+/*
+ Copyright (c) 2006 Joey Schulze <joey@infodrom.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "charset.h"
+
+/*
+ * Index_hex and Index_64 imported from Mutt:handler.c
+ * decode_quotedprintable() and decode_base64() as well
+ */
+int Index_hex[128] = {
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1, -1,-1,-1,-1,
+ -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
+};
+
+int Index_64[128] = {
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+ 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
+ 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
+ -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+ 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+};
+#define hexval(c) Index_hex[(unsigned int)(c)]
+#define base64val(c) Index_64[(unsigned int)(c)]
+
+
+/*
+ * Decode a string from quoted printable
+ */
+char *decode_quotedprintable(char *buf)
+{
+ char *inp, *outp;
+ char *endp;
+
+ endp = buf+strlen(buf);
+
+ for (inp = outp = buf; inp < endp; inp++) {
+ if (*inp == '_')
+ *(outp++) = ' ';
+ else if (*inp == '=' && inp+2 < endp &&
+ (!(*(inp+1) & ~127) && hexval(*(inp+1)) != -1) &&
+ (!(*(inp+2) & ~127) && hexval(*(inp+2)) != -1)) {
+ *(outp++) = (hexval(*(inp+1)) << 4) | hexval(*(inp+2));
+ inp += 2;
+ } else
+ *(outp++) = *inp;
+ }
+ *outp = '\0';
+
+ return buf;
+}
+
+/*
+ * Decode a string from base43
+ */
+char *decode_base64(char *buf)
+{
+ char *inp, *outp;
+ char *endp;
+ int c, b = 0, k = 0;
+
+ endp = buf+strlen(buf);
+
+ for (inp = outp = buf; inp < endp; inp++) {
+ if (*inp == '=')
+ break;
+ if ((*inp & ~127) || (c = base64val(*inp)) == -1)
+ continue;
+ if (k + 6 >= 8)
+ {
+ k -= 2;
+ *(outp++) = b | (c >> k);
+ b = c << (8 - k);
+ }
+ else
+ {
+ b |= c << (k + 2);
+ k += 6;
+ }
+ *outp = '\0';
+ }
+
+ return buf;
+}
+
+/*
+ * converts a header line into the current character set if required
+ */
+char *convert_header(char *buf)
+{
+ char *charset;
+ int encoding;
+ char *inp, *outp, *encstart, *wordp, *encp, *endp;
+ char *decode;
+ size_t size;
+
+ endp = buf+strlen(buf);
+ inp = outp = buf;
+
+ while ((encstart = strstr (inp, "=?"))) {
+ if (inp == outp)
+ outp = encstart;
+ else {
+ memmove (outp, inp, encstart-inp-1);
+ outp += encstart-inp-1;
+ }
+ charset = encstart+2;
+
+ if ((encp = strchr (charset, '?')) == NULL) {
+ memmove (outp, inp, strlen(inp)+1);
+ break;
+ }
+
+ *encp = '\0';
+
+ if ((encp + 3 >= endp) || !strchr ("BbQq", *encp) || (*(encp+2) != '?')) {
+ memmove (outp, inp, strlen(inp)+1);
+ break;
+ }
+
+ encoding = toupper(*(encp+1));
+
+ inp = encp + 3;
+
+ if ((wordp = strstr (inp, "?=")) == NULL) {
+ memmove (outp, encstart, strlen(encstart)+1);
+ strcat (outp, "?");
+ encstart += strlen(encstart)+1;
+ memmove (outp, encstart, strlen(encstart)+1);
+ break;
+ }
+
+ *wordp = '\0';
+ wordp += 2;
+
+ switch (encoding) {
+ case 'B':
+ decode = decode_base64 (inp);
+ break;
+ case 'Q':
+ decode = decode_quotedprintable (inp);
+ break;
+ default:
+ decode = inp;
+ break;
+ }
+
+ size = wordp - outp -1;
+ decode = convert_word (charset, decode, outp, size);
+
+ memmove (outp, decode, strlen(decode));
+ outp += strlen(decode);
+
+ inp = wordp;
+ }
+
+ if (inp != outp)
+ memmove (outp, inp, strlen(inp)+1);
+
+ return buf;
+}
+
+
+/*
+ * Needs to be called with LANG=de_DE.ISO-8859-1
+
+#include <stdio.h>
+
+void test_rfc2047()
+{
+ char *qp;
+ char *b64;
+ char *subject;
+
+ set_charset();
+
+ qp = strdup ("f=FCr");
+ printf ("\t%s -> ", qp);
+ b64 = decode_quotedprintable (qp);
+ printf ("%s\n", qp);
+ if (!strcmp (qp, "für"))
+ printf ("rfc2047.c: decode_quotedprintable() passed\n");
+ else
+ printf ("rfc2047.c: decode_quotedprintable() failed\n");
+ free (qp);
+
+ qp = strdup ("f=FCr_Umlaute_=EFm_Sub");
+ printf ("\t%s -> ", qp);
+ b64 = decode_quotedprintable (qp);
+ printf ("%s\n", qp);
+ if (!strcmp (qp, "für Umlaute ïm Sub"))
+ printf ("rfc2047.c: decode_quotedprintable() passed\n");
+ else
+ printf ("rfc2047.c: decode_quotedprintable() failed\n");
+ free (qp);
+
+ b64 = strdup ("ZvxyINxtbOT8dOs=");
+ printf ("\t%s -> ", b64);
+ b64 = decode_base64 (b64);
+ printf ("%s\n", b64);
+ if (!strcmp (b64, "für Ümläütë"))
+ printf ("rfc2047.c: decode_base64() passed\n");
+ else
+ printf ("rfc2047.c: decode_base64() failed\n");
+ free (b64);
+
+ subject = strdup ("Vorschlag =?ISO-8859-1?Q?f=FCr?= ein Eintrittskonzept");
+ printf ("\t%s\n", subject);
+ subject = convert_header (subject);
+ printf ("\t%s\n", subject);
+ if (!strcmp (subject, "Vorschlag für ein Eintrittskonzept"))
+ printf ("rfc2047.c: convert_header() passed\n");
+ else
+ printf ("rfc2047.c: convert_header() failed\n");
+ free (subject);
+
+ subject = strdup ("=?utf-8?q?Google=3A_Chat_f=C3=BCr_die_Ewigkeit?=");
+ printf ("\t%s\n", subject);
+ subject = convert_header (subject);
+ printf ("\t%s\n", subject);
+ if (!strcmp (subject, "Google: Chat für die Ewigkeit"))
+ printf ("rfc2047.c: convert_header() passed\n");
+ else
+ printf ("rfc2047.c: convert_header() failed\n");
+ free (subject);
+
+ subject = strdup ("=?iso-8859-1?B?ZvxyINxtbOT8dOs=?= testen");
+ printf ("\t%s\n", subject);
+ subject = convert_header (subject);
+ printf ("\t%s\n", subject);
+ if (!strcmp (subject, "für Ümläütë testen"))
+ printf ("rfc2047.c: convert_header() passed\n");
+ else
+ printf ("rfc2047.c: convert_header() failed\n");
+ free (subject);
+
+}
+*/
projects / infodrom / newmail / commitdiff