src/freenet/captcha/alternatecaptcha1.cpp

   1 #include "../../../include/freenet/captcha/alternatecaptcha1.h"\r
   2 \r
   3 #include <cmath>\r
   4 #include <cstdlib>\r
   5 \r
   6 #ifdef ALTERNATE_CAPTCHA\r
   7 \r
   8 AlternateCaptcha1::AlternateCaptcha1()\r
   9 {\r
  10         AlternateCaptchaFonts fonts;\r
  11         m_fonts=fonts.Fonts();\r
  12 }\r
  13 \r
  14 void AlternateCaptcha1::Generate()\r
  15 {\r
  16         if(m_fonts.size()==0)\r
  17         {\r
  18                 return;\r
  19         }\r
  20 \r
  21         std::string puzzlestring=GenerateRandomString(5);\r
  22         FreeImage::Bitmap tempchar(50,50,32);\r
  23         tempchar.SetTransparent();\r
  24         FreeImage::Bitmap bmp(110,50,32);\r
  25         bmp.SetTransparent();\r
  26 \r
  27         m_solution.clear();\r
  28         m_puzzle.clear();\r
  29 \r
  30         // draw the text\r
  31         if(m_fonts.size()>0)\r
  32         {\r
  33                 for(int i=0; i<puzzlestring.size(); i++)\r
  34                 {\r
  35                         RGBQUAD black;\r
  36                         black.rgbRed=0;\r
  37                         black.rgbGreen=0;\r
  38                         black.rgbBlue=0;\r
  39                         int xoffset=(i*20)-(5+(rand()%5));\r
  40                         int yoffset=(rand()%20)-10;\r
  41                         int fontnum=rand()%m_fonts.size();\r
  42                         FreeImage::Bitmap charbmp=m_fonts[fontnum].Char(puzzlestring[i]);\r
  43 \r
  44                         tempchar.SetTransparent();\r
  45                         tempchar.ClearTransparent();\r
  46                         tempchar.BlitTrans(charbmp,25-(charbmp.Width()/2),25-(charbmp.Height()/2),0,0,charbmp.Width(),charbmp.Height());\r
  47                         tempchar.Rotate((rand()%60)-30,0,0,25,25);\r
  48 \r
  49                         bmp.BlitTrans(tempchar,xoffset,yoffset,0,0,50,50);\r
  50                 }\r
  51         }\r
  52 \r
  53         //place some random lines\r
  54         RGBQUAD white;\r
  55         white.rgbRed=255;\r
  56         white.rgbGreen=255;\r
  57         white.rgbBlue=255;\r
  58         white.rgbReserved=255;\r
  59         int numlines=(rand()%5)+5;\r
  60         for(int i=0; i<numlines; i++)\r
  61         {\r
  62                 // draw 4 short lines very close to each other\r
  63                 int x1[4];\r
  64                 int y1[4];\r
  65                 int x2[4];\r
  66                 int y2[4];\r
  67 \r
  68                 x1[0]=rand()%bmp.Width();\r
  69                 y1[0]=rand()%bmp.Height();\r
  70                 x2[0]=x1[0]+(rand()%40)-20;\r
  71                 y2[0]=y1[0]+(rand()%40)-20;\r
  72 \r
  73                 for(int i=1; i<4; i++)\r
  74                 {\r
  75                         x1[i]=x1[i-1]+rand()%3-1;\r
  76                         y1[i]=y1[i-1]+rand()%3-1;\r
  77                         x2[i]=x2[i-1]+rand()%3-1;\r
  78                         y2[i]=y2[i-1]+rand()%3-1;\r
  79                 }\r
  80 \r
  81                 for(int i=0; i<4; i++)\r
  82                 {\r
  83                         bmp.Line(x1[i],y1[i],x2[i],y2[i],white);\r
  84                 }\r
  85         }\r
  86 \r
  87         // make output a little wavy\r
  88         int offset=rand()%10000;\r
  89         for(int y=0; y<bmp.Height(); y++)\r
  90         {\r
  91                 double shift=sin((double)(y+offset)/3.0);\r
  92                 bmp.HorizontalOffset(y,shift);\r
  93         }\r
  94 \r
  95         m_solution.clear();\r
  96         m_solution.insert(m_solution.end(),puzzlestring.begin(),puzzlestring.end());\r
  97         m_puzzle.clear();\r
  98         bmp.SaveToMemory("bmp",m_puzzle);\r
  99 \r
 100 }\r
 101 \r
 102 const std::string AlternateCaptcha1::GenerateRandomString(const int len)\r
 103 {\r
 104         // no l,1 O,0 because they look too much alike\r
 105         static std::string chars="abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ23456789@#";\r
 106         std::string temp="";\r
 107         for(int i=0; i<len; i++)\r
 108         {\r
 109                 temp+=chars[rand()%chars.size()];\r
 110         }\r
 111         return temp;\r
 112 }\r
 113 \r
 114 const bool AlternateCaptcha1::GetPuzzle(std::vector<unsigned char> &puzzle)\r
 115 {\r
 116         puzzle=m_puzzle;\r
 117         return true;\r
 118 }\r
 119 \r
 120 const bool AlternateCaptcha1::GetSolution(std::vector<unsigned char> &solution)\r
 121 {\r
 122         solution=m_solution;\r
 123         return true;\r
 124 }\r
 125 \r
 126 #endif  // ALTERNATE_CAPTCHA\r