ref: bae3ac29fc39bc36329abf1823004c0d79b2f6f0
dir: /sys/src/ape/lib/openssl/demos/eay/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);
}