ca.uhn.fhir.util.CountingAndLimitingInputStream Maven / Gradle / Ivy
/*-
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2024 Smile CDR, Inc.
* %%
* 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.
* #L%
*/
package ca.uhn.fhir.util;
import ca.uhn.fhir.i18n.Msg;
import com.google.common.io.CountingInputStream;
import java.io.IOException;
import java.io.InputStream;
public class CountingAndLimitingInputStream extends InputStream {
private final int myMaxBytes;
private final CountingInputStream myWrap;
@Override
public int read() throws IOException {
int retVal = myWrap.read();
validateCount();
return retVal;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int retVal = myWrap.read(b, off, len);
validateCount();
return retVal;
}
@Override
public int read(byte[] theRead) throws IOException {
int retVal = myWrap.read(theRead);
validateCount();
return retVal;
}
private void validateCount() throws IOException {
if (myWrap.getCount() > myMaxBytes) {
throw new IOException(Msg.code(1807) + "Stream exceeds maximum allowable size: " + myMaxBytes);
}
}
/**
* Wraps another input stream, counting the number of bytes read.
*
* @param theWrap the input stream to be wrapped
*/
public CountingAndLimitingInputStream(InputStream theWrap, int theMaxBytes) {
myWrap = new CountingInputStream(theWrap);
myMaxBytes = theMaxBytes;
}
}