/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.codec.binary;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.math.BigInteger;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Random;

import org.apache.commons.codec.CodecPolicy;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.lang3.ArrayUtils;
import org.junit.Assume;
import org.junit.Test;

/**
 * Test cases for Base64 class.
 *
 * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
 */
public class Base64Test {

    private static final Charset CHARSET_UTF8 = StandardCharsets.UTF_8;

    /**
     * Example test cases with valid characters but impossible combinations of
     * trailing characters (i.e. cannot be created during encoding).
     */
    static final String[] BASE64_IMPOSSIBLE_CASES = {
        "ZE==",
        "ZmC=",
        "Zm9vYE==",
        "Zm9vYmC=",
        "AB",
    };

    /**
     * Copy of the standard base-64 encoding table. Used to test decoding the final
     * character of encoded bytes.
     */
    private static final byte[] STANDARD_ENCODE_TABLE = {
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
    };

    private final Random random = new Random();

    /**
     * @return Returns the random.
     */
    public Random getRandom() {
        return this.random;
    }

    /**
     * Test the isStringBase64 method.
     */
    @Test
    public void testIsStringBase64() {
        final String nullString = null;
        final String emptyString = "";
        final String validString = "abc===defg\n\r123456\r789\r\rABC\n\nDEF==GHI\r\nJKL==============";
        final String invalidString = validString + (char) 0; // append null
                                                                // character

        try {
            Base64.isBase64(nullString);
            fail("Base64.isStringBase64() should not be null-safe.");
        } catch (final NullPointerException npe) {
            assertNotNull("Base64.isStringBase64() should not be null-safe.", npe);
        }

        assertTrue("Base64.isStringBase64(empty-string) is true", Base64.isBase64(emptyString));
        assertTrue("Base64.isStringBase64(valid-string) is true", Base64.isBase64(validString));
        assertFalse("Base64.isStringBase64(invalid-string) is false", Base64.isBase64(invalidString));
    }

    /**
     * Test the Base64 implementation
     */
    @Test
    public void testBase64() {
        final String content = "Hello World";
        String encodedContent;
        byte[] encodedBytes = Base64.encodeBase64(StringUtils.getBytesUtf8(content));
        encodedContent = StringUtils.newStringUtf8(encodedBytes);
        assertEquals("encoding hello world", "SGVsbG8gV29ybGQ=", encodedContent);

        Base64 b64 = new Base64(BaseNCodec.MIME_CHUNK_SIZE, null); // null
                                                                    // lineSeparator
                                                                    // same as
                                                                    // saying
                                                                    // no-chunking
        encodedBytes = b64.encode(StringUtils.getBytesUtf8(content));
        encodedContent = StringUtils.newStringUtf8(encodedBytes);
        assertEquals("encoding hello world", "SGVsbG8gV29ybGQ=", encodedContent);

        b64 = new Base64(0, null); // null lineSeparator same as saying
                                    // no-chunking
        encodedBytes = b64.encode(StringUtils.getBytesUtf8(content));
        encodedContent = StringUtils.newStringUtf8(encodedBytes);
        assertEquals("encoding hello world", "SGVsbG8gV29ybGQ=", encodedContent);

        // bogus characters to decode (to skip actually) {e-acute*6}
        final byte[] decode = b64.decode("SGVsbG{\u00e9\u00e9\u00e9\u00e9\u00e9\u00e9}8gV29ybGQ=");
        final String decodeString = StringUtils.newStringUtf8(decode);
        assertEquals("decode hello world", "Hello World", decodeString);
    }

    @Test
    public void testBase64AtBufferStart() {
        testBase64InBuffer(0, 100);
    }

    @Test
    public void testBase64AtBufferEnd() {
        testBase64InBuffer(100, 0);
    }

    @Test
    public void testBase64AtBufferMiddle() {
        testBase64InBuffer(100, 100);
    }

    private void testBase64InBuffer(final int startPasSize, final int endPadSize) {
        final String content = "Hello World";
        String encodedContent;
        final byte[] bytesUtf8 = StringUtils.getBytesUtf8(content);
        byte[] buffer = ArrayUtils.addAll(bytesUtf8, new byte[endPadSize]);
        buffer = ArrayUtils.addAll(new byte[startPasSize], buffer);
        final byte[] encodedBytes = new Base64().encode(buffer, startPasSize, bytesUtf8.length);
        encodedContent = StringUtils.newStringUtf8(encodedBytes);
        assertEquals("encoding hello world", "SGVsbG8gV29ybGQ=", encodedContent);
    }

    /**
     * Test our decode with pad character in the middle. (Our current
     * implementation: halt decode and return what we've got so far).
     *
     * The point of this test is not to say
     * "this is the correct way to decode base64." The point is simply to keep
     * us aware of the current logic since 1.4 so we don't accidentally break it
     * without realizing.
     *
     * Note for historians. The 1.3 logic would decode to:
     * "Hello World\u0000Hello World" -- null in the middle --- and 1.4
     * unwittingly changed it to current logic.
     */
    @Test
    public void testDecodeWithInnerPad() {
        final String content = "SGVsbG8gV29ybGQ=SGVsbG8gV29ybGQ=";
        final byte[] result = Base64.decodeBase64(content);
        final byte[] shouldBe = StringUtils.getBytesUtf8("Hello World");
        assertTrue("decode should halt at pad (=)", Arrays.equals(result, shouldBe));
    }

    /**
     * Tests Base64.encodeBase64().
     */
    @Test
    public void testChunkedEncodeMultipleOf76() {
        final byte[] expectedEncode = Base64.encodeBase64(BaseNTestData.DECODED, true);
        // convert to "\r\n" so we're equal to the old openssl encoding test
        // stored
        // in Base64TestData.ENCODED_76_CHARS_PER_LINE:
        final String actualResult = Base64TestData.ENCODED_76_CHARS_PER_LINE.replaceAll("\n", "\r\n");
        final byte[] actualEncode = StringUtils.getBytesUtf8(actualResult);
        assertTrue("chunkedEncodeMultipleOf76", Arrays.equals(expectedEncode, actualEncode));
    }

    /**
     * CODEC-68: isBase64 throws ArrayIndexOutOfBoundsException on some
     * non-BASE64 bytes
     */
    @Test
    public void testCodec68() {
        final byte[] x = new byte[] { 'n', 'A', '=', '=', (byte) 0x9c };
        Base64.decodeBase64(x);
    }

    @Test
    public void testCodeInteger1() {
        final String encodedInt1 = "li7dzDacuo67Jg7mtqEm2TRuOMU=";
        final BigInteger bigInt1 = new BigInteger("85739377120809420210425962799" + "0318636601332086981");

        assertEquals(encodedInt1, new String(Base64.encodeInteger(bigInt1)));
        assertEquals(bigInt1, Base64.decodeInteger(encodedInt1.getBytes(CHARSET_UTF8)));
    }

    @Test
    public void testCodeInteger2() {
        final String encodedInt2 = "9B5ypLY9pMOmtxCeTDHgwdNFeGs=";
        final BigInteger bigInt2 = new BigInteger("13936727572861167254666467268" + "91466679477132949611");

        assertEquals(encodedInt2, new String(Base64.encodeInteger(bigInt2)));
        assertEquals(bigInt2, Base64.decodeInteger(encodedInt2.getBytes(CHARSET_UTF8)));
    }

    @Test
    public void testCodeInteger3() {
        final String encodedInt3 = "FKIhdgaG5LGKiEtF1vHy4f3y700zaD6QwDS3IrNVGzNp2" +
            "rY+1LFWTK6D44AyiC1n8uWz1itkYMZF0/aKDK0Yjg==";
        final BigInteger bigInt3 = new BigInteger(
            "10806548154093873461951748545" +
            "1196989136416448805819079363524309897749044958112417136240557" +
            "4495062430572478766856090958495998158114332651671116876320938126");

        assertEquals(encodedInt3, new String(Base64.encodeInteger(bigInt3)));
        assertEquals(bigInt3, Base64.decodeInteger(encodedInt3.getBytes(CHARSET_UTF8)));
    }

    @Test
    public void testCodeInteger4() {
        final String encodedInt4 = "ctA8YGxrtngg/zKVvqEOefnwmViFztcnPBYPlJsvh6yKI" +
            "4iDm68fnp4Mi3RrJ6bZAygFrUIQLxLjV+OJtgJAEto0xAs+Mehuq1DkSFEpP3o" +
            "DzCTOsrOiS1DwQe4oIb7zVk/9l7aPtJMHW0LVlMdwZNFNNJoqMcT2ZfCPrfvYv" +
            "Q0=";
        final BigInteger bigInt4 = new BigInteger("80624726256040348115552042320" +
            "6968135001872753709424419772586693950232350200555646471175944" +
            "519297087885987040810778908507262272892702303774422853675597" +
            "748008534040890923814202286633163248086055216976551456088015" +
            "338880713818192088877057717530169381044092839402438015097654" +
            "53542091716518238707344493641683483917");

        assertEquals(encodedInt4, new String(Base64.encodeInteger(bigInt4)));
        assertEquals(bigInt4, Base64.decodeInteger(encodedInt4.getBytes(CHARSET_UTF8)));
    }

