/**
* Method used to rewrap a GTSWrapper, typically to change the compression settings.
*
* @param wrapper
* @param compress
* @param compratio
* @return
*/
public static GTSWrapper rewrap(GTSWrapper wrapper, boolean compress, double compratio) {
byte[] unwrapped = unwrapEncoded(wrapper);
GTSEncoder encoder = new GTSEncoder(wrapper.getBase(), null, unwrapped);
GTSWrapper tmp = fromGTSEncoderToGTSWrapper(encoder, compress, compratio);
GTSWrapper rewrapped = new GTSWrapper(wrapper);
rewrapped.setCompressed(tmp.isCompressed());
rewrapped.setCompressionPasses(tmp.getCompressionPasses());
rewrapped.setEncoded(tmp.getEncoded());
return rewrapped;
}
/**
* Extract the encoded data, removing compression if needed
*
* @param wrapper from which to extract the encoded data
* @return the raw encoded data
*/
private static byte[] unwrapEncoded(GTSWrapper wrapper) {
if (!wrapper.isCompressed()) {
return wrapper.getEncoded();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = wrapper.getEncoded();
int pass = wrapper.getCompressionPasses();
while (pass > 0) {
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
baos.reset();
try {
GZIPInputStream gzis = new GZIPInputStream(in);
byte[] buf = new byte[1024];
while (true) {
int len = gzis.read(buf);
if (len < 0) {
break;
}
baos.write(buf, 0, len);
}
gzis.close();
} catch (IOException ioe) {
throw new RuntimeException("Invalid compressed content.");
}
bytes = baos.toByteArray();
pass--;
}
return bytes;
}