Add an encoder/decoder for quoted-printable.

chrome/browser/net/quoted_printable.h

+// 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_browser_net {

[brettw, 2011/02/28 17:33:14]

We're trying to standardize on using nested namespaces. Although this doesn't
match the existing code, I'd prefer doin the new way, so this would be
namespace chrome {
namespace browser {
namespace net {

[Jay Civelli, 2011/02/28 19:25:53]

Done.

+
+// 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);

[tfarina, 2011/02/28 18:32:44]

Is this going to be used by the consumers (i.e is this part of the public API as
the two functions above)? If not, can you move this to the source file? 

[Jay Civelli, 2011/02/28 19:25:53]

As the comment mentions, this is also used by the unit-tests, this is why it is
exposed.

+
+}  // namespace chrome_browser_net
+
+#endif  // CHROME_BROWSER_NET_QUOTED_PRINTABLE_H_