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base64.c

/* This is a simple example of using the base64 BIO to a memory BIO and then
 * getting the data.
 */
#include <stdio.h>
#include <openssl/bio.h>
#include <openssl/evp.h>

main()
      {
      int i;
      BIO *mbio,*b64bio,*bio;
      char buf[512];
      char *p;

      mbio=BIO_new(BIO_s_mem());
      b64bio=BIO_new(BIO_f_base64());

      bio=BIO_push(b64bio,mbio);
      /* We now have bio pointing at b64->mem, the base64 bio encodes on
       * write and decodes on read */

      for (;;)
            {
            i=fread(buf,1,512,stdin);
            if (i <= 0) break;
            BIO_write(bio,buf,i);
            }
      /* We need to 'flush' things to push out the encoding of the
       * last few bytes.  There is special encoding if it is not a
       * multiple of 3
       */
      BIO_flush(bio);

      printf("We have %d bytes available\n",BIO_pending(mbio));

      /* We will now get a pointer to the data and the number of elements. */
      /* hmm... this one was not defined by a macro in bio.h, it will be for
       * 0.9.1.  The other option is too just read from the memory bio.
       */
      i=(int)BIO_ctrl(mbio,BIO_CTRL_INFO,0,(char *)&p);

      printf("%d\n",i);
      fwrite("---\n",1,4,stdout);
      fwrite(p,1,i,stdout);
      fwrite("---\n",1,4,stdout);

      /* This call will walk the chain freeing all the BIOs */
      BIO_free_all(bio);
      }

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