Binary and CR-LF detection: lone CRs -> binary

C git considers not only files containing NUL bytes as binary but also
files containing lone CRs. Implement this also for JGit.

C git additionally counts printable vs. non-printable characters and
considers files that have non_printable_count > printable_count / 128
also as binary. This is not implemented because such counting probably
only makes sense if one looks at the full file or blob content. The
Auto[CR]LF* streams in JGit look only at the first few KiB of a stream
in order not to buffer too much.

For the C git implementation, see [1].

[1] https://github.com/git/git/blob/7e27bd589d/convert.c#L35

Bug: 576971
Change-Id: Ia169b59bdbf1477f32ee2014eeb8406f81d4b1ab
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

1 files changed, 2 insertions, 2 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFInputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFInputStream.java
index b6d1848b3a..7db882c074 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFInputStream.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFInputStream.java
@@ -262,14 +262,14 @@ public class AutoLFInputStream extends InputStream {
 			return false;
 		}
 		if (detectBinary) {
-			isBinary = RawText.isBinary(buf, cnt);
+			isBinary = RawText.isBinary(buf, cnt, cnt < buf.length);
 			passAsIs = isBinary;
 			detectBinary = false;
 			if (isBinary && abortIfBinary) {
 				throw new IsBinaryException();
 			}
 			if (!passAsIs && forCheckout) {
-				passAsIs = RawText.isCrLfText(buf, cnt);
+				passAsIs = RawText.isCrLfText(buf, cnt, cnt < buf.length);
 			}
 		}
 		ptr = 0;