    @Test
    public void testCodeIntegerEdgeCases() {
        // TODO
    }

    @Test
    public void testCodeIntegerNull() {
        try {
            Base64.encodeInteger(null);
            fail("Exception not thrown when passing in null to encodeInteger(BigInteger)");
        } catch (final NullPointerException npe) {
            // expected
        } catch (final Exception e) {
            fail("Incorrect Exception caught when passing in null to encodeInteger(BigInteger)");
        }
    }

    @Test
    public void testConstructors() {
        Base64 base64;
        base64 = new Base64();
        base64 = new Base64(-1);
        base64 = new Base64(-1, new byte[] {});
        base64 = new Base64(64, new byte[] {});
        try {
            base64 = new Base64(-1, new byte[] { 'A' }); // TODO do we need to
                                                            // check sep if len
                                                            // = -1?
            fail("Should have rejected attempt to use 'A' as a line separator");
        } catch (final IllegalArgumentException ignored) {
            // Expected
        }
        try {
            base64 = new Base64(64, new byte[] { 'A' });
            fail("Should have rejected attempt to use 'A' as a line separator");
        } catch (final IllegalArgumentException ignored) {
            // Expected
        }
        try {
            base64 = new Base64(64, new byte[] { '=' });
            fail("Should have rejected attempt to use '=' as a line separator");
        } catch (final IllegalArgumentException ignored) {
            // Expected
        }
        base64 = new Base64(64, new byte[] { '$' }); // OK
        try {
            base64 = new Base64(64, new byte[] { 'A', '$' });
            fail("Should have rejected attempt to use 'A$' as a line separator");
        } catch (final IllegalArgumentException ignored) {
            // Expected
        }
        base64 = new Base64(64, new byte[] { ' ', '$', '\n', '\r', '\t' }); // OK
        assertNotNull(base64);
    }

    @Test
    public void testConstructor_Int_ByteArray_Boolean() {
        final Base64 base64 = new Base64(65, new byte[] { '\t' }, false);
        final byte[] encoded = base64.encode(BaseNTestData.DECODED);
        String expectedResult = Base64TestData.ENCODED_64_CHARS_PER_LINE;
        expectedResult = expectedResult.replace('\n', '\t');
        final String result = StringUtils.newStringUtf8(encoded);
        assertEquals("new Base64(65, \\t, false)", expectedResult, result);
    }

    @Test
    public void testConstructor_Int_ByteArray_Boolean_UrlSafe() {
        // url-safe variation
        final Base64 base64 = new Base64(64, new byte[] { '\t' }, true);
        final byte[] encoded = base64.encode(BaseNTestData.DECODED);
        String expectedResult = Base64TestData.ENCODED_64_CHARS_PER_LINE;
        expectedResult = expectedResult.replaceAll("=", ""); // url-safe has no
                                                                // == padding.
        expectedResult = expectedResult.replace('\n', '\t');
        expectedResult = expectedResult.replace('+', '-');
        expectedResult = expectedResult.replace('/', '_');
        final String result = StringUtils.newStringUtf8(encoded);
        assertEquals("new Base64(64, \\t, true)", result, expectedResult);
    }

    /**
     * Tests conditional true branch for "marker0" test.
     */
    @Test
    public void testDecodePadMarkerIndex2() {
        assertEquals("A", new String(Base64.decodeBase64("QQ==".getBytes(CHARSET_UTF8))));
    }

    /**
     * Tests conditional branches for "marker1" test.
     */
    @Test
    public void testDecodePadMarkerIndex3() {
        assertEquals("AA", new String(Base64.decodeBase64("QUE=".getBytes(CHARSET_UTF8))));
        assertEquals("AAA", new String(Base64.decodeBase64("QUFB".getBytes(CHARSET_UTF8))));
    }

    @Test
    public void testDecodePadOnly() {
        assertEquals(0, Base64.decodeBase64("====".getBytes(CHARSET_UTF8)).length);
        assertEquals("", new String(Base64.decodeBase64("====".getBytes(CHARSET_UTF8))));
        // Test truncated padding
        assertEquals(0, Base64.decodeBase64("===".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("==".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("=".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("".getBytes(CHARSET_UTF8)).length);
    }

    @Test
    public void testDecodePadOnlyChunked() {
        assertEquals(0, Base64.decodeBase64("====\n".getBytes(CHARSET_UTF8)).length);
        assertEquals("", new String(Base64.decodeBase64("====\n".getBytes(CHARSET_UTF8))));
        // Test truncated padding
        assertEquals(0, Base64.decodeBase64("===\n".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("==\n".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("=\n".getBytes(CHARSET_UTF8)).length);
        assertEquals(0, Base64.decodeBase64("\n".getBytes(CHARSET_UTF8)).length);
    }

    @Test
    public void testDecodeWithWhitespace() throws Exception {

        final String orig = "I am a late night coder.";

        final byte[] encodedArray = Base64.encodeBase64(orig.getBytes(CHARSET_UTF8));
        final StringBuilder intermediate = new StringBuilder(new String(encodedArray));

        intermediate.insert(2, ' ');
        intermediate.insert(5, '\t');
        intermediate.insert(10, '\r');
        intermediate.insert(15, '\n');

        final byte[] encodedWithWS = intermediate.toString().getBytes(CHARSET_UTF8);
        final byte[] decodedWithWS = Base64.decodeBase64(encodedWithWS);

        final String dest = new String(decodedWithWS);

        assertEquals("Dest string doesn't equal the original", orig, dest);
    }

    /**
     * Test encode and decode of empty byte array.
     */
    @Test
    public void testEmptyBase64() {
        byte[] empty = new byte[0];
        byte[] result = Base64.encodeBase64(empty);
        assertEquals("empty base64 encode", 0, result.length);
        assertEquals("empty base64 encode", null, Base64.encodeBase64(null));
        result = new Base64().encode(empty, 0, 1);
        assertEquals("empty base64 encode", 0, result.length);
        assertEquals("empty base64 encode", null, new Base64().encode(null, 0, 1));

        empty = new byte[0];
        result = Base64.decodeBase64(empty);
        assertEquals("empty base64 decode", 0, result.length);
        assertEquals("empty base64 encode", null, Base64.decodeBase64((byte[]) null));
    }

    // encode/decode a large random array
    @Test
    public void testEncodeDecodeRandom() {
        for (int i = 1; i < 5; i++) {
            final byte[] data = new byte[this.getRandom().nextInt(10000) + 1];
            this.getRandom().nextBytes(data);
            final byte[] enc = Base64.encodeBase64(data);
            assertTrue(Base64.isBase64(enc));
            final byte[] data2 = Base64.decodeBase64(enc);
            assertTrue(Arrays.equals(data, data2));
        }
    }

    // encode/decode random arrays from size 0 to size 11
    @Test
    public void testEncodeDecodeSmall() {
        for (int i = 0; i < 12; i++) {
            final byte[] data = new byte[i];
            this.getRandom().nextBytes(data);
            final byte[] enc = Base64.encodeBase64(data);
            assertTrue("\"" + new String(enc) + "\" is Base64 data.", Base64.isBase64(enc));
            final byte[] data2 = Base64.decodeBase64(enc);
            assertTrue(toString(data) + " equals " + toString(data2), Arrays.equals(data, data2));
        }
    }

    @Test
    public void testEncodeOverMaxSize() throws Exception {
        testEncodeOverMaxSize(-1);
        testEncodeOverMaxSize(0);
        testEncodeOverMaxSize(1);
        testEncodeOverMaxSize(2);
    }

    @Test
    public void testCodec112() { // size calculation assumes always chunked
        final byte[] in = new byte[] { 0 };
        final byte[] out = Base64.encodeBase64(in);
        Base64.encodeBase64(in, false, false, out.length);
    }

    private void testEncodeOverMaxSize(final int maxSize) throws Exception {
        try {
            Base64.encodeBase64(BaseNTestData.DECODED, true, false, maxSize);
            fail("Expected " + IllegalArgumentException.class.getName());
        } catch (final IllegalArgumentException e) {
            // Expected
        }
    }

    @Test
    public void testIgnoringNonBase64InDecode() throws Exception {
        assertEquals("The quick brown fox jumped over the lazy dogs.",
                new String(Base64.decodeBase64(
                        "VGhlIH@$#$@%F1aWN@#@#@@rIGJyb3duIGZve\n\r\t%#%#%#%CBqd##$#$W1wZWQgb3ZlciB0aGUgbGF6eSBkb2dzLg=="
                                .getBytes(CHARSET_UTF8))));
    }

