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/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
/* Copyright (c) The Exim Maintainers 2022 */
/* 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, 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 */
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