/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
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**************************************************************************/
/**
* $Id: CheckedInputStream.java,v 1.2 2006/02/17 10:53:19 cvs Exp $
*/
package java.util.zip;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
public class CheckedInputStream extends FilterInputStream {
private Checksum checksum;
public CheckedInputStream(InputStream in, Checksum cs) {
super(in);
if (cs == null) {
throw new NullPointerException();
}
checksum = cs;
}
public Checksum getChecksum() {
return checksum;
}
public int read() throws IOException {
int rd = in.read();
if (rd != -1) {
checksum.update(rd);
}
return rd;
}
public int read(byte [] buf, int offset, int len) throws IOException {
int rd = in.read(buf, offset, len);
if (rd != -1) {
checksum.update(buf, offset, rd);
}
return rd;
}
public long skip(long n) throws IOException {
if (n < 0) {
throw new IllegalArgumentException();
}
long skipped = 0;
int count=(n > 1024 ? 1024 : (int)n);;
byte [] buf = new byte[count];
int rd;
while (n > 0) {
rd = in.read(buf, 0, count);
if (rd != -1) {
skipped += rd;
checksum.update(buf, 0, rd);
n -= rd;
}
else {
break;
}
}
return skipped;
}
}