/* * This file is part of uudeview, the simple and friendly multi-part multi- * file uudecoder program (c) 1994 by Frank Pilhofer. The author may be * contacted by his email address, fp@informatik.uni-frankfurt.de * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ /* * These are the functions that are responsible for decoding. The * original idea is from a freeware utility called "uunconc", and * few lines of this code may still bear a remote resemblance to * its code. If you are the author or know him, contact me. * This program could only decode one multi-part, uuencoded file * where the parts were in order. Base64, XX and BinHex decoding, * support for multi-files and part-ordering covered by myself. **/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef SYSTEM_WINDLL #include #endif #ifdef SYSTEM_OS2 #include #endif #include #include #ifdef STDC_HEADERS #include #include #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_ERRNO_H #include #endif #include #include #include #include char * uunconc_id = "$Id$"; /* for braindead systems */ #ifndef SEEK_SET #ifdef L_BEGIN #define SEEK_SET L_BEGIN #else #define SEEK_SET 0 #endif #endif /* * decoder states */ #define BEGIN (1) #define DATA (2) #define END (3) #define DONE (4) /* * mallocable areas */ char *uunconc_UUxlat; char *uunconc_UUxlen; char *uunconc_B64xlat; char *uunconc_XXxlat; char *uunconc_BHxlat; char *uunconc_save; /* * decoding translation tables and line length table */ static int * UUxlen; /* initialized in UUInitConc() */ static int * UUxlat; /* from the malloc'ed areas above */ static int * B64xlat; static int * XXxlat; static int * BHxlat; /* * buffer for decoding */ static char *save[3]; /* * mallocable areas */ char *uuncdl_fulline; char *uuncdp_oline; /* * Return information for QuickDecode */ static int uulboundary; /* * To prevent warnings when using a char as index into an array */ #define ACAST(s) ((int)(unsigned char)(s)) /* * Initialize decoding tables */ void UUInitConc (void) { int i, j; /* * Update pointers */ UUxlen = (int *) uunconc_UUxlen; UUxlat = (int *) uunconc_UUxlat; B64xlat = (int *) uunconc_B64xlat; XXxlat = (int *) uunconc_XXxlat; BHxlat = (int *) uunconc_BHxlat; save[0] = uunconc_save; save[1] = uunconc_save + 256; save[2] = uunconc_save + 512; /* prepare decoding translation table */ for(i = 0; i < 256; i++) UUxlat[i] = B64xlat[i] = XXxlat[i] = BHxlat[i] = -1; /* * At some time I received a file which used lowercase characters for * uuencoding. This shouldn't be, but let's accept it. Must take special * care that this doesn't break xxdecoding. This is giving me quite a * headache. If this one file hadn't been a Pocahontas picture, I might * have ignored it for good. */ for (i = ' ', j = 0; i < ' ' + 64; i++, j++) UUxlat[i] /* = UUxlat[i+64] */ = j; for (i = '`', j = 0; i < '`' + 32; i++, j++) UUxlat[i] = j; /* add special cases */ UUxlat['`'] = UUxlat[' ']; UUxlat['~'] = UUxlat['^']; /* prepare line length table */ UUxlen[0] = 1; for(i = 1, j = 5; i <= 60; i += 3, j += 4) UUxlen[i] = UUxlen[i+1] = UUxlen[i+2] = j; /* prepare other tables */ for (i=0; i<64; i++) { B64xlat[ACAST(B64EncodeTable[i])] = i; XXxlat [ACAST(XXEncodeTable [i])] = i; BHxlat [ACAST(BHEncodeTable [i])] = i; } } /* * Workaround for Netscape */ /* * Determines whether Netscape may have broken up a data line (by * inserting a newline). This only seems to happen after ") > ptr) return 2; } ptr = string + len; while (len && (*(ptr-1)=='\015' || *(ptr-1)=='\012')) { ptr--; len--; } if (len<3) return 0; if (*--ptr == ' ') ptr--; ptr--; if (_FP_strnicmp (ptr, "",4)). If the first expression * becomes true, the costly function isn't called :-) * * Since '<', '>', '&' might even be replaced by their html equivalents * in href strings, I'm now using two passes, the first one for & + co, * the second one for hrefs. */ int UUNetscapeCollapse (char *string) { char *p1=string, *p2=string; int res = 0; if (string==NULL) return 0; /* * First pass */ while (*p1) { if (*p1 == '&') { if (_FP_strnicmp (p1, "&", 5) == 0) { p1+=5; *p2++='&'; } else if (_FP_strnicmp (p1, "<", 4) == 0) { p1+=4; *p2++='<'; } else if (_FP_strnicmp (p1, ">", 4) == 0) { p1+=4; *p2++='>'; } else *p2++ = *p1++; res = 1; } else *p2++ = *p1++; } *p2 = '\0'; /* * Second pass */ p1 = p2 = string; while (*p1) { if (*p1 == '<') { if ((_FP_strnicmp (p1, "") != 0 || _FP_strstr (p1, "") != 0)) { while (*p1 && *p1!