org.bouncycastle.tsp.ers.ERSFileData Maven / Gradle / Ivy
package org.bouncycastle.tsp.ers;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.bouncycastle.operator.DigestCalculator;
/**
* Generic class for holding a File of data for RFC 4998 ERS.
*/
public class ERSFileData
extends ERSCachingData
{
private final File content;
public ERSFileData(File content)
throws FileNotFoundException
{
if (content.isDirectory())
{
throw new IllegalArgumentException("directory not allowed as ERSFileData");
}
if (!content.exists())
{
throw new FileNotFoundException(content.getAbsolutePath() + " does not exist");
}
if (!content.canRead())
{
throw new FileNotFoundException(content.getAbsolutePath() + " is not readable");
}
this.content = content;
}
protected byte[] calculateHash(DigestCalculator digestCalculator)
{
try
{
InputStream contentStream = new FileInputStream(content);
byte[] hash = ERSUtil.calculateDigest(digestCalculator, contentStream);
contentStream.close();
return hash;
}
catch (IOException e)
{
throw new IllegalStateException("unable to process " + content.getAbsolutePath());
}
}
}