Fix reading fields with null flags

Fix #93

src/main/java/com/linuxense/javadbf/DBFUtils.java

@@ -32,6 +32,8 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.math.BigDecimal;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.nio.charset.Charset;
 import java.nio.charset.CharsetEncoder;
 import java.text.DecimalFormat;
@@ -410,14 +412,16 @@ protected static byte[] readAllBytes(File file) throws IOException {
 	}
 
 	protected static BitSet getBitSet(byte[] bytes) {
-//		return BitSet.valueOf(bytes);
+//		return  BitSet.valueOf(bytes);
+
 		BitSet bits = new BitSet();
 	    for (int i = 0; i < bytes.length * 8; i++) {
-	      if ((bytes[bytes.length - i / 8 - 1] & (1 << (i % 8))) > 0) {
+	      byte b = bytes[i/8];
+	      int bit = (b & (1 << (i % 8)));
+	      if (bit > 0) {
 	        bits.set(i);
 	      }
 	    }
 	    return bits;
 	}
-
 }

src/test/java/com/linuxense/javadbf/bug93nullfield/Bug99NullFieldTest.java

@@ -0,0 +1,36 @@
+package com.linuxense.javadbf.bug93nullfield;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.linuxense.javadbf.DBFReader;
+import com.linuxense.javadbf.DBFRow;
+import com.linuxense.javadbf.DBFUtils;
+
+public class Bug99NullFieldTest {
+
+	public Bug99NullFieldTest() {
+		super();
+	}
+
+	@Test
+	public void testBug() throws FileNotFoundException {
+		File testFile = new File("src/test/resources/bug93_null_field/testfile.dbf");
+
+		DBFReader reader = null;
+		try {
+			reader = new DBFReader(new FileInputStream(testFile));
+			reader.setTrimRightSpaces(false);
+			DBFRow row = reader.nextRow();
+			String value = row.getString("REQNAME");
+			Assert.assertNotNull(value);
+		}
+		finally {
+			DBFUtils.close(reader);
+		}
+	}
+}