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-rw-r--r--src/auths/xtextencode.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/auths/xtextencode.c b/src/auths/xtextencode.c
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+++ b/src/auths/xtextencode.c
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+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "../exim.h"
+
+
+/*************************************************
+* Encode byte-string in xtext *
+*************************************************/
+
+/* This function encodes a string of bytes, containing any values whatsoever,
+as "xtext", as defined in RFC 1891 and required by the SMTP AUTH extension (RFC
+2554).
+
+Arguments:
+ clear points to the clear text bytes
+ len the number of bytes to encode
+
+Returns: a pointer to the zero-terminated xtext string, which
+ is in working store
+*/
+
+uschar *
+auth_xtextencode(uschar *clear, int len)
+{
+uschar *code;
+uschar *p = US clear;
+uschar *pp;
+int c = len;
+int count = 1;
+register int x;
+
+/* We have to do a prepass to find out how many specials there are,
+in order to get the right amount of store. */
+
+while (c -- > 0)
+ count += ((x = *p++) < 33 || x > 127 || x == '+' || x == '=')? 3 : 1;
+
+pp = code = store_get(count, is_tainted(clear));
+
+p = US clear;
+c = len;
+while (c-- > 0)
+ if ((x = *p++) < 33 || x > 127 || x == '+' || x == '=')
+ pp += sprintf(CS pp, "+%.02x", x); /* There's always room */
+ else
+ *pp++ = x;
+
+*pp = 0;
+return code;
+}
+
+/* End of xtextencode.c */