NAME

       scan_base64url - decode base64url encoded data

SYNTAX

       #include <libowfat/textcode.h>

       size_t scan_base64url(const char *src,char *dest,size_t* destlen);

DESCRIPTION

       base64url  is a variant of base64 for use in URLs (standard base64 uses / and +, which can
       cause problems in URLs, so base64url uses - and _ instead; also base64url does not  use  =
       padding at the end).

       scan_base64url  decodes  base64url  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.

       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_base64url returns the number of bytes successfully scanned and processed from src.

EXAMPLES

       scan_base64url("Zm5vcmQ",buf,&i) -> return 7, i=5, buf="fnord"

SEE ALSO

       scan_base64(3), scan_xlong(3), scan_8long(3), fmt_ulong(3)

                                                                                scan_base64url(3)