    @Test
    public void testIsArrayByteBase64() {
        assertFalse(Base64.isBase64(new byte[] { Byte.MIN_VALUE }));
        assertFalse(Base64.isBase64(new byte[] { -125 }));
        assertFalse(Base64.isBase64(new byte[] { -10 }));
        assertFalse(Base64.isBase64(new byte[] { 0 }));
        assertFalse(Base64.isBase64(new byte[] { 64, Byte.MAX_VALUE }));
        assertFalse(Base64.isBase64(new byte[] { Byte.MAX_VALUE }));
        assertTrue(Base64.isBase64(new byte[] { 'A' }));
        assertFalse(Base64.isBase64(new byte[] { 'A', Byte.MIN_VALUE }));
        assertTrue(Base64.isBase64(new byte[] { 'A', 'Z', 'a' }));
        assertTrue(Base64.isBase64(new byte[] { '/', '=', '+' }));
        assertFalse(Base64.isBase64(new byte[] { '$' }));
    }

    /**
     * Tests isUrlSafe.
     */
    @Test
    public void testIsUrlSafe() {
        final Base64 base64Standard = new Base64(false);
        final Base64 base64URLSafe = new Base64(true);

        assertFalse("Base64.isUrlSafe=false", base64Standard.isUrlSafe());
        assertTrue("Base64.isUrlSafe=true", base64URLSafe.isUrlSafe());

        final byte[] whiteSpace = { ' ', '\n', '\r', '\t' };
        assertTrue("Base64.isBase64(whiteSpace)=true", Base64.isBase64(whiteSpace));
    }

    @Test
    public void testKnownDecodings() {
        assertEquals("The quick brown fox jumped over the lazy dogs.", new String(Base64.decodeBase64(
                "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2dzLg==".getBytes(CHARSET_UTF8))));
        assertEquals("It was the best of times, it was the worst of times.", new String(Base64.decodeBase64(
                "SXQgd2FzIHRoZSBiZXN0IG9mIHRpbWVzLCBpdCB3YXMgdGhlIHdvcnN0IG9mIHRpbWVzLg==".getBytes(CHARSET_UTF8))));
        assertEquals("http://jakarta.apache.org/commmons", new String(
                Base64.decodeBase64("aHR0cDovL2pha2FydGEuYXBhY2hlLm9yZy9jb21tbW9ucw==".getBytes(CHARSET_UTF8))));
        assertEquals("AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz", new String(Base64.decodeBase64(
                "QWFCYkNjRGRFZUZmR2dIaElpSmpLa0xsTW1Obk9vUHBRcVJyU3NUdFV1VnZXd1h4WXlaeg==".getBytes(CHARSET_UTF8))));
        assertEquals("{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }",
                new String(Base64.decodeBase64("eyAwLCAxLCAyLCAzLCA0LCA1LCA2LCA3LCA4LCA5IH0=".getBytes(CHARSET_UTF8))));
        assertEquals("xyzzy!", new String(Base64.decodeBase64("eHl6enkh".getBytes(CHARSET_UTF8))));
    }

    @Test
    public void testKnownEncodings() {
        assertEquals("VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2dzLg==", new String(
                Base64.encodeBase64("The quick brown fox jumped over the lazy dogs.".getBytes(CHARSET_UTF8))));
        assertEquals(
                "YmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJs\r\nYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFo\r\nIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBibGFoIGJsYWggYmxhaCBi\r\nbGFoIGJsYWg=\r\n",
                new String(Base64.encodeBase64Chunked(
                        "blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah"
                                .getBytes(CHARSET_UTF8))));
        assertEquals("SXQgd2FzIHRoZSBiZXN0IG9mIHRpbWVzLCBpdCB3YXMgdGhlIHdvcnN0IG9mIHRpbWVzLg==", new String(
                Base64.encodeBase64("It was the best of times, it was the worst of times.".getBytes(CHARSET_UTF8))));
        assertEquals("aHR0cDovL2pha2FydGEuYXBhY2hlLm9yZy9jb21tbW9ucw==",
                new String(Base64.encodeBase64("http://jakarta.apache.org/commmons".getBytes(CHARSET_UTF8))));
        assertEquals("QWFCYkNjRGRFZUZmR2dIaElpSmpLa0xsTW1Obk9vUHBRcVJyU3NUdFV1VnZXd1h4WXlaeg==", new String(
                Base64.encodeBase64("AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz".getBytes(CHARSET_UTF8))));
        assertEquals("eyAwLCAxLCAyLCAzLCA0LCA1LCA2LCA3LCA4LCA5IH0=",
                new String(Base64.encodeBase64("{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }".getBytes(CHARSET_UTF8))));
        assertEquals("eHl6enkh", new String(Base64.encodeBase64("xyzzy!".getBytes(CHARSET_UTF8))));
    }

    @Test
    public void testNonBase64Test() throws Exception {

        final byte[] bArray = { '%' };

        assertFalse("Invalid Base64 array was incorrectly validated as " + "an array of Base64 encoded data",
                Base64.isBase64(bArray));

        try {
            final Base64 b64 = new Base64();
            final byte[] result = b64.decode(bArray);

            assertEquals("The result should be empty as the test encoded content did " +
                "not contain any valid base 64 characters", 0, result.length);
        } catch (final Exception e) {
            fail("Exception was thrown when trying to decode " +
                "invalid base64 encoded data - RFC 2045 requires that all " +
                "non base64 character be discarded, an exception should not" + " have been thrown");
        }
    }

    @Test
    public void testObjectDecodeWithInvalidParameter() throws Exception {
        final Base64 b64 = new Base64();

        try {
            b64.decode(Integer.valueOf(5));
            fail("decode(Object) didn't throw an exception when passed an Integer object");
        } catch (final DecoderException e) {
            // ignored
        }

    }

    @Test
    public void testObjectDecodeWithValidParameter() throws Exception {

        final String original = "Hello World!";
        final Object o = Base64.encodeBase64(original.getBytes(CHARSET_UTF8));

        final Base64 b64 = new Base64();
        final Object oDecoded = b64.decode(o);
        final byte[] baDecoded = (byte[]) oDecoded;
        final String dest = new String(baDecoded);

        assertEquals("dest string does not equal original", original, dest);
    }

    @Test
    public void testObjectEncodeWithInvalidParameter() throws Exception {
        final Base64 b64 = new Base64();
        try {
            b64.encode("Yadayadayada");
            fail("encode(Object) didn't throw an exception when passed a String object");
        } catch (final EncoderException e) {
            // Expected
        }
    }

    @Test
    public void testObjectEncodeWithValidParameter() throws Exception {

        final String original = "Hello World!";
        final Object origObj = original.getBytes(CHARSET_UTF8);

        final Base64 b64 = new Base64();
        final Object oEncoded = b64.encode(origObj);
        final byte[] bArray = Base64.decodeBase64((byte[]) oEncoded);
        final String dest = new String(bArray);

        assertEquals("dest string does not equal original", original, dest);
    }

    @Test
    public void testObjectEncode() throws Exception {
        final Base64 b64 = new Base64();
        assertEquals("SGVsbG8gV29ybGQ=", new String(b64.encode("Hello World".getBytes(CHARSET_UTF8))));
    }

    @Test
    public void testPairs() {
        assertEquals("AAA=", new String(Base64.encodeBase64(new byte[] { 0, 0 })));
        for (int i = -128; i <= 127; i++) {
            final byte test[] = { (byte) i, (byte) i };
            assertTrue(Arrays.equals(test, Base64.decodeBase64(Base64.encodeBase64(test))));
        }
    }

    /**
     * Tests RFC 2045 section 2.1 CRLF definition.
     */
    @Test
    public void testRfc2045Section2Dot1CrLfDefinition() {
        assertTrue(Arrays.equals(new byte[] { 13, 10 }, Base64.CHUNK_SEPARATOR));
    }

    /**
     * Tests RFC 2045 section 6.8 chuck size definition.
     */
    @Test
    public void testRfc2045Section6Dot8ChunkSizeDefinition() {
        assertEquals(76, BaseNCodec.MIME_CHUNK_SIZE);
    }

    /**
     * Tests RFC 1421 section 4.3.2.4 chuck size definition.
     */
    @Test
    public void testRfc1421Section6Dot8ChunkSizeDefinition() {
        assertEquals(64, BaseNCodec.PEM_CHUNK_SIZE);
    }

