2 ** mhbuild.c -- expand/translate MIME composition files
4 ** This code is Copyright (c) 2002, by the authors of nmh. See the
5 ** COPYRIGHT file in the root directory of the nmh distribution for
6 ** complete copyright information.
10 ** This code was originally part of mhn.c. I split it into
11 ** a separate program (mhbuild.c). But the code still has some of
12 ** the mhn.c code in it. This program needs additional
13 ** streamlining and removal of unneeded code.
18 #include <h/signals.h>
23 #include <h/mhparse.h>
26 #ifdef HAVE_SYS_TIME_H
27 # include <sys/time.h>
31 static struct swit switches[] = {
47 ** Directory to place tmp files. This must
48 ** be set before these routines are called.
54 static char prefix[] = "----- =_aaaaaaaaaa";
62 int make_intermediates(char *);
63 void content_error(char *, CT, char *, ...);
66 void free_content(CT);
68 void free_encoding(CT, int);
73 static int init_decoded_content(CT);
74 static char *fgetstr(char *, int, FILE *);
75 static int user_content(FILE *, char *, char *, CT *);
76 static void set_id(CT, int);
77 static int compose_content(CT);
78 static int scan_content(CT);
79 static int build_headers(CT);
80 static CT build_mime(char *);
89 static char infile[BUFSIZ];
90 static int unlink_infile = 0;
92 static char outfile[BUFSIZ];
93 static int unlink_outfile = 0;
95 static void unlink_done(int) NORETURN;
98 int output_message(CT, char *);
99 int output_message_fp(CT, FILE *, char*);
102 void set_endian(void);
105 void free_content(CT);
109 main(int argc, char **argv)
111 char *cp, buf[BUFSIZ];
112 char buffer[BUFSIZ], *compfile = NULL;
113 char **argp, **arguments;
121 setlocale(LC_ALL, "");
123 invo_name = mhbasename(argv[0]);
125 /* read user profile/context */
128 arguments = getarguments(invo_name, argc, argv, 1);
131 while ((cp = *argp++)) {
132 if (cp[0] == '-' && cp[1] == '\0') {
134 adios(NULL, "cannot specify both standard input and a file");
137 verbosw = 0; /* turn off -verbose listings */
141 switch (smatch(++cp, switches)) {
143 ambigsw(cp, switches);
146 adios(NULL, "-%s unknown", cp);
149 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
150 print_help(buf, switches, 1);
153 print_version(invo_name);
168 adios(NULL, "only one composition file allowed");
176 ** Check if we've specified an additional profile
178 if ((cp = getenv("MHBUILD"))) {
179 if ((fp = fopen(cp, "r"))) {
180 readconfig((struct node **) 0, fp, cp, 0);
183 admonish("", "unable to read $MHBUILD profile (%s)",
189 ** Read the standard profile setup
191 if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
192 readconfig((struct node **) 0, fp, cp, 0);
197 ** Check for storage directory. If defined, we
198 ** will store temporary files there. Else we
199 ** store them in standard nmh directory.
201 if ((cp = context_find(nmhstorage)) && *cp)
202 tmp = concat(cp, "/", invo_name, NULL);
204 tmp = getcpy(toabsdir(invo_name));
206 /* Check if we have a file to process */
208 adios(NULL, "need to specify a %s composition file",
212 ** Process the composition file from standard input.
214 if (compfile[0] == '-' && compfile[1] == '\0') {
215 /* copy standard input to temporary file */
216 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
218 while (fgets(buffer, BUFSIZ, stdin))
223 /* build the content structures for MIME message */
224 ct = build_mime(infile);
228 /* output MIME message to this temporary file */
229 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
233 /* output the message */
234 output_message_fp(ct, fp_out, outfile);
237 /* output the temp file to standard output */
238 if ((fp = fopen(outfile, "r")) == NULL)
239 adios(outfile, "unable to open");
240 while (fgets(buffer, BUFSIZ, fp))
241 fputs(buffer, stdout);
255 ** Process the composition file from a file.
