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https://issues.apache.org/jira/browse/MIME4J-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911838#comment-17911838
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hung commented on MIME4J-330:
-----------------------------
pr https://github.com/apache/james-mime4j/pull/113
> Regression in MimeStreamParser: part body stream ends with CR
> -------------------------------------------------------------
>
> Key: MIME4J-330
> URL: https://issues.apache.org/jira/browse/MIME4J-330
> Project: James Mime4j
> Issue Type: Bug
> Reporter: René Cordier
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> A member of the community, Madis Loitmaa (madis.loit...@gmail.com) reported
> on the ML to have spotted a regression in the MimeStreamParser: part body
> stream ends with CR.
> Specifically, when processing messages with certain body lengths, the
> CR character (from the CRLF sequence preceding the boundary marker) is
> incorrectly included as the last character of the part body.
> Environment:
> This issue was identified after upgrading Mime4j in our project from
> version 0.8.7 to 0.8.11. It appears to affect all versions starting
> from 0.8.8.
> Reproduction:
> - Madis has attached a unit test, which demonstrates the
> problem. The test fails for a part body length of 4051 bytes on the
> current master branch (commit
> 85995590ad6700cc8bf7a3b8462ce87843dab5bd), but passes when tested with
> version 0.8.7 (commit ed5a50c8071080b4eaedd6ab13baf25843d691a3).
> - The bug appears when CRLF is used as the line separator. The issue
> does not occur when LF is used.
>
> Here is the unit test:
> {code:java}
> // file src/test/java/org/apache/james/mime4j/parser/PartLengthTest.java
> package org.apache.james.mime4j.parser;
> import org.apache.commons.io.IOUtils;
> import org.apache.james.mime4j.MimeException;
> import org.apache.james.mime4j.stream.BodyDescriptor;
> import org.junit.Assert;
> import org.junit.Test;
> import java.io.ByteArrayInputStream;
> import java.io.IOException;
> import java.io.InputStream;
> import java.nio.charset.StandardCharsets;
> public class PartLengthTest {
> @Test
> public void testExtractPartWithDifferentLengths() throws Exception {
> StringBuilder partBuilder = new StringBuilder();
> for (int i = 1; i <= 5000; i++) {
> partBuilder.append(i % 80 == 0 ? "\n" : "A");
> String part = partBuilder.toString();
> String mimeMessage = createMimeMultipart(part);
> String extracted = extractPart(mimeMessage);
> if (!part.equals(extracted)) {
> System.out.println("Extracted part comparison failed
> for part length " + i);
> }
> Assert.assertEquals(part, extracted);
> }
> }
> private String createMimeMultipart(String part) {
> return "Content-type: multipart/mixed; boundary=QvEgqhjEnYxz\r\n"
> + "\r\n"
> + "--QvEgqhjEnYxz\r\n"
> + "Content-Type: text/plain\r\n"
> + "\r\n"
> + part
> + "\r\n"
> + "--QvEgqhjEnYxz--\r\n";
> }
> private String extractPart(String mimeMessage) throws
> MimeException, IOException {
> String[] resultWrapper = new String[1];
> MimeStreamParser parser = new MimeStreamParser();
> parser.setContentHandler(new AbstractContentHandler() {
> @Override
> public void body(BodyDescriptor bd, InputStream is) throws
> MimeException, IOException {
> resultWrapper[0] = new String(IOUtils.toString(is,
> StandardCharsets.UTF_8).getBytes());
> }
> });
> parser.parse(new ByteArrayInputStream(mimeMessage.getBytes()));
> return resultWrapper[0];
> }
> }
> //end-of-file{code}
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