
  20   *
  21   * The precision is one minute or one second and optionally a
  22   * local time differential from coordinated universal time.
  23   *
  24   * Decoding of this type will accept the Basic Encoding Rules (BER)
  25   * The encoding will comply with the Distinguished Encoding Rules (DER).
  26   */
  27  class UTCTime extends AbstractTime implements Parsable
  28  {
  29      public function getType()
  30      {
  31          return Identifier::UTC_TIME;
  32      }
  33  
  34      protected function calculateContentLength()
  35      {
  36          return 13; // Content is a string o the following format: YYMMDDhhmmssZ (13 octets)
  37      }
  38  
  39      protected function getEncodedValue()
  40      {
  41          return $this->value->format('ymdHis').'Z';
  42      }
  43  
  44      public static function fromBinary(&$binaryData, &$offsetIndex = 0)
  45      {
  46          self::parseIdentifier($binaryData[$offsetIndex], Identifier::UTC_TIME, $offsetIndex++);
  47          $contentLength = self::parseContentLength($binaryData, $offsetIndex, 11);
  48  
  49          $format = 'ymdGi';
  50          $dateTimeString = substr($binaryData, $offsetIndex, 10);
  51          $offsetIndex += 10;
  52  
  53          // extract optional seconds part
  54          if ($binaryData[$offsetIndex] != 'Z'
  55          && $binaryData[$offsetIndex] != '+'
  56          && $binaryData[$offsetIndex] != '-') {
  57              $dateTimeString .= substr($binaryData, $offsetIndex, 2);
  58              $offsetIndex += 2;
  59              $format .= 's';
  60          }
  61  
  62          $dateTime = \DateTime::createFromFormat($format, $dateTimeString, new \DateTimeZone('UTC'));
  63  
  64          // extract time zone settings
  65          if ($binaryData[$offsetIndex] == '+'
  66          || $binaryData[$offsetIndex] == '-') {
  67              $dateTime = static::extractTimeZoneData($binaryData, $offsetIndex, $dateTime);
  68          } elseif ($binaryData[$offsetIndex++] != 'Z') {
  69              throw new ParserException('Invalid UTC String', $offsetIndex);
  70          }
  71  
  72          $parsedObject = new self($dateTime);
  73          $parsedObject->setContentLength($contentLength);
  74  
  75          return $parsedObject;
  76      }
  77  }