org.apache.james.mime4j.codec.QuotedPrintableEncodeTest.java Source code

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package org.apache.james.mime4j.codec;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Arrays;

import junit.framework.TestCase;

import org.apache.commons.io.IOUtils;
import org.apache.james.mime4j.util.CharsetUtil;

public class QuotedPrintableEncodeTest extends TestCase {

    @Override
    protected void setUp() throws Exception {
        super.setUp();
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
    }

    public void testEscapedSoftBreak() throws Exception {
        byte[] content = new byte[500];
        Arrays.fill(content, (byte) 0x20);
        byte[] expected = new byte[1557];
        int index = 0;
        for (int l = 0; l < 20; l++) {
            for (int i = 0; i < 25; i++) {
                expected[index++] = '=';
                expected[index++] = '2';
                expected[index++] = '0';
            }
            if (l < 19) {
                expected[index++] = '=';
                expected[index++] = '\r';
                expected[index++] = '\n';
            }
        }
        check(content, expected);
    }

    public void testPlainAsciiSoftBreak() throws Exception {
        byte[] content = new byte[500];
        Arrays.fill(content, (byte) 0x29);
        byte[] expected = new byte[518];
        Arrays.fill(expected, (byte) 0x29);
        expected[75] = '=';
        expected[76] = '\r';
        expected[77] = '\n';
        expected[153] = '=';
        expected[154] = '\r';
        expected[155] = '\n';
        expected[231] = '=';
        expected[232] = '\r';
        expected[233] = '\n';
        expected[309] = '=';
        expected[310] = '\r';
        expected[311] = '\n';
        expected[387] = '=';
        expected[388] = '\r';
        expected[389] = '\n';
        expected[465] = '=';
        expected[466] = '\r';
        expected[467] = '\n';
        check(content, expected);
    }

    public void testPlainASCII() throws Exception {
        checkRoundtrip("Thisisaverysimplemessage.Thisisaverysimplemessage.Thisisaverysimplemessage."
                + "Thisisaverysimplemessage.Thisisaverysimplemessage.Thisisaverysimplemessage."
                + "Thisisaverysimplemessage.Thisisaverysimplemessage.Thisisaverysimplemessage."
                + "Thisisaverysimplemessage.Thisisaverysimplemessage.Thisisaverysimplemessage.");
    }

    public void testEncodeSpace() throws Exception {
        checkRoundtrip("                 ");
    }

    public void testLetterEncoding() throws Exception {
        for (byte b = 0; b < Byte.MAX_VALUE; b++) {
            byte[] content = { b };
            checkRoundtrip(content);
        }
    }

    private void checkRoundtrip(String content) throws Exception {
        checkRoundtrip(content, CharsetUtil.US_ASCII);
    }

    private void checkRoundtrip(String content, Charset charset) throws Exception {
        checkRoundtrip(charset.encode(content).array());
    }

    private void checkRoundtrip(byte[] content) throws Exception {
        InputStream in = new ByteArrayInputStream(content);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        CodecUtil.encodeQuotedPrintableBinary(in, out);
        // read back through decoder
        in = new QuotedPrintableInputStream(new ByteArrayInputStream(out.toByteArray()));
        out = new ByteArrayOutputStream();
        IOUtils.copy(in, out);
        assertEquals(content, out.toByteArray());
    }

    private void check(byte[] content, byte[] expected) throws Exception {
        ByteArrayInputStream in = new ByteArrayInputStream(content);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        CodecUtil.encodeQuotedPrintableBinary(in, out);
        assertEquals(expected, out.toByteArray());
    }

    private void assertEquals(byte[] expected, byte[] actual) {
        assertEquals(expected.length, actual.length);
        for (int i = 0; i < actual.length; i++) {
            assertEquals("Mismatch@" + i, expected[i], actual[i]);
        }
    }
}