/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.hc.core5.http2.impl.io;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayDeque;
import java.util.Queue;
class MultiByteArrayInputStream extends InputStream {
private final Queue bufs;
private byte[] current;
private int pos;
public MultiByteArrayInputStream(final byte[]... bufs) {
super();
this.bufs = new ArrayDeque<>();
for (byte[] buf: bufs) {
if (buf.length > 0) {
this.bufs.add(buf);
}
}
}
private void advance() {
if (this.current != null) {
if (this.pos >= this.current.length) {
this.current = null;
}
}
if (this.current == null) {
this.current = this.bufs.poll();
this.pos = 0;
}
}
@Override
public int read() throws IOException {
advance();
if (this.current == null) {
return -1;
}
return this.current[this.pos++];
}
@Override
public int read(final byte b[], final int off, final int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
}
advance();
if (this.current == null) {
return -1;
}
final int chunk = Math.min(this.current.length - this.pos, len);
if (chunk <= 0) {
return 0;
}
System.arraycopy(this.current, this.pos, b, off, chunk);
this.pos += chunk;
return chunk;
}
@Override
public long skip(final long n) {
advance();
final int chunk = Math.min(this.current.length - this.pos, (int) n);
if (chunk <= 0) {
return 0;
}
this.pos += chunk;
return chunk;
}
@Override
public int available() {
advance();
return this.current != null ? this.current.length - this.pos : 0;
}
@Override
public boolean markSupported() {
return false;
}
}