package org.xbib.io.compress.xz;
import org.xbib.io.compress.xz.delta.DeltaEncoder;
import java.io.IOException;
class DeltaOutputStream extends FinishableOutputStream {
private static final int TMPBUF_SIZE = 4096;
private FinishableOutputStream out;
private final DeltaEncoder delta;
private final byte[] tmpbuf = new byte[TMPBUF_SIZE];
private boolean finished = false;
private IOException exception = null;
static int getMemoryUsage() {
return 1 + TMPBUF_SIZE / 1024;
}
DeltaOutputStream(FinishableOutputStream out, DeltaOptions options) {
this.out = out;
delta = new DeltaEncoder(options.getDistance());
}
public void write(int b) throws IOException {
byte[] buf = new byte[1];
buf[0] = (byte) b;
write(buf, 0, 1);
}
public void write(byte[] buf, int off, int len) throws IOException {
if (off < 0 || len < 0 || off + len < 0 || off + len > buf.length) {
throw new IndexOutOfBoundsException();
}
if (exception != null) {
throw exception;
}
if (finished) {
throw new XZIOException("Stream finished");
}
try {
while (len > TMPBUF_SIZE) {
delta.encode(buf, off, TMPBUF_SIZE, tmpbuf);
out.write(tmpbuf);
off += TMPBUF_SIZE;
len -= TMPBUF_SIZE;
}
delta.encode(buf, off, len, tmpbuf);
out.write(tmpbuf, 0, len);
} catch (IOException e) {
exception = e;
throw e;
}
}
public void flush() throws IOException {
if (exception != null) {
throw exception;
}
if (finished) {
throw new XZIOException("Stream finished or closed");
}
try {
out.flush();
} catch (IOException e) {
exception = e;
throw e;
}
}
public void finish() throws IOException {
if (!finished) {
if (exception != null) {
throw exception;
}
try {
out.finish();
} catch (IOException e) {
exception = e;
throw e;
}
finished = true;
}
}
public void close() throws IOException {
if (out != null) {
try {
out.close();
} catch (IOException e) {
if (exception == null) {
exception = e;
}
}
out = null;
}
if (exception != null) {
throw exception;
}
}
}