Recognize CRLF when parsing the short message of a commit or tag

Bug: 400707
Change-Id: I9b09bb88528af465018fc0278f5441f7e6b75986

org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevCommitParseTest.java

@@ -383,6 +383,19 @@ public class RevCommitParseTest extends RepositoryTestCase {
 		assertEquals(src.getMessage(), p.getFullMessage());
 	}
 
+	@Test
+	public void testParse_GitStyleMessageWithCRLF() throws Exception {
+		final String shortMsgIn = "This fixes a\r\nbug.\r\n\r\n";
+		final String shortMsg = "This fixes a bug.";
+		final String body = "We do it with magic and pixie dust\r\nand stuff.\r\n"
+				+ "\r\n\r\n"
+				+ "Signed-off-by: A U. Thor <author@example.com>\r\n";
+		final String fullMsg = shortMsgIn + "\r\n" + "\r\n" + body;
+		final RevCommit c = create(fullMsg);
+		assertEquals(fullMsg, c.getFullMessage());
+		assertEquals(shortMsg, c.getShortMessage());
+	}
+
 	private static ObjectId id(final String str) {
 		return ObjectId.fromString(str);
 	}

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/StringUtilsTest.java

@@ -91,4 +91,16 @@ public class StringUtilsTest {
 		assertTrue(StringUtils.equalsIgnoreCase("A", "a"));
 		assertTrue(StringUtils.equalsIgnoreCase("a", "A"));
 	}
+
+	@Test
+	public void testReplaceLineBreaks() {
+		assertEquals("a b c ",
+				StringUtils.replaceLineBreaksWithSpace("a b\nc\r"));
+		assertEquals("a b c ",
+				StringUtils.replaceLineBreaksWithSpace("a b\nc\n"));
+		assertEquals("a b c ",
+				StringUtils.replaceLineBreaksWithSpace("a b\nc\r\n"));
+		assertEquals("a b c d",
+				StringUtils.replaceLineBreaksWithSpace("a\r\nb\nc d"));
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevCommit.java

@@ -59,6 +59,7 @@ import org.eclipse.jgit.lib.ObjectInserter;
 import org.eclipse.jgit.lib.ObjectReader;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.util.RawParseUtils;
+import org.eclipse.jgit.util.StringUtils;
 
 /** A commit reference to a commit in the DAG. */
 public class RevCommit extends RevObject {
@@ -421,7 +422,7 @@ public class RevCommit extends RevObject {
 		final int msgE = RawParseUtils.endOfParagraph(raw, msgB);
 		String str = RawParseUtils.decode(enc, raw, msgB, msgE);
 		if (hasLF(raw, msgB, msgE))
-			str = str.replace('\n', ' ');
+			str = StringUtils.replaceLineBreaksWithSpace(str);
 		return str;
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevTag.java

@@ -58,6 +58,7 @@ import org.eclipse.jgit.lib.ObjectReader;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.util.MutableInteger;
 import org.eclipse.jgit.util.RawParseUtils;
+import org.eclipse.jgit.util.StringUtils;
 
 /** An annotated tag. */
 public class RevTag extends RevObject {
@@ -234,7 +235,7 @@ public class RevTag extends RevObject {
 		final int msgE = RawParseUtils.endOfParagraph(raw, msgB);
 		String str = RawParseUtils.decode(enc, raw, msgB, msgE);
 		if (RevCommit.hasLF(raw, msgB, msgE))
-			str = str.replace('\n', ' ');
+			str = StringUtils.replaceLineBreaksWithSpace(str);
 		return str;
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java

@@ -1058,7 +1058,7 @@ public final class RawParseUtils {
 	/**
 	 * Locate the end of a paragraph.
 	 * <p>
-	 * A paragraph is ended by two consecutive LF bytes.
+	 * A paragraph is ended by two consecutive LF bytes or CRLF pairs
 	 *
 	 * @param b
 	 *            buffer to scan.
@@ -1072,9 +1072,11 @@ public final class RawParseUtils {
 	public static final int endOfParagraph(final byte[] b, final int start) {
 		int ptr = start;
 		final int sz = b.length;
-		while (ptr < sz && b[ptr] != '\n')
+		while (ptr < sz && (b[ptr] != '\n' && b[ptr] != '\r'))
 			ptr = nextLF(b, ptr);
-		while (0 < ptr && start < ptr && b[ptr - 1] == '\n')
+		if (ptr > start && b[ptr - 1] == '\n')
+			ptr--;
+		if (ptr > start && b[ptr - 1] == '\r')
 			ptr--;
 		return ptr;
 	}

org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java

@@ -279,4 +279,30 @@ public final class StringUtils {
 	public static boolean isEmptyOrNull(String stringValue) {
 		return stringValue == null || stringValue.length() == 0;
 	}
+
+	/**
+	 * Replace CRLF, CR or LF with a single space.
+	 *
+	 * @param in
+	 *            A string with line breaks
+	 * @return in without line breaks
+	 */
+	public static String replaceLineBreaksWithSpace(String in) {
+		char[] buf = new char[in.length()];
+		int o = 0;
+		for (int i = 0; i < buf.length; ++i) {
+			char ch = in.charAt(i);
+			if (ch == '\r') {
+				if (i + 1 < buf.length && in.charAt(i + 1) == '\n') {
+					buf[o++] = ' ';
+					++i;
+				} else
+					buf[o++] = ' ';
+			} else if (ch == '\n')
+				buf[o++] = ' ';
+			else
+				buf[o++] = ch;
+		}
+		return new String(buf, 0, o);
+	}
 }