net: extract net/cert out of net/base

net/base/pem_tokenizer.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 NET_BASE_PEM_TOKENIZER_H_
-#define NET_BASE_PEM_TOKENIZER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/string_piece.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-// PEMTokenizer is a utility class for the parsing of data encapsulated
-// using RFC 1421, Privacy Enhancement for Internet Electronic Mail. It
-// does not implement the full specification, most notably it does not
-// support the Encapsulated Header Portion described in Section 4.4.
-class NET_EXPORT_PRIVATE PEMTokenizer {
- public:
-  // Create a new PEMTokenizer that iterates through |str| searching for
-  // instances of PEM encoded blocks that are of the |allowed_block_types|.
-  // |str| must remain valid for the duration of the PEMTokenizer.
-  PEMTokenizer(const base::StringPiece& str,
-               const std::vector<std::string>& allowed_block_types);
-  ~PEMTokenizer();
-
-  // Attempts to decode the next PEM block in the string. Returns false if no
-  // PEM blocks can be decoded. The decoded PEM block will be available via
-  // data().
-  bool GetNext();
-
-  // Returns the PEM block type (eg: CERTIFICATE) of the last successfully
-  // decoded PEM block.
-  // GetNext() must have returned true before calling this method.
-  const std::string& block_type() const { return block_type_; }
-
-  // Returns the raw, Base64-decoded data of the last successfully decoded
-  // PEM block.
-  // GetNext() must have returned true before calling this method.
-  const std::string& data() const { return data_; }
-
- private:
-  void Init(const base::StringPiece& str,
-            const std::vector<std::string>& allowed_block_types);
-
-  // A simple cache of the allowed PEM header and footer for a given PEM
-  // block type, so that it is only computed once.
-  struct PEMType;
-
-  // The string to search, which must remain valid for as long as this class
-  // is around.
-  base::StringPiece str_;
-
-  // The current position within |str_| that searching should begin from,
-  // or StringPiece::npos if iteration is complete
-  base::StringPiece::size_type pos_;
-
-  // The type of data that was encoded, as indicated in the PEM
-  // Pre-Encapsulation Boundary (eg: CERTIFICATE, PKCS7, or
-  // PRIVACY-ENHANCED MESSAGE).
-  std::string block_type_;
-
-  // The types of PEM blocks that are allowed. PEM blocks that are not of
-  // one of these types will be skipped.
-  std::vector<PEMType> block_types_;
-
-  // The raw (Base64-decoded) data of the last successfully decoded block.
-  std::string data_;
-
-  DISALLOW_COPY_AND_ASSIGN(PEMTokenizer);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_PEM_TOKENIZER_H_