/*
* @(#)$Id: FastByteArrayInputStream.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
//package xbird.util.io;
import java.io.InputStream;
/**
* ByteArrayInputStream implementation that does not synchronize methods.
*/
public final class FastByteArrayInputStream extends InputStream {
protected/* final */byte[] buf;
protected/* final */int count;
protected int pos = 0;
public FastByteArrayInputStream() {}
public FastByteArrayInputStream(byte[] buf) {
this(buf, buf.length);
}
public FastByteArrayInputStream(byte[] buf, int count) {
this.buf = buf;
this.count = count;
}
public FastByteArrayInputStream(byte buf[], int offset, int length) {
this.buf = buf;
this.pos = offset;
this.count = Math.min(offset + length, buf.length);
}
public void init(byte[] buf) {
init(buf, buf.length);
}
public void init(byte[] buf, int count) {
this.buf = buf;
this.count = count;
this.pos = 0;
}
@Override
public final int available() {
return count - pos;
}
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);
}
if(len <= 0) {
return 0;
}
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;
}
@Override
public boolean markSupported() {
return false;
}
@Override
public void mark(int readlimit) {
throw new UnsupportedOperationException();
}
}
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