1 | // |
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2 | // DigestStream.h |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/include/Poco/DigestStream.h#1 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Crypt |
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8 | // Module: DigestStream |
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9 | // |
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10 | // Definition of classes DigestInputStream and DigestOutputStream. |
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11 | // |
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12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef Foundation_DigestStream_INCLUDED |
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40 | #define Foundation_DigestStream_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/Foundation.h" |
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44 | #include "Poco/BufferedStreamBuf.h" |
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45 | #include "Poco/DigestEngine.h" |
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46 | #include <istream> |
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47 | #include <ostream> |
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48 | |
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49 | |
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50 | namespace Poco { |
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51 | |
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52 | |
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53 | class Foundation_API DigestBuf: public BufferedStreamBuf |
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54 | /// This streambuf computes a digest of all data going |
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55 | /// through it. |
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56 | { |
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57 | public: |
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58 | DigestBuf(DigestEngine& eng); |
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59 | DigestBuf(DigestEngine& eng, std::istream& istr); |
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60 | DigestBuf(DigestEngine& eng, std::ostream& ostr); |
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61 | ~DigestBuf(); |
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62 | int readFromDevice(char* buffer, std::streamsize length); |
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63 | int writeToDevice(const char* buffer, std::streamsize length); |
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64 | void close(); |
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65 | |
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66 | private: |
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67 | DigestEngine& _eng; |
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68 | std::istream* _pIstr; |
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69 | std::ostream* _pOstr; |
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70 | static const int BUFFER_SIZE; |
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71 | }; |
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72 | |
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73 | |
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74 | class Foundation_API DigestIOS: public virtual std::ios |
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75 | /// The base class for DigestInputStream and DigestOutputStream. |
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76 | /// |
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77 | /// This class is needed to ensure the correct initialization |
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78 | /// order of the stream buffer and base classes. |
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79 | { |
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80 | public: |
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81 | DigestIOS(DigestEngine& eng); |
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82 | DigestIOS(DigestEngine& eng, std::istream& istr); |
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83 | DigestIOS(DigestEngine& eng, std::ostream& ostr); |
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84 | ~DigestIOS(); |
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85 | DigestBuf* rdbuf(); |
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86 | |
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87 | protected: |
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88 | DigestBuf _buf; |
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89 | }; |
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90 | |
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91 | |
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92 | class Foundation_API DigestInputStream: public DigestIOS, public std::istream |
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93 | /// This istream computes a digest of |
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94 | /// all the data passing through it, |
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95 | /// using a DigestEngine. |
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96 | { |
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97 | public: |
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98 | DigestInputStream(DigestEngine& eng, std::istream& istr); |
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99 | ~DigestInputStream(); |
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100 | }; |
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101 | |
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102 | |
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103 | class Foundation_API DigestOutputStream: public DigestIOS, public std::ostream |
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104 | /// This ostream computes a digest of |
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105 | /// all the data passing through it, |
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106 | /// using a DigestEngine. |
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107 | /// To ensure that all data has been incorporated |
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108 | /// into the digest, call close() or flush() before |
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109 | /// you obtain the digest from the digest engine. |
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110 | { |
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111 | public: |
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112 | DigestOutputStream(DigestEngine& eng); |
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113 | DigestOutputStream(DigestEngine& eng, std::ostream& ostr); |
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114 | ~DigestOutputStream(); |
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115 | void close(); |
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116 | }; |
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117 | |
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118 | |
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119 | } // namespace Poco |
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120 | |
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121 | |
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122 | #endif // Foundation_DigestStream_INCLUDED |
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