='>') p1++; if (*p1=='\0' || *(p1+1)!='<') return 0; p1++; while (*p1 && (*p1!='<' || _FP_strnicmp(p1,"",4)!=0)) { *p2++ = *p1++; } if (_FP_strnicmp(p1,"",4) != 0) return 0; p1+=4; res=1; } else *p2++ = *p1++; } else *p2++ = *p1++; } *p2 = '\0'; return res; } /* * The second parameter is 0 if we are still searching for encoded data, * otherwise it indicates the encoding we're using right now. If we're * still in the searching stage, we must be a little more strict in * deciding for or against encoding; there's too much plain text looking * like encoded data :-( */ int UUValidData (char *ptr, int encoding, int *bhflag) { int i=0, j, len=0, suspicious=0, flag=0; char *s = ptr; if ((s == NULL) || (*s & 0x80)) { return(0); /* bad string */ } while (*s && *s!='\012' && *s!='\015') { s++; len++; i++; } if (i == 0) return 0; switch (encoding) { case UU_ENCODED: goto _t_UU; case XX_ENCODED: goto _t_XX; case B64ENCODED: goto _t_B64; case BH_ENCODED: goto _t_Binhex; } _t_Binhex: /* Binhex Test */ len = i; s = ptr; /* * bhflag notes the state we're in. Within the data, it's 1. If we're * still looking for the initial :, it's 0 */ if (*bhflag == 0 && *s != ':') { if (encoding==BH_ENCODED) return 0; goto _t_B64; } else if (*bhflag == 0 /* *s == ':' */) { s++; len--; } while (len && BHxlat[ACAST(*s)] != -1) { len--; s++; } /* allow space characters at the end of the line if we are sure */ /* that this is Binhex encoded data or the line was long enough */ flag = (*s == ':') ? 0 : 1; if (*s == ':' && len>0) { s++; len--; } if (((i>=60 && len<=10) || encoding) && *s==' ') { while (len && *s==' ') { s++; len--; } } /* * BinHex data shall have exactly 64 characters (except the last * line). We ignore everything with less than 40 characters to * be flexible */ if (len != 0 || (flag && i < 40)) { if (encoding==BH_ENCODED) return 0; goto _t_B64; } *bhflag = flag; return BH_ENCODED; _t_B64: /* Base64 Test */ len = i; s = ptr; /* * Face it: there _are_ Base64 lines that are not a multiple of four * in length :-( * * if (len%4) * goto _t_UU; */ while (len--) { if ((*s & 0x80) || (B64xlat[ACAST(*s)] == -1 && *s != '=')) { /* allow space characters at the end of the line if we are sure */ /* that this is Base64 encoded data or the line was long enough */ if (((i>=60 && len<=10) || encoding) && *s++==' ') { while (*s==' ' && len) s++; if (len==0) return B64ENCODED; } if (encoding==B64ENCODED) return 0; goto _t_UU; } else if (*s == '=') { /* special case at end */ /* if we know this is B64encoded, allow spaces at end of line */ s++; if (*s=='=' && len>=1) { len--; s++; } if (encoding && len && *s==' ') { while (len && *s==' ') { s++; len--; } } if (len != 0) { if (encoding==B64ENCODED) return 0; goto _t_UU; } return B64ENCODED; } s++; } return B64ENCODED; _t_UU: len = i; s = ptr; if (UUxlat[ACAST(*s)] == -1) { /* uutest */ if (encoding==UU_ENCODED) return 0; goto _t_XX; } j = UUxlen[UUxlat[ACAST(*s)]]; if (len-1 == j) /* remove trailing character */ len--; if (len != j) { switch (UUxlat[ACAST(*s)]%3) { case 1: if (j-2 == len) j-=2; break; case 2: if (j-1 == len) j-=1; break; } } /* * some encoders are broken with respect to encoding the last line of * a file and produce extraoneous characters beyond the expected EOL * So were not too picky here about the last line, as long as it's longer * than necessary and shorter than the maximum * this tolerance broke the xxdecoding, because xxencoded data was * detected as being uuencoded :( so don't accept 'h' as first character * also, if the first character is lowercase, don't accept the line to * have space characters. the only encoder I've heard of which uses * lowercase characters at least accepts the special case of encoding * 0 as `. The strchr() shouldn't be too expensive here as it's only * evaluated if the first character is lowercase, which really shouldn't * be in uuencoded text. */ if (len != j && !