IMAP: fix base64 length calc. for AUTH=EXTERNAL

to make code more correct or readable; to64frombits does not overflow its buffer

1 files changed, 5 insertions, 0 deletions

diff --git a/base64.c b/base64.c
index 9af84a48..b1351422 100644
--- a/base64.c
+++ b/base64.c
@@ -27,6 +27,11 @@ static const char base64val[] = {
 };
 #define DECODE64(c)  (isascii((unsigned char)(c)) ? base64val[c] : BAD)
 
+unsigned len64frombits(unsigned inlen)
+{
+	return (inlen + 2)/3*4;
+}
+
 int to64frombits(char *out, const void *in_, int inlen, size_t outlen)
 /* raw bytes in quasi-big-endian order to base 64 string (NUL-terminated) */
 {