NAME

       scan_base64 - decode base64 encoded data

SYNTAX

       #include <libowfat/textcode.h>

       size_t scan_base64(const char *src,char *dest,size_t* destlen);

DESCRIPTION

       scan_base64  decodes  base64  encoded  data  from  src  into  dest.   It will stop when it
       encounters any non-valid input characters.  It will then write the number of decoded bytes
       in dest into *destlen, and return the number of bytes decoded from src.

       Note  that  real  world  base64  encoded data is sometimes permitted to contain whitespace
       characters or new lines. This function will not allow those and return  the  decoded  data
       until then.

       Many  base64  variants  demand  padding in the last block. Some don't. This implementation
       will consume padding if it is there, but will not complain if it is not.

       dest can be NULL. destlen can be NULL. dest can be src.

RETURN VALUE

       scan_base64 returns the number of bytes successfully scanned and processed from src.

EXAMPLES

       scan_base64("Zm5vcmQ=",buf,&i) -> return 8, i=5, buf="fnord"

SEE ALSO

       scan_base64url(3), scan_xlong(3), scan_8long(3), fmt_ulong(3)

                                                                                   scan_base64(3)