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/*
* DeltaOutputStream
*
* Author: Lasse Collin <lasse.collin@tukaani.org>
*
* This file has been put into the public domain.
* You can do whatever you want with this file.
*/
package org.tukaani.xz;
import java.io.IOException;
import org.tukaani.xz.delta.DeltaEncoder;
class DeltaOutputStream extends FinishableOutputStream {
private static final int FILTER_BUF_SIZE = 4096;
private FinishableOutputStream out;
private final DeltaEncoder delta;
private final byte[] filterBuf = new byte[FILTER_BUF_SIZE];
private boolean finished = false;
private IOException exception = null;
private final byte[] tempBuf = new byte[1];
static int getMemoryUsage() {
return 1 + FILTER_BUF_SIZE / 1024;
}
DeltaOutputStream(FinishableOutputStream out, DeltaOptions options) {
this.out = out;
delta = new DeltaEncoder(options.getDistance());
}
public void write(int b) throws IOException {
tempBuf[0] = (byte)b;
write(tempBuf, 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 > FILTER_BUF_SIZE) {
delta.encode(buf, off, FILTER_BUF_SIZE, filterBuf);
out.write(filterBuf);
off += FILTER_BUF_SIZE;
len -= FILTER_BUF_SIZE;
}
delta.encode(buf, off, len, filterBuf);
out.write(filterBuf, 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;
}
}
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