2 ** mhoutsbr.c -- routines to output MIME messages
3 ** -- given a Content structure
5 ** This code is Copyright (c) 2002, by the authors of nmh. See the
6 ** COPYRIGHT file in the root directory of the nmh distribution for
7 ** complete copyright information.
12 #include <h/signals.h>
17 #include <h/mhparse.h>
21 static char ebcdicsafe[0x100] = {
22 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
23 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
24 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
25 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
26 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
27 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
28 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
29 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
30 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
31 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
32 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
33 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01,
34 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
35 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
36 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
37 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
38 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
40 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
56 static char nib2b64[0x40+1] =
57 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
62 int output_message(CT, char *);
63 int output_message_fp(CT, FILE *, char *);
64 int writeBase64aux(FILE *, FILE *);
69 static int output_content(CT, FILE *);
70 static void output_headers(CT, FILE *);
71 static int writeExternalBody(CT, FILE *);
72 static int write8Bit(CT, FILE *);
73 static int writeQuoted(CT, FILE *);
74 static int writeBase64(CT, FILE *);
78 ** Main routine to output a MIME message contained
79 ** in a Content structure, to a file. Any necessary
80 ** transfer encoding is added.
84 output_message_fp(CT ct, FILE *fp, char *file)
86 if (output_content(ct, fp) == NOTOK)
90 advise((file?file:"<FILE*>"), "error writing to");
97 output_message(CT ct, char *file)
102 if ((fp = fopen(file, "w")) == NULL) {
103 advise(file, "unable to open for writing");
106 status = output_message_fp(ct, fp, file);
113 ** Output a Content structure to a file.
117 output_content(CT ct, FILE *out)
120 CI ci = &ct->c_ctinfo;
123 ** Output all header fields for this content
125 output_headers(ct, out);
128 ** If this is the internal content structure for a
129 ** "message/external", then we are done with the
130 ** headers (since it has no body).
136 ** Now output the content bodies.
138 switch (ct->c_type) {
147 m = (struct multipart *) ct->c_ctparams;
148 for (part = m->mp_parts; part; part = part->mp_next) {
149 CT p = part->mp_part;
151 fprintf(out, "\n--%s\n", ci->ci_values[0]);
152 if (output_content(p, out) == NOTOK)
155 fprintf(out, "\n--%s--\n", ci->ci_values[0]);
161 if (ct->c_subtype == MESSAGE_EXTERNAL) {
164 e = (struct exbody *) ct->c_ctparams;
165 if (output_content(e->eb_content, out) == NOTOK)
168 /* output phantom body for access-type "mail-server" */
170 writeExternalBody(ct, out);
172 result = write8Bit(ct, out);
177 ** Handle discrete types (text/application/audio/image/video)
180 switch (ct->c_encoding) {
183 result = write8Bit(ct, out);
188 result = write8Bit(ct, out);
193 result = writeQuoted(ct, out);
198 result = writeBase64(ct, out);
202 advise(NULL, "can't handle binary transfer encoding in content");
207 advise(NULL, "unknown transfer encoding in content");
219 ** Output all the header fields for a content
223 output_headers(CT ct, FILE *out)
229 fprintf(out, "%s:%s", hp->name, hp->value);
236 ** Write the phantom body for access-type "mail-server".
240 writeExternalBody(CT ct, FILE *out)
242 char **ap, **ep, *cp;
243 struct exbody *e = (struct exbody *) ct->c_ctparams;
246 for (cp = e->eb_body; *cp; cp++) {
247 CT ct2 = e->eb_content;
248 CI ci2 = &ct2->c_ctinfo;
254 char *dp = trimcpy(ct2->c_id);
262 for (ap = ci2->ci_attrs, ep = ci2->ci_values;
264 if (!mh_strcasecmp(*ap, "name")) {
265 fprintf(out, "%s", *ep);
271 fprintf(out, "%s/%s", ci2->ci_type,
273 for (ap = ci2->ci_attrs, ep = ci2->ci_values;
275 fprintf(out, "; %s=\"%s\"", *ap, *ep);
308 ** Output a content without any transfer encoding
312 write8Bit(CT ct, FILE *out)
315 char c, *file, buffer[BUFSIZ];
316 CE ce = ct->c_cefile;
319 if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
323 while (fgets(buffer, sizeof(buffer) - 1, ce->ce_fp)) {
324 c = buffer[strlen(buffer) - 1];
330 (*ct->c_ceclosefnx) (ct);
336 ** Output a content using quoted-printable
340 writeQuoted(CT ct, FILE *out)
344 char c, buffer[BUFSIZ];
345 CE ce = ct->c_cefile;
348 if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
351 while (fgets(buffer, sizeof(buffer) - 1, ce->ce_fp)) {
354 cp = buffer + strlen(buffer) - 1;
355 if ((c = *cp) == '\n')
358 if (strncmp(cp = buffer, "From ", sizeof("From ") - 1) == 0) {
359 fprintf(out, "=%02X", *cp++ & 0xff);
365 if (n > CPERLIN - 3) {
378 if (*cp < '!' || *cp > '~' || (ebcdicsw && !ebcdicsafe[*cp & 0xff]))
386 fprintf(out, "=%02X", *cp & 0xff);
393 if (cp > buffer && (*--cp == ' ' || *cp == '\t'))
402 (*ct->c_ceclosefnx) (ct);
408 ** Output a content using base64
412 writeBase64(CT ct, FILE *out)
416 CE ce = ct->c_cefile;
419 if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
422 result = writeBase64aux(ce->ce_fp, out);
423 (*ct->c_ceclosefnx) (ct);
429 writeBase64aux(FILE *in, FILE *out)
435 while ((cc = fread(inbuf, sizeof(*inbuf), sizeof(inbuf), in)) > 0) {
440 if (cc < sizeof(inbuf)) {
442 if (cc < sizeof(inbuf) - 1)
445 bits = (inbuf[0] & 0xff) << 16;
446 bits |= (inbuf[1] & 0xff) << 8;
447 bits |= inbuf[2] & 0xff;
449 for (bp = outbuf + sizeof(outbuf); bp > outbuf; bits >>= 6)
450 *--bp = nib2b64[bits & 0x3f];
451 if (cc < sizeof(inbuf)) {
453 if (cc < sizeof inbuf - 1)
457 fwrite(outbuf, sizeof(*outbuf), sizeof(outbuf), out);
459 if (cc < sizeof(inbuf)) {