    /**
     * Tests RFC 4648 section 10 test vectors.
     * <ul>
     * <li>BASE64("") = ""</li>
     * <li>BASE64("f") = "Zg=="</li>
     * <li>BASE64("fo") = "Zm8="</li>
     * <li>BASE64("foo") = "Zm9v"</li>
     * <li>BASE64("foob") = "Zm9vYg=="</li>
     * <li>BASE64("fooba") = "Zm9vYmE="</li>
     * <li>BASE64("foobar") = "Zm9vYmFy"</li>
     * </ul>
     *
     * @see <a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/
     *      html/rfc4648</a>
     */
    @Test
    public void testRfc4648Section10Decode() {
        assertEquals("", StringUtils.newStringUsAscii(Base64.decodeBase64("")));
        assertEquals("f", StringUtils.newStringUsAscii(Base64.decodeBase64("Zg==")));
        assertEquals("fo", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm8=")));
        assertEquals("foo", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9v")));
        assertEquals("foob", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYg==")));
        assertEquals("fooba", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYmE=")));
        assertEquals("foobar", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYmFy")));
    }

    /**
     * Tests RFC 4648 section 10 test vectors.
     * <ul>
     * <li>BASE64("") = ""</li>
     * <li>BASE64("f") = "Zg=="</li>
     * <li>BASE64("fo") = "Zm8="</li>
     * <li>BASE64("foo") = "Zm9v"</li>
     * <li>BASE64("foob") = "Zm9vYg=="</li>
     * <li>BASE64("fooba") = "Zm9vYmE="</li>
     * <li>BASE64("foobar") = "Zm9vYmFy"</li>
     * </ul>
     *
     * @see <a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/
     *      html/rfc4648</a>
     */
    @Test
    public void testRfc4648Section10DecodeWithCrLf() {
        final String CRLF = StringUtils.newStringUsAscii(Base64.CHUNK_SEPARATOR);
        assertEquals("", StringUtils.newStringUsAscii(Base64.decodeBase64("" + CRLF)));
        assertEquals("f", StringUtils.newStringUsAscii(Base64.decodeBase64("Zg==" + CRLF)));
        assertEquals("fo", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm8=" + CRLF)));
        assertEquals("foo", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9v" + CRLF)));
        assertEquals("foob", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYg==" + CRLF)));
        assertEquals("fooba", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYmE=" + CRLF)));
        assertEquals("foobar", StringUtils.newStringUsAscii(Base64.decodeBase64("Zm9vYmFy" + CRLF)));
    }

    /**
     * Tests RFC 4648 section 10 test vectors.
     * <ul>
     * <li>BASE64("") = ""</li>
     * <li>BASE64("f") = "Zg=="</li>
     * <li>BASE64("fo") = "Zm8="</li>
     * <li>BASE64("foo") = "Zm9v"</li>
     * <li>BASE64("foob") = "Zm9vYg=="</li>
     * <li>BASE64("fooba") = "Zm9vYmE="</li>
     * <li>BASE64("foobar") = "Zm9vYmFy"</li>
     * </ul>
     *
     * @see <a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/
     *      html/rfc4648</a>
     */
    @Test
    public void testRfc4648Section10Encode() {
        assertEquals("", Base64.encodeBase64String(StringUtils.getBytesUtf8("")));
        assertEquals("Zg==", Base64.encodeBase64String(StringUtils.getBytesUtf8("f")));
        assertEquals("Zm8=", Base64.encodeBase64String(StringUtils.getBytesUtf8("fo")));
        assertEquals("Zm9v", Base64.encodeBase64String(StringUtils.getBytesUtf8("foo")));
        assertEquals("Zm9vYg==", Base64.encodeBase64String(StringUtils.getBytesUtf8("foob")));
        assertEquals("Zm9vYmE=", Base64.encodeBase64String(StringUtils.getBytesUtf8("fooba")));
        assertEquals("Zm9vYmFy", Base64.encodeBase64String(StringUtils.getBytesUtf8("foobar")));
    }

    /**
     * Tests RFC 4648 section 10 test vectors.
     * <ul>
     * <li>BASE64("") = ""</li>
     * <li>BASE64("f") = "Zg=="</li>
     * <li>BASE64("fo") = "Zm8="</li>
     * <li>BASE64("foo") = "Zm9v"</li>
     * <li>BASE64("foob") = "Zm9vYg=="</li>
     * <li>BASE64("fooba") = "Zm9vYmE="</li>
     * <li>BASE64("foobar") = "Zm9vYmFy"</li>
     * </ul>
     *
     * @see <a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/
     *      html/rfc4648</a>
     */
    @Test
    public void testRfc4648Section10DecodeEncode() {
        testDecodeEncode("");
        testDecodeEncode("Zg==");
        testDecodeEncode("Zm8=");
        testDecodeEncode("Zm9v");
        testDecodeEncode("Zm9vYg==");
        testDecodeEncode("Zm9vYmE=");
        testDecodeEncode("Zm9vYmFy");
    }

    private void testDecodeEncode(final String encodedText) {
        final String decodedText = StringUtils.newStringUsAscii(Base64.decodeBase64(encodedText));
        final String encodedText2 = Base64.encodeBase64String(StringUtils.getBytesUtf8(decodedText));
        assertEquals(encodedText, encodedText2);
    }

    /**
     * Tests RFC 4648 section 10 test vectors.
     * <ul>
     * <li>BASE64("") = ""</li>
     * <li>BASE64("f") = "Zg=="</li>
     * <li>BASE64("fo") = "Zm8="</li>
     * <li>BASE64("foo") = "Zm9v"</li>
     * <li>BASE64("foob") = "Zm9vYg=="</li>
     * <li>BASE64("fooba") = "Zm9vYmE="</li>
     * <li>BASE64("foobar") = "Zm9vYmFy"</li>
     * </ul>
     *
     * @see <a href="http://tools.ietf.org/html/rfc4648">http://tools.ietf.org/
     *      html/rfc4648</a>
     */
    @Test
    public void testRfc4648Section10EncodeDecode() {
        testEncodeDecode("");
        testEncodeDecode("f");
        testEncodeDecode("fo");
        testEncodeDecode("foo");
        testEncodeDecode("foob");
        testEncodeDecode("fooba");
        testEncodeDecode("foobar");
    }

    private void testEncodeDecode(final String plainText) {
        final String encodedText = Base64.encodeBase64String(StringUtils.getBytesUtf8(plainText));
        final String decodedText = StringUtils.newStringUsAscii(Base64.decodeBase64(encodedText));
        assertEquals(plainText, decodedText);
    }

