/**
* Decode a message, and return the corresponding object
*
* @param CDicomStreamReader $stream_reader The stream reader
*
* @param integer $control_header The control header
*
* @param string $transfer_syntax The transfer syntax
*
* @return object
*/
static function decodeMessage(CDicomStreamReader $stream_reader, $control_header, $transfer_syntax)
{
if ($control_header == 0 || $control_header == 2) {
$message_class = self::getMessageClass("data");
} else {
$datasets = array();
$dataset = new CDicomDataSet();
$dataset->decode($stream_reader, $transfer_syntax);
$datasets[$dataset->getElementNumber()] = $dataset;
$dataset = new CDicomDataSet();
$dataset->decode($stream_reader, $transfer_syntax);
$datasets[$dataset->getElementNumber()] = $dataset;
$dataset = new CDicomDataSet();
$dataset->decode($stream_reader, $transfer_syntax);
$datasets[$dataset->getElementNumber()] = $dataset;
$stream_reader->rewind();
if (!array_key_exists(0x100, $datasets)) {
return null;
}
$message_class = self::getMessageClass($datasets[0x100]->getValue());
}
$message = new $message_class();
$message->decode($stream_reader, $transfer_syntax);
return $message;
}
/**
* Return a string representation of the class
*
* @return string
*/
function __toString()
{
return "<table>\n <tr>\n <th>Tag</th><th>Name</th><th>VR</th><th>Length</th><th>Value</th>\n </tr>\n <tr>" . $this->command_group_length->__toString() . "</tr>\n <tr>" . $this->affected_sop_class->__toString() . "</tr>\n <tr>" . $this->command_field->__toString() . "</tr>\n <tr>" . $this->message_id->__toString() . "</tr>\n <tr>" . $this->command_data_set->__toString() . "</tr>\n </table>";
}
/**
* Decode the datas, depending on the transfer syntax
*
* @param CDicomStreamReader $stream_reader The stream writer
*
* @param string $transfer_syntax The UID of the transfer syntax
*
* @return void
*/
function decode(CDicomStreamReader $stream_reader, $transfer_syntax)
{
if (!$transfer_syntax) {
return;
}
$this->attributes = array();
$this->datasets = array();
$stream_length = $stream_reader->getStreamLength();
while ($stream_reader->getPos() < $stream_length) {
$dataset = new CDicomDataSet();
$dataset->decode($stream_reader, $transfer_syntax);
$group = $dataset->getGroupNumber();
$element = $dataset->getElementNumber();
if (!array_key_exists($group, $this->datasets)) {
$this->datasets[$group] = array();
}
if (!array_key_exists($group, $this->attributes)) {
$this->attributes[$group] = array();
}
$this->datasets[$group][$element] = $dataset;
$this->attributes[$group][$element] = $dataset->getValue();
}
}
/**
* Decode the value
*
* @param CDicomStreamReader $stream_reader The stream reader
* @param string $endianness The endianness, must be equal to "BE" (Big Endian) or "LE" (Little Endian)
*
* @return null
*
* @todo traiter les cas FL, FD, OB, OW, OF, SQ
*/
protected function decodeValue(CDicomStreamReader $stream_reader, $endianness)
{
switch ($this->vr) {
case 'AE':
case 'AS':
case 'CS':
case 'DA':
case 'DS':
case 'DT':
case 'FL':
case 'FD':
case 'IS':
case 'LO':
case 'LT':
case 'OB':
case 'OF':
case 'OX':
case 'OW':
case 'PN':
case 'SH':
case 'ST':
case 'TM':
case 'UN':
case 'UT':
$this->value = $stream_reader->readString($this->length);
break;
case 'AT':
$this->value = array();
$this->value[] = $stream_reader->readUInt16($endianness);
$this->value[] = $stream_reader->readUInt16($endianness);
break;
case 'SL':
$this->value = $stream_reader->readInt32($endianness);
break;
case 'SS':
$this->value = $stream_reader->readInt16($endianness);
break;
case 'UI':
$this->value = $stream_reader->readUID($this->length);
break;
case 'UL':
$this->value = $stream_reader->readUInt32($endianness);
break;
case 'US':
$this->value = $stream_reader->readUInt16($endianness);
break;
case 'SQ':
$tmp_value = array();
$value_stream = new CDicomStreamReader();
/** Sequence of items with undefined length **/
if ($this->length == 0xffffffff) {
$delimiter = new CDicomDataSet();
$delimiter->decode($stream_reader, $this->transfer_syntax);
while ($delimiter->group_number == 0xfffe && $delimiter->element_number != 0xe0dd) {
$sequence = array($delimiter);
if ($delimiter->length == 0xffffffff) {
$item_delimiter = new CDicomDataSet();
$item_delimiter->decode($stream_reader, $this->transfer_syntax);
$sequence[] = $item_delimiter;
while ($item_delimiter->group_number == 0xfffe && $item_delimiter->element_number != 0xe00d) {
$dataset = new CDicomDataSet();
$dataset->decode($value_stream, $this->transfer_syntax);
$sequence[] = $dataset;
$item_delimiter = new CDicomDataSet();
$item_delimiter->decode($stream_reader, $this->transfer_syntax);
$sequence[] = $item_delimiter;
}
} else {
$sequence_end = $value_stream->getPos();
// + $sequence_length;
while ($value_stream->getPos() < $sequence_end) {
$dataset = new CDicomDataSet();
$dataset->decode($value_stream, $this->transfer_syntax);
$sequence[] = $dataset;
}
}
$delimiter = new CDicomDataSet();
$delimiter->decode($stream_reader, $this->transfer_syntax);
$sequence[] = $delimiter;
$tmp_value[] = $sequence;
}
} else {
$content = $stream_reader->read($this->length);
fwrite($value_stream->stream, $content, $this->length);
$value_stream->rewind();
while ($value_stream->getPos() < $this->length) {
$value_stream->skip(4);
$sequence_length = $value_stream->readUInt32($endianness);
$sequence = array();
$sequence_end = $value_stream->getPos() + $sequence_length;
while ($value_stream->getPos() < $sequence_end) {
$dataset = new CDicomDataSet();
$dataset->decode($value_stream, $this->transfer_syntax);
$sequence[] = $dataset;
}
$tmp_value[] = $sequence;
}
}
$this->value = $tmp_value;
break;
default:
break;
}
}
/**
* Return a string representation of the class
*
* @return string
*/
function __toString()
{
return "C-Cancel-Find-RQ :\n <table>\n <tr>\n <th>Tag</th><th>Name</th><th>VR</th><th>Length</th><th>Value</th>\n </tr>\n <tr>" . $this->command_group_length->__toString() . "</c>\n <tr>" . $this->command_field->__toString() . "</tr>\n <tr>" . $this->message_id_request->__toString() . "</tr>\n <tr>" . $this->command_data_set->__toString() . "</tr>\n </table>";
}
