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package jogamp.opengl.util.pngj;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* stream that outputs to memory and allows to flush fragments every 'size' bytes to some other destination
*/
abstract class ProgressiveOutputStream extends ByteArrayOutputStream {
private final int size;
public ProgressiveOutputStream(int size) {
this.size = size;
}
@Override
public final void close() throws IOException {
flush();
super.close();
}
@Override
public final void flush() throws IOException {
super.flush();
checkFlushBuffer(true);
}
@Override
public final void write(byte[] b, int off, int len) {
super.write(b, off, len);
checkFlushBuffer(false);
}
@Override
public final void write(byte[] b) throws IOException {
super.write(b);
checkFlushBuffer(false);
}
@Override
public final void write(int arg0) {
super.write(arg0);
checkFlushBuffer(false);
}
@Override
public final synchronized void reset() {
super.reset();
}
/**
* if it's time to flush data (or if forced==true) calls abstract method flushBuffer() and cleans those bytes from
* own buffer
*/
private final void checkFlushBuffer(boolean forced) {
while (forced || count >= size) {
int nb = size;
if (nb > count)
nb = count;
if (nb == 0)
return;
flushBuffer(buf, nb);
int bytesleft = count - nb;
count = bytesleft;
if (bytesleft > 0)
System.arraycopy(buf, nb, buf, 0, bytesleft);
}
}
public abstract void flushBuffer(byte[] b, int n);
}
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