    @Test
    public void testSingletons() {
        assertEquals("AA==", new String(Base64.encodeBase64(new byte[] { (byte) 0 })));
        assertEquals("AQ==", new String(Base64.encodeBase64(new byte[] { (byte) 1 })));
        assertEquals("Ag==", new String(Base64.encodeBase64(new byte[] { (byte) 2 })));
        assertEquals("Aw==", new String(Base64.encodeBase64(new byte[] { (byte) 3 })));
        assertEquals("BA==", new String(Base64.encodeBase64(new byte[] { (byte) 4 })));
        assertEquals("BQ==", new String(Base64.encodeBase64(new byte[] { (byte) 5 })));
        assertEquals("Bg==", new String(Base64.encodeBase64(new byte[] { (byte) 6 })));
        assertEquals("Bw==", new String(Base64.encodeBase64(new byte[] { (byte) 7 })));
        assertEquals("CA==", new String(Base64.encodeBase64(new byte[] { (byte) 8 })));
        assertEquals("CQ==", new String(Base64.encodeBase64(new byte[] { (byte) 9 })));
        assertEquals("Cg==", new String(Base64.encodeBase64(new byte[] { (byte) 10 })));
        assertEquals("Cw==", new String(Base64.encodeBase64(new byte[] { (byte) 11 })));
        assertEquals("DA==", new String(Base64.encodeBase64(new byte[] { (byte) 12 })));
        assertEquals("DQ==", new String(Base64.encodeBase64(new byte[] { (byte) 13 })));
        assertEquals("Dg==", new String(Base64.encodeBase64(new byte[] { (byte) 14 })));
        assertEquals("Dw==", new String(Base64.encodeBase64(new byte[] { (byte) 15 })));
        assertEquals("EA==", new String(Base64.encodeBase64(new byte[] { (byte) 16 })));
        assertEquals("EQ==", new String(Base64.encodeBase64(new byte[] { (byte) 17 })));
        assertEquals("Eg==", new String(Base64.encodeBase64(new byte[] { (byte) 18 })));
        assertEquals("Ew==", new String(Base64.encodeBase64(new byte[] { (byte) 19 })));
        assertEquals("FA==", new String(Base64.encodeBase64(new byte[] { (byte) 20 })));
        assertEquals("FQ==", new String(Base64.encodeBase64(new byte[] { (byte) 21 })));
        assertEquals("Fg==", new String(Base64.encodeBase64(new byte[] { (byte) 22 })));
        assertEquals("Fw==", new String(Base64.encodeBase64(new byte[] { (byte) 23 })));
        assertEquals("GA==", new String(Base64.encodeBase64(new byte[] { (byte) 24 })));
        assertEquals("GQ==", new String(Base64.encodeBase64(new byte[] { (byte) 25 })));
        assertEquals("Gg==", new String(Base64.encodeBase64(new byte[] { (byte) 26 })));
        assertEquals("Gw==", new String(Base64.encodeBase64(new byte[] { (byte) 27 })));
        assertEquals("HA==", new String(Base64.encodeBase64(new byte[] { (byte) 28 })));
        assertEquals("HQ==", new String(Base64.encodeBase64(new byte[] { (byte) 29 })));
        assertEquals("Hg==", new String(Base64.encodeBase64(new byte[] { (byte) 30 })));
        assertEquals("Hw==", new String(Base64.encodeBase64(new byte[] { (byte) 31 })));
        assertEquals("IA==", new String(Base64.encodeBase64(new byte[] { (byte) 32 })));
        assertEquals("IQ==", new String(Base64.encodeBase64(new byte[] { (byte) 33 })));
        assertEquals("Ig==", new String(Base64.encodeBase64(new byte[] { (byte) 34 })));
        assertEquals("Iw==", new String(Base64.encodeBase64(new byte[] { (byte) 35 })));
        assertEquals("JA==", new String(Base64.encodeBase64(new byte[] { (byte) 36 })));
        assertEquals("JQ==", new String(Base64.encodeBase64(new byte[] { (byte) 37 })));
        assertEquals("Jg==", new String(Base64.encodeBase64(new byte[] { (byte) 38 })));
        assertEquals("Jw==", new String(Base64.encodeBase64(new byte[] { (byte) 39 })));
        assertEquals("KA==", new String(Base64.encodeBase64(new byte[] { (byte) 40 })));
        assertEquals("KQ==", new String(Base64.encodeBase64(new byte[] { (byte) 41 })));
        assertEquals("Kg==", new String(Base64.encodeBase64(new byte[] { (byte) 42 })));
        assertEquals("Kw==", new String(Base64.encodeBase64(new byte[] { (byte) 43 })));
        assertEquals("LA==", new String(Base64.encodeBase64(new byte[] { (byte) 44 })));
        assertEquals("LQ==", new String(Base64.encodeBase64(new byte[] { (byte) 45 })));
        assertEquals("Lg==", new String(Base64.encodeBase64(new byte[] { (byte) 46 })));
        assertEquals("Lw==", new String(Base64.encodeBase64(new byte[] { (byte) 47 })));
        assertEquals("MA==", new String(Base64.encodeBase64(new byte[] { (byte) 48 })));
        assertEquals("MQ==", new String(Base64.encodeBase64(new byte[] { (byte) 49 })));
        assertEquals("Mg==", new String(Base64.encodeBase64(new byte[] { (byte) 50 })));
        assertEquals("Mw==", new String(Base64.encodeBase64(new byte[] { (byte) 51 })));
        assertEquals("NA==", new String(Base64.encodeBase64(new byte[] { (byte) 52 })));
        assertEquals("NQ==", new String(Base64.encodeBase64(new byte[] { (byte) 53 })));
        assertEquals("Ng==", new String(Base64.encodeBase64(new byte[] { (byte) 54 })));
        assertEquals("Nw==", new String(Base64.encodeBase64(new byte[] { (byte) 55 })));
        assertEquals("OA==", new String(Base64.encodeBase64(new byte[] { (byte) 56 })));
        assertEquals("OQ==", new String(Base64.encodeBase64(new byte[] { (byte) 57 })));
        assertEquals("Og==", new String(Base64.encodeBase64(new byte[] { (byte) 58 })));
        assertEquals("Ow==", new String(Base64.encodeBase64(new byte[] { (byte) 59 })));
        assertEquals("PA==", new String(Base64.encodeBase64(new byte[] { (byte) 60 })));
        assertEquals("PQ==", new String(Base64.encodeBase64(new byte[] { (byte) 61 })));
        assertEquals("Pg==", new String(Base64.encodeBase64(new byte[] { (byte) 62 })));
        assertEquals("Pw==", new String(Base64.encodeBase64(new byte[] { (byte) 63 })));
        assertEquals("QA==", new String(Base64.encodeBase64(new byte[] { (byte) 64 })));
        assertEquals("QQ==", new String(Base64.encodeBase64(new byte[] { (byte) 65 })));
        assertEquals("Qg==", new String(Base64.encodeBase64(new byte[] { (byte) 66 })));
        assertEquals("Qw==", new String(Base64.encodeBase64(new byte[] { (byte) 67 })));
        assertEquals("RA==", new String(Base64.encodeBase64(new byte[] { (byte) 68 })));
        assertEquals("RQ==", new String(Base64.encodeBase64(new byte[] { (byte) 69 })));
        assertEquals("Rg==", new String(Base64.encodeBase64(new byte[] { (byte) 70 })));
        assertEquals("Rw==", new String(Base64.encodeBase64(new byte[] { (byte) 71 })));
        assertEquals("SA==", new String(Base64.encodeBase64(new byte[] { (byte) 72 })));
        assertEquals("SQ==", new String(Base64.encodeBase64(new byte[] { (byte) 73 })));
        assertEquals("Sg==", new String(Base64.encodeBase64(new byte[] { (byte) 74 })));
        assertEquals("Sw==", new String(Base64.encodeBase64(new byte[] { (byte) 75 })));
        assertEquals("TA==", new String(Base64.encodeBase64(new byte[] { (byte) 76 })));
        assertEquals("TQ==", new String(Base64.encodeBase64(new byte[] { (byte) 77 })));
        assertEquals("Tg==", new String(Base64.encodeBase64(new byte[] { (byte) 78 })));
        assertEquals("Tw==", new String(Base64.encodeBase64(new byte[] { (byte) 79 })));
        assertEquals("UA==", new String(Base64.encodeBase64(new byte[] { (byte) 80 })));
        assertEquals("UQ==", new String(Base64.encodeBase64(new byte[] { (byte) 81 })));
        assertEquals("Ug==", new String(Base64.encodeBase64(new byte[] { (byte) 82 })));
        assertEquals("Uw==", new String(Base64.encodeBase64(new byte[] { (byte) 83 })));
        assertEquals("VA==", new String(Base64.encodeBase64(new byte[] { (byte) 84 })));
        assertEquals("VQ==", new String(Base64.encodeBase64(new byte[] { (byte) 85 })));
        assertEquals("Vg==", new String(Base64.encodeBase64(new byte[] { (byte) 86 })));
        assertEquals("Vw==", new String(Base64.encodeBase64(new byte[] { (byte) 87 })));
        assertEquals("WA==", new String(Base64.encodeBase64(new byte[] { (byte) 88 })));
        assertEquals("WQ==", new String(Base64.encodeBase64(new byte[] { (byte) 89 })));
        assertEquals("Wg==", new String(Base64.encodeBase64(new byte[] { (byte) 90 })));
        assertEquals("Ww==", new String(Base64.encodeBase64(new byte[] { (byte) 91 })));
        assertEquals("XA==", new String(Base64.encodeBase64(new byte[] { (byte) 92 })));
        assertEquals("XQ==", new String(Base64.encodeBase64(new byte[] { (byte) 93 })));
        assertEquals("Xg==", new String(Base64.encodeBase64(new byte[] { (byte) 94 })));
        assertEquals("Xw==", new String(Base64.encodeBase64(new byte[] { (byte) 95 })));
        assertEquals("YA==", new String(Base64.encodeBase64(new byte[] { (byte) 96 })));
        assertEquals("YQ==", new String(Base64.encodeBase64(new byte[] { (byte) 97 })));
        assertEquals("Yg==", new String(Base64.encodeBase64(new byte[] { (byte) 98 })));
        assertEquals("Yw==", new String(Base64.encodeBase64(new byte[] { (byte) 99 })));
        assertEquals("ZA==", new String(Base64.encodeBase64(new byte[] { (byte) 100 })));
        assertEquals("ZQ==", new String(Base64.encodeBase64(new byte[] { (byte) 101 })));
        assertEquals("Zg==", new String(Base64.encodeBase64(new byte[] { (byte) 102 })));
        assertEquals("Zw==", new String(Base64.encodeBase64(new byte[] { (byte) 103 })));
        assertEquals("aA==", new String(Base64.encodeBase64(new byte[] { (byte) 104 })));
        for (int i = -128; i <= 127; i++) {
            final byte test[] = { (byte) i };
            assertTrue(Arrays.equals(test, Base64.decodeBase64(Base64.encodeBase64(test))));
        }
    }

