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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.codec.binary;
import static org.apache.commons.codec.binary.BaseNCodec.EOF;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Objects;
import org.apache.commons.codec.binary.BaseNCodec.Context;
/**
* Abstract superclass for Base-N output streams.
*
* To write the EOF marker without closing the stream, call {@link #eof()} or use an Apache Commons IO CloseShieldOutputStream.
*
*
* @since 1.5
*/
public class BaseNCodecOutputStream extends FilterOutputStream {
private final boolean doEncode;
private final BaseNCodec baseNCodec;
private final byte[] singleByte = new byte[1];
private final Context context = new Context();
/**
* TODO should this be protected?
*
* @param output the underlying output or null.
* @param basedCodec a BaseNCodec.
* @param doEncode true to encode, false to decode, TODO should be an enum?
*/
public BaseNCodecOutputStream(final OutputStream output, final BaseNCodec basedCodec, final boolean doEncode) {
super(output);
this.baseNCodec = basedCodec;
this.doEncode = doEncode;
}
/**
* Closes this output stream and releases any system resources associated with the stream.
*
* To write the EOF marker without closing the stream, call {@link #eof()} or use an
* Apache Commons IO CloseShieldOutputStream.
*
*
* @throws IOException
* if an I/O error occurs.
*/
@Override
public void close() throws IOException {
eof();
flush();
out.close();
}
/**
* Writes EOF.
*
* @throws IOException
* if an I/O error occurs.
* @since 1.11
*/
public void eof() throws IOException {
// Notify encoder of EOF (-1).
if (doEncode) {
baseNCodec.encode(singleByte, 0, EOF, context);
} else {
baseNCodec.decode(singleByte, 0, EOF, context);
}
}
/**
* Flushes this output stream and forces any buffered output bytes to be written out to the stream.
*
* @throws IOException
* if an I/O error occurs.
*/
@Override
public void flush() throws IOException {
flush(true);
}
/**
* Flushes this output stream and forces any buffered output bytes to be written out to the stream. If propagate is
* true, the wrapped stream will also be flushed.
*
* @param propagate
* boolean flag to indicate whether the wrapped OutputStream should also be flushed.
* @throws IOException
* if an I/O error occurs.
*/
private void flush(final boolean propagate) throws IOException {
final int avail = baseNCodec.available(context);
if (avail > 0) {
final byte[] buf = new byte[avail];
final int c = baseNCodec.readResults(buf, 0, avail, context);
if (c > 0) {
out.write(buf, 0, c);
}
}
if (propagate) {
out.flush();
}
}
/**
* Returns true if decoding behavior is strict. Decoding will raise an
* {@link IllegalArgumentException} if trailing bits are not part of a valid encoding.
*
* The default is false for lenient encoding. Decoding will compose trailing bits
* into 8-bit bytes and discard the remainder.
*
* @return true if using strict decoding
* @since 1.15
*/
public boolean isStrictDecoding() {
return baseNCodec.isStrictDecoding();
}
/**
* Writes {@code len} bytes from the specified {@code b} array starting at {@code offset} to this
* output stream.
*
* @param array
* source byte array
* @param offset
* where to start reading the bytes
* @param len
* maximum number of bytes to write
*
* @throws IOException
* if an I/O error occurs.
* @throws NullPointerException
* if the byte array parameter is null
* @throws IndexOutOfBoundsException
* if offset, len or buffer size are invalid
*/
@Override
public void write(final byte array[], final int offset, final int len) throws IOException {
Objects.requireNonNull(array, "array");
if (offset < 0 || len < 0) {
throw new IndexOutOfBoundsException();
} else if (offset > array.length || offset + len > array.length) {
throw new IndexOutOfBoundsException();
} else if (len > 0) {
if (doEncode) {
baseNCodec.encode(array, offset, len, context);
} else {
baseNCodec.decode(array, offset, len, context);
}
flush(false);
}
}
/**
* Writes the specified {@code byte} to this output stream.
*
* @param i
* source byte
* @throws IOException
* if an I/O error occurs.
*/
@Override
public void write(final int i) throws IOException {
singleByte[0] = (byte) i;
write(singleByte, 0, 1);
}
}