version depends on gd and creates a traditional captcha

1 files changed, 51 insertions, 0 deletions

diff --git a/captcha.c b/captcha.c
new file mode 100644
index 0000000..18f7d99
--- /dev/null
+++ b/captcha.c
@@ -0,0 +1,51 @@
+#include "captcha.h"
+
+int captcha_print(char* text)
+{
+  File* file = file_open("code.png");
+
+  gdImagePtr im = gdImageCreateFromPngPtr(file->size, file->data);
+  gdImageColorTransparent(im, gdImageColorAllocate(im, 255, 255, 255));
+  
+  char  text_width = strlen(text);
+  float letter_width = ((float) gdImageSX(im) / 26.00);
+
+  int image_width = letter_width * text_width;
+  int image_height = gdImageSY(im);
+
+  gdImagePtr image = gdImageCreateTrueColor(image_width, image_height);
+  gdImageColorTransparent(image, gdImageColorAllocate(image, 0, 0, 0));
+
+  srand(time(NULL) * (*text));
+  int i;
+  for(i=0; i<=10; i++)
+  {
+    int x1 = ((double) rand() / RAND_MAX) * image_width;
+    int y1 = ((double) rand() / RAND_MAX) * image_height;
+    gdImageFilledArc(image, x1, y1, x1 + 10, y1 + 10, ((double) rand() / RAND_MAX) * 360, ((double) rand() / RAND_MAX) * 360, gdImageColorAllocate(image, 100 + (rand() * 155), 150 + (rand() * 105), 150 + (rand() * 105)), gdEdged);
+  }
+
+  int pos;
+  for(pos=0; text[pos]!='\0'; pos++)
+  {
+    //printf("[pos:%d] %d\n", pos, (text[pos] - 65) );
+    gdImageCopyMerge(image, im, 
+        letter_width * pos, 0, 
+        ((text[pos] - 65) * letter_width), 0, 
+        letter_width, gdImageSY(image), 50);
+  }
+
+  puts("content-type: image/jpeg\n");
+  gdImageJpeg(image, stdout, 80);
+
+  gdImageDestroy(image);
+  gdImageDestroy(im);
+
+  file_close(file);
+  return EXIT_SUCCESS;
+}
+
+int main()
+{
+  return captcha_print("HALLELUJA");
+}