private long getDataLength(long dataPos) {
byte[] dataLengthBytes = new byte[4];
forkStream.readFrom(dataPos, dataLengthBytes);
return Util.unsign(Util.readIntBE(dataLengthBytes));
}
public ResourceHeader getHeader() {
byte[] headerData = new byte[ResourceHeader.length()];
forkStream.readFullyFrom(0, headerData);
return new ResourceHeader(headerData, 0);
}