SIP2 Protocol layer

gistfile1.txt

<?php
//2012, reindex.dk. Released under the MIT license.
class RxSIP {
  public static function dispatch ($commandString) {
    global $PORT;
    $response = "";
    $cmd = substr($commandString, 0, 2);
    $par = substr($commandString, 2, strlen($commandString));

    switch ($cmd) {
      case "23": //PatronStatusRequest
        $language            = substr($par, 0, 3) ; //3-char
        $transactionDate     = substr($par, 3, 18) ; //18-char   YYYYMMDDZZZZHHMMSS
        $params = array();
        $params[0] = $language;
        $params[1] = $transactionDate;

        RxSIP::wrap($par, $params,  21);
        break;
      case "11": //Checkout
        $SCRenewalPolicy     = substr($par, 0, 1);    // 1-char  - Y or N
        $noBlock             = substr($par, 1, 1);    // 1-char  - Y or N
        $transactionDate     = substr($par, 2, 18);   // 18-char   YYYYMMDDZZZZHHMMSS
        $nbDueDate           = substr($par, 20, 18);  // 18-char   YYYYMMDDZZZZHHMMSS

        $params = array();
        $params[0] = $SCRenewalPolicy;
        $params[1] = $noBlock;
        $params[2] = $transactionDate ;
        $params[3] = $nbDueDate;
        RxSIP::wrap($par, $params, 38);
        break;
      case "09": //CheckIn
        $noBlock             = substr($par, 0, 1) ; // 1-char  - Y or N
        $transactionDate     = substr($par, 1, 18) ; //18-char   YYYYMMDDZZZZHHMMSS
        $returnDate          = substr($par, 19, 18) ; //18-char   YYYYMMDDZZZZHHMMSS
 
        $params = array();
        $params[0] = $noBlock;
        $params[1] = $transactionDate;
        $params[2] = $returnDate;

        RxSIP::wrap($par, $params , 37);
        break;
      case "99": //SCStatus
        $statusCode          =  substr($par, 0, 1);  // 1-char : 0, 1 or 2
        $maxPrintWidth       =  substr($par, 1, 3);  // 3-char
        $protocolVersion     =  substr($par, 4, 4);  // 4-char : x.xx
        $params = array();
        $params[0] = $statusCode ;
        $params[1] = $maxPrintWidth;
        $params[2] = $protocolVersion;
       break;
      //case "97": //ACSResend
      //  break;
      case "93": //Login
        $UIDAlgorithm      =  substr($par, 0, 1);  //1-char (The algorithm to encrypt the user ID)
        $PWDAlgorithm      =  substr($par, 1, 1);  //1-char (The algorithm to encrypt the password)

        $params = array();
        $params[0] = $UIDAlgorithm;
        $params[1] = $PWDAlgorithm;
        break;
      case "63": //PatronInformation
        $language            = substr($par, 0, 3); //3-char
        $transactionDate     = substr($par, 3, 18); //18-char   YYYYMMDDZZZZHHMMSS
        $summary             = substr($par, 18, 10); //10-char
        $params = array();
        $params[0] = $language;
        $params[1] = $transactionDate;
        RXSIP::wrap($par, $params, 28);
        break;
      case "35": //EndPatronSession
        $transactionDate     = substr($par, 0, 18) ; //18-char   YYYYMMDDZZZZHHMMSS
        $params = array();
        $params[0] = $transactionDate;
        RXSIP::wrap($par, $params, 18);
        break;
      case "65": //RenewAll
        $transactionDate     = substr($par, 0, 18) ; //18-char   YYYYMMDDZZZZHHMMSS
        $params = array();
        $params[0] = $transactionDate;
        RXSIP::wrap($par, $params, 18);
        break;
      default:
        break;
    }
    $p = ( array( $cmd => $params ) );
    return  $p ;
  }

  public static function wrap( $cmd, &$params,  $startPosition )  {
    $vars = explode("|", substr($cmd, $startPosition, strlen($cmd)-$startPosition));
    foreach($vars as $var) {
      $key = substr($var, 0, 2);
      $value = substr($var, 2, strlen($var));
      if (trim($key) <> "") {
        $params[$key] = $value;
      }
    }
    return $params;
  }

  public static function unwrap( $params ) {
    $response = key($params);
    foreach($params[key($params)] as $key => $value ) {
       if (is_numeric($key)) {
          $response.=$value;
       } else {
          $response.="|";
          $response.=$key.$value;
       }
    }
    $response.="|";
    return $response;
  }
}
?>