[CSV-234] Enable escaping of quotes in Clobs

Author: luyseyal

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -1240,8 +1240,7 @@ private void print(final Reader reader, final Appendable out, final boolean newR
             out.append(getDelimiter());
         }
         if (isQuoteCharacterSet()) {
-            // the original object is needed so can check for Number
-            printWithQuotes(reader, out, newRecord);
+            printWithQuotes(reader, out);
         } else if (isEscapeCharacterSet()) {
             printWithEscapes(reader, out);
         } else if (out instanceof Writer) {
@@ -1501,18 +1500,43 @@ private void printWithQuotes(final Object object, final CharSequence value, fina
      *
      * @throws IOException
      */
-    private void printWithQuotes(final Reader reader, final Appendable out, final boolean newRecord)
-            throws IOException {
-        final char quoteChar = getQuoteCharacter().charValue();
+    private void printWithQuotes(final Reader reader, final Appendable out) throws IOException {
 
         if (getQuoteMode() == QuoteMode.NONE) {
             printWithEscapes(reader, out);
             return;
         }
 
-        out.append(quoteChar);
-        IOUtils.copy(reader, out);
-        out.append(quoteChar);
+        int pos = 0;
+
+        final char quote = getQuoteCharacter().charValue();
+        final StringBuilder builder = new StringBuilder(IOUtils.DEFAULT_BUFFER_SIZE);
+
+        out.append(quote);
+
+        int c;
+        while (-1 != (c = reader.read())) {
+            builder.append((char) c);
+            if (c == quote) {
+                // write out segment up until this char
+                if (pos > 0) {
+                    out.append(builder.substring(0, pos));
+                    builder.setLength(0);
+                    pos = -1;
+                }
+
+                out.append(quote);
+                out.append((char) c);
+            }
+            pos++;
+        }
+
+        // write last segment
+        if (pos > 0) {
+            out.append(builder.substring(0, pos));
+        }
+
+        out.append(quote);
     }
 
     @Override

src/test/java/org/apache/commons/csv/CSVPrinterTest.java

@@ -219,8 +219,11 @@ private void setUpTable(final Connection connection) throws SQLException {
         try (final Statement statement = connection.createStatement()) {
             statement.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255), TEXT CLOB)");
             statement.execute("insert into TEST values(1, 'r1', 'long text 1')");
-            longText2 = StringUtils.repeat('a', (IOUtils.DEFAULT_BUFFER_SIZE * 2) + 1);
+            longText2 = StringUtils.repeat('a', IOUtils.DEFAULT_BUFFER_SIZE - 4);
+            longText2 += "\"\r\n\"a\"";
+            longText2 += StringUtils.repeat('a', IOUtils.DEFAULT_BUFFER_SIZE - 1);
             statement.execute("insert into TEST values(2, 'r2', '" + longText2 + "')");
+            longText2 = longText2.replace("\"","\"\"");
         }
     }