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/*
* Copyright (C) 2021 Thomas Wolf <thomas.wolf@paranor.ch> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.util.io;
import java.io.IOException;
import java.io.OutputStream;
import org.eclipse.jgit.util.Base85;
/**
* An {@link OutputStream} that encodes data for a git binary patch.
*
* @since 5.12
*/
public class BinaryHunkOutputStream extends OutputStream {
private static final int MAX_BYTES = 52;
private final OutputStream out;
private final byte[] buffer = new byte[MAX_BYTES];
private int pos;
/**
* Creates a new {@link BinaryHunkOutputStream}.
*
* @param out
* {@link OutputStream} to write the encoded data to
*/
public BinaryHunkOutputStream(OutputStream out) {
this.out = out;
}
/**
* Flushes and closes this stream, and closes the underlying
* {@link OutputStream}.
*/
@Override
public void close() throws IOException {
flush();
out.close();
}
/**
* Writes any buffered output as a binary patch line to the underlying
* {@link OutputStream} and flushes that stream, too.
*/
@Override
public void flush() throws IOException {
if (pos > 0) {
encode(buffer, 0, pos);
pos = 0;
}
out.flush();
}
@Override
public void write(int b) throws IOException {
buffer[pos++] = (byte) b;
if (pos == buffer.length) {
encode(buffer, 0, pos);
pos = 0;
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (len == 0) {
return;
}
int toCopy = len;
int in = off;
if (pos > 0) {
// Fill the buffer
int chunk = Math.min(toCopy, buffer.length - pos);
System.arraycopy(b, in, buffer, pos, chunk);
in += chunk;
pos += chunk;
toCopy -= chunk;
if (pos == buffer.length) {
encode(buffer, 0, pos);
pos = 0;
}
if (toCopy == 0) {
return;
}
}
while (toCopy >= MAX_BYTES) {
encode(b, in, MAX_BYTES);
toCopy -= MAX_BYTES;
in += MAX_BYTES;
}
if (toCopy > 0) {
System.arraycopy(b, in, buffer, 0, toCopy);
pos = toCopy;
}
}
private void encode(byte[] data, int off, int length) throws IOException {
if (length <= 26) {
out.write('A' + length - 1);
} else {
out.write('a' + length - 27);
}
out.write(Base85.encode(data, off, length));
out.write('\n');
}
}
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