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import java.util.zip.CheckedInputStream;
import java.util.zip.CRC32;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
/**
* -----------------------------------------------------------------------------
* Used to provide an example of how to calculate the checksum of a file using
* the CRC-32 checksum engine.
*
* @version 1.0
* @author Jeffrey M. Hunter (jhunter@idevelopment.info)
* @author <a href="http://www.idevelopment.info">http://www.idevelopment.info
* -----------------------------------------------------------------------------
*/
public class ChecksumCRC32 {
private static void doChecksum(String fileName) {
try {
CheckedInputStream cis = null;
long fileSize = 0;
try {
// Computer CRC32 checksum
cis = new CheckedInputStream(
new FileInputStream(fileName), new CRC32());
fileSize = new File(fileName).length();
} catch (FileNotFoundException e) {
System.err.println("File not found.");
System.exit(1);
}
byte[] buf = new byte[128];
while(cis.read(buf) >= 0) {
}
long checksum = cis.getChecksum().getValue();
System.out.println(checksum + " " + fileSize + " " + fileName);
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Sole entry point to the class and application.
* @param args Array of String arguments.
*/
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage: java ChecksumCRC32 filename");
} else {
doChecksum(args[0]);
}
}
}