Merge branch 'rd/send-email-2047-fix'

"git send-email" did not handle RFC 2047 encoded headers quite
right.

* rd/send-email-2047-fix:
  send-email: handle adjacent RFC 2047-encoded words properly
  send-email: align RFC 2047 decoding more closely with the spec

1 files changed, 25 insertions, 11 deletions

diff --git a/git-send-email.perl b/git-send-email.perl
index 82c6feaa46..58c8bc2a59 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -146,6 +146,11 @@ my $have_mail_address = eval { require Mail::Address; 1 };
 my $smtp;
 my $auth;
 
+# Regexes for RFC 2047 productions.
+my $re_token = qr/[^][()<>@,;:\\"\/?.= \000-\037\177-\377]+/;
+my $re_encoded_text = qr/[^? \000-\037\177-\377]+/;
+my $re_encoded_word = qr/=\?($re_token)\?($re_token)\?($re_encoded_text)\?=/;
+
 # Variables we fill in automatically, or via prompting:
 my (@to,$no_to,@initial_to,@cc,$no_cc,@initial_cc,@bcclist,$no_bcc,@xh,
 	$initial_reply_to,$initial_subject,@files,
@@ -917,15 +922,26 @@ $time = time - scalar $#files;
 
 sub unquote_rfc2047 {
 	local ($_) = @_;
-	my $encoding;
-	s{=\?([^?]+)\?q\?(.*?)\?=}{
-		$encoding = $1;
-		my $e = $2;
-		$e =~ s/_/ /g;
-		$e =~ s/=([0-9A-F]{2})/chr(hex($1))/eg;
-		$e;
+	my $charset;
+	my $sep = qr/[ \t]+/;
+	s{$re_encoded_word(?:$sep$re_encoded_word)*}{
+		my @words = split $sep, $&;
+		foreach (@words) {
+			m/$re_encoded_word/;
+			$charset = $1;
+			my $encoding = $2;
+			my $text = $3;
+			if ($encoding eq 'q' || $encoding eq 'Q') {
+				$_ = $text;
+				s/_/ /g;
+				s/=([0-9A-F]{2})/chr(hex($1))/egi;
+			} else {
+				# other encodings not supported yet
+			}
+		}
+		join '', @words;
 	}eg;
-	return wantarray ? ($_, $encoding) : $_;
+	return wantarray ? ($_, $charset) : $_;
 }
 
 sub quote_rfc2047 {
@@ -938,10 +954,8 @@ sub quote_rfc2047 {
 
 sub is_rfc2047_quoted {
 	my $s = shift;
-	my $token = qr/[^][()<>@,;:"\/?.= \000-\037\177-\377]+/;
-	my $encoded_text = qr/[!->@-~]+/;
 	length($s) <= 75 &&
-	$s =~ m/^(?:"[[:ascii:]]*"|=\?$token\?$token\?$encoded_text\?=)$/o;
+	$s =~ m/^(?:"[[:ascii:]]*"|$re_encoded_word)$/o;
 }
 
 sub subject_needs_rfc2047_quoting {