/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.util;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
/**
* This is similar to a ByteArrayInputStream but instead wraps a ByteBuffer
*/
public class ByteBufferInputStream extends InputStream {
private final ByteBuffer buf;
public ByteBufferInputStream(ByteBuffer buf) {
this.buf = buf.asReadOnlyBuffer();
}
@Override
public int read() throws IOException {
try {
return buf.get();
} catch (BufferUnderflowException e) {
throw new EOFException();
}
}
@Override
public int read(byte[] bytes, int off, int len) throws IOException {
// Read only what's left
len = Math.min(len, buf.remaining());
try {
buf.get(bytes, off, len);
} catch (BufferUnderflowException e) {
throw new EOFException();
}
return len;
}
@Override
public int available() {
return buf.remaining();
}
}