mpack_src/mpack-1.6-4/encode.c

/* (C) Copyright 1993,1994 by Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of Carnegie
 * Mellon University not be used in advertising or publicity
 * pertaining to distribution of the software without specific,
 * written prior permission.  Carnegie Mellon University makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

extern char *magic_look(FILE *infile);
extern char *os_genid(void);
extern FILE *os_createnewfile(char *fname);
extern char *md5digest(FILE *infile, long int *len);
extern void os_perror(char *str);
extern int to64(FILE *infile, FILE *outfile, long int limit);

#define NUMREFERENCES 4
int attachment;

/*
 * Encode a file into one or more MIME messages, each
 * no larger than 'maxsize'.  A 'maxsize' of zero means no size limit.
 * If 'applefile' is non-null, it is the first part of a multipart/appledouble
 * pair.
 */
int encode(FILE *infile, FILE *applefile, char *fname, FILE *descfile, char *subject, char *headers, long int maxsize, char *typeoverride, char *outfname)
{
    char *type;
    FILE *outfile;
    char *cleanfname, *p;
    char *digest, *appledigest = NULL;
    long filesize, l, written;
    int thispart, numparts = 1;
    int wrotefiletype = 0;
    char *multipartid, *msgid, *referenceid[NUMREFERENCES];
    char buf[1024];
    int i;

    /* Clean up fname for printing */
    cleanfname = fname;
#ifdef __riscos
    /* This filename-cleaning knowledge will probably
     * be moved to the os layer in a future version.
     */
    if ((p = strrchr(cleanfname, '.'))) cleanfname = p+1;
#else
    if ((p = strrchr(cleanfname, '/'))) cleanfname = p+1;
    if ((p = strrchr(cleanfname, '\\'))) cleanfname = p+1;
#endif
    if ((p = strrchr(cleanfname, ':'))) cleanfname = p+1;

    /* Find file type */
    if (typeoverride) {
        type = typeoverride;
    }
    else {
        type = magic_look(infile);
    }

    /* Compute MD5 digests */
    digest = md5digest(infile, &filesize);
    if (applefile) {
        appledigest = md5digest(applefile, &l);
        filesize += l;
    }

    /* See if we have to do multipart */
    if (maxsize) {
        filesize = (filesize / 54) * 73; /* Allow for base64 expansion */

        /* Add in size of desc file */
        if (descfile) {
            free(md5digest(descfile, &l));      /* XXX */
            filesize += l;
        }

        numparts = (filesize-1000)/maxsize + 1;
        if (numparts < 1) numparts = 1;
    }

    multipartid = os_genid();
    for (i=0; i<NUMREFERENCES; i++) {
        referenceid[i] = 0;
    }

    for (thispart=1; thispart <= numparts; thispart++) {
        written = 0;

        /* Open output file */
        if (numparts == 1) {
            outfile = os_createnewfile(outfname);
        }
        else {
#ifdef __riscos
            /* Arrgh, riscos uses '.' as directory separator */
            sprintf(buf, "%s/%02d", outfname, thispart);
#else
            sprintf(buf, "%s.%02d", outfname, thispart);
#endif
            outfile = os_createnewfile(buf);
        }
        if (!outfile) {
            os_perror(buf);
            return 1;
        }
        
        msgid = os_genid();
        fprintf(outfile, "Message-ID: <%s>\n", msgid);
        fprintf(outfile, "Mime-Version: 1.0\n");
        if (headers) fputs(headers, outfile);
        if (numparts > 1) {
            fprintf(outfile, "Subject: %s (%02d/%02d)\n", subject,
                    thispart, numparts);
            if (thispart == 1) {
                referenceid[0] = msgid;
            }
            else {
                /* Put out References: header pointing to previous parts */
                fprintf(outfile, "References: <%s>\n", referenceid[0]);
                for (i=1; i<NUMREFERENCES; i++) {
                    if (referenceid[i]) fprintf(outfile, "\t <%s>\n",
                                                referenceid[i]);
                }
                for (i=2; i<NUMREFERENCES; i++) {
                    referenceid[i-1] = referenceid[i];
                }
                referenceid[NUMREFERENCES-1] = msgid;
            }
            fprintf(outfile,
                    "Content-Type: message/partial; number=%d; total=%d;\n",
                    thispart, numparts);
            fprintf(outfile, "\t id=\"%s\"\n", multipartid);
            fprintf(outfile, "\n");
        }

