com.sun.webkit.SimpleSharedBufferInputStream Maven / Gradle / Ivy
/*
* Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.webkit;
import java.io.InputStream;
public final class SimpleSharedBufferInputStream extends InputStream {
private final SharedBuffer sharedBuffer;
private long position;
public SimpleSharedBufferInputStream(SharedBuffer sharedBuffer) {
if (sharedBuffer == null) {
throw new NullPointerException("sharedBuffer is null");
}
this.sharedBuffer = sharedBuffer;
}
@Override
public int read() {
byte[] buffer = new byte[1];
int length = sharedBuffer.getSomeData(position, buffer, 0, 1);
if (length != 0) {
position++;
return buffer[0] & 0xff;
} else {
return -1;
}
}
@Override
public int read(byte[] b, int off, int len) {
if (b == null) {
throw new NullPointerException("b is null");
}
if (off < 0) {
throw new IndexOutOfBoundsException("off is negative");
}
if (len < 0) {
throw new IndexOutOfBoundsException("len is negative");
}
if (len > b.length - off) {
throw new IndexOutOfBoundsException(
"len is greater than b.length - off");
}
if (len == 0) {
return 0;
}
int length = sharedBuffer.getSomeData(position, b, off, len);
if (length != 0) {
position += length;
return length;
} else {
return -1;
}
}
@Override
public long skip(long n) {
long k = sharedBuffer.size() - position;
if (n < k) {
k = n < 0 ? 0 : n;
}
position += k;
return k;
}
@Override
public int available() {
return (int) Math.min(sharedBuffer.size() - position,
Integer.MAX_VALUE);
}
}