258 /* build the content structures for MIME message */
259 ct = build_mime(compfile);
263 /* output MIME message to this temporary file */
264 strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
268 /* output the message */
269 output_message_fp(ct, fp_out, outfile);
272 /* Rename composition draft */
273 snprintf(buffer, sizeof(buffer), "%s.orig", m_backup(compfile));
274 if (rename(compfile, buffer) == NOTOK) {
275 adios(compfile, "unable to rename comp draft %s to", buffer);
278 /* Rename output file to take its place */
279 if (rename(outfile, compfile) == NOTOK) {
280 advise(outfile, "unable to rename output %s to", compfile);
281 rename(buffer, compfile);
293 unlink_done(int status)
296 ** Check if we need to remove stray temporary files.
307 ** Main routine for translating composition file
308 ** into valid MIME message. It translates the draft
309 ** into a content structure (actually a tree of content
310 ** structures). This message then can be manipulated
311 ** in various ways, including being output via
315 build_mime(char *infile)
318 char buf[BUFSIZ], name[NAMESZ];
327 /* open the composition draft */
328 if ((in = fopen(infile, "r")) == NULL)
329 adios(infile, "unable to open for reading");
332 ** Allocate space for primary (outside) content
334 if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
335 adios(NULL, "out of memory");
338 ** Allocate structure for handling decoded content
339 ** for this part. We don't really need this, but
340 ** allocate it to remain consistent.
342 init_decoded_content(ct);
345 ** Parse some of the header fields in the composition
346 ** draft into the linked list of header fields for
347 ** the new MIME message.
349 for (compnum = 1, state = FLD;;) {
350 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
356 /* abort if draft has Mime-Version header field */
357 if (!mh_strcasecmp(name, VRSN_FIELD))
358 adios(NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
361 ** abort if draft has Content-Transfer-Encoding
364 if (!mh_strcasecmp(name, ENCODING_FIELD))
365 adios(NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
367 /* ignore any Content-Type fields in the header */
368 if (!mh_strcasecmp(name, TYPE_FIELD)) {
369 while (state == FLDPLUS)
370 state = m_getfld(state, name, buf,
375 /* get copies of the buffers */
379 /* if necessary, get rest of field */
380 while (state == FLDPLUS) {
381 state = m_getfld(state, name, buf,
383 vp = add(buf, vp); /* add to prev value */
386 /* Now add the header data to the list */
387 add_header(ct, np, vp);
390 /* if this wasn't the last hdr field, then continue */
396 adios(NULL, "draft has empty body -- no directives!");
401 fseek(in, (long) (-strlen(buf)), SEEK_CUR);
406 adios(NULL, "message format error in component #%d",
410 adios(NULL, "getfld() returned %d", state);
416 ** Now add the MIME-Version header field
417 ** to the list of header fields.
419 np = getcpy(VRSN_FIELD);
420 vp = concat(" ", VRSN_VALUE, "\n", NULL);
421 add_header(ct, np, vp);
424 ** We initally assume we will find multiple contents in the
425 ** draft. So create a multipart/mixed content to hold everything.
426 ** We can remove this later, if it is not needed.
428 if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK)
430 ct->c_type = CT_MULTIPART;
431 ct->c_subtype = MULTI_MIXED;
432 ct->c_file = getcpy(infile);
434 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
435 adios(NULL, "out of memory");
436 ct->c_ctparams = (void *) m;
440 ** read and parse the composition file
441 ** and the directives it contains.
443 while (fgetstr(buf, sizeof(buf) - 1, in)) {
447 if (user_content(in, infile, buf, &p) == DONE) {
448 admonish(NULL, "ignoring spurious #end");
454 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
455 adios(NULL, "out of memory");
462 ** close the composition draft since
463 ** it's not needed any longer.
467 /* check if any contents were found */
469 adios(NULL, "no content directives found");
472 ** If only one content was found, then remove and
473 ** free the outer multipart content.