        if (thispart == 1) {
            if (numparts > 1) {
                fprintf(outfile, "Message-ID: <%s>\n", multipartid);
                fprintf(outfile, "MIME-Version: 1.0\n");
            }
            fprintf(outfile, "Subject: %s\n", subject);
            fprintf(outfile,
                    "Content-Type: multipart/mixed; boundary=\"-\"\n");
            fprintf(outfile,
"\nThis is a MIME encoded message.  Decode it with \"munpack\"\n");
            fprintf(outfile,
"or any other MIME reading software.  Mpack/munpack is available\n");
            fprintf(outfile,
"via anonymous FTP in ftp.andrew.cmu.edu:pub/mpack/\n");
            written = 300;

            /* Spit out description section */
            if (descfile) {
                fprintf(outfile, "---\n\n");
                while (fgets(buf, sizeof(buf), descfile)) {
                    /* Strip multiple leading dashes as they may become MIME
                     * boundaries
                     */
                    p = buf;
                    if (*p == '-') {
                        while (p[1] == '-') p++;
                    }

                    fputs(p, outfile);
                    written += strlen(p);
                }
                fprintf(outfile, "\n");
            }
    
            fprintf(outfile, "---\n");

            if (applefile) {
                fprintf(outfile,
        "Content-Type: multipart/appledouble; boundary=\"=\"; name=\"%s\"\n",
                        cleanfname);
                fprintf(outfile,
                        "Content-Disposition: %s; filename=\"%s\"\n",
                        attachment ? "attachment" : "inline", cleanfname);
                fprintf(outfile, "\n\n--=\n");
                fprintf(outfile, "Content-Type: application/applefile\n");
                fprintf(outfile, "Content-Transfer-Encoding: base64\n");
                fprintf(outfile, "Content-MD5: %s\n\n", appledigest);
                free(appledigest);
                written += 100;
            }

        }

        if (applefile && !feof(applefile)) {
            if (written == maxsize) written--; /* avoid a nasty fencepost error */
            written += to64(applefile, outfile,
                            (thispart == numparts) ? 0 : (maxsize-written));

            if (!feof(applefile)) {
                fclose(outfile);
                continue;
            }

            fprintf(outfile, "\n--=\n");
        }


        if (!wrotefiletype++) {
            fprintf(outfile, "Content-Type: %s; name=\"%s\"\n", type,
                    cleanfname);
            fprintf(outfile, "Content-Transfer-Encoding: base64\n");
            fprintf(outfile, "Content-Disposition: %s; filename=\"%s\"\n",
                    attachment ? "attachment" : "inline", cleanfname);
            fprintf(outfile, "Content-MD5: %s\n\n", digest);
            free(digest);
            written += 80;
        }

        if (written == maxsize) written--; /* avoid a nasty fencepost error */

        written += to64(infile, outfile,
                        (thispart == numparts) ? 0 : (maxsize-written));

        if (thispart == numparts) {
            if (applefile) fprintf(outfile, "\n--=--\n");
            fprintf(outfile, "\n-----\n");
        }
        
