tools/mpack-1.6/uudecode.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 <ctype.h>
#include <string.h>
#include "xmalloc.h"
#include "common.h"
#include "part.h"

extern char *os_idtodir(char *id);
extern FILE *os_newtypedfile(char *fname, char *contentType, int flags, params contentParams);
extern FILE *os_createnewfile(char *fname);

static FILE *startDescFile(char *fname);


/* Length of a normal uuencoded line, including newline */
#define UULENGTH 62

/*
 * Table of valid boundary characters
 *
 * XXX: Old versions of Mark Crispin's c-client library
 * generate boundaries which contain the syntactically
 * illegal character '#'.  It is marked in this table with
 * a 2 in case we want to use this table in the future to
 * complain about bad syntax.
 *
 */
static char bchar[256] = {
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     1, 0, 0, 2,  0, 0, 0, 1,  1, 1, 0, 1,  1, 1, 1, 1,
     1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 0,  0, 1, 0, 1,
     0, 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,  0, 0, 0, 1,
     0, 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,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
     0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
};

/*
 * Read an input file, looking for data in split-uuencode format
 */
int handleUuencode(struct part *inpart, char *subject, int extractText)
{
    char *fname = 0, *tmpfname;
    int part, nparts;
    int tmppart, tmpnparts;
    char buf[1024], buf2[1024];
    char fnamebuf[80];
    char *boundary_end, *p;
    int wantdescfile = 0;
    FILE *descfile = 0;

    /* Scan "Subject:" header for filename/part information */
    if (parseSubject(subject, &fname, &part, &nparts) != 0) {
        part = -1;
    }
    if (part == 0) {
        return saveUuFile(inpart, fname, part, nparts, (char *)0);
    }
    if (part == 1) {
        wantdescfile = 1;
    }

