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- /* $Id: uudecode.c,v 4.4.3.1 1992/02/01 03:09:32 sob PATCH_3 sob $
- *
- * $Log: uudecode.c,v $
- * Revision 4.4.3.1 1992/02/01 03:09:32 sob
- * Release 4.4 Patchlevel 3
- *
- * Revision 4.4.2.1 1991/12/01 18:05:42 sob
- * Patchlevel 2 changes
- *
- * Revision 4.4 1991/09/09 20:27:37 sob
- * release 4.4
- *
- *
- * Decode one or more uuencoded articles back to binary form.
- * Adapted to rn 4.4 by Stan Barber
- * Trn version created by Wayne Davison.
- * Adapted from the nn version by Kim Storm.
- * From the Berkeley original, modified by MSD, RDR, JPHD & WLS.
- */
- /*
- * This software is Copyright 1991 by Stan Barber.
- *
- * Permission is hereby granted to copy, reproduce, redistribute or otherwise
- * use this software as long as: there is no monetary profit gained
- * specifically from the use or reproduction of this software, it is not
- * sold, rented, traded or otherwise marketed, and this copyright notice is
- * included prominently in any copy made.
- *
- * The author make no claims as to the fitness or correctness of this software
- * for any use whatsoever, and it is provided as is. Any use of this software
- * is at the user's own risk.
- */
-
- #include "EXTERN.h"
- #include "common.h"
- #include "respond.h"
- #include "decode.h"
-
- #define MAXCHAR 256
- #define NORMLEN 64 /* allows for 84 encoded chars per line */
-
- #define SEQMAX 'z'
- #define SEQMIN 'a'
-
- static char seqc;
- static int first, secnd, check, numl;
-
- static char blank;
- static int chtbl[MAXCHAR], cdlen[NORMLEN + 3];
- static int state;
- static bool Xflag;
- static int expecting_part;
-
- static int decode_line ANSI((char *));
- static void inittbls ANSI((void));
- static void gettable ANSI((FILE *));
-
- #define NO_ADVANCE 0x10
-
- #define FIND_BEGIN 0x01
- #define AFTER_ERROR_FIND_BEGIN 0x02
- #define DECODE_TEXT 0x03
- #define SKIP_TRAILING (0x04 | NO_ADVANCE)
- #define SKIP_LEADING 0x05
- #define FOUND_END (0x06 | NO_ADVANCE)
- #define DECODE_ERROR (0x07 | NO_ADVANCE)
- #define OTHER_ERROR (0x08 | NO_ADVANCE)
- #define NEW_BEGIN (0x09 | NO_ADVANCE)
-
- void
- uud_start()
- {
- Xflag = FALSE;
- expecting_part = 0;
- seqc = SEQMAX;
- check = 1;
- first = 1;
- secnd = 0;
- state = FIND_BEGIN;
- }
-
- int
- uudecode(in)
- FILE *in;
- {
- int mode, onedone, lens;
- char buff[LBUFLEN];
- int counter; /** OS2-patch **/
-
- numl = onedone = 0;
-
- if (state == FIND_BEGIN)
- inittbls();
-
- /*
- * search for header or translation table line.
- */
-
- while ((state & NO_ADVANCE) || fgets(buff, sizeof buff, in) != Nullch) {
-
- /*** OS2: AAAAAAAAHHHHHHHHHHHH, ..... another problem with \r (^M)... **/
-
- for (counter = 0; counter <= strlen(buff); counter++)
- if ((buff[counter] == '\r') &&
- (buff[counter+1] == '\n')) {
- for (; buff[counter] != '\0'; counter++)
- buff[counter] = buff[counter+1];
- }
-
- numl++;
-
- switch (state) {
- case NEW_BEGIN:
- if (decode_fp != Nullfp) {
- if (expecting_part) {
- register int got_part = 0;
-
- if (strnEQ(buff + 6, "part ", 5)) {
- register char *bp;
-
- for (bp = buff + 11; islower(*bp); bp++)
- got_part = got_part * 26 + *bp - 'a';
- }
- if (expecting_part == got_part) {
- state = DECODE_TEXT;
- break;
- }
- printf("Expecting part %d; got part %d.\n",
- expecting_part + 1, got_part + 1);
- if (got_part) {
- state = SKIP_LEADING;
- return -1;
- }
- }
- decode_end();
- sleep(2);
- Xflag = FALSE;
- expecting_part = 0;
- }
- state = FIND_BEGIN;
- /* fall thru */
