1 #include "../../../include/freenet/captcha/simplecaptcha.h"
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2 #include "../../../include/freenet/captcha/easybmp/EasyBMP.h"
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3 #include "../../../include/freenet/captcha/easybmp/EasyBMP_Font.h"
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4 #include "../../../include/freenet/captcha/easybmp/EasyBMP_Geometry.h"
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6 #include <Poco/TemporaryFile.h>
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14 void SimpleCaptcha::Generate()
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19 RGBApixel lettercols[5];
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20 std::string puzzlestring;
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21 std::string tempfilename="";
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23 tempfilename=Poco::TemporaryFile::tempName();
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25 puzzlestring=GenerateRandomString(5);
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27 m_solution.insert(m_solution.begin(),puzzlestring.begin(),puzzlestring.end());
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29 bmp.SetSize(bmpwidth,bmpheight);
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31 // first draw some random lines around the bitmap
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32 int numlines=(rand()%10)+10;
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33 for(int i=0; i<numlines; i++)
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36 int x1=rand()%bmpwidth;
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37 int y1=rand()%bmpheight;
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38 int x2=rand()%bmpwidth;
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39 int y2=rand()%bmpwidth;
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40 // keep the colors light
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41 pixel.Red=100+(rand()%150);
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42 pixel.Green=100+(rand()%150);
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43 pixel.Blue=100+(rand()%150);
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44 DrawAALine(bmp,x1,y1,x2,y2,pixel);
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47 // draw some random arcs
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48 int numarcs=(rand()%10)+10;
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49 for(int i=0; i<numarcs; i++)
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52 int x1=rand()%bmpwidth;
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53 int y1=rand()%bmpwidth;
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54 int radius=rand()%(bmpheight/2);
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55 double startangle=(double)(rand()%360)*(3.14159/180);
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56 double endangle=(double)(rand()%360)*(3.14159/180);
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57 pixel.Red=100+(rand()%150);
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58 pixel.Green=100+(rand()%150);
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59 pixel.Blue=100+(rand()%150);
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60 DrawArc(bmp,x1,y1,radius,startangle,endangle,pixel);
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63 for(int i=0; i<5; i++)
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65 // keep the colors dark
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66 lettercols[i].Red=(rand()%150);
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67 lettercols[i].Green=(rand()%150);
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68 lettercols[i].Blue=(rand()%150);
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69 // draw a line with the letter color
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70 DrawAALine(bmp,rand()%bmpwidth,rand()%bmpheight,rand()%bmpwidth,rand()%bmpheight,lettercols[i]);
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73 // print puzzle onto bitmap
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74 for(int i=0; i<5; i++)
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76 PrintLetter(bmp,puzzlestring[i],5+(i*20)+(rand()%11)-5,10+(rand()%10),20,lettercols[i]);
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79 /* TOO dificult to solve with this
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80 // skew image left/right
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82 for(int yy=0; yy<bmpheight; yy++)
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85 skew=skew+(double)((rand()%11)-5)/20.0;
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87 for(xx=0; xx<skew; xx++)
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92 bmp.SetPixel(xx,yy,pixel);
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96 for(xx=0; xx<bmpwidth+skew; xx++)
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98 pixel=bmp.GetPixel(xx-skew,yy);
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99 bmp.SetPixel(xx,yy,pixel);
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104 for(xx=bmpwidth-1; xx>skew; xx--)
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106 pixel=bmp.GetPixel(xx-skew,yy);
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107 bmp.SetPixel(xx,yy,pixel);
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110 for(xx=bmpwidth+skew; xx<bmpwidth; xx++)
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115 bmp.SetPixel(xx,yy,pixel);
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120 // generate noise for each pixel
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121 for(int yy=0; yy<bmpheight; yy++)
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123 for(int xx=0; xx<bmpwidth; xx++)
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125 RGBApixel pixel=bmp.GetPixel(xx,yy);
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126 int tempred=pixel.Red+(rand()%21)-10;
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127 int tempgreen=pixel.Green+(rand()%21)-10;
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128 int tempblue=pixel.Blue+(rand()%21)-10;
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130 tempred < 0 ? tempred=0 : false;
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131 tempred > 255 ? tempred=255 : false;
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132 tempgreen < 0 ? tempgreen=0 : false;
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133 tempgreen > 255 ? tempgreen=255 : false;
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134 tempblue < 0 ? tempblue=0 : false;
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135 tempblue > 255 ? tempblue=255 : false;
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138 pixel.Green=tempgreen;
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139 pixel.Blue=tempblue;
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141 bmp.SetPixel(xx,yy,pixel);
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145 bmp.WriteToFile(tempfilename.c_str());
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146 ReadPuzzleData(tempfilename);
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147 unlink(tempfilename.c_str());
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150 const std::string SimpleCaptcha::GenerateRandomString(const int len)
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152 // no l,1 O,0 because they look too much alike
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153 static std::string chars="abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ23456789";
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154 std::string temp="";
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155 for(int i=0; i<len; i++)
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157 temp+=chars[rand()%chars.size()];
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162 const bool SimpleCaptcha::GetPuzzle(std::vector<unsigned char> &puzzle)
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168 const bool SimpleCaptcha::GetSolution(std::vector<unsigned char> &solution)
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170 solution=m_solution;
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174 void SimpleCaptcha::ReadPuzzleData(const std::string &filename)
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177 FILE *infile=fopen(filename.c_str(),"rb");
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180 fseek(infile,0,SEEK_END);
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181 filelen=ftell(infile);
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182 fseek(infile,0,SEEK_SET);
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183 m_puzzle.resize(filelen);
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184 fread(&m_puzzle[0],1,filelen,infile);
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