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/*
* Copyright 2011 Vaadin Ltd.
*
* 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.vaadin.sass.internal.util;
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;
}
}
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