Add an encoder/decoder for quoted-printable.

chrome/browser/net/quoted_printable.h

Index: chrome/browser/net/quoted_printable.h
diff --git a/chrome/browser/net/quoted_printable.h b/chrome/browser/net/quoted_printable.h
new file mode 100644
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+++ b/chrome/browser/net/quoted_printable.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_NET_QUOTED_PRINTABLE_H_
+#define CHROME_BROWSER_NET_QUOTED_PRINTABLE_H_
+#pragma once
+
+#include <string>
+
+// Some functions to encode/decode with the quoted-printable encoding.
+// See http://tools.ietf.org/html/rfc2045#section-6.7
+
+namespace chrome {
+namespace browser {
+namespace net {
+
+// Encodes the input string with the quoted-printable encoding.
+void QuotedPrintableEncode(const std::string& input, std::string* output);
+
+// Decodes the quoted-printable input string.  Returns true if the input string
+// was wellformed quoted-printable, false otherwise, in which case it still
+// decodes as much of the message as possible.
+bool QuotedPrintableDecode(const std::string& input, std::string* output);
+
+// Returns 0 if |iter| does not point to an end-of-line, the number of chars
+// that constitutes that EOL otherwise (1 for LF, 2 for CR-LF).
+// Exposed as it is also used in unit-tests.
+int IsEOL(const std::string::const_iterator& iter, const std::string& input);
+
+}  // namespace net
+}  // namespace browser
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_NET_QUOTED_PRINTABLE_H_