1 files changed, 55 insertions, 6 deletions

diff --git a/git-send-email.perl b/git-send-email.perl
index 9949db01e1..82c6feaa46 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -58,6 +58,7 @@ git send-email [options] <file | directory | rev-list options >
     --compose                      * Open an editor for introduction.
     --compose-encoding      <str>  * Encoding to assume for introduction.
     --8bit-encoding         <str>  * Encoding to assume 8bit mails if undeclared
+    --transfer-encoding     <str>  * Transfer encoding to use (quoted-printable, 8bit, base64)
 
   Sending:
     --envelope-sender       <str>  * Email envelope sender.
@@ -206,6 +207,7 @@ my ($validate, $confirm);
 my (@suppress_cc);
 my ($auto_8bit_encoding);
 my ($compose_encoding);
+my ($target_xfer_encoding);
 
 my ($debug_net_smtp) = 0;		# Net::SMTP, see send_message()
 
@@ -242,6 +244,7 @@ my %config_settings = (
     "from" => \$sender,
     "assume8bitencoding" => \$auto_8bit_encoding,
     "composeencoding" => \$compose_encoding,
+    "transferencoding" => \$target_xfer_encoding,
 );
 
 my %config_path_settings = (
@@ -314,6 +317,7 @@ my $rc = GetOptions("h" => \$help,
 		    "envelope-sender=s" => \$envelope_sender,
 		    "thread!" => \$thread,
 		    "validate!" => \$validate,
+		    "transfer-encoding=s" => \$target_xfer_encoding,
 		    "format-patch!" => \$format_patch,
 		    "8bit-encoding=s" => \$auto_8bit_encoding,
 		    "compose-encoding=s" => \$compose_encoding,
@@ -1324,6 +1328,8 @@ foreach my $t (@files) {
 	my $author_encoding;
 	my $has_content_type;
 	my $body_encoding;
+	my $xfer_encoding;
+	my $has_mime_version;
 	@to = ();
 	@cc = ();
 	@xh = ();
@@ -1394,9 +1400,16 @@ foreach my $t (@files) {
 				}
 				push @xh, $_;
 			}
+			elsif (/^MIME-Version/i) {
+				$has_mime_version = 1;
+				push @xh, $_;
+			}
 			elsif (/^Message-Id: (.*)/i) {
 				$message_id = $1;
 			}
+			elsif (/^Content-Transfer-Encoding: (.*)/i) {
+				$xfer_encoding = $1 if not defined $xfer_encoding;
+			}
 			elsif (!/^Date:\s/i && /^[-A-Za-z]+:\s+\S/) {
 				push @xh, $_;
 			}
@@ -1444,10 +1457,9 @@ foreach my $t (@files) {
 		if defined $cc_cmd && !$suppress_cc{'cccmd'};
 
 	if ($broken_encoding{$t} && !$has_content_type) {
+		$xfer_encoding = '8bit' if not defined $xfer_encoding;
 		$has_content_type = 1;
-		push @xh, "MIME-Version: 1.0",
-			"Content-Type: text/plain; charset=$auto_8bit_encoding",
-			"Content-Transfer-Encoding: 8bit";
+		push @xh, "Content-Type: text/plain; charset=$auto_8bit_encoding";
 		$body_encoding = $auto_8bit_encoding;
 	}
 
@@ -1467,14 +1479,25 @@ foreach my $t (@files) {
 				}
 			}
 			else {
+				$xfer_encoding = '8bit' if not defined $xfer_encoding;
 				$has_content_type = 1;
 				push @xh,
-				  'MIME-Version: 1.0',
-				  "Content-Type: text/plain; charset=$author_encoding",
-				  'Content-Transfer-Encoding: 8bit';
+				  "Content-Type: text/plain; charset=$author_encoding";
 			}
 		}
 	}
+	if (defined $target_xfer_encoding) {
+		$xfer_encoding = '8bit' if not defined $xfer_encoding;
+		$message = apply_transfer_encoding(
+			$message, $xfer_encoding, $target_xfer_encoding);
+		$xfer_encoding = $target_xfer_encoding;
+	}
+	if (defined $xfer_encoding) {
+		push @xh, "Content-Transfer-Encoding: $xfer_encoding";
+	}
+	if (defined $xfer_encoding or $has_content_type) {
+		unshift @xh, 'MIME-Version: 1.0' unless $has_mime_version;
+	}
 
 	$needs_confirm = (
 		$confirm eq "always" or
@@ -1543,6 +1566,32 @@ sub cleanup_compose_files {
 
 $smtp->quit if $smtp;
 
+sub apply_transfer_encoding {
+	my $message = shift;
+	my $from = shift;
+	my $to = shift;
+
+	return $message if ($from eq $to and $from ne '7bit');
+
+	require MIME::QuotedPrint;
+	require MIME::Base64;
+
+	$message = MIME::QuotedPrint::decode($message)
+		if ($from eq 'quoted-printable');
+	$message = MIME::Base64::decode($message)
+		if ($from eq 'base64');
+
+	die "cannot send message as 7bit"
+		if ($to eq '7bit' and $message =~ /[^[:ascii:]]/);
+	return $message
+		if ($to eq '7bit' or $to eq '8bit');
+	return MIME::QuotedPrint::encode($message, "\n", 0)
+		if ($to eq 'quoted-printable');
+	return MIME::Base64::encode($message, "\n")
+		if ($to eq 'base64');
+	die "invalid transfer encoding";
+}
+
 sub unique_email_list {
 	my %seen;
 	my @emails;