    @Test
    public void testSingletonsChunked() {
        assertEquals("AA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0 })));
        assertEquals("AQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 1 })));
        assertEquals("Ag==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 2 })));
        assertEquals("Aw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 3 })));
        assertEquals("BA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 4 })));
        assertEquals("BQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 5 })));
        assertEquals("Bg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 6 })));
        assertEquals("Bw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 7 })));
        assertEquals("CA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 8 })));
        assertEquals("CQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 9 })));
        assertEquals("Cg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 10 })));
        assertEquals("Cw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 11 })));
        assertEquals("DA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 12 })));
        assertEquals("DQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 13 })));
        assertEquals("Dg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 14 })));
        assertEquals("Dw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 15 })));
        assertEquals("EA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 16 })));
        assertEquals("EQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 17 })));
        assertEquals("Eg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 18 })));
        assertEquals("Ew==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 19 })));
        assertEquals("FA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 20 })));
        assertEquals("FQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 21 })));
        assertEquals("Fg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 22 })));
        assertEquals("Fw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 23 })));
        assertEquals("GA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 24 })));
        assertEquals("GQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 25 })));
        assertEquals("Gg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 26 })));
        assertEquals("Gw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 27 })));
        assertEquals("HA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 28 })));
        assertEquals("HQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 29 })));
        assertEquals("Hg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 30 })));
        assertEquals("Hw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 31 })));
        assertEquals("IA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 32 })));
        assertEquals("IQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 33 })));
        assertEquals("Ig==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 34 })));
        assertEquals("Iw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 35 })));
        assertEquals("JA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 36 })));
        assertEquals("JQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 37 })));
        assertEquals("Jg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 38 })));
        assertEquals("Jw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 39 })));
        assertEquals("KA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 40 })));
        assertEquals("KQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 41 })));
        assertEquals("Kg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 42 })));
        assertEquals("Kw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 43 })));
        assertEquals("LA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 44 })));
        assertEquals("LQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 45 })));
        assertEquals("Lg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 46 })));
        assertEquals("Lw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 47 })));
        assertEquals("MA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 48 })));
        assertEquals("MQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 49 })));
        assertEquals("Mg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 50 })));
        assertEquals("Mw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 51 })));
        assertEquals("NA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 52 })));
        assertEquals("NQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 53 })));
        assertEquals("Ng==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 54 })));
        assertEquals("Nw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 55 })));
        assertEquals("OA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 56 })));
        assertEquals("OQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 57 })));
        assertEquals("Og==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 58 })));
        assertEquals("Ow==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 59 })));
        assertEquals("PA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 60 })));
        assertEquals("PQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 61 })));
        assertEquals("Pg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 62 })));
        assertEquals("Pw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 63 })));
        assertEquals("QA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 64 })));
        assertEquals("QQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 65 })));
        assertEquals("Qg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 66 })));
        assertEquals("Qw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 67 })));
        assertEquals("RA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 68 })));
        assertEquals("RQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 69 })));
        assertEquals("Rg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 70 })));
        assertEquals("Rw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 71 })));
        assertEquals("SA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 72 })));
        assertEquals("SQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 73 })));
        assertEquals("Sg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 74 })));
        assertEquals("Sw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 75 })));
        assertEquals("TA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 76 })));
        assertEquals("TQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 77 })));
        assertEquals("Tg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 78 })));
        assertEquals("Tw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 79 })));
        assertEquals("UA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 80 })));
        assertEquals("UQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 81 })));
        assertEquals("Ug==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 82 })));
        assertEquals("Uw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 83 })));
        assertEquals("VA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 84 })));
        assertEquals("VQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 85 })));
        assertEquals("Vg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 86 })));
        assertEquals("Vw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 87 })));
        assertEquals("WA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 88 })));
        assertEquals("WQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 89 })));
        assertEquals("Wg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 90 })));
        assertEquals("Ww==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 91 })));
        assertEquals("XA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 92 })));
        assertEquals("XQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 93 })));
        assertEquals("Xg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 94 })));
        assertEquals("Xw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 95 })));
        assertEquals("YA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 96 })));
        assertEquals("YQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 97 })));
        assertEquals("Yg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 98 })));
        assertEquals("Yw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 99 })));
        assertEquals("ZA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 100 })));
        assertEquals("ZQ==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 101 })));
        assertEquals("Zg==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 102 })));
        assertEquals("Zw==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 103 })));
        assertEquals("aA==\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 104 })));
    }

    @Test
    public void testTriplets() {
        assertEquals("AAAA", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 0 })));
        assertEquals("AAAB", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 1 })));
        assertEquals("AAAC", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 2 })));
        assertEquals("AAAD", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 3 })));
        assertEquals("AAAE", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 4 })));
        assertEquals("AAAF", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 5 })));
        assertEquals("AAAG", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 6 })));
        assertEquals("AAAH", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 7 })));
        assertEquals("AAAI", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 8 })));
        assertEquals("AAAJ", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 9 })));
        assertEquals("AAAK", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 10 })));
        assertEquals("AAAL", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 11 })));
        assertEquals("AAAM", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 12 })));
        assertEquals("AAAN", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 13 })));
        assertEquals("AAAO", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 14 })));
        assertEquals("AAAP", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 15 })));
        assertEquals("AAAQ", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 16 })));
        assertEquals("AAAR", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 17 })));
        assertEquals("AAAS", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 18 })));
        assertEquals("AAAT", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 19 })));
        assertEquals("AAAU", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 20 })));
        assertEquals("AAAV", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 21 })));
        assertEquals("AAAW", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 22 })));
        assertEquals("AAAX", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 23 })));
        assertEquals("AAAY", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 24 })));
        assertEquals("AAAZ", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 25 })));
        assertEquals("AAAa", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 26 })));
        assertEquals("AAAb", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 27 })));
        assertEquals("AAAc", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 28 })));
        assertEquals("AAAd", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 29 })));
        assertEquals("AAAe", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 30 })));
        assertEquals("AAAf", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 31 })));
        assertEquals("AAAg", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 32 })));
        assertEquals("AAAh", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 33 })));
        assertEquals("AAAi", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 34 })));
        assertEquals("AAAj", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 35 })));
        assertEquals("AAAk", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 36 })));
        assertEquals("AAAl", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 37 })));
        assertEquals("AAAm", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 38 })));
        assertEquals("AAAn", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 39 })));
        assertEquals("AAAo", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 40 })));
        assertEquals("AAAp", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 41 })));
        assertEquals("AAAq", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 42 })));
        assertEquals("AAAr", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 43 })));
        assertEquals("AAAs", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 44 })));
        assertEquals("AAAt", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 45 })));
        assertEquals("AAAu", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 46 })));
        assertEquals("AAAv", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 47 })));
        assertEquals("AAAw", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 48 })));
        assertEquals("AAAx", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 49 })));
        assertEquals("AAAy", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 50 })));
        assertEquals("AAAz", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 51 })));
        assertEquals("AAA0", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 52 })));
        assertEquals("AAA1", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 53 })));
        assertEquals("AAA2", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 54 })));
        assertEquals("AAA3", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 55 })));
        assertEquals("AAA4", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 56 })));
        assertEquals("AAA5", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 57 })));
        assertEquals("AAA6", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 58 })));
        assertEquals("AAA7", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 59 })));
        assertEquals("AAA8", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 60 })));
        assertEquals("AAA9", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 61 })));
        assertEquals("AAA+", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 62 })));
        assertEquals("AAA/", new String(Base64.encodeBase64(new byte[] { (byte) 0, (byte) 0, (byte) 63 })));
    }

    @Test
    public void testTripletsChunked() {
        assertEquals("AAAA\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 0 })));
        assertEquals("AAAB\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 1 })));
        assertEquals("AAAC\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 2 })));
        assertEquals("AAAD\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 3 })));
        assertEquals("AAAE\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 4 })));
        assertEquals("AAAF\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 5 })));
        assertEquals("AAAG\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 6 })));
        assertEquals("AAAH\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 7 })));
        assertEquals("AAAI\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 8 })));
        assertEquals("AAAJ\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 9 })));
        assertEquals("AAAK\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 10 })));
        assertEquals("AAAL\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 11 })));
        assertEquals("AAAM\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 12 })));
        assertEquals("AAAN\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 13 })));
        assertEquals("AAAO\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 14 })));
        assertEquals("AAAP\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 15 })));
        assertEquals("AAAQ\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 16 })));
        assertEquals("AAAR\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 17 })));
        assertEquals("AAAS\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 18 })));
        assertEquals("AAAT\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 19 })));
        assertEquals("AAAU\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 20 })));
        assertEquals("AAAV\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 21 })));
        assertEquals("AAAW\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 22 })));
        assertEquals("AAAX\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 23 })));
        assertEquals("AAAY\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 24 })));
        assertEquals("AAAZ\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 25 })));
        assertEquals("AAAa\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 26 })));
        assertEquals("AAAb\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 27 })));
        assertEquals("AAAc\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 28 })));
        assertEquals("AAAd\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 29 })));
        assertEquals("AAAe\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 30 })));
        assertEquals("AAAf\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 31 })));
        assertEquals("AAAg\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 32 })));
        assertEquals("AAAh\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 33 })));
        assertEquals("AAAi\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 34 })));
        assertEquals("AAAj\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 35 })));
        assertEquals("AAAk\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 36 })));
        assertEquals("AAAl\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 37 })));
        assertEquals("AAAm\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 38 })));
        assertEquals("AAAn\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 39 })));
        assertEquals("AAAo\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 40 })));
        assertEquals("AAAp\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 41 })));
        assertEquals("AAAq\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 42 })));
        assertEquals("AAAr\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 43 })));
        assertEquals("AAAs\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 44 })));
        assertEquals("AAAt\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 45 })));
        assertEquals("AAAu\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 46 })));
        assertEquals("AAAv\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 47 })));
        assertEquals("AAAw\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 48 })));
        assertEquals("AAAx\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 49 })));
        assertEquals("AAAy\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 50 })));
        assertEquals("AAAz\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 51 })));
        assertEquals("AAA0\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 52 })));
        assertEquals("AAA1\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 53 })));
        assertEquals("AAA2\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 54 })));
        assertEquals("AAA3\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 55 })));
        assertEquals("AAA4\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 56 })));
        assertEquals("AAA5\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 57 })));
        assertEquals("AAA6\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 58 })));
        assertEquals("AAA7\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 59 })));
        assertEquals("AAA8\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 60 })));
        assertEquals("AAA9\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 61 })));
        assertEquals("AAA+\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 62 })));
        assertEquals("AAA/\r\n", new String(Base64.encodeBase64Chunked(new byte[] { (byte) 0, (byte) 0, (byte) 63 })));
    }