475 if (!m->mp_parts->mp_next) {
478 p = m->mp_parts->mp_part;
479 m->mp_parts->mp_part = NULL;
481 /* move header fields */
482 p->c_first_hf = ct->c_first_hf;
483 p->c_last_hf = ct->c_last_hf;
484 ct->c_first_hf = NULL;
485 ct->c_last_hf = NULL;
494 ** Fill out, or expand directives. Parse and execute
495 ** commands specified by profile composition strings.
499 if ((cp = strchr(prefix, 'a')) == NULL)
500 adios(NULL, "internal error(4)");
503 ** Scan the contents. Choose a transfer encoding, and
504 ** check if prefix for multipart boundary clashes with
505 ** any of the contents.
507 while (scan_content(ct) == NOTOK) {
512 adios(NULL, "giving up trying to find a unique delimiter string");
518 /* Build the rest of the header field structures */
526 ** Set up structures for placing unencoded
527 ** content when building parts.
531 init_decoded_content(CT ct)
535 if ((ce = (CE) calloc(1, sizeof(*ce))) == NULL)
536 adios(NULL, "out of memory");
539 ct->c_ceopenfnx = open7Bit; /* since unencoded */
540 ct->c_ceclosefnx = close_encoding;
541 ct->c_cesizefnx = NULL; /* since unencoded */
548 fgetstr(char *s, int n, FILE *stream)
552 for (ep = (cp = s) + n; cp < ep; ) {
555 if (!fgets(cp, n, stream))
556 return (cp != s ? s : NULL);
557 if (cp == s && *cp != '#')
560 cp += (i = strlen(cp)) - 1;
561 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
572 ** Parse the composition draft for text and directives.
573 ** Do initial setup of Content structure.
577 user_content(FILE *in, char *file, char *buf, CT *ctp)
585 struct str2init *s2i;
590 if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
595 /* allocate basic Content structure */
596 if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
597 adios(NULL, "out of memory");
600 /* allocate basic structure for handling decoded content */
601 init_decoded_content(ct);
608 ** Handle inline text. Check if line
609 ** is one of the following forms:
611 ** 1) doesn't begin with '#' (implicit directive)
612 ** 2) begins with "##" (implicit directive)
613 ** 3) begins with "#<"
615 if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
619 char content[BUFSIZ];
623 cp = m_mktemp2(NULL, invo_name, NULL, &out);
625 adios("mhbuild", "unable to create temporary file");
627 /* use a temp file to collect the plain text lines */
628 ce->ce_file = getcpy(cp);
631 if (buf[0] == '#' && buf[1] == '<') {
632 strncpy(content, buf + 2, sizeof(content));
639 /* the directive is implicit */
640 strncpy(content, "text/plain", sizeof(content));
642 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
646 if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
647 buffer[i=strlen(DESCR_FIELD)] == ':') {
651 ct->c_descr = add(buffer + i + 1, ct->c_descr);
652 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
653 adios(NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
661 adios(NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
669 if (headers >= 0 && uprf(buffer, DISPO_FIELD)
670 && buffer[i = strlen(DISPO_FIELD)] == ':') {
674 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
675 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
676 adios(NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
684 adios(NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
692 if (headers != 1 || buffer[0] != '\n')
698 if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
701 if (buffer[0] == '#') {
704 if (buffer[1] != '#')
706 for (cp = (bp = buffer) + 1; *cp; cp++)
714 /* parse content type */
715 if (get_ctinfo(content, ct, inlineD) == NOTOK)
718 for (s2i = str2cts; s2i->si_key; s2i++)
719 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
721 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
725 ** check type specified (possibly implicitly)
727 switch (ct->c_type = s2i->si_val) {
729 if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
730 ct->c_encoding = CE_7BIT;
735 adios(NULL, "it doesn't make sense to define an in-line %s content",
736 ct->c_type == CT_MESSAGE ? "message" :
742 if ((ct->c_ctinitfnx = s2i->si_init))
743 (*ct->c_ctinitfnx) (ct);
748 fseek(in, pos, SEEK_SET);
753 ** If we've reached this point, the next line
754 ** must be some type of explicit directive.
