demos/eay/base64.c

   1 /* This is a simple example of using the base64 BIO to a memory BIO and then
   2  * getting the data.
   3  */
   4 #include <stdio.h>
   5 #include "bio.h"
   6 #include "evp.h"
   7
   8 main()
   9         {
  10         int i;
  11         BIO *mbio,*b64bio,*bio;
  12         char buf[512];
  13         char *p;
  14
  15         mbio=BIO_new(BIO_s_mem());
  16         b64bio=BIO_new(BIO_f_base64());
  17
  18         bio=BIO_push(b64bio,mbio);
  19         /* We now have bio pointing at b64->mem, the base64 bio encodes on
  20          * write and decodes on read */
  21
  22         for (;;)
  23                 {
  24                 i=fread(buf,1,512,stdin);
  25                 if (i <= 0) break;
  26                 BIO_write(bio,buf,i);
  27                 }
  28         /* We need to 'flush' things to push out the encoding of the
  29          * last few bytes.  There is special encoding if it is not a
  30          * multiple of 3
  31          */
  32         BIO_flush(bio);
  33
  34         printf("We have %d bytes available\n",BIO_pending(mbio));
  35
  36         /* We will now get a pointer to the data and the number of elements. */
  37         /* hmm... this one was not defined by a macro in bio.h, it will be for
  38          * 0.9.1.  The other option is too just read from the memory bio.
  39          */
  40         i=(int)BIO_ctrl(mbio,BIO_CTRL_INFO,0,(char *)&p);
  41
  42         printf("%d\n",i);
  43         fwrite("---\n",1,4,stdout);
  44         fwrite(p,1,i,stdout);
  45         fwrite("---\n",1,4,stdout);
  46
  47         /* This call will walk the chain freeing all the BIOs */
  48         BIO_free_all(bio);
  49         }