projects / exim.git / blame
| Commit | Line | Data |
|---|---|---|
| 0756eb3c PH |
1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * | |
| 3 | *************************************************/ | |
| 4 | ||
| 0a49a7a4 | 5 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
| 0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | ||
| 8 | #include "../exim.h" | |
| 9 | ||
| 10 | ||
| 11 | /************************************************* | |
| 12 | * Encode byte-string in xtext * | |
| 13 | *************************************************/ | |
| 14 | ||
| 15 | /* This function encodes a string of bytes, containing any values whatsoever, | |
| 16 | as "xtext", as defined in RFC 1891 and required by the SMTP AUTH extension (RFC | |
| 17 | 2554). | |
| 18 | ||
| 19 | Arguments: | |
| 20 | clear points to the clear text bytes | |
| 21 | len the number of bytes to encode | |
| 22 | ||
| 23 | Returns: a pointer to the zero-terminated xtext string, which | |
| 24 | is in working store | |
| 25 | */ | |
| 26 | ||
| 27 | uschar * | |
| 28 | auth_xtextencode(uschar *clear, int len) | |
| 29 | { | |
| 30 | uschar *code; | |
| 31 | uschar *p = (uschar *)clear; | |
| 32 | uschar *pp; | |
| 33 | int c = len; | |
| 34 | int count = 1; | |
| 35 | register int x; | |
| 36 | ||
| 37 | /* We have to do a prepass to find out how many specials there are, | |
| 38 | in order to get the right amount of store. */ | |
| 39 | ||
| 40 | while (c -- > 0) | |
| 41 | count += ((x = *p++) < 33 || x > 127 || x == '+' || x == '=')? 3 : 1; | |
| 42 | ||
| 43 | pp = code = store_get(count); | |
| 44 | ||
| 45 | p = (uschar *)clear; | |
| 46 | c = len; | |
| 47 | while (c-- > 0) | |
| 48 | { | |
| 49 | if ((x = *p++) < 33 || x > 127 || x == '+' || x == '=') | |
| 50 | { | |
| 51 | sprintf(CS pp, "+%.02x", x); /* There's always room */ | |
| 52 | pp += 3; | |
| 53 | } | |
| 54 | else *pp++ = x; | |
| 55 | } | |
| 56 | ||
| 57 | *pp = 0; | |
| 58 | return code; | |
| 59 | } | |
| 60 | ||
| 61 | /* End of xtextencode.c */ |