    /* Scan body for interesting lines */
    while (part_gets(buf, sizeof(buf), inpart)) {
        /* Uuencode "begin" line */
        if (!strncmp(buf, "begin ", 6) &&
            isdigit(buf[6]) && isdigit(buf[7]) && isdigit(buf[8]) &&
            buf[9] == ' ') {
            if (part == -1) {
                /*
                 * We have no part N of M information.  Perhaps it is
                 * a single-part uuencoded file.
                 */
                return saveUuFile(inpart, (char *)0, 1, 0, buf);
            }
            else {
                if (descfile) fclose(descfile);
                return saveUuFile(inpart, fname, part, nparts, buf);
            }
        }
        else if (!strncmp(buf, "section ", 8) && isdigit(buf[8])) {
            tmppart = 0;
            for (p = buf+8; isdigit(*p); p++) tmppart = tmppart*10 + *p - '0';
            if (tmppart == 0) continue;
            if (strncmp(p, " of ", 4) == 0) {
                /*
                 * "section N of ... of file F ..."
                 */
                for (p += 4; *p && strncmp(p, " of file ", 9) != 0; p++);
                if (!*p) continue;
                p += 9;
                tmpfname = p;
                p = strchr(p, ' ');
                if (!p) continue;
                *p = '\0';
                if (descfile) fclose(descfile);
                return saveUuFile(inpart, tmpfname, tmppart, 0, (char *)0);
            }
            else if (*p == '/' && isdigit(p[1])) {
                /*
                 * "section N/M   file F ..."
                 */
                tmpnparts = 0;
                for (p++; isdigit(*p); p++) {
                    tmpnparts = tmpnparts*10 + *p - '0';
                }
                while (*p && isspace(*p)) p++;
                if (tmppart > tmpnparts || strncmp(p, "file ", 5) != 0) {
                    continue;
                }
                tmpfname = p+5;
                p = strchr(tmpfname, ' ');
                if (!p) continue;
                *p = '\0';
                if (descfile) fclose(descfile);
                return saveUuFile(inpart, tmpfname, tmppart, tmpnparts,
                                  (char *)0);
            }
        }
        else if (!strncmp(buf, "POST V", 6)) {
            /*
             * "POST Vd.d.d F (Part N/M)"
             */
            p = strchr(buf+6, ' ');
            if (!p) continue;
            tmpfname = p+1;
            p = strchr(tmpfname, ' ');
            if (!p || strncmp(p, " (Part ", 7) != 0) continue;
            *p = '\0';
            p += 7;
            tmppart = 0;
            while (isdigit(*p)) tmppart = tmppart*10 + *p++ - '0';
            if (tmppart == 0 || *p++ != '/') continue;
            tmpnparts = 0;
            while (isdigit(*p)) tmpnparts = tmpnparts*10 + *p++ - '0';
            if (tmppart > tmpnparts || *p != ')') continue;
            if (descfile) fclose(descfile);
            return saveUuFile(inpart, tmpfname, tmppart, tmpnparts, (char *)0);
        }
        else if (!strncmp(buf, "File: ", 6)) {
            /*
             * "File: F -- part N of M -- ...
             */
            tmpfname = buf+6;
            p = strchr(tmpfname, ' ');
            if (!p || strncmp(p, " -- part ", 9) != 0) continue;
            *p = '\0';
            p += 9;
            tmppart = 0;
            while (isdigit(*p)) tmppart = tmppart*10 + *p++ - '0';
            if (tmppart == 0 || strncmp(p, " of ", 4) != 0) continue;
            p += 4;
            tmpnparts = 0;
            while (isdigit(*p)) tmpnparts = tmpnparts*10 + *p++ - '0';
            if (tmppart > tmpnparts || strncmp(p, " -- ", 4) != 0) continue;
            if (descfile) fclose(descfile);
            return saveUuFile(inpart, tmpfname, tmppart, tmpnparts, (char *)0);
        }
        else if (!strncmp(buf, "[Section: ", 10)) {
            /*
             * "[Section: N/M  File: F ..."
             */
            tmppart = 0;
            for (p = buf+10; isdigit(*p); p++) tmppart = tmppart*10 + *p - '0';
            if (tmppart == 0) continue;
            tmpnparts = 0;
            for (p++; isdigit(*p); p++) {
                tmpnparts = tmpnparts*10 + *p - '0';
            }
            while (*p && isspace(*p)) p++;
            if (tmppart > tmpnparts || strncmp(p, "File: ", 6) != 0) {
                continue;
            }
            tmpfname = p+6;
            p = strchr(tmpfname, ' ');
            if (!p) continue;
            *p = '\0';
            if (descfile) fclose(descfile);
            return saveUuFile(inpart, tmpfname, tmppart, tmpnparts, (char *)0);
        }
        else if (*buf == '[') {
            /*
             * "[F ... - part N of M]"
             * (usual BinHex practice)
             */
            tmpfname = buf+1;
            p = strchr(tmpfname, ' ');
            if (!p) continue;
            *p++ = '\0';
            while (p && strncmp(p, "- part ", 7) != 0) {
                p = strchr(p+1, '-');
            }
            if (!p) continue;
            p += 7;
            tmppart = 0;
            while (isdigit(*p)) tmppart = tmppart*10 + *p++ - '0';
            if (tmppart == 0 || strncmp(p, " of ", 4) != 0) continue;
            p += 4;
            tmpnparts = 0;
            while (isdigit(*p)) tmpnparts = tmpnparts*10 + *p++ - '0';
            if (tmppart > tmpnparts || *p != ']') continue;
            if (descfile) fclose(descfile);
            return saveUuFile(inpart, tmpfname, tmppart, tmpnparts, (char *)0);
        }
        else if (fname && part > 0 && nparts > 0 && part <= nparts &&
                 (!strncmp(buf, "BEGIN", 5) ||
                  !strncmp(buf, "--- BEGIN ---", 12) ||
                  (buf[0] == 'M' && strlen(buf) == UULENGTH))) {
            /*
             * Found the start of a section of uuencoded data
             * and have the part N of M information.
             */
            if (descfile) fclose(descfile);
            return saveUuFile(inpart, fname, part, nparts, buf);
        }
        else if (!strncasecmp(buf, "x-file-name: ", 13)) {
            for (p = buf + 13; *p && !isspace(*p); p++);
            *p = '\0';
            strncpy(fnamebuf, buf+13, sizeof(fnamebuf)-1);
            fnamebuf[sizeof(fnamebuf)-1] = '\0';
            fname = fnamebuf;
            continue;
        }
        else if (!strncasecmp(buf, "x-part: ", 8)) {
            tmppart = atoi(buf+8);
            if (tmppart > 0) part = tmppart;
            continue;
        }
        else if (!strncasecmp(buf, "x-part-total: ", 14)) {
            tmpnparts = atoi(buf+14);
            if (tmpnparts > 0) nparts = tmpnparts;
            continue;
        }
        else if (part == 1 && fname && !descfile &&
                 !strncasecmp(buf, "x-file-desc: ", 13)) {
            if (descfile = startDescFile(fname)) {
                fputs(buf+13, descfile);
                fclose(descfile);
                descfile = 0;
            }
            continue;
        }
        else if (!strcmp(buf,
                         "(This file must be converted with BinHex 4.0)\n")) {
            if (descfile) fclose(descfile);
            return os_binhex(inpart, 1, 1);
        }
        else if (!strncasecmp(buf, "content-", 8)) {
            /*
             * HEURISTIC: If we see something that looks like a content-*
             * header, push it back and call the message parser.
             */
            p = buf+8;
            /* Check to see if header's field-name is syntactically valid */
            while (*p) {
                if (*p == ':' || *p <= ' ' || *p >= '\177') break;
                p++;
            }
            if (*p == ':') {
                part_ungets(buf, inpart);
                if (descfile) fclose(descfile);
                return handleMessage(inpart, "text/plain", 0, extractText);
            }
        }
        if (buf[0] == '-' && buf[1] == '-') {
            /*
             * Heuristic: If we see something that looks like a
             * multipart boundary, followed by something that looks
             * like a header, push them back and parse as a multipart.
             */
            p = buf+2;
            while (*p) {
                if (!bchar[(unsigned char)*p]) break;
                p++;
            }
            if (*p != '\n') {
                /*
                 * We found an invalid boundary character.
                 * Move 'p' such that it will fail all subsequent checks.
                 */
                p = buf + 2;
            }
            /* Back up to ignore trailing whitespace */
            while (p > buf+2 && p[-1] == ' ') p--;