758 adios(NULL, "The #@ directive i.e. message/external-body "
759 "is not supported anymore.");
762 /* parse directive */
763 if (get_ctinfo(buf+1, ct, 1) == NOTOK)
766 /* check directive against the list of MIME types */
767 for (s2i = str2cts; s2i->si_key; s2i++)
768 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
772 ** Check if the directive specified a valid type.
773 ** This will happen if it was one of the following forms:
779 adios(NULL, "missing subtype in \"#%s\"", ci->ci_type);
781 switch (ct->c_type = s2i->si_val) {
783 adios(NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
787 if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
788 !mh_strcasecmp(ci->ci_subtype,
790 adios(NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
793 adios(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
797 if ((ct->c_ctinitfnx = s2i->si_init))
798 (*ct->c_ctinitfnx) (ct);
802 /* Handle [file] argument */
804 /* check if specifies command to execute */
805 if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
806 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
809 adios(NULL, "empty pipe command for #%s directive", ci->ci_type);
814 /* record filename of decoded contents */
815 ce->ce_file = ci->ci_magic;
816 if (access(ce->ce_file, R_OK) == NOTOK)
817 adios("reading", "unable to access %s for", ce->ce_file);
824 ** No [file] argument, so check profile for
825 ** method to compose content.
827 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
828 invo_name, ci->ci_type, ci->ci_subtype);
829 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
830 snprintf(buffer, sizeof(buffer), "%s-compose-%s",
831 invo_name, ci->ci_type);
832 if ((cp = context_find(buffer)) == NULL ||
834 content_error(NULL, ct, "don't know how to compose content");
838 ci->ci_magic = getcpy(cp);
844 ** #forw [+folder] [msgs]
846 if (!mh_strcasecmp(ci->ci_type, "forw")) {
848 char *folder, *arguments[MAXARGS];
854 ap = brkstring(ci->ci_magic, " ", "\n");
855 for (i=0; ap[i] && i<MAXARGS-1; i++) {
856 arguments[i] = ap[i];
861 arguments[0] = seq_cur;
866 /* search the arguments for a folder name */
867 for (ap = arguments; *ap; ap++) {
869 if (*cp == '+' || *cp == '@') {
871 adios(NULL, "only one folder per #forw directive");
873 folder = getcpy(expandfol(cp));
877 /* else, use the current folder */
879 folder = getcpy(getcurfol());
881 if (!(mp = folder_read(folder)))
882 adios(NULL, "unable to read folder %s", folder);
883 for (ap = arguments; *ap; ap++) {
885 if (*cp != '+' && *cp != '@')
886 if (!m_convert(mp, cp))
893 ** If there is more than one message to include, make this
894 ** a content of type "multipart/digest" and insert each message
895 ** as a subpart. If there is only one message, then make this
896 ** a content of type "message/rfc822".
898 if (mp->numsel > 1) {
899 /* we are forwarding multiple messages */
900 if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
902 ct->c_type = CT_MULTIPART;
903 ct->c_subtype = MULTI_DIGEST;
905 if ((m = (struct multipart *)
906 calloc(1, sizeof(*m))) == NULL)
907 adios(NULL, "out of memory");
908 ct->c_ctparams = (void *) m;
911 for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
912 if (is_selected(mp, msgnum)) {
917 if ((p = (CT) calloc(1, sizeof(*p)))
919 adios(NULL, "out of memory");
920 init_decoded_content(p);
922 if (get_ctinfo("message/rfc822", p, 0)
925 p->c_type = CT_MESSAGE;
926 p->c_subtype = MESSAGE_RFC822;
928 snprintf(buffer, sizeof(buffer),
929 "%s/%d", mp->foldpath,
931 pe->ce_file = getcpy(buffer);
933 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
934 adios(NULL, "out of memory");
941 /* we are forwarding one message */
942 if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
944 ct->c_type = CT_MESSAGE;
945 ct->c_subtype = MESSAGE_RFC822;
948 snprintf(buffer, sizeof(buffer), "%s/%d",
949 mp->foldpath, msgnum);
