The regex matching chunk headers does not account for unified diffs generated with--show-function-line (with GNU diffutils for example)

Currently this library parses only the following chunk header:@@ -571,6 +571,12 @@
But this is also valid:@@ -571,6 +571,12 @@ .method public constructor <init>(Landro

This also created a very odd error far down the call stack of this method call whenold_ln andnew_ln are both equal to0 as a result of failing to parse the chunk headers.