            /*
             * Check that boundary is within legal size limits
             * If so, peek at next line
             */
            if (p - buf > 2 && p - buf <= 72 &&
                part_gets(buf2, sizeof(buf2), inpart)) {
                boundary_end = p;
                p = buf2;
                /*
                 * Check to see if a syntactically valid header follows
                 * what looks to be a boundary.
                 *
                 * XXX: Unfortunately, we can't check for "Content-";
                 * it is syntactically valid to have a body-part
                 * header that doesn't start with that and ZMail
                 * takes advantage of that.  If this heuristic starts
                 * causing problems, we could keep looking ahead until
                 * we find a "Content-" header or find something that's
                 * not a header.
                 */
                while (*p) {
                    if (*p == ':' || *p <= ' ' || *p >= '\177') break;
                    p++;
                }
                
                /* Push back the lookahead line */
                part_ungets(buf2, inpart);

                if (p > buf2 && *p == ':') {
                    /* Push back the boundary */
                    part_ungets(buf, inpart);

                    /*
                     * Generate and push back a header to get us into
                     * the multipart parser.
                     */
                    *boundary_end = '\0';
                    sprintf(buf2,
                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n",
                            buf+2);
                    part_ungets(buf2, inpart);
                    
                    if (descfile) fclose(descfile);
                    return handleMessage(inpart, "text/plain", 0, extractText);
                }
            }
        }

        /*
         * Save useful-looking text that is before a "part 1 of N"
         * in a description file.
         */
        if (wantdescfile && !descfile) {
            for (p = buf; *p && isspace(*p); p++);
            if (*p) {
                if (!strncasecmp(p, "x-", 2)) {
                    /*
                     * Check for "X-foobar:"
                     * If so, there probably will be a "X-File-Desc:" line
                     * later, so ignore this line.
                     */
                    while (*p != ':' && *p > ' ' && *p < '\177') p++;
                    if (*p == ':') continue;
                }
                if (!descEnd(buf) && (descfile = startDescFile(fname))) {
                    fputs(buf, descfile);
                }
                wantdescfile = 0;
            }
        }
        else if (descfile) {
            if (descEnd(buf)) {
                fclose(descfile);
                descfile = 0;
            }
            else {
                fputs(buf, descfile);
            }
        }
    }   

    if (descfile) fclose(descfile);
    return 0;
}

/*
 * Handle a split-uuencode part
 * If nparts is 0, then look for an "end" line to detect the last part.
 * If fname is null, then we are attempting to decode a single-part message.
 * If firstline is non-null, it is written as the first line of the saved part
 */
int
saveUuFile(struct part *inpart, char *fname, int part, int nparts, char *firstline)
{
    char buf[1024];
    char *dir;
    FILE *partfile;

    if (fname) {
        sprintf(buf, "Saving part %d ", part);
        if (nparts) sprintf(buf+strlen(buf), "of %d ", nparts);
        strcat(buf, fname);
        chat(buf);
    }
    else fname = "unknown";

