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The Enterprise Security API (ESAPI) project is an OWASP project to create simple strong security controls for every web platform. Security controls are not simple to build. You can read about the hundreds of pitfalls for unwary developers on the OWASP website. By providing developers with a set of strong controls, we aim to eliminate some of the complexity of creating secure web applications. This can result in significant cost savings across the SDLC.

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/**
 * OWASP Enterprise Security API (ESAPI)
 *
 * This file is part of the Open Web Application Security Project (OWASP)
 * Enterprise Security API (ESAPI) project. For details, please see
 * http://www.owasp.org/index.php/ESAPI.
 *
 * Copyright (c) 2007 - The OWASP Foundation
 *
 * The ESAPI is published by OWASP under the BSD license. You should read and accept the
 * LICENSE before you use, modify, and/or redistribute this software.
 */
package org.owasp.esapi.codecs;


/**
 * Implementation of the Codec interface for DB2 strings. This function will only protect you from SQLi in limited situations.
 * 
 * @author Sivasankar Tanakala ([email protected])
 * @since October 26, 2010
 * @see org.owasp.esapi.Encoder
 */
public class DB2Codec extends Codec {

	public String encodeCharacter(char[] immune, Character c) {

		if (c.charValue() == '\'')
			return "\'\'";

		if (c.charValue() == ';')
			return ".";

		return "" + c;
	}

	public Character decodeCharacter(PushbackString input) {

		input.mark();
		Character first = input.next();

		if (first == null) {
			input.reset();
			return null;
		}

		// if this is not an encoded character, return null

		if (first.charValue() != '\'') {
			input.reset();
			return null;
		}

		Character second = input.next();

		if (second == null) {
			input.reset();
			return null;
		}

		// if this is not an encoded character, return null
		if (second.charValue() != '\'') {
			input.reset();
			return null;
		}

		return (Character.valueOf('\''));
	}
}