1 | // |
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2 | // DeflatingStream.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/DeflatingStream.cpp#2 $ |
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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: ZLibStream |
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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/DeflatingStream.h" |
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38 | #include "Poco/Exception.h" |
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39 | |
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40 | |
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41 | namespace Poco { |
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42 | |
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43 | |
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44 | DeflatingStreamBuf::DeflatingStreamBuf(std::istream& istr, StreamType type, int level): |
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45 | BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::in), |
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46 | _pIstr(&istr), |
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47 | _pOstr(0), |
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48 | _eof(false) |
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49 | { |
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50 | _zstr.zalloc = Z_NULL; |
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51 | _zstr.zfree = Z_NULL; |
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52 | _zstr.opaque = Z_NULL; |
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53 | _zstr.next_in = 0; |
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54 | _zstr.avail_in = 0; |
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55 | _zstr.next_out = 0; |
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56 | _zstr.avail_out = 0; |
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57 | |
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58 | int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY); |
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59 | if (rc != Z_OK) throw IOException(zError(rc)); |
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60 | |
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61 | _buffer = new char[DEFLATE_BUFFER_SIZE]; |
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62 | } |
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63 | |
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64 | |
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65 | DeflatingStreamBuf::DeflatingStreamBuf(std::ostream& ostr, StreamType type, int level): |
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66 | BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::out), |
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67 | _pIstr(0), |
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68 | _pOstr(&ostr), |
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69 | _eof(false) |
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70 | { |
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71 | _zstr.zalloc = Z_NULL; |
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72 | _zstr.zfree = Z_NULL; |
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73 | _zstr.opaque = Z_NULL; |
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74 | _zstr.next_in = 0; |
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75 | _zstr.avail_in = 0; |
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76 | _zstr.next_out = 0; |
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77 | _zstr.avail_out = 0; |
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78 | |
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79 | int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY); |
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80 | if (rc != Z_OK) throw IOException(zError(rc)); |
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81 | |
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82 | _buffer = new char[DEFLATE_BUFFER_SIZE]; |
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83 | } |
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84 | |
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85 | |
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86 | DeflatingStreamBuf::~DeflatingStreamBuf() |
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87 | { |
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88 | try |
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89 | { |
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90 | close(); |
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91 | } |
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92 | catch (...) |
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93 | { |
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94 | } |
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95 | delete [] _buffer; |
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96 | } |
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97 | |
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98 | |
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99 | int DeflatingStreamBuf::close() |
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100 | { |
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101 | sync(); |
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102 | if (_pIstr) |
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103 | { |
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104 | int rc = deflateEnd(&_zstr); |
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105 | if (rc != Z_OK) throw IOException(zError(rc)); |
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106 | _pIstr = 0; |
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107 | } |
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108 | else if (_pOstr) |
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109 | { |
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110 | if (_zstr.next_out) |
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111 | { |
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112 | int rc = deflate(&_zstr, Z_FINISH); |
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113 | if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc)); |
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114 | _pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out); |
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115 | if (!_pOstr->good()) throw IOException(zError(rc)); |
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116 | _zstr.next_out = (unsigned char*) _buffer; |
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117 | _zstr.avail_out = DEFLATE_BUFFER_SIZE; |
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118 | while (rc != Z_STREAM_END) |
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119 | { |
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120 | rc = deflate(&_zstr, Z_FINISH); |
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121 | if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc)); |
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122 | _pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out); |
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123 | if (!_pOstr->good()) throw IOException(zError(rc)); |
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124 | _zstr.next_out = (unsigned char*) _buffer; |
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125 | _zstr.avail_out = DEFLATE_BUFFER_SIZE; |
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126 | } |
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127 | rc = deflateEnd(&_zstr); |
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128 | if (rc != Z_OK) throw IOException(zError(rc)); |
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129 | } |
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130 | _pOstr = 0; |
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131 | } |
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132 | return 0; |
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133 | } |
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134 | |
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135 | |
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136 | int DeflatingStreamBuf::readFromDevice(char* buffer, std::streamsize length) |
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137 | { |
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138 | if (!_pIstr) return 0; |
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139 | if (_zstr.avail_in == 0 && !_eof) |
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140 | { |
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141 | int n = 0; |
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142 | if (_pIstr->good()) |
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143 | { |
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144 | _pIstr->read(_buffer, DEFLATE_BUFFER_SIZE); |
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145 | n = static_cast<int>(_pIstr->gcount()); |
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146 | } |
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147 | if (n > 0) |
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148 | { |
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149 | _zstr.next_in = (unsigned char*) _buffer; |
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150 | _zstr.avail_in = n; |
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151 | } |
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152 | else |
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153 | { |
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154 | _zstr.next_in = 0; |
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155 | _zstr.avail_in = 0; |
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156 | _eof = true; |
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157 | } |
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158 | } |
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159 | _zstr.next_out = (unsigned char*) buffer; |