950 ce->ce_file = getcpy(buffer);
953 folder_free(mp); /* free folder/message structure */
960 if (!mh_strcasecmp(ci->ci_type, "end")) {
967 ** #begin [ alternative | parallel ]
969 if (!mh_strcasecmp(ci->ci_type, "begin")) {
972 cp = SubMultiPart[vrsn - 1].kv_key;
973 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
974 vrsn = MULTI_ALTERNATE;
975 cp = SubMultiPart[vrsn - 1].kv_key;
976 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
977 vrsn = MULTI_PARALLEL;
978 cp = SubMultiPart[vrsn - 1].kv_key;
979 } else if (uprf(ci->ci_magic, "digest")) {
982 vrsn = MULTI_UNKNOWN;
987 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
988 if (get_ctinfo(buffer, ct, 0) == NOTOK)
990 ct->c_type = CT_MULTIPART;
991 ct->c_subtype = vrsn;
993 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
994 adios(NULL, "out of memory");
995 ct->c_ctparams = (void *) m;
998 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
1002 if (user_content(in, file, buffer, &p) == DONE) {
1004 adios(NULL, "empty \"#begin ... #end\" sequence");
1010 if ((part = (struct part *)
1011 calloc(1, sizeof(*part))) == NULL)
1012 adios(NULL, "out of memory");
1014 pp = &part->mp_next;
1017 admonish(NULL, "premature end-of-file, missing #end");
1022 ** Unknown directive
1024 adios(NULL, "unknown directive \"#%s\"", ci->ci_type);
1025 return NOTOK; /* NOT REACHED */
1030 set_id(CT ct, int top)
1034 static time_t clock = 0;
1035 static char *msgfmt;
1039 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1040 (int) getpid(), (long) clock, LocalName());
1042 msgfmt = getcpy(msgid);
1044 snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1045 ct->c_id = getcpy(msgid);
1050 ** Fill out, or expand the various contents in the composition
1051 ** draft. Read-in any necessary files. Parse and execute any
1052 ** commands specified by profile composition strings.
1056 compose_content(CT ct)
1058 CE ce = ct->c_cefile;
1060 switch (ct->c_type) {
1065 char partnam[BUFSIZ];
1066 struct multipart *m = (struct multipart *) ct->c_ctparams;
1070 snprintf(partnam, sizeof(partnam), "%s.",
1072 pp = partnam + strlen(partnam);
1077 /* first, we call compose_content on all the subparts */
1078 for (part = m->mp_parts, partnum = 1; part;
1079 part = part->mp_next, partnum++) {
1080 CT p = part->mp_part;
1082 sprintf(pp, "%d", partnum);
1083 p->c_partno = getcpy(partnam);
1084 if (compose_content(p) == NOTOK)
1091 /* Nothing to do for type message */
1095 ** Discrete types (text/application/audio/image/video)
1100 int xstdout, len, buflen;
1101 char *bp, **ap, *cp;
1102 char *vec[4], buffer[BUFSIZ];
1104 CI ci = &ct->c_ctinfo;
1107 if (!(cp = ci->ci_magic))
1108 adios(NULL, "internal error(5)");
1110 tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1111 if (tfile == NULL) {
1112 adios("mhbuild", "unable to create temporary file");
1114 ce->ce_file = getcpy(tfile);
1119 /* Get buffer ready to go */
1122 buflen = sizeof(buffer);
1125 ** Parse composition string into buffer
1127 for ( ; *cp; cp++) {
1133 ** insert parameters from
1139 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1140 snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1150 /* %f, and stdout is not-redirected */
1156 ** insert temporary filename
1157 ** where content should be
1160 snprintf(bp, buflen, "%s", ce->ce_file);
1164 /* insert content subtype */
1165 strncpy(bp, ci->ci_subtype, buflen);
1169 /* insert character % */
1190 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1192 fflush(stdout); /* not sure if need for -noverbose */
1199 if ((out = fopen(ce->ce_file, "w")) == NULL)
1200 adios(ce->ce_file, "unable to open for writing");
1202 switch (child_id = fork()) {
1204 adios("fork", "unable to fork");
1209 dup2(fileno(out), 1);
1211 execvp("/bin/sh", vec);
1212 fprintf(stderr, "unable to exec ");
1219 if (pidXwait(child_id, NULL))
1232 ** Scan the content.
