Base 64 decode using BIO_f_base64 and BIO chain

[k b]

Hi,
I'm trying to read a base64 encoded msg from an in memory buffer and decode 
it (and possible write to a file or to mem)
I can't figure out what's wrong with the code snippet below.
From what I have read in the openssl book and other docs, looks like this is 
how it should be done (see code snippet below).
The problem is BIO_read(b64, msg, 512) always retuns zero. but if i do 
BIO_read(bio, msg, 512)
everything works. Which tells me that the b64 isn't working or hasn't been 
configured/attached to bio correctly.
I want b64----bio.  isn't this the way to set the chain correctly 
BIO_push(b64, bio);

Can someone please point out where i'm going wrong.
Thanks in advance for you comments.

// reads b64 encoded msg (pReadBuffer) and writes to pWriiteFile.
void decode(char *pReadBuffer, int pLength, char *pWriteFile)
{
   char msg[512];
   int readbytes = -1;

   printf("buffer write file %s\n",  pWriteFile);

  // the decode msg is written to this bio
   BIO *fileWrBIO = BIO_new_file(pWriteFile, "w");

   BIO *b64 = BIO_new(BIO_f_base64());
   BIO *bio = BIO_new_mem_buf(pReadBuffer, pLength);
   BIO_push(b64, bio);

   while ((readbytes = BIO_read(b64, msg, 512)) > 0)
   {
       BIO_write(fileWrBIO, msg, readbytes);
       BIO_flush(fileWrBIO);
       memset(msg, 0x00, sizeof(msg));
       printf("while bytes read %d\n", readbytes);
   }
   printf("bytes read %d\n", readbytes);
   BIO_free_all(bio);
   BIO_free_all(fileWrBIO);
}


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