    /**
     * Tests url-safe Base64 against random data, sizes 0 to 150.
     */
    @Test
    public void testUrlSafe() {
        // test random data of sizes 0 thru 150
        final BaseNCodec codec = new Base64(true);
        for (int i = 0; i <= 150; i++) {
            final byte[][] randomData = BaseNTestData.randomData(codec, i);
            final byte[] encoded = randomData[1];
            final byte[] decoded = randomData[0];
            final byte[] result = Base64.decodeBase64(encoded);
            assertTrue("url-safe i=" + i, Arrays.equals(decoded, result));
            assertFalse("url-safe i=" + i + " no '='", BaseNTestData.bytesContain(encoded, (byte) '='));
            assertFalse("url-safe i=" + i + " no '\\'", BaseNTestData.bytesContain(encoded, (byte) '\\'));
            assertFalse("url-safe i=" + i + " no '+'", BaseNTestData.bytesContain(encoded, (byte) '+'));
        }

    }

    /**
     * Base64 encoding of UUID's is a common use-case, especially in URL-SAFE
     * mode. This test case ends up being the "URL-SAFE" JUnit's.
     *
     * @throws DecoderException
     *             if Hex.decode() fails - a serious problem since Hex comes
     *             from our own commons-codec!
     */
    @Test
    public void testUUID() throws DecoderException {
        // The 4 UUID's below contains mixtures of + and / to help us test the
        // URL-SAFE encoding mode.
        final byte[][] ids = new byte[4][];

        // ids[0] was chosen so that it encodes with at least one +.
        ids[0] = Hex.decodeHex("94ed8d0319e4493399560fb67404d370");

        // ids[1] was chosen so that it encodes with both / and +.
        ids[1] = Hex.decodeHex("2bf7cc2701fe4397b49ebeed5acc7090");

        // ids[2] was chosen so that it encodes with at least one /.
        ids[2] = Hex.decodeHex("64be154b6ffa40258d1a01288e7c31ca");

        // ids[3] was chosen so that it encodes with both / and +, with /
        // right at the beginning.
        ids[3] = Hex.decodeHex("ff7f8fc01cdb471a8c8b5a9306183fe8");

        final byte[][] standard = new byte[4][];
        standard[0] = StringUtils.getBytesUtf8("lO2NAxnkSTOZVg+2dATTcA==");
        standard[1] = StringUtils.getBytesUtf8("K/fMJwH+Q5e0nr7tWsxwkA==");
        standard[2] = StringUtils.getBytesUtf8("ZL4VS2/6QCWNGgEojnwxyg==");
        standard[3] = StringUtils.getBytesUtf8("/3+PwBzbRxqMi1qTBhg/6A==");

        final byte[][] urlSafe1 = new byte[4][];
        // regular padding (two '==' signs).
        urlSafe1[0] = StringUtils.getBytesUtf8("lO2NAxnkSTOZVg-2dATTcA==");
        urlSafe1[1] = StringUtils.getBytesUtf8("K_fMJwH-Q5e0nr7tWsxwkA==");
        urlSafe1[2] = StringUtils.getBytesUtf8("ZL4VS2_6QCWNGgEojnwxyg==");
        urlSafe1[3] = StringUtils.getBytesUtf8("_3-PwBzbRxqMi1qTBhg_6A==");

        final byte[][] urlSafe2 = new byte[4][];
        // single padding (only one '=' sign).
        urlSafe2[0] = StringUtils.getBytesUtf8("lO2NAxnkSTOZVg-2dATTcA=");
        urlSafe2[1] = StringUtils.getBytesUtf8("K_fMJwH-Q5e0nr7tWsxwkA=");
        urlSafe2[2] = StringUtils.getBytesUtf8("ZL4VS2_6QCWNGgEojnwxyg=");
        urlSafe2[3] = StringUtils.getBytesUtf8("_3-PwBzbRxqMi1qTBhg_6A=");

        final byte[][] urlSafe3 = new byte[4][];
        // no padding (no '=' signs).
        urlSafe3[0] = StringUtils.getBytesUtf8("lO2NAxnkSTOZVg-2dATTcA");
        urlSafe3[1] = StringUtils.getBytesUtf8("K_fMJwH-Q5e0nr7tWsxwkA");
        urlSafe3[2] = StringUtils.getBytesUtf8("ZL4VS2_6QCWNGgEojnwxyg");
        urlSafe3[3] = StringUtils.getBytesUtf8("_3-PwBzbRxqMi1qTBhg_6A");

        for (int i = 0; i < 4; i++) {
            final byte[] encodedStandard = Base64.encodeBase64(ids[i]);
            final byte[] encodedUrlSafe = Base64.encodeBase64URLSafe(ids[i]);
            final byte[] decodedStandard = Base64.decodeBase64(standard[i]);
            final byte[] decodedUrlSafe1 = Base64.decodeBase64(urlSafe1[i]);
            final byte[] decodedUrlSafe2 = Base64.decodeBase64(urlSafe2[i]);
            final byte[] decodedUrlSafe3 = Base64.decodeBase64(urlSafe3[i]);

            // Very important debugging output should anyone
            // ever need to delve closely into this stuff.
//            {
//                System.out.println("reference: [" + Hex.encodeHexString(ids[i]) + "]");
//                System.out.println("standard:  [" + Hex.encodeHexString(decodedStandard) + "] From: ["
//                        + StringUtils.newStringUtf8(standard[i]) + "]");
//                System.out.println("safe1:     [" + Hex.encodeHexString(decodedUrlSafe1) + "] From: ["
//                        + StringUtils.newStringUtf8(urlSafe1[i]) + "]");
//                System.out.println("safe2:     [" + Hex.encodeHexString(decodedUrlSafe2) + "] From: ["
//                        + StringUtils.newStringUtf8(urlSafe2[i]) + "]");
//                System.out.println("safe3:     [" + Hex.encodeHexString(decodedUrlSafe3) + "] From: ["
//                        + StringUtils.newStringUtf8(urlSafe3[i]) + "]");
//            }

            assertTrue("standard encode uuid", Arrays.equals(encodedStandard, standard[i]));
            assertTrue("url-safe encode uuid", Arrays.equals(encodedUrlSafe, urlSafe3[i]));
            assertTrue("standard decode uuid", Arrays.equals(decodedStandard, ids[i]));
            assertTrue("url-safe1 decode uuid", Arrays.equals(decodedUrlSafe1, ids[i]));
            assertTrue("url-safe2 decode uuid", Arrays.equals(decodedUrlSafe2, ids[i]));
            assertTrue("url-safe3 decode uuid", Arrays.equals(decodedUrlSafe3, ids[i]));
        }
    }