1234 ** 1) choose a transfer encoding.
1235 ** 2) check for clashes with multipart boundary string.
1236 ** 3) for text content, figure out which character set is being used.
1238 ** If there is a clash with one of the contents and the multipart boundary,
1239 ** this function will exit with NOTOK. This will cause the scanning process
1240 ** to be repeated with a different multipart boundary. It is possible
1241 ** (although highly unlikely) that this scan will be repeated multiple times.
1248 int check8bit = 0, contains8bit = 0; /* check if contains 8bit data */
1249 int checklinelen = 0, linelen = 0; /* check for long lines */
1250 int checkboundary = 0, boundaryclash = 0; /* check if clashes with multipart boundary */
1251 int checklinespace = 0, linespace = 0; /* check if any line ends with space */
1252 unsigned char *cp = NULL, buffer[BUFSIZ];
1253 struct text *t = NULL;
1255 CE ce = ct->c_cefile;
1258 ** handle multipart by scanning all subparts
1259 ** and then checking their encoding.
1261 if (ct->c_type == CT_MULTIPART) {
1262 struct multipart *m = (struct multipart *) ct->c_ctparams;
1265 /* initially mark the domain of enclosing multipart as 7bit */
1266 ct->c_encoding = CE_7BIT;
1268 for (part = m->mp_parts; part; part = part->mp_next) {
1269 CT p = part->mp_part;
1271 if (scan_content(p) == NOTOK) {
1272 /* choose encoding for subpart */
1277 ** if necessary, enlarge encoding for enclosing
1280 if (p->c_encoding == CE_BINARY)
1281 ct->c_encoding = CE_BINARY;
1282 if (p->c_encoding == CE_8BIT &&
1283 ct->c_encoding != CE_BINARY)
1284 ct->c_encoding = CE_8BIT;
1291 ** Decide what to check while scanning this content.
1293 switch (ct->c_type) {
1297 if (ct->c_subtype == TEXT_PLAIN) {
1306 case CT_APPLICATION:
1324 ** Don't check anything for these types,
1325 ** since we are forcing use of base64.
1335 ** Scan the unencoded content
1337 if (check8bit || checklinelen || checklinespace || checkboundary) {
1338 if ((in = fopen(ce->ce_file, "r")) == NULL)
1339 adios(ce->ce_file, "unable to open for reading");
1340 len = strlen(prefix);
1342 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1344 ** Check for 8bit data.
1347 for (cp = buffer; *cp; cp++) {
1348 if (!isascii(*cp)) {
1350 /* no need to keep checking */
1357 ** Check line length.
1359 if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1361 checklinelen = 0; /* no need to keep checking */
1365 ** Check if line ends with a space.
1367 if (checklinespace &&
1368 (cp = buffer + strlen(buffer) - 2) >
1369 buffer && isspace(*cp)) {
1371 /* no need to keep checking */
1376 ** Check if content contains a line that clashes
1377 ** with our standard boundary for multipart messages.
1379 if (checkboundary && buffer[0] == '-' &&
1381 for (cp = buffer + strlen(buffer) - 1;
1386 if (strncmp(buffer + 2, prefix, len)==0 &&
1387 isdigit(buffer[2 + len])) {
1389 /* no need to keep checking */
1398 ** Decide which transfer encoding to use.
1400 switch (ct->c_type) {
1403 ** If the text content didn't specify a character
1404 ** set, we need to figure out which one was used.
