/**
* Reads a part of response body encoded with chunked Transfer-Encoding
*
* @param int $bufferSize buffer size to use for reading
*
* @return string
* @throws HTTP_Request2_MessageException
*/
protected function readChunked($bufferSize)
{
// at start of the next chunk?
if (0 == $this->chunkLength) {
$line = $this->socket->readLine($bufferSize);
if ('' === $line && $this->socket->eof()) {
$this->chunkLength = -1;
// indicate missing chunk
return '';
} elseif (!preg_match('/^([0-9a-f]+)/i', $line, $matches)) {
throw new HTTP_Request2_MessageException("Cannot decode chunked response, invalid chunk length '{$line}'", HTTP_Request2_Exception::DECODE_ERROR);
} else {
$this->chunkLength = hexdec($matches[1]);
// Chunk with zero length indicates the end
if (0 == $this->chunkLength) {
$this->socket->readLine($bufferSize);
return '';
}
}
}
$data = $this->socket->read(min($this->chunkLength, $bufferSize));
$this->chunkLength -= strlen($data);
if (0 == $this->chunkLength) {
$this->socket->readLine($bufferSize);
// Trailing CRLF
}
return $data;
}
