/**
* Decode the Maximum Length
*
* @param CDicomStreamReader $stream_reader The stream reader
*
* @return null
*/
function decodeItem(CDicomStreamReader $stream_reader)
{
$this->maximum_length = $stream_reader->readUInt32();
}
/**
* 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;
}
}
/**
* Check if the message is well formed
*
* @param string $msg The message
*
* @param CInteropActor $actor The actor who sent the message
*
* @return boolean
*/
function isWellFormed($msg, CInteropActor $actor = null)
{
$stream = fopen("php://temp", 'w+');
fwrite($stream, $msg);
$stream_reader = new CDicomStreamReader($stream);
$stream_reader->rewind();
$type = $stream_reader->readHexByte();
if ($type != "04") {
$stream_reader->close();
return false;
}
$stream_reader->skip(1);
$length = $stream_reader->readUInt32();
$stream_reader->close();
if (strlen($msg) != $length + 6) {
return false;
}
return true;
}
/**
* Read the length of the PDU from the stream
*
* @param CDicomStreamReader $stream The stream reader
*
* @return integer
*/
static function readLength(CDicomStreamReader $stream)
{
return $stream->readUInt32();
}
/**
* Decode the PDU
*
* @param CDicomStreamReader $stream_reader The stream reader
*
* @return null
*/
function decodePDU(CDicomStreamReader $stream_reader)
{
$this->pdvs = array();
$stream_reader->setStreamLength($this->getTotalLength());
while ($stream_reader->getPos() < $stream_reader->getStreamLength()) {
$pdv_length = $stream_reader->readUInt32();
// + 4;
//$stream_reader->seek(-4);
$pdv_content = $stream_reader->read($pdv_length);
$pdv_handle = fopen('php://temp', 'w+');
fwrite($pdv_handle, $pdv_content, $pdv_length);
$pdv_stream = new CDicomStreamReader($pdv_handle);
$pdv_stream->rewind();
$pdv = new CDicomPDV(array("presentation_contexts" => $this->presentation_contexts, "length" => $pdv_length));
$pdv->decode($pdv_stream);
$this->pdvs[] = $pdv;
}
}
