org.glowroot.central.util.ByteBufferInputStream Maven / Gradle / Ivy
/*
* Copyright 2015-2017 the original author or authors.
*
* Licensed 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.glowroot.central.util;
import java.io.InputStream;
import java.nio.ByteBuffer;
class ByteBufferInputStream extends InputStream {
private final ByteBuffer byteBuf;
ByteBufferInputStream(ByteBuffer byteBuf) {
this.byteBuf = byteBuf;
}
@Override
public int read() {
if (!byteBuf.hasRemaining()) {
return -1;
}
// convert byte to int in 0..255 range
return byteBuf.get() & 0xFF;
}
@Override
public int read(byte[] bytes, int off, int len) {
int count = Math.min(byteBuf.remaining(), len);
if (count == 0) {
return -1;
}
byteBuf.get(bytes, off, len);
return count;
}
@Override
public int available() {
return byteBuf.remaining();
}
}