    /* Create directory to store parts and copy this part there. */
    dir = os_idtodir(fname);
    if (!dir) return 1;
    sprintf(buf, "%s%d", dir, part);
    partfile = os_createnewfile(buf);
        if (!partfile) {
        os_perror(buf);
        return 1;
    }
    if (firstline) fputs(firstline, partfile);
    while (part_gets(buf, sizeof(buf), inpart)) {
        fputs(buf, partfile);
        if (nparts == 0 && strcmp(buf, "end\n") == 0) {
            /* This is the last part. Remember the fact */
            nparts = part;
            fclose(partfile);
            sprintf(buf, "%sCT", dir);
            partfile = os_createnewfile(buf);
            if (!partfile) {
                os_perror(buf);
            }
            else {
                fprintf(partfile, "%d\n", nparts);
            }
            break;
        }
    }
    fclose(partfile);

    /* Retrieve any previously saved number of the last part */
    if (nparts == 0) {
        sprintf(buf, "%sCT", dir);
        if (partfile = fopen(buf, "r")) {
            if (fgets(buf, sizeof(buf), partfile)) {
                nparts = atoi(buf);
                if (nparts < 0) nparts = 0;
            }
            fclose(partfile);
        }
    }

    if (nparts == 0) return 0;

    /* Check to see if we have all parts.  Start from the highest numbers
     * as we are more likely not to have them.
     */
    for (part = nparts; part; part--) {
        sprintf(buf, "%s%d", dir, part);
        partfile = fopen(buf, "r");
        if (partfile) {
            fclose(partfile);
        }
        else {
            return 0;
        }
    }

    return uudecodefiles(dir, nparts);
}

/*
 * Parse a Subject: header, looking for clues with which to decode
 * split-uuencoded data.
 */
int
parseSubject(char *subject, char **fnamep, int *partp, int *npartsp)
{
    char *scan, *bak, *start;
    int part = -1, nparts = 0, hasdot = 0;

    /* No subject header */
    if (!subject) return 1;

    /* Skip leading whitespace and other garbage */
    scan = subject;
    while (*scan == ' ' || *scan == '\t' || *scan == '-') scan++;
    if (!strncasecmp(scan, "repost", 6)) {
        for (scan += 6; *scan == ' ' || *scan == '\t'
             || *scan == ':' || *scan == '-'; scan++);
    }

    /* Replies aren't usually data */
    if (!strncasecmp(scan, "re:", 3)) return 1;

    /* Get filename */

    /* Grab the first filename-like string.  Explicitly ignore strings with
     * prefix "v<digit>" ending in ":", since that is a popular volume/issue
     * representation syntax
     */
    do {
        while (*scan != '\n' && !isalnum(*scan) && *scan != '_') ++scan;
        *fnamep = start = scan;
        while (isalnum(*scan) || *scan == '-' || *scan == '+' || *scan == '&'
               || *scan == '_' || *scan == '.') {
            if (*scan++ == '.') hasdot = 1;
        }
        if (!*scan || *scan == '\n') return 1;
    } while (start == scan
             || (start[0] == 'v' && isdigit(start[1]) && *scan == ':'));
    *scan++ = '\0';
    
    /* Try looking for a filename with a "." in it later in the subject line.
     * Exclude <digit>.<digit>, since that is usually a version number.
     */
    if (!hasdot) {
        while (*(start = scan) != '\0' && *scan != '\n') {
            while (isspace(*start)) ++start;
            for (scan = start; isalnum(*scan) || *scan == '-' || *scan == '+'
                 || *scan == '&' || *scan == '_' || *scan == '.'; ++scan) {
                if (*scan == '.' && 
                    (!isdigit(scan[-1]) || !isdigit(scan[1]))) {
                    hasdot = 1;
                }
            }
            if (hasdot && scan > start) {
                *fnamep = start;
                *scan++ = '\0';
                break;
            }
            while (*scan && *scan != '\n' && !isalnum(*scan)) ++scan;
        }
        scan = *fnamep + strlen(*fnamep) + 1;
    }

