core/src/test/java/org/apache/james/mime4j/io/EOLConvertingInputStreamTest.java

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package org.apache.james.mime4j.io;

import java.io.IOException;

import org.apache.james.mime4j.util.ContentUtil;
import org.junit.Assert;
import org.junit.Test;

public class EOLConvertingInputStreamTest {

    @Test
    public void testRead() throws IOException {
        testConvertBoth("Line 1\r\nLine 2\r\n", "Line 1\r\nLine 2\r\n");
        testConvertCR("Line 1\r\nLine 2\r\n", "Line 1\r\nLine 2\r\n");
        testConvertLF("Line 1\r\nLine 2\r\n", "Line 1\r\nLine 2\r\n");

        testConvertBoth("Line 1\n\rLine 2\n\r", "Line 1\r\n\r\nLine 2\r\n\r\n");
        testConvertCR("Line 1\n\rLine 2\n\r", "Line 1\n\r\nLine 2\n\r\n");
        testConvertLF("Line 1\n\rLine 2\n\r", "Line 1\r\n\rLine 2\r\n\r");

        testConvertBoth("Line 1\nLine 2\n", "Line 1\r\nLine 2\r\n");
        testConvertCR("Line 1\nLine 2\n", "Line 1\nLine 2\n");
        testConvertLF("Line 1\nLine 2\n", "Line 1\r\nLine 2\r\n");

        testConvertBoth("Line 1\rLine 2\r", "Line 1\r\nLine 2\r\n");
        testConvertCR("Line 1\rLine 2\r", "Line 1\r\nLine 2\r\n");
        testConvertLF("Line 1\rLine 2\r", "Line 1\rLine 2\r");

        testConvertBoth("\r\n", "\r\n");
        testConvertCR("\r\n", "\r\n");
        testConvertLF("\r\n", "\r\n");

        testConvertBoth("\n", "\r\n");
        testConvertCR("\n", "\n");
        testConvertLF("\n", "\r\n");

        testConvertBoth("\r", "\r\n");
        testConvertCR("\r", "\r\n");
        testConvertLF("\r", "\r");

        testConvertBoth("", "");
        testConvertCR("", "");
        testConvertLF("", "");
    }

    private void testConvertBoth(String s1, String s2) throws IOException {
        byte[] bytes = new byte[1024];

        EOLConvertingInputStream in =
                new EOLConvertingInputStream(InputStreams.createAscii(s1),
                        EOLConvertingInputStream.CONVERT_BOTH);
        int n = in.read(bytes);
        Assert.assertEquals(s2, ContentUtil.toAsciiString(bytes, 0, Math.max(n, 0)));

        in.close();
    }

    private void testConvertCR(String s1, String s2) throws IOException {
        byte[] bytes = new byte[1024];

        EOLConvertingInputStream in =
                new EOLConvertingInputStream(InputStreams.createAscii(s1),
                        EOLConvertingInputStream.CONVERT_CR);
        int n = in.read(bytes);
        Assert.assertEquals(s2, ContentUtil.toAsciiString(bytes, 0, Math.max(n, 0)));

        in.close();
    }

    private void testConvertLF(String s1, String s2) throws IOException {
        byte[] bytes = new byte[1024];

        EOLConvertingInputStream in =
                new EOLConvertingInputStream(InputStreams.createAscii(s1),
                        EOLConvertingInputStream.CONVERT_LF);
        int n = in.read(bytes);
        Assert.assertEquals(s2, ContentUtil.toAsciiString(bytes, 0, Math.max(n, 0)));

        in.close();
    }

}