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160 | _zstr.avail_out = static_cast<unsigned>(length); |
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161 | for (;;) |
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162 | { |
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163 | int rc = deflate(&_zstr, _eof ? Z_FINISH : Z_NO_FLUSH); |
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164 | if (_eof && rc == Z_STREAM_END) |
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165 | { |
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166 | rc = deflateEnd(&_zstr); |
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167 | if (rc != Z_OK) throw IOException(zError(rc)); |
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168 | _pIstr = 0; |
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169 | return static_cast<int>(length) - _zstr.avail_out; |
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170 | } |
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171 | if (rc != Z_OK) throw IOException(zError(rc)); |
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172 | if (_zstr.avail_out == 0) |
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173 | { |
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174 | return static_cast<int>(length); |
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175 | } |
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176 | if (_zstr.avail_in == 0) |
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177 | { |
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178 | int n = 0; |
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179 | if (_pIstr->good()) |
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180 | { |
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181 | _pIstr->read(_buffer, DEFLATE_BUFFER_SIZE); |
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182 | n = static_cast<int>(_pIstr->gcount()); |
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183 | } |
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184 | if (n > 0) |
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185 | { |
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186 | _zstr.next_in = (unsigned char*) _buffer; |
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187 | _zstr.avail_in = n; |
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188 | } |
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189 | else |
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190 | { |
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191 | _zstr.next_in = 0; |
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192 | _zstr.avail_in = 0; |
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193 | _eof = true; |
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194 | } |
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195 | } |
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196 | } |
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197 | } |
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198 | |
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199 | |
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200 | int DeflatingStreamBuf::writeToDevice(const char* buffer, std::streamsize length) |
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201 | { |
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202 | if (length == 0 || !_pOstr) return 0; |
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203 | |
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204 | _zstr.next_in = (unsigned char*) buffer; |
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205 | _zstr.avail_in = static_cast<unsigned>(length); |
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206 | _zstr.next_out = (unsigned char*) _buffer; |
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207 | _zstr.avail_out = DEFLATE_BUFFER_SIZE; |
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208 | for (;;) |
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209 | { |
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210 | int rc = deflate(&_zstr, Z_NO_FLUSH); |
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211 | if (rc != Z_OK) throw IOException(zError(rc)); |
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212 | if (_zstr.avail_out == 0) |
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213 | { |
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214 | _pOstr->write(_buffer, DEFLATE_BUFFER_SIZE); |
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215 | if (!_pOstr->good()) throw IOException(zError(rc)); |
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216 | _zstr.next_out = (unsigned char*) _buffer; |
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217 | _zstr.avail_out = DEFLATE_BUFFER_SIZE; |
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218 | } |
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219 | if (_zstr.avail_in == 0) |
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220 | { |
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221 | _pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out); |
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222 | if (!_pOstr->good()) throw IOException(zError(rc)); |
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223 | _zstr.next_out = (unsigned char*) _buffer; |
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224 | _zstr.avail_out = DEFLATE_BUFFER_SIZE; |
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225 | break; |
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226 | } |
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227 | } |
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228 | return static_cast<int>(length); |
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229 | } |
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230 | |
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231 | |
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232 | DeflatingIOS::DeflatingIOS(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level): |
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233 | _buf(ostr, type, level) |
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234 | { |
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235 | poco_ios_init(&_buf); |
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236 | } |
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237 | |
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238 | |
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239 | DeflatingIOS::DeflatingIOS(std::istream& istr, DeflatingStreamBuf::StreamType type, int level): |
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240 | _buf(istr, type, level) |
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241 | { |
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242 | poco_ios_init(&_buf); |
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243 | } |
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244 | |
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245 | |
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246 | DeflatingIOS::~DeflatingIOS() |
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247 | { |
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248 | } |
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249 | |
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250 | |
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251 | DeflatingStreamBuf* DeflatingIOS::rdbuf() |
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252 | { |
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253 | return &_buf; |
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254 | } |
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255 | |
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256 | |
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257 | DeflatingOutputStream::DeflatingOutputStream(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level): |
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258 | DeflatingIOS(ostr, type, level), |
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259 | std::ostream(&_buf) |
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260 | { |
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261 | } |
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262 | |
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263 | |
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264 | DeflatingOutputStream::~DeflatingOutputStream() |
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265 | { |
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266 | } |
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267 | |
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268 | |
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269 | int DeflatingOutputStream::close() |
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270 | { |
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271 | return _buf.close(); |
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272 | } |
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273 | |
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274 | |
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275 | DeflatingInputStream::DeflatingInputStream(std::istream& istr, DeflatingStreamBuf::StreamType type, int level): |
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276 | DeflatingIOS(istr, type, level), |
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277 | std::istream(&_buf) |
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278 | { |
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279 | } |
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280 | |
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281 | |
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282 | DeflatingInputStream::~DeflatingInputStream() |
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283 | { |
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284 | } |
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285 | |
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286 | |
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287 | } // namespace Poco |
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