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[exim.git] / src / src / auths / xtextencode.c

diff --git a/src/src/auths/xtextencode.c b/src/src/auths/xtextencode.c
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+/* $Cambridge: exim/src/src/auths/xtextencode.c,v 1.1 2004/10/07 13:10:01 ph10 Exp $ */
+
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* 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 = (uschar *)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);
+
+p = (uschar *)clear;
+c = len;
+while (c-- > 0)
+  {
+  if ((x = *p++) < 33 || x > 127 || x == '+' || x == '=')
+    {
+    sprintf(CS pp, "+%.02x", x);   /* There's always room */
+    pp += 3;
+    }
+  else *pp++ = x;
+  }
+
+*pp = 0;
+return code;
+}
+
+/* End of xtextencode.c */