From d3f539bf92cc48dc448347fe83ccaa9f7fab121a Mon Sep 17 00:00:00 2001
From: Vincent Richard <vincent@vincent-richard.net>
Date: Wed, 20 Feb 2013 16:07:00 +0100
Subject: [PATCH] Fixed SMTP dot stuffing at the beginning of content.

---
 src/utility/filteredStream.cpp       | 25 ++++++++++++++++++++++++-
 tests/utility/filteredStreamTest.cpp |  6 ++++++
 vmime/utility/filteredStream.hpp     |  3 ++-
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/utility/filteredStream.cpp b/src/utility/filteredStream.cpp
index 526ee79c..9af7b32a 100644
--- a/src/utility/filteredStream.cpp
+++ b/src/utility/filteredStream.cpp
@@ -137,7 +137,7 @@ stream::size_type dotFilteredInputStream::skip(const size_type /* count */)
 // dotFilteredOutputStream
 
 dotFilteredOutputStream::dotFilteredOutputStream(outputStream& os)
-	: m_stream(os), m_previousChar('\0')
+	: m_stream(os), m_previousChar('\0'), m_start(true)
 {
 }
 
@@ -158,6 +158,17 @@ void dotFilteredOutputStream::write
 	const value_type* end = data + count;
 	const value_type* start = data;
 
+	if (m_previousChar == '.')
+	{
+		if (data[0] == '\n' || data[0] == '\r')
+		{
+			m_stream.write(".", 1);  // extra <DOT>
+			m_stream.write(data, 1);
+
+			pos = data + 1;
+		}
+	}
+
 	// Replace "\n." with "\n.."
 	while ((pos = std::find(pos, end, '.')) != end)
 	{
@@ -171,12 +182,24 @@ void dotFilteredOutputStream::write
 
 			start = pos + 1;
 		}
+		else if (pos == data && m_start)  // <DOT><CR><LF> at the beginning of content
+		{
+			m_stream.write(start, pos - start);
+
+			if (pos + 1 < end && (*(pos + 1) == '\n' || *(pos + 1) == '\r'))
+				m_stream.write("..", 2);
+			else
+				m_stream.write(".", 1);
+
+			start = pos + 1;
+		}
 
 		++pos;
 	}
 
 	m_stream.write(start, end - start);
 	m_previousChar = data[count - 1];
+	m_start = false;
 }
 
 
diff --git a/tests/utility/filteredStreamTest.cpp b/tests/utility/filteredStreamTest.cpp
index 27ec458f..8dc4d182 100644
--- a/tests/utility/filteredStreamTest.cpp
+++ b/tests/utility/filteredStreamTest.cpp
@@ -163,6 +163,12 @@ VMIME_TEST_SUITE_BEGIN
 		testFilteredOutputStreamHelper<FILTER>("3", "foo\n..bar", "foo", "\n.bar");
 		testFilteredOutputStreamHelper<FILTER>("4", "foo\n..bar", "foo", "\n", ".bar");
 		testFilteredOutputStreamHelper<FILTER>("5", "foo\n..bar", "foo", "\n", ".", "bar");
+
+		testFilteredOutputStreamHelper<FILTER>("6", "..\nfoobar", ".\nfoobar");
+		testFilteredOutputStreamHelper<FILTER>("7", "..\r\nfoobar", ".\r\nfoobar");
+		testFilteredOutputStreamHelper<FILTER>("8", "..\r\nfoobar", ".\r", "\nfoobar");
+		testFilteredOutputStreamHelper<FILTER>("9", ".foobar", ".foobar");
+		testFilteredOutputStreamHelper<FILTER>("10", ".foobar", ".", "foobar");
 	}
 
 	void testCRLFToLFFilteredOutputStream()
diff --git a/vmime/utility/filteredStream.hpp b/vmime/utility/filteredStream.hpp
index eb46143f..b7ec010f 100644
--- a/vmime/utility/filteredStream.hpp
+++ b/vmime/utility/filteredStream.hpp
@@ -123,8 +123,9 @@ public:
 
 private:
 
-        outputStream& m_stream;
+	outputStream& m_stream;
 	value_type m_previousChar;
+	bool m_start;
 };