1406 t = (struct text *) ct->c_ctparams;
1407 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1408 CI ci = &ct->c_ctinfo;
1411 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1415 t->tx_charset = CHARSET_UNKNOWN;
1416 *ap = concat("charset=", write_charset_8bit(),
1419 t->tx_charset = CHARSET_USASCII;
1420 *ap = getcpy("charset=us-ascii");
1423 cp = strchr(*ap++, '=');
1429 if (contains8bit || linelen || linespace)
1430 ct->c_encoding = CE_QUOTED;
1432 ct->c_encoding = CE_7BIT;
1435 case CT_APPLICATION:
1436 /* For application type, use base64, except when postscript */
1437 if (contains8bit || linelen || linespace)
1438 ct->c_encoding = (ct->c_subtype ==
1439 APPLICATION_POSTSCRIPT) ?
1440 CE_QUOTED : CE_BASE64;
1442 ct->c_encoding = CE_7BIT;
1446 ct->c_encoding = CE_7BIT;
1452 /* For audio, image, and video contents, just use base64 */
1453 ct->c_encoding = CE_BASE64;
1457 return (boundaryclash ? NOTOK : OK);
1462 ** Scan the content structures, and build header
1463 ** fields that will need to be output into the
1468 build_headers(CT ct)
1472 char *np, *vp, buffer[BUFSIZ];
1473 CI ci = &ct->c_ctinfo;
1476 ** If message is type multipart, then add the multipart
1477 ** boundary to the list of attribute/value pairs.
1479 if (ct->c_type == CT_MULTIPART) {
1481 static int level = 0; /* store nesting level */
1485 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1487 cp = strchr(*ap++ = getcpy(buffer), '=');
1494 ** output the content type and subtype
1496 np = getcpy(TYPE_FIELD);
1497 vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1499 /* keep track of length of line */
1500 len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1501 strlen(ci->ci_subtype) + 3;
1504 ** Append the attribute/value pairs to
1505 ** the end of the Content-Type line.
1507 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1511 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1512 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1513 vp = add("\n\t", vp);
1519 vp = add(buffer, vp);
1524 ** Append any RFC-822 comment to the end of
1525 ** the Content-Type line.
1527 if (ci->ci_comment) {
1528 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1529 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1530 vp = add("\n\t", vp);
1536 vp = add(buffer, vp);
1540 add_header(ct, np, vp);
1543 ** output the Content-ID
1546 np = getcpy(ID_FIELD);
1547 vp = concat(" ", ct->c_id, NULL);
1548 add_header(ct, np, vp);
1552 ** output the Content-Description
1555 np = getcpy(DESCR_FIELD);
1556 vp = concat(" ", ct->c_descr, NULL);
1557 add_header(ct, np, vp);
1561 ** output the Content-Disposition
1564 np = getcpy(DISPO_FIELD);
1565 vp = concat(" ", ct->c_dispo, NULL);
1566 add_header(ct, np, vp);
1570 ** output the Content-Transfer-Encoding
1572 switch (ct->c_encoding) {
1574 /* Nothing to output */
1578 if (ct->c_type == CT_MESSAGE)
1579 adios(NULL, "internal error, invalid encoding");
1581 np = getcpy(ENCODING_FIELD);
1582 vp = concat(" ", "8bit", "\n", NULL);
1583 add_header(ct, np, vp);
1587 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1588 adios(NULL, "internal error, invalid encoding");
1590 np = getcpy(ENCODING_FIELD);
1591 vp = concat(" ", "quoted-printable", "\n", NULL);
1592 add_header(ct, np, vp);
1596 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1597 adios(NULL, "internal error, invalid encoding");
1599 np = getcpy(ENCODING_FIELD);
1600 vp = concat(" ", "base64", "\n", NULL);
1601 add_header(ct, np, vp);
1605 if (ct->c_type == CT_MESSAGE)
1606 adios(NULL, "internal error, invalid encoding");
1608 np = getcpy(ENCODING_FIELD);
1609 vp = concat(" ", "binary", "\n", NULL);
1610 add_header(ct, np, vp);
1614 adios(NULL, "unknown transfer encoding in content");
1619 ** Additional content specific header processing
1621 switch (ct->c_type) {
1624 struct multipart *m;
1627 m = (struct multipart *) ct->c_ctparams;
1628 for (part = m->mp_parts; part; part = part->mp_next) {