-
- case FIND_BEGIN:
- case AFTER_ERROR_FIND_BEGIN:
- if (strnEQ(buff, "table", 5)) {
- gettable(in);
- continue;
- }
-
- if (strnEQ(buff, "begin ", 6)
- || strnEQ(buff, "Xbegin ", 7)) {
- lens = strlen(buff)-1;
- if (buff[lens] == '\n')
- buff[lens] = '\0';
-
- if(sscanf(buff+6,"%o%s", &mode, decode_fname) != 2) {
- register char *bp = buff + 6;
-
- if (*bp == ' ')
- bp++;
- if (strnEQ(bp, "part ", 5)) {
- register int got_part = 0;
-
- for (bp = bp + 5; islower(*bp); bp++)
- got_part = got_part * 26 + *bp - 'a';
- printf("Expecting part 1; got part %d.\n",
- got_part + 1);
- return -1;
- }
- continue;
- }
-
- Xflag = (*buff == 'X');
-
- sprintf(decode_dest, "%s/%s", extractdest, decode_fname);
-
- if ((decode_fp = fos2open(decode_dest, FOPEN_WB)) == Nullfp) {
- printf("Cannot create file: %s\n", decode_dest);
- goto err;
- }
- chmod(decode_dest, mode);
- printf("Decoding: %s\n", decode_fname);
- state = DECODE_TEXT;
- }
- continue;
-
- case SKIP_LEADING:
- state = decode_line(buff);
- continue;
-
- case DECODE_TEXT:
- state = decode_line(buff);
- onedone = 1;
- continue;
-
- case FOUND_END:
- fclose(decode_fp);
- decode_fp = Nullfp;
- Xflag = FALSE;
- expecting_part = 0;
- state = FIND_BEGIN;
- printf("Done.\n");
- continue;
-
- case SKIP_TRAILING:
- printf("(Continued)\n");
- state = SKIP_LEADING;
- return 0;
-
- case DECODE_ERROR:
- state = SKIP_TRAILING;
- continue;
-
- case OTHER_ERROR:
- fclose(decode_fp);
- decode_fp = Nullfp;
- Xflag = FALSE;
- expecting_part = 0;
- state = AFTER_ERROR_FIND_BEGIN;
- goto err;
- }
- }
-
- if (onedone) {
- if (state == DECODE_TEXT) {
- printf("(Continued)\n");
- state = SKIP_LEADING;
- }
- return 0;
- }
-
- if (state == AFTER_ERROR_FIND_BEGIN)
- return -1;
- printf("Couldn't find anything to decode.\n");
-
- err:
- sleep(2);
- return -1;
- }
-
- /*
- * decode one line and write it out using decode_fp
- */
-
- static int
- decode_line(buff)
- char *buff;
- {
- char outl[LBUFLEN];
- register char *bp, *ut;
- register int *trtbl = chtbl;
- register int n;
- register int blen; /* binary length (from decoded file) */
- register int rlen; /* calculated input line length */
- register int len; /* actual input line length */
- register int dash; /* number of '-'s encountered on a line */
- /* If it's too high, we reject the line */
-
- # define REJECT(buf,rlen,len) /* Comment for makedepend to \
- ** ignore the backslash above */ \
- ((*buf == 'M' && len > rlen + 5) \
- || (*buf != 'M' && len != rlen && len != rlen+1) \
- || (strnEQ(buf, "BEGIN", 5)) \
- || (strnEQ(buf, "END", 3)))
-
- if (Xflag) {
- if (*buff == 'X')
- buff++;
- else
- *buff = 'x'; /* force a mis-parse of a non-x'ed line */
- }
- len = strlen(buff);
- if (--len <= 0)
- return state;
-
- buff[len] = '\0';
-
- /*
- * Get the binary line length.
- */
- if ((blen = trtbl[buff[0]]) < 0) {
- if (state == SKIP_LEADING) {
- if (strnEQ(buff, "begin ", 6))
- return NEW_BEGIN;
-
- return SKIP_LEADING;
- }
- /*
- * end of uuencoded file ?
- */
- if (strnEQ(buff, "end", 3))
- return FOUND_END;
-
- /*
- * end of current file ? : get next one.
- */
- if (strnEQ(buff, "include ", 8)) {
- for (bp = buff + 8; *bp; bp++) {
- if (bp[0] == '.' && bp[1] == 'u') {
- expecting_part = (bp[2] - 'a') * 26 + bp[3] - 'a';
- break;
- }
- }
- }
-
- /*
- * trailing garbage
- */
- return SKIP_TRAILING;
- }
-
- rlen = cdlen[blen];
- if (state == SKIP_LEADING && REJECT(buff,rlen,len))
- return SKIP_LEADING;
-
- /*
- * Is it the empty line before the end line ?
