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81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_CERT_PEM_TOKENIZER_H_
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#define NET_CERT_PEM_TOKENIZER_H_
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#include <stddef.h>
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#include <string>
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#include <vector>
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#include "base/macros.h"
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#include "base/strings/string_piece.h"
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#include "net/base/net_export.h"
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namespace net {
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// PEMTokenizer is a utility class for the parsing of data encapsulated
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// using RFC 1421, Privacy Enhancement for Internet Electronic Mail. It
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// does not implement the full specification, most notably it does not
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// support the Encapsulated Header Portion described in Section 4.4.
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class NET_EXPORT_PRIVATE PEMTokenizer {
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public:
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// Create a new PEMTokenizer that iterates through |str| searching for
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// instances of PEM encoded blocks that are of the |allowed_block_types|.
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// |str| must remain valid for the duration of the PEMTokenizer.
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PEMTokenizer(const base::StringPiece& str,
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const std::vector<std::string>& allowed_block_types);
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~PEMTokenizer();
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// Attempts to decode the next PEM block in the string. Returns false if no
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// PEM blocks can be decoded. The decoded PEM block will be available via
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// data().
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bool GetNext();
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// Returns the PEM block type (eg: CERTIFICATE) of the last successfully
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// decoded PEM block.
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// GetNext() must have returned true before calling this method.
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const std::string& block_type() const { return block_type_; }
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// Returns the raw, Base64-decoded data of the last successfully decoded
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// PEM block.
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// GetNext() must have returned true before calling this method.
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const std::string& data() const { return data_; }
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private:
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void Init(const base::StringPiece& str,
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const std::vector<std::string>& allowed_block_types);
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// A simple cache of the allowed PEM header and footer for a given PEM
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// block type, so that it is only computed once.
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struct PEMType;
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// The string to search, which must remain valid for as long as this class
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// is around.
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base::StringPiece str_;
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// The current position within |str_| that searching should begin from,
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// or StringPiece::npos if iteration is complete
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base::StringPiece::size_type pos_;
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// The type of data that was encoded, as indicated in the PEM
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// Pre-Encapsulation Boundary (eg: CERTIFICATE, PKCS7, or
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// PRIVACY-ENHANCED MESSAGE).
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std::string block_type_;
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// The types of PEM blocks that are allowed. PEM blocks that are not of
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// one of these types will be skipped.
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std::vector<PEMType> block_types_;
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// The raw (Base64-decoded) data of the last successfully decoded block.
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std::string data_;
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DISALLOW_COPY_AND_ASSIGN(PEMTokenizer);
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};
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} // namespace net
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#endif // NET_CERT_PEM_TOKENIZER_H_
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