/* | |
* 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.myfaces.util.lang; | |
import java.io.InputStream; | |
/** | |
* ByteArrayInputStream implementation that does not synchronize methods. | |
*/ | |
public class FastByteArrayInputStream extends InputStream | |
{ | |
/** | |
* Our byte buffer | |
*/ | |
protected byte[] buf = null; | |
/** | |
* Number of bytes that we can read from the buffer | |
*/ | |
protected int count = 0; | |
/** | |
* Number of bytes that have been read from the buffer | |
*/ | |
protected int pos = 0; | |
public FastByteArrayInputStream(byte[] buf, int count) | |
{ | |
this.buf = buf; | |
this.count = count; | |
} | |
@Override | |
public final int available() | |
{ | |
return count - pos; | |
} | |
@Override | |
public final int read() | |
{ | |
return pos < count ? (buf[pos++] & 0xff) : -1; | |
} | |
@Override | |
public final int read(byte[] b, int off, int len) | |
{ | |
if (pos >= count) | |
{ | |
return -1; | |
} | |
if ((pos + len) > count) | |
{ | |
len = count - pos; | |
} | |
System.arraycopy(buf, pos, b, off, len); | |
pos += len; | |
return len; | |
} | |
@Override | |
public final long skip(long n) | |
{ | |
if ((pos + n) > count) | |
{ | |
n = count - pos; | |
} | |
if (n < 0) | |
{ | |
return 0; | |
} | |
pos += n; | |
return n; | |
} | |
} |