    /* Get part number */
    while (*scan && *scan != '\n') {
        /* skip over versioning */
        if (*scan == 'v' && isdigit(scan[1])) {
            ++scan;
            while (isdigit(*scan)) ++scan;
        }
        /* look for "1/6" or "1 / 6" or "1 of 6" or "1-of-6" or "1o6" */
        if (isdigit(*scan) &&
            (scan[1] == '/'
             || (scan[1] == ' ' && scan[2] == '/')
             || (scan[1] == ' ' && scan[2] == 'o' && scan[3] == 'f')
             || (scan[1] == '-' && scan[2] == 'o' && scan[3] == 'f')
             || (scan[1] == 'o' && isdigit(scan[2])))) {
            while (isdigit(scan[-1])) scan--;
            part = 0;
            while (isdigit(*scan)) {
                part = part * 10 + *scan++ - '0';
            }
            while (*scan != '\0' && *scan != '\n' && !isdigit(*scan)) scan++;
            if (isdigit(*scan)) {
                nparts = 0;
                while (isdigit(*scan)) {
                    nparts = nparts * 10 + *scan++ - '0';
                }
            }
            break;
        }

        /* look for "6 parts" or "part 1" */
        if (!strncasecmp("part", scan, 4)) {
            if (scan[4] == 's') {
                for (bak = scan; bak >= subject && !isdigit(*bak); bak--);
                if (bak > subject) {
                    while (bak > subject && isdigit(bak[-1])) bak--;
                    nparts = 0;
                    while (isdigit(*bak)) {
                        nparts = nparts * 10 + *bak++ - '0';
                    }
                }
            } else {
                while (*scan && *scan != '\n' && !isdigit(*scan)) scan++;
                bak = scan - 1;
                if (isdigit(*scan)) {
                    part = 0;
                    do {
                        part = part * 10 + *scan++ - '0';
                    } while (isdigit(*scan));
                }
                scan = bak;
            }
        }
        scan++;
    }

    if (nparts == 0 || part == -1 || part > nparts) return 1;
    *partp = part;
    *npartsp = nparts;
    return 0;
}

/*
 * Return nonzero if 'line' should mark the end of a part-1 description
 */
int
descEnd(char *line)
{
    return !strncmp(line, "---", 3) ||
        !strncmp(line, "#!", 2) ||
        !strncasecmp(line, "part=", 5) ||
        !strncasecmp(line, "begin", 5);
}

/*
 * Open and return a file pointer for a description file for 'fname'.
 * If a description file for 'fname' already exists, or if there is an
 * error, return a null pointer.
 */
static FILE *startDescFile(char *fname)
{
    char buf[1024];
    char *dir;
    FILE *descfile;

    /* Create directory to store parts and copy this part there. */
    dir = os_idtodir(fname);
    if (!dir) return 0;
    sprintf(buf, "%s0", dir);

    /* See if part 0 already exists, return failure if so */
    descfile = fopen(buf, "r");
    if (descfile) {
        fclose(descfile);
        return 0;
    }

    descfile = os_createnewfile(buf);
    if (!descfile) {
        os_perror(buf);
        return 0;
    }
    return descfile;
}

/*
 * Decode the uuencoded file that is in 'nparts' pieces in 'dir'.
 */
int
uudecodefiles(char *dir, int nparts)
{
    int part;
    enum {st_start, st_inactive, st_decode, st_nextlast, st_last,
            st_binhex} state;
    FILE *infile;
    FILE *outfile = NULL;
    struct part *inpart;
    char buf[1024];
    char lastline[UULENGTH+1];
    char *fname, *p;
    char *contentType = "application/octet-stream";
    int line_length = 0;

    /* If a part 0, copy to description filename */
    sprintf(buf, "%s0", dir);
    infile = fopen(buf, "r");
    if (infile) {
        outfile = os_createnewfile(TEMPFILENAME);
        if (outfile) {
            while (fgets(buf, sizeof(buf), infile)) {
                fputs(buf, outfile);
            }
            fclose(outfile);
            outfile = NULL;
        }
        fclose(infile);
        sprintf(buf, "%s0", dir);
        remove(buf);
    }

    state = st_start;

