* @param rpmIS raw input stream of the rpm
* @return the "proper" input stream
* @throws IOException an IO error occurred
*/
public static InputStream openPayloadStream(Header header, InputStream rpmIS) throws IOException {
Entry pcEntry = header.getEntry(HeaderTag.PAYLOADCOMPRESSOR);
String[] pc = (String[]) pcEntry.getValues();
PayloadCompressionType pcType = PayloadCompressionType.valueOf(pc[0]);
InputStream payloadIS = rpmIS;
switch (pcType) {
case none:
break;