base64.c

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/* 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);
    }