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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.dubbo.common.io;
import java.io.IOException;
import java.io.InputStream;
/**
* UnsafeByteArrayInputStream.
*/
public class UnsafeByteArrayInputStream extends InputStream {
protected byte[] mData;
protected int mPosition, mLimit, mMark = 0;
public UnsafeByteArrayInputStream(byte[] buf) {
this(buf, 0, buf.length);
}
public UnsafeByteArrayInputStream(byte[] buf, int offset) {
this(buf, offset, buf.length - offset);
}
public UnsafeByteArrayInputStream(byte[] buf, int offset, int length) {
mData = buf;
mPosition = mMark = offset;
mLimit = Math.min(offset + length, buf.length);
}
@Override
public int read() {
return (mPosition < mLimit) ? (mData[mPosition++] & 0xff) : -1;
}
@Override
public int read(byte[] b, int off, int len) {
if (b == null) {
throw new NullPointerException();
}
if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
}
if (mPosition >= mLimit) {
return -1;
}
if (mPosition + len > mLimit) {
len = mLimit - mPosition;
}
if (len <= 0) {
return 0;
}
System.arraycopy(mData, mPosition, b, off, len);
mPosition += len;
return len;
}
@Override
public long skip(long len) {
if (mPosition + len > mLimit) {
len = mLimit - mPosition;
}
if (len <= 0) {
return 0;
}
mPosition += len;
return len;
}
@Override
public int available() {
return mLimit - mPosition;
}
@Override
public boolean markSupported() {
return true;
}
@Override
public void mark(int readAheadLimit) {
mMark = mPosition;
}
@Override
public void reset() {
mPosition = mMark;
}
@Override
public void close() throws IOException {
}
public int position() {
return mPosition;
}
public void position(int newPosition) {
mPosition = newPosition;
}
public int size() {
return mData == null ? 0 : mData.length;
}
}