public void seekRelative(long relativeOffset) throws IOException {
ensureReadyOnFirstUse();
long pos = streamDataInput.getAbsolutePosition();
pos += relativeOffset;
if (pos < filePositionOfStreamData) pos = filePositionOfStreamData;
// It's alright to seek beyond the end, it's just that read operations will fail
streamDataInput.seekAbsolute(pos);
}
private void ensureReadyOnFirstUse() throws IOException {
beginThreadAccess();
if (usedYet) return;
usedYet = true;
// System.out.println("SICW.ensureReadyOnFirstUse() About to ... " + this);
filePositionBeforeUse = streamDataInput.getAbsolutePosition();
streamDataInput.seekAbsolute(filePositionOfStreamData);
// System.out.println("SICW.ensureReadyOnFirstUse() ... Done " + this);
}
private long getBytesRemaining() throws IOException {
long absPos = streamDataInput.getAbsolutePosition();
if (absPos < filePositionOfStreamData) return -1;
long end = filePositionOfStreamData + lengthOfStreamData;
return end - absPos;
}