Source Code : Uses CRC32 algorithm for creating fingerprint.

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Uses CRC32 algorithm for creating fingerprint.

     
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.zip.CRC32;
import java.util.zip.Checksum;

/**
 * Uses CRC32 algorithm for creating fingerprint.
 * 
 * @author Alex Objelean
 */
public class CRC32HashBuilder {

  /**
   * {@inheritDoc}
   */
  public String getHash(final InputStream input) throws IOException {
    if (input == null) {
      throw new IllegalArgumentException("Content cannot be null!");
    }
    final Checksum checksum = new CRC32();
    final byte[] bytes = new byte[1024];
    int len = 0;
    while ((len = input.read(bytes)) >= 0) {
      checksum.update(bytes, 0, len);
    }

    final String hash = new BigInteger(Long.toString(checksum.getValue()))
        .toString(16);
    return hash;
  }
}

   
    
    
    
    
  

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