    @Test
    public void testByteToStringVariations() throws DecoderException {
        final Base64 base64 = new Base64(0);
        final byte[] b1 = StringUtils.getBytesUtf8("Hello World");
        final byte[] b2 = new byte[0];
        final byte[] b3 = null;
        final byte[] b4 = Hex.decodeHex("2bf7cc2701fe4397b49ebeed5acc7090"); // for
                                                                                            // url-safe
                                                                                            // tests

        assertEquals("byteToString Hello World", "SGVsbG8gV29ybGQ=", base64.encodeToString(b1));
        assertEquals("byteToString static Hello World", "SGVsbG8gV29ybGQ=", Base64.encodeBase64String(b1));
        assertEquals("byteToString \"\"", "", base64.encodeToString(b2));
        assertEquals("byteToString static \"\"", "", Base64.encodeBase64String(b2));
        assertEquals("byteToString null", null, base64.encodeToString(b3));
        assertEquals("byteToString static null", null, Base64.encodeBase64String(b3));
        assertEquals("byteToString UUID", "K/fMJwH+Q5e0nr7tWsxwkA==", base64.encodeToString(b4));
        assertEquals("byteToString static UUID", "K/fMJwH+Q5e0nr7tWsxwkA==", Base64.encodeBase64String(b4));
        assertEquals("byteToString static-url-safe UUID", "K_fMJwH-Q5e0nr7tWsxwkA",
                Base64.encodeBase64URLSafeString(b4));
    }

    @Test
    public void testStringToByteVariations() throws DecoderException {
        final Base64 base64 = new Base64();
        final String s1 = "SGVsbG8gV29ybGQ=\r\n";
        final String s2 = "";
        final String s3 = null;
        final String s4a = "K/fMJwH+Q5e0nr7tWsxwkA==\r\n";
        final String s4b = "K_fMJwH-Q5e0nr7tWsxwkA";
        final byte[] b4 = Hex.decodeHex("2bf7cc2701fe4397b49ebeed5acc7090"); // for
                                                                                            // url-safe
                                                                                            // tests

        assertEquals("StringToByte Hello World", "Hello World", StringUtils.newStringUtf8(base64.decode(s1)));
        assertEquals("StringToByte Hello World", "Hello World",
                StringUtils.newStringUtf8((byte[]) base64.decode((Object) s1)));
        assertEquals("StringToByte static Hello World", "Hello World",
                StringUtils.newStringUtf8(Base64.decodeBase64(s1)));
        assertEquals("StringToByte \"\"", "", StringUtils.newStringUtf8(base64.decode(s2)));
        assertEquals("StringToByte static \"\"", "", StringUtils.newStringUtf8(Base64.decodeBase64(s2)));
        assertEquals("StringToByte null", null, StringUtils.newStringUtf8(base64.decode(s3)));
        assertEquals("StringToByte static null", null, StringUtils.newStringUtf8(Base64.decodeBase64(s3)));
        assertTrue("StringToByte UUID", Arrays.equals(b4, base64.decode(s4b)));
        assertTrue("StringToByte static UUID", Arrays.equals(b4, Base64.decodeBase64(s4a)));
        assertTrue("StringToByte static-url-safe UUID", Arrays.equals(b4, Base64.decodeBase64(s4b)));
    }

    private String toString(final byte[] data) {
        final StringBuilder buf = new StringBuilder();
        for (int i = 0; i < data.length; i++) {
            buf.append(data[i]);
            if (i != data.length - 1) {
                buf.append(",");
            }
        }
        return buf.toString();
    }

    /**
     * Tests a lineSeparator much bigger than DEFAULT_BUFFER_SIZE.
     *
     * @see "<a href='https://mail-archives.apache.org/mod_mbox/commons-dev/201202.mbox/%3C4F3C85D7.5060706@snafu.de%3E'>dev@commons.apache.org</a>"
     */
    @Test
    public void testHugeLineSeparator() {
        final int BaseNCodec_DEFAULT_BUFFER_SIZE = 8192;
        final int Base64_BYTES_PER_ENCODED_BLOCK = 4;
        final byte[] baLineSeparator = new byte[BaseNCodec_DEFAULT_BUFFER_SIZE * 4 - 3];
        final Base64 b64 = new Base64(Base64_BYTES_PER_ENCODED_BLOCK, baLineSeparator);
        final String strOriginal = "Hello World";
        final String strDecoded = new String(b64.decode(b64.encode(StringUtils.getBytesUtf8(strOriginal))));
        assertEquals("testDEFAULT_BUFFER_SIZE", strOriginal, strDecoded);
    }

    @Test
    public void testBase64ImpossibleSamples() {
        final Base64 codec = new Base64(0, null, false, CodecPolicy.STRICT);
        for (final String s : BASE64_IMPOSSIBLE_CASES) {
            try {
                codec.decode(s);
                fail();
            } catch (final IllegalArgumentException ex) {
                // expected
            }
        }
    }

    @Test
    public void testBase64DecodingOfTrailing6Bits() {
        assertBase64DecodingOfTrailingBits(6);
    }

    @Test
    public void testBase64DecodingOfTrailing12Bits() {
        assertBase64DecodingOfTrailingBits(12);
    }

    @Test
    public void testBase64DecodingOfTrailing18Bits() {
        assertBase64DecodingOfTrailingBits(18);
    }

    /**
     * Test base 64 decoding of the final trailing bits. Trailing encoded bytes
     * cannot fit exactly into 6-bit characters so the last character has a limited
     * alphabet where the final bits are zero. This asserts that illegal final
     * characters throw an exception when decoding.
     *
     * @param nbits the number of trailing bits (must be a factor of 6 and {@code <24})
     */
    private static void assertBase64DecodingOfTrailingBits(final int nbits) {
        final Base64 codec = new Base64(0, null, false, CodecPolicy.STRICT);
        // Requires strict decoding
        assertTrue(codec.isStrictDecoding());
        assertEquals(CodecPolicy.STRICT, codec.getCodecPolicy());
        // A lenient decoder should not re-encode to the same bytes
        final Base64 defaultCodec = new Base64();
        assertFalse(defaultCodec.isStrictDecoding());
        assertEquals(CodecPolicy.LENIENT, defaultCodec.getCodecPolicy());

        // Create the encoded bytes. The first characters must be valid so fill with 'zero'
        // then pad to the block size.
        final int length = nbits / 6;
        final byte[] encoded = new byte[4];
        Arrays.fill(encoded, 0, length, STANDARD_ENCODE_TABLE[0]);
        Arrays.fill(encoded, length, encoded.length, (byte) '=');
        // Compute how many bits would be discarded from 8-bit bytes
        final int discard = nbits % 8;
        final int emptyBitsMask = (1 << discard) - 1;
        // Special case when an impossible number of trailing characters
        final boolean invalid = length == 1;
        // Enumerate all 64 possible final characters in the last position
        final int last = length - 1;
        for (int i = 0; i < 64; i++) {
            encoded[last] = STANDARD_ENCODE_TABLE[i];
            // If the lower bits are set we expect an exception. This is not a valid
            // final character.
            if (invalid || (i & emptyBitsMask) != 0) {
                try {
                    codec.decode(encoded);
                    fail("Final base-64 digit should not be allowed");
                } catch (final IllegalArgumentException ex) {
                    // expected
                }
                // The default lenient mode should decode this
                final byte[] decoded = defaultCodec.decode(encoded);
                // Re-encoding should not match the original array as it was invalid
                assertFalse(Arrays.equals(encoded, defaultCodec.encode(decoded)));
            } else {
                // Otherwise this should decode
                final byte[] decoded = codec.decode(encoded);
                // Compute the bits that were encoded. This should match the final decoded byte.
                final int bitsEncoded = i >> discard;
                assertEquals("Invalid decoding of last character", bitsEncoded, decoded[decoded.length - 1]);
                // Re-encoding should match the original array (requires the same padding character)
                assertArrayEquals(encoded, codec.encode(decoded));
            }
        }
    }

    /**
     * Test for CODEC-265: Encode a 1GiB file.
     *
     * @see <a href="https://issues.apache.org/jira/projects/CODEC/issues/CODEC-265">CODEC-265</a>
     */
    @Test
    public void testCodec265() {
        // 1GiB file to encode: 2^30 bytes
        final int size1GiB = 1 << 30;

        // Expecting a size of 4 output bytes per 3 input bytes plus the trailing bytes
        // padded to a block size of 4.
        final int blocks = (int) Math.ceil(size1GiB / 3.0);
        final int expectedLength = 4 * blocks;

        // This test is memory hungry. Check we can run it.
        final long presumableFreeMemory = BaseNCodecTest.getPresumableFreeMemory();

        // Estimate the maximum memory required:
        // 1GiB + 1GiB + ~2GiB + ~1.33GiB + 32 KiB  = ~5.33GiB
        //
        // 1GiB: Input buffer to encode
        // 1GiB: Existing working buffer (due to doubling of default buffer size of 8192)
        // ~2GiB: New working buffer to allocate (due to doubling)
        // ~1.33GiB: Expected output size (since the working buffer is copied at the end)
        // 32KiB: Some head room
        final long estimatedMemory = (long) size1GiB * 4 + expectedLength + 32 * 1024;
        Assume.assumeTrue("Not enough free memory for the test", presumableFreeMemory > estimatedMemory);

        final byte[] bytes = new byte[size1GiB];
        final byte[] encoded = Base64.encodeBase64(bytes);
        assertEquals(expectedLength, encoded.length);
    }
}