    /* Handle each part in order */
    for (part = 1; part <= nparts; part++) {
        sprintf(buf, "%s%d", dir, part);
        infile = fopen(buf, "r");
        if (!infile) {
            os_perror(buf);
            if (outfile) fclose(outfile);
            remove(TEMPFILENAME);
            return 1;
        }

        while (fgets(buf, sizeof(buf), infile)) {
            switch (state) {
            case st_start:      /* Looking for start of uuencoded
                                 *  or binhex'ed file */
                if (!strcmp(buf,
                        "(This file must be converted with BinHex 4.0)\n")) {
                    state = st_binhex;
                    inpart = part_init(infile);
                    os_binhex(inpart, part, nparts);
                    part_close(inpart);
                    goto endbinhex;
                }
                if (strncmp(buf, "begin ", 6)) break;
                /* skip mode */
                p = buf + 6;
                while (*p && !isspace(*p)) p++;
                while (*p && isspace(*p)) p++;
                fname = p;
                while (*p && !isspace(*p)) p++;
                *p = '\0';
                if (!*fname) return 1;

                /* Guess the content-type of common filename extensions */
                if (p = strrchr(fname, '.')) {
                    if (!strcasecmp(p, ".gif")) contentType = "image/gif";
                    if (!strcasecmp(p, ".jpg")) contentType = "image/jpeg";
                    if (!strcasecmp(p, ".jpeg")) contentType = "image/jpeg";
                    if (!strcasecmp(p, ".mpg")) contentType = "video/mpeg";
                    if (!strcasecmp(p, ".mpeg")) contentType = "video/mpeg";
                }

                /* Create output file and start decoding */
                outfile = os_newtypedfile(fname, contentType, FILE_BINARY,
                                          (params) 0);
                if (!outfile) {
                    fclose(infile);
                    return 1;
                }
                state = st_decode;
                break;

            case st_inactive:   /* Looking for uuencoded data to resume */
                if (*buf != 'M' || strlen(buf) != line_length) {
                    if (*buf == 'B' && !strncmp(buf, "BEGIN", 5)) {
                        state = st_decode;
                    }
                    break;
                }
                state = st_decode;
                /* FALL THROUGH */
            case st_decode:     /* Decoding data */
                if (line_length == 0) line_length = strlen(buf);
                if (*buf == 'M' && strlen(buf) == line_length) {
                    uudecodeline(buf, outfile);
                    break;
                }
                if (strlen(buf) > line_length) {
                    state = st_inactive;
                    break;
                }
                /*
                 * May be on nearing end of file.
                 * Save this line in case we are.
                 */
                strcpy(lastline, buf);
                if (*buf == ' ' || *buf == '`') {
                    state = st_last;
                }
                else {
                    state = st_nextlast;
                }
                break;

            case st_nextlast:   /* May be nearing end of file */
                if (*buf == ' ' || *buf == '`') {
                    state = st_last;
                }
                else {
                    state = st_inactive;
                }
                break;

            case st_last:       /* Should be at end of file */
                if (!strncmp(buf, "end", 3) && isspace(buf[3])) {
                    /* Handle that last line we saved */
                    uudecodeline(lastline, outfile);
                    fclose(infile);
                    os_closetypedfile(outfile);
                    for (;part <= nparts; part++) {
                        sprintf(buf, "%s%d", dir, part);
                        remove(buf);
                    }
                    sprintf(buf, "%sCT", dir);
                    remove(buf);
                    os_donewithdir(dir);
                    return 0;
                }
                state = st_inactive;
                break;

            case st_binhex:
                if (strncmp(buf, "---", 3)) break;
                inpart = part_init(infile);
                os_binhex(inpart, part, nparts);
                part_close(inpart);
                goto endbinhex;
            }
        }
        if (state != st_binhex) state = st_inactive;
        fclose(infile);
    endbinhex:
        sprintf(buf, "%s%d", dir, part);
        remove(buf);
    }
    if (outfile) os_closetypedfile(outfile);
    if (state == st_binhex) os_binhex(0, 0, 0);
    sprintf(buf, "%sCT", dir);
    remove(buf);
    os_donewithdir(dir);
    return 0;
}

#define DEC(c)  (((c) - ' ') & 077)

/*
 * Decode a uuencoded line to 'outfile'
 */
int uudecodeline(char *line, FILE *outfile)
{
    int c, len;

    len = DEC(*line++);
    while (len) {
        c = DEC(*line) << 2 | DEC(line[1]) >> 4;
        putc(c, outfile);
        if (--len) {
            c = DEC(line[1]) << 4 | DEC(line[2]) >> 2;
            putc(c, outfile);
            if (--len) {
                c = DEC(line[2]) << 6 | DEC(line[3]);
                putc(c, outfile);
                len--;
            }
        }
        line += 4;
    }
    return;
}

    