        fclose(outfile);    
    }

    return 0;
}
1	/* (C) Copyright 1993,1994 by Carnegie Mellon University
2	* All Rights Reserved.
3	*
4	* Permission to use, copy, modify, distribute, and sell this software
5	* and its documentation for any purpose is hereby granted without
6	* fee, provided that the above copyright notice appear in all copies
7	* and that both that copyright notice and this permission notice
8	* appear in supporting documentation, and that the name of Carnegie
9	* Mellon University not be used in advertising or publicity
10	* pertaining to distribution of the software without specific,
11	* written prior permission. Carnegie Mellon University makes no
12	* representations about the suitability of this software for any
13	* purpose. It is provided "as is" without express or implied
14	* warranty.
15	*
16	* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
17	* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
18	* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
19	* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
21	* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
22	* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
23	* SOFTWARE.
24	*/
25	#include <stdio.h>
26	#include <stdlib.h>
27	#include <string.h>
28
29	extern char magic_look(FILE infile);
30	extern char *os_genid(void);
31	extern FILE os_createnewfile(char fname);
32	extern char md5digest(FILE infile, long int *len);
33	extern void os_perror(char *str);
34	extern int to64(FILE infile, FILE outfile, long int limit);
35
36	#define NUMREFERENCES 4
37	int attachment;
38
39	/*
40	* Encode a file into one or more MIME messages, each
41	* no larger than 'maxsize'. A 'maxsize' of zero means no size limit.
42	* If 'applefile' is non-null, it is the first part of a multipart/appledouble
43	* pair.
44	*/
45	int encode(FILE infile, FILE applefile, char fname, FILE descfile, char subject, char headers, long int maxsize, char typeoverride, char outfname)
46	{
47	char *type;
48	FILE *outfile;
49	char cleanfname, p;
50	char digest, appledigest = NULL;
51	long filesize, l, written;
52	int thispart, numparts = 1;
53	int wrotefiletype = 0;
54	char multipartid, msgid, *referenceid[NUMREFERENCES];
55	char buf[1024];
56	int i;
57
58	/* Clean up fname for printing */
59	cleanfname = fname;
60	#ifdef __riscos
61	/* This filename-cleaning knowledge will probably
62	* be moved to the os layer in a future version.
63	*/
64	if ((p = strrchr(cleanfname, '.'))) cleanfname = p+1;
65	#else
66	if ((p = strrchr(cleanfname, '/'))) cleanfname = p+1;
67	if ((p = strrchr(cleanfname, '\\'))) cleanfname = p+1;
68	#endif
69	if ((p = strrchr(cleanfname, ':'))) cleanfname = p+1;
70
71	/* Find file type */
72	if (typeoverride) {
73	type = typeoverride;
74	}
75	else {
76	type = magic_look(infile);
77	}
78
79	/* Compute MD5 digests */
80	digest = md5digest(infile, &filesize);
81	if (applefile) {
82	appledigest = md5digest(applefile, &l);
83	filesize += l;
84	}
85
86	/* See if we have to do multipart */
87	if (maxsize) {
88	filesize = (filesize / 54) * 73; /* Allow for base64 expansion */
89
90	/* Add in size of desc file */
91	if (descfile) {
92	free(md5digest(descfile, &l)); /* XXX */
93	filesize += l;
94	}
95
96	numparts = (filesize-1000)/maxsize + 1;
97	if (numparts < 1) numparts = 1;
98	}
99
100	multipartid = os_genid();
101	for (i=0; i<NUMREFERENCES; i++) {
102	referenceid[i] = 0;
103	}
104
105	for (thispart=1; thispart <= numparts; thispart++) {
106	written = 0;
107
108	/* Open output file */
109	if (numparts == 1) {
110	outfile = os_createnewfile(outfname);
111	}
112	else {
113	#ifdef __riscos
114	/* Arrgh, riscos uses '.' as directory separator */
115	sprintf(buf, "%s/%02d", outfname, thispart);
