1 | // |
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2 | // Base64Decoder.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/Base64Decoder.cpp#3 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Streams |
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8 | // Module: Base64 |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include "Poco/Base64Decoder.h" |
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38 | #include "Poco/Base64Encoder.h" |
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39 | #include "Poco/Exception.h" |
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40 | #include "Poco/Mutex.h" |
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41 | |
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42 | |
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43 | namespace Poco { |
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44 | |
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45 | |
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46 | unsigned char Base64DecoderBuf::IN_ENCODING[256]; |
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47 | bool Base64DecoderBuf::IN_ENCODING_INIT = false; |
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48 | |
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49 | |
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50 | Base64DecoderBuf::Base64DecoderBuf(std::istream& istr): |
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51 | _groupLength(0), |
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52 | _groupIndex(0), |
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53 | _istr(istr) |
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54 | { |
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55 | static FastMutex mutex; |
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56 | FastMutex::ScopedLock lock(mutex); |
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57 | if (!IN_ENCODING_INIT) |
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58 | { |
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59 | for (unsigned i = 0; i < sizeof(IN_ENCODING); i++) |
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60 | { |
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61 | IN_ENCODING[i] = 0xFF; |
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62 | } |
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63 | for (unsigned i = 0; i < sizeof(Base64EncoderBuf::OUT_ENCODING); i++) |
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64 | { |
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65 | IN_ENCODING[Base64EncoderBuf::OUT_ENCODING[i]] = i; |
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66 | } |
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67 | IN_ENCODING[static_cast<unsigned char>('=')] = '\0'; |
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68 | IN_ENCODING_INIT = true; |
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69 | } |
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70 | } |
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71 | |
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72 | |
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73 | Base64DecoderBuf::~Base64DecoderBuf() |
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74 | { |
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75 | } |
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76 | |
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77 | |
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78 | int Base64DecoderBuf::readFromDevice() |
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79 | { |
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80 | if (_groupIndex < _groupLength) |
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81 | { |
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82 | return _group[_groupIndex++]; |
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83 | } |
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84 | else |
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85 | { |
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86 | unsigned char buffer[4]; |
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87 | int c; |
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88 | if ((c = readOne()) == -1) return -1; |
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89 | buffer[0] = (unsigned char) c; |
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90 | if (IN_ENCODING[buffer[0]] == 0xFF) throw DataFormatException(); |
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91 | if ((c = readOne()) == -1) throw DataFormatException(); |
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92 | buffer[1] = (unsigned char) c; |
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93 | if (IN_ENCODING[buffer[1]] == 0xFF) throw DataFormatException(); |
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94 | if ((c = readOne()) == -1) throw DataFormatException(); |
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95 | buffer[2] = c; |
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96 | if (IN_ENCODING[buffer[2]] == 0xFF) throw DataFormatException(); |
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97 | if ((c = readOne()) == -1) throw DataFormatException(); |
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98 | buffer[3] = c; |
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99 | if (IN_ENCODING[buffer[3]] == 0xFF) throw DataFormatException(); |
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100 | |
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101 | _group[0] = (IN_ENCODING[buffer[0]] << 2) | (IN_ENCODING[buffer[1]] >> 4); |
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102 | _group[1] = ((IN_ENCODING[buffer[1]] & 0x0F) << 4) | (IN_ENCODING[buffer[2]] >> 2); |
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103 | _group[2] = (IN_ENCODING[buffer[2]] << 6) | IN_ENCODING[buffer[3]]; |
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104 | |
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105 | if (buffer[2] == '=') |
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106 | _groupLength = 1; |
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107 | else if (buffer[3] == '=') |
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108 | _groupLength = 2; |
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109 | else |
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110 | _groupLength = 3; |
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111 | _groupIndex = 1; |
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112 | return _group[0]; |
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113 | } |
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114 | } |
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115 | |
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116 | |
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117 | int Base64DecoderBuf::readOne() |
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118 | { |
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119 | int ch = _istr.get(); |
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120 | while (ch == ' ' || ch == '\r' || ch == '\t' || ch == '\n') |
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121 | ch = _istr.get(); |
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122 | return ch; |
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123 | } |
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124 | |
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125 | |
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126 | Base64DecoderIOS::Base64DecoderIOS(std::istream& istr): _buf(istr) |
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127 | { |
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128 | poco_ios_init(&_buf); |
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129 | } |
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130 | |
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131 | |
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132 | Base64DecoderIOS::~Base64DecoderIOS() |
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133 | { |
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134 | } |
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135 | |
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136 | |
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137 | Base64DecoderBuf* Base64DecoderIOS::rdbuf() |
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138 | { |
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139 | return &_buf; |
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140 | } |
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141 | |
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142 | |
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143 | Base64Decoder::Base64Decoder(std::istream& istr): Base64DecoderIOS(istr), std::istream(&_buf) |
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144 | { |
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145 | } |
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146 | |
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147 | |
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148 | Base64Decoder::~Base64Decoder() |
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149 | { |
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150 | } |
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151 | |
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152 | |
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153 | } // namespace Poco |
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