PHP Reader::readInt8方法代码示例

 /**
  * Constructs the ID3v1 class with given file. The file is not mandatory
  * argument and may be omitted. A new tag can be written to a file also by
  * giving the filename to the {@link #write} method of this class.
  *
  * @param string $filename The path to the file.
  */
 public function __construct($filename = false)
 {
     if (($this->_filename = $filename) === false || file_exists($filename) === false) {
         return;
     }
     $this->_reader = new Reader($filename);
     if ($this->_reader->getSize() < 128) {
         return;
     }
     $this->_reader->setOffset(-128);
     if ($this->_reader->read(3) != "TAG") {
         $this->_reader = false;
         // reset reader, see write
         return;
     }
     $this->_title = rtrim($this->_reader->readString8(30), " ");
     $this->_artist = rtrim($this->_reader->readString8(30), " ");
     $this->_album = rtrim($this->_reader->readString8(30), " ");
     $this->_year = $this->_reader->readString8(4);
     $this->_comment = rtrim($this->_reader->readString8(28), " ");
     /* ID3v1.1 support for tracks */
     $v11_null = $this->_reader->read(1);
     $v11_track = $this->_reader->read(1);
     if (ord($v11_null) == 0 && ord($v11_track) != 0) {
         $this->_track = ord($v11_track);
     } else {
         $this->_comment = rtrim($this->_comment . $v11_null . $v11_track, " ");
     }
     $this->_genre = $this->_reader->readInt8();
 }

  /**
   * Returns the recognized MIME type/description of the given file. The type
   * is determined by the content using magic bytes characteristic for the
   * particular file type.
   *
   * If the type could not be found, the function returns the default value, or
   * <var>false</var>.
   *
   * @param string $filename The file path whose type to determine.
   * @param string $default  The default value.
   * @return string|false
   */
  public function getType($filename, $default = false)
  {
    $reader = new Reader($filename);

    $parentOffset = 0;
    foreach (preg_split("/^/m", $this->_magic) as $line) {
      $chunks = array();
      if (!preg_match("/^(?P<Dependant>>?)(?P<Byte>\d+)\s+(?P<MatchType>\S+)" .
                      "\s+(?P<MatchData>\S+)(?:\s+(?P<MIMEType>[a-z]+\/[a-z-" .
                      "0-9]+)?(?:\s+(?P<Description>.+))?)?$/", $line, $chunks))
        continue;
      
      if ($chunks["Dependant"]) {
        $reader->setOffset($parentOffset);
        $reader->skip($chunks["Byte"]);
      } else
        $reader->setOffset($parentOffset = $chunks["Byte"]);

      $matchType = strtolower($chunks["MatchType"]);
      $matchData = preg_replace
        (array("/\\\\ /", "/\\\\\\\\/", "/\\\\([0-7]{1,3})/e",
               "/\\\\x([0-9A-Fa-f]{1,2})/e", "/0x([0-9A-Fa-f]+)/e"),
         array(" ", "\\\\", "pack(\"H*\", base_convert(\"$1\", 8, 16));",
               "pack(\"H*\", \"$1\");", "hexdec(\"$1\");"),
         $chunks["MatchData"]);

      switch ($matchType) {
      case "byte":    // single character
        $data = $reader->readInt8();
        break;
      case "short":   // machine-order 16-bit integer
        $data = $reader->readInt16();
        break;
      case "long":    // machine-order 32-bit integer
        $data = $reader->readInt32();
        break;
      case "string":  // arbitrary-length string
        $data = $reader->readString8(strlen($matchData));
        break;
      case "date":    // long integer date (seconds since Unix epoch/1970)
        $data = $reader->readInt64BE();
        break;
      case "beshort": // big-endian 16-bit integer
        $data = $reader->readUInt16BE();
        break;
      case "belong":  // big-endian 32-bit integer
      case "bedate":  // big-endian 32-bit integer date
        $data = $reader->readUInt32BE();
        break;
      case "leshort": // little-endian 16-bit integer
        $data = $reader->readUInt16LE();
        break;
      case "lelong":  // little-endian 32-bit integer
      case "ledate":  // little-endian 32-bit integer date
        $data = $reader->readUInt32LE();
        break;
      default:
        $data = null;
        break;
      }

      if (strcmp($data, $matchData) == 0) {
        if (!empty($chunks["MIMEType"]))
          return $chunks["MIMEType"];
        if (!empty($chunks["Description"]))
          return $chunks["Description"];
      }
    }
    return $default;
  }

  /**
   * Constructs the ID3v1 class with given file. The file is not mandatory
   * argument and may be omitted. A new tag can be written to a file also by
   * giving the filename to the {@link #write} method of this class.
   *
   * @param string|Reader $filename The path to the file, file descriptor of an
   *                                opened file, or {@link Reader} instance.
   */
  public function __construct($filename = false)
  {
    if ($filename instanceof Reader)
      $this->_reader = &$filename;
    else if ((is_string($filename) && ($this->_filename = $filename) !== false &&
              file_exists($filename) !== false) ||
             (is_resource($filename) &&
              in_array(get_resource_type($filename), array("file", "stream"))))
      $this->_reader = new Reader($filename);
    else
      return;

    if ($this->_reader->getSize() < 128)
      throw new ID3_Exception("File does not contain ID3v1 tag");
    $this->_reader->setOffset(-128);
    if ($this->_reader->read(3) != "TAG") {
      $this->_reader = false; // reset reader, see write
      throw new ID3_Exception("File does not contain ID3v1 tag");
    }

    $this->_title = rtrim($this->_reader->readString8(30), " \0");
    $this->_artist = rtrim($this->_reader->readString8(30), " \0");
    $this->_album = rtrim($this->_reader->readString8(30), " \0");
    $this->_year = $this->_reader->readString8(4);
    $this->_comment = rtrim($this->_reader->readString8(28), " \0");

    /* ID3v1.1 support for tracks */
    $v11_null = $this->_reader->read(1);
    $v11_track = $this->_reader->read(1);
    if (ord($v11_null) == 0 && ord($v11_track) != 0)
      $this->_track = ord($v11_track);
    else
      $this->_comment = rtrim($this->_comment . $v11_null . $v11_track, " \0");

    $this->_genre = $this->_reader->readInt8();
  }