116	#else
117	sprintf(buf, "%s.%02d", outfname, thispart);
118	#endif
119	outfile = os_createnewfile(buf);
120	}
121	if (!outfile) {
122	os_perror(buf);
123	return 1;
124	}
125
126	msgid = os_genid();
127	fprintf(outfile, "Message-ID: <%s>\n", msgid);
128	fprintf(outfile, "Mime-Version: 1.0\n");
129	if (headers) fputs(headers, outfile);
130	if (numparts > 1) {
131	fprintf(outfile, "Subject: %s (%02d/%02d)\n", subject,
132	thispart, numparts);
133	if (thispart == 1) {
134	referenceid[0] = msgid;
135	}
136	else {
137	/* Put out References: header pointing to previous parts */
138	fprintf(outfile, "References: <%s>\n", referenceid[0]);
139	for (i=1; i<NUMREFERENCES; i++) {
140	if (referenceid[i]) fprintf(outfile, "\t <%s>\n",
141	referenceid[i]);
142	}
143	for (i=2; i<NUMREFERENCES; i++) {
144	referenceid[i-1] = referenceid[i];
145	}
146	referenceid[NUMREFERENCES-1] = msgid;
147	}
148	fprintf(outfile,
149	"Content-Type: message/partial; number=%d; total=%d;\n",
150	thispart, numparts);
151	fprintf(outfile, "\t id=\"%s\"\n", multipartid);
152	fprintf(outfile, "\n");
153	}
154
155	if (thispart == 1) {
156	if (numparts > 1) {
157	fprintf(outfile, "Message-ID: <%s>\n", multipartid);
158	fprintf(outfile, "MIME-Version: 1.0\n");
159	}
160	fprintf(outfile, "Subject: %s\n", subject);
161	fprintf(outfile,
162	"Content-Type: multipart/mixed; boundary=\"-\"\n");
163	fprintf(outfile,
164	"\nThis is a MIME encoded message. Decode it with \"munpack\"\n");
165	fprintf(outfile,
166	"or any other MIME reading software. Mpack/munpack is available\n");
167	fprintf(outfile,
168	"via anonymous FTP in ftp.andrew.cmu.edu:pub/mpack/\n");
169	written = 300;
170
171	/* Spit out description section */
172	if (descfile) {
173	fprintf(outfile, "---\n\n");
174	while (fgets(buf, sizeof(buf), descfile)) {
175	/* Strip multiple leading dashes as they may become MIME
176	* boundaries
177	*/
178	p = buf;
179	if (*p == '-') {
180	while (p[1] == '-') p++;
181	}
182
183	fputs(p, outfile);
184	written += strlen(p);
185	}
186	fprintf(outfile, "\n");
187	}
188
189	fprintf(outfile, "---\n");
190
191	if (applefile) {
192	fprintf(outfile,
193	"Content-Type: multipart/appledouble; boundary=\"=\"; name=\"%s\"\n",
194	cleanfname);
195	fprintf(outfile,
196	"Content-Disposition: %s; filename=\"%s\"\n",
197	attachment ? "attachment" : "inline", cleanfname);
198	fprintf(outfile, "\n\n--=\n");
199	fprintf(outfile, "Content-Type: application/applefile\n");
200	fprintf(outfile, "Content-Transfer-Encoding: base64\n");
201	fprintf(outfile, "Content-MD5: %s\n\n", appledigest);
202	free(appledigest);
203	written += 100;
204	}
205
206	}
207
208	if (applefile && !feof(applefile)) {
209	if (written == maxsize) written--; /* avoid a nasty fencepost error */
210	written += to64(applefile, outfile,
211	(thispart == numparts) ? 0 : (maxsize-written));
212
213	if (!feof(applefile)) {
214	fclose(outfile);
215	continue;
216	}
217
218	fprintf(outfile, "\n--=\n");
219	}
220
221
222	if (!wrotefiletype++) {
223	fprintf(outfile, "Content-Type: %s; name=\"%s\"\n", type,
224	cleanfname);
225	fprintf(outfile, "Content-Transfer-Encoding: base64\n");
226	fprintf(outfile, "Content-Disposition: %s; filename=\"%s\"\n",
227	attachment ? "attachment" : "inline", cleanfname);
228	fprintf(outfile, "Content-MD5: %s\n\n", digest);
229	free(digest);
230	written += 80;
231	}
232
233	if (written == maxsize) written--; /* avoid a nasty fencepost error */
234
235	written += to64(infile, outfile,
236	(thispart == numparts) ? 0 : (maxsize-written));
237
238	if (thispart == numparts) {
239	if (applefile) fprintf(outfile, "\n--=--\n");
240	fprintf(outfile, "\n-----\n");
241	}
242
243	fclose(outfile);
244	}
245
246	return 0;
247	}