- */
- if (blen == 0)
- return state;
-
- if (REJECT(buff,rlen,len))
- return SKIP_TRAILING;
-
- /*
- * Pad with blanks.
- */
- for (bp = buff + len, n = rlen - len; --n >= 0; )
- *bp++ = blank;
-
- /*
- * Verify
- */
- for (n = rlen, bp = buff, dash = 0; --n >= 0; bp++) {
- if (trtbl[*bp] < 0) {
- if (state == SKIP_LEADING)
- return SKIP_LEADING;
- return DECODE_ERROR;
- }
- if (*bp == '-')
- dash++;
- }
- if (dash * 100 / rlen > 33) /* more than 1/3 dashes? */
- if (state == SKIP_LEADING)
- return SKIP_LEADING; /* -> reject */
- else
- return SKIP_TRAILING;
-
- /*
- * Check for uuencodes that append a 'z' to each line....
- */
- if (check)
- if (secnd) {
- secnd = 0;
- if (buff[rlen] == SEQMAX)
- check = 0;
- } else if (first) {
- first = 0;
- secnd = 1;
- if (buff[rlen] != SEQMAX)
- check = 0;
- }
-
- /*
- * There we check.
- */
- if (check) {
- if (buff[rlen] != seqc) {
- if (state == SKIP_LEADING)
- return SKIP_LEADING;
- return DECODE_ERROR;
- }
-
- if (--seqc < SEQMIN)
- seqc = SEQMAX;
- }
-
- /*
- * output a group of 3 bytes (4 input characters).
- * the input chars are pointed to by p, they are to
- * be output to file f. blen is used to tell us not to
- * output all of them at the end of the file.
- */
- ut = outl;
- n = blen;
- bp = &buff[1];
- while (--n >= 0) {
- *(ut++) = trtbl[*bp] << 2 | trtbl[bp[1]] >> 4;
- if (n > 0) {
- *(ut++) = (trtbl[bp[1]] << 4) | (trtbl[bp[2]] >> 2);
- n--;
- }
- if (n > 0) {
- *(ut++) = trtbl[bp[2]] << 6 | trtbl[bp[3]];
- n--;
- }
- bp += 4;
- }
- if (fwrite(outl, 1, blen, decode_fp) <= 0) {
- printf("Error on writing decoded file\n");
- return OTHER_ERROR;
- }
-
- return DECODE_TEXT;
- }
-
-
-
- /*
- * Install the table in memory for later use.
- */
- static void
- inittbls()
- {
- register int i, j;
-
- /*
- * Set up the default translation table.
- */
- for (i = 0; i < ' '; i++)
- chtbl[i] = -1;
- for (i = ' ', j = 0; i < ' ' + 64; i++, j++)
- chtbl[i] = j;
- for (i = ' ' + 64; i < MAXCHAR; i++)
- chtbl[i] = -1;
- chtbl['`'] = chtbl[' ']; /* common mutation */
- chtbl['~'] = chtbl['^']; /* another common mutation */
- blank = ' ';
- /*
- * set up the line length table, to avoid computing lotsa * and / ...
- */
- cdlen[0] = 1;
- for (i = 1, j = 5; i <= NORMLEN; i += 3, j += 4)
- cdlen[i] = (cdlen[i + 1] = (cdlen[i + 2] = j));
- }
-
- static void
- gettable(in)
- FILE *in;
- {
- char buff[LBUFLEN];
- register int c, n = 0;
- register char *cpt;
- int counter; /*** OS2-patch **/
-
- for (c = 0; c < MAXCHAR; c++)
- chtbl[c] = -1;
-
- for (;;) {
- if (fgets(buff, sizeof buff, in) == Nullch) {
- printf("EOF while in translation table.\n");
- return;
- }
-
- /*** OS2: AAAAAAAAHHHHHHHHHHHH, ..... another problem with \r (^M)... **/
-
- for (counter = 0; counter <= strlen(buff); counter++)
- if ((buff[counter] == '\r') &&
- (buff[counter+1] == '\n')) {
- for (; buff[counter] != '\0'; counter++)
- buff[counter] = buff[counter+1];
- }
-
- numl++;
- if (strnEQ(buff, "begin", 5)) {
- printf("Incomplete translation table.\n");
- return;
- }
- cpt = buff + strlen(buff) - 1;
- *cpt = ' ';
- while (*cpt == ' ') {
- *cpt = 0;
- cpt--;
- }
- cpt = buff;
- while (c = *cpt) {
- if (chtbl[c] != -1) {
- printf("Duplicate char in translation table.\n");
- return;
- }
- if (n == 0)
- blank = c;
- chtbl[c] = n++;
- if (n >= 64)
- return;
- cpt++;
- }
- }
- }
-
-