| /*
|
| * Copyright 1999-2011 Alibaba Group.
|
| *
|
| * 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 com.alibaba.dubbo.common.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * UnsafeByteArrayInputStrem. |
| * |
| * @author qian.lei |
| */ |
| |
| 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); |
| } |
| |
| public int read() |
| { |
| return ( mPosition < mLimit ) ? ( mData[mPosition++] & 0xff ) : -1; |
| } |
| |
| 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; |
| } |
| |
| public long skip(long len) |
| { |
| if( mPosition + len > mLimit ) |
| len = mLimit - mPosition; |
| if( len <= 0 ) |
| return 0; |
| mPosition += len; |
| return len; |
| } |
| |
| public int available() |
| { |
| return mLimit - mPosition; |
| } |
| |
| public boolean markSupported() |
| { |
| return true; |
| } |
| |
| public void mark(int readAheadLimit) |
| { |
| mMark = mPosition; |
| } |
| |
| public void reset() |
| { |
| mPosition = mMark; |
| } |
| |
| 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; |
| } |
| } |