(*ptr != 'M' && *ptr != 'h' && len > j && len <= UUxlen[UUxlat['M']])) { if (encoding==UU_ENCODED) return 0; goto _t_XX; /* bad length */ } if (len != j || islower (*ptr)) { /* * if we are not in a 'uuencoded' state, don't allow the line to have * space characters at all. if we know we _are_ decoding uuencoded * data, the rest of the line, beyond the length of encoded data, may * have spaces. */ if (encoding != UU_ENCODED) if (strchr (ptr, ' ') != NULL) goto _t_XX; /* suspicious = 1; we're careful here REMOVED 0.4.15 __FP__ */ len = j; } while (len--) { if ((*s & 0x80) || UUxlat[ACAST(*s++)] < 0) { if (encoding==UU_ENCODED) return 0; goto _t_XX; /* bad code character */ } if (*s == ' ' && suspicious) { if (encoding==UU_ENCODED) return 0; goto _t_XX; /* this line looks _too_ suspicious */ } } return UU_ENCODED; /* data is valid */ _t_XX: /* XX Test */ len = i; s = ptr; if (XXxlat[ACAST(*s)] == -1) return 0; j = UUxlen[XXxlat[ACAST(*s)]]; /* Same line length table as UUencoding */ if (len-1 == j) /* remove trailing character */ len--; if (len != j) switch (UUxlat[ACAST(*s)]%3) { case 1: if (j-2 == len) j-=2; break; case 2: if (j-1 == len) j-=1; break; } /* * some encoders are broken with respect to encoding the last line of * a file and produce extraoneous characters beyond the expected EOL * So were not too picky here about the last line, as long as it's longer * than necessary and shorter than the maximum */ if (len != j && !(*ptr != 'h' && len > j && len <= UUxlen[UUxlat['h']])) return 0; /* bad length */ while(len--) { if((*s & 0x80) || XXxlat[ACAST(*s++)] < 0) { return 0; /* bad code character */ } } return XX_ENCODED; /* data is valid */ } /* * This function may be called upon a line that does not look like * valid encoding on first sight, but might be erroneously encoded * data from Netscape, Lynx or MS Exchange. We might need to read * a new line from the stream, which is why we need the FILE. * Returns the type of encoded data if successful or 0 otherwise. */ int UURepairData (FILE *datei, char *line, int encoding, int *bhflag) { int nflag, vflag=0, safety=42; char *ptr; nflag = UUBrokenByNetscape (line); while (vflag == 0 && nflag && safety--) { if (nflag == 1) { /* need next line to repair */ ptr = line + strlen (line); while (ptr>line && (*(ptr-1)=='\015' || *(ptr-1)=='\012')) ptr--; if (_FP_fgets (ptr, 255-(ptr-line), datei) == NULL) break; } else { /* don't need next line to repair */ } if (UUNetscapeCollapse (line)) { if ((vflag = UUValidData (line, encoding, bhflag)) == 0) nflag = UUBrokenByNetscape (line); } else nflag = 0; } /* * Sometimes, a line is garbled even without it being split into * the next line. Then we try this in our despair */ if (vflag == 0) { if (UUNetscapeCollapse (line)) vflag = UUValidData (line, encoding, bhflag); } /* * If this line looks uuencoded, but the line is one character short * of a valid line, it was probably broken by MS Exchange. According * to my test cases, there is at most one space character missing; * there are never two spaces together. * If adding a space character helps making this line uuencoded, do * it! */ if (vflag == 0) { ptr = line + strlen(line); while (ptr>line && (*(ptr-1)=='\012' || *(ptr-1)=='\015')) { ptr--; } *ptr++ = ' '; *ptr-- = '\0'; if ((vflag = UUValidData (line, encoding, bhflag)) != UU_ENCODED) { *ptr = '\0'; vflag = 0; } } return vflag; } /* * Decode a single encoded line using method */ size_t UUDecodeLine (char *s, char *d, int method) { int i, j, c, cc, count=0, z1, z2, z3, z4; static int leftover=0; int *table; /* * for re-initialization */ if (s == NULL || d == NULL) { leftover = 0; return 0; } /* * To shut up gcc -Wall */ z1 = z2 = z3 = z4 = 0; if (method == UU_ENCODED || method == XX_ENCODED) { if (method == UU_ENCODED) table = UUxlat; else table = XXxlat; i = table [ACAST(*s++)]; j = UUxlen[i] - 1; while(j > 0) { c = table[ACAST(*s++)] << 2; cc = table[ACAST(*s++)]; c |= (cc >> 4); if(i-- > 0) d[count++] = c; cc <<= 4; c = table[ACAST(*s++)]; cc |= (c >> 2); if(i-- > 0) d[count++] = cc; c <<= 6; c |= table[ACAST(*s++)]; if(i-- > 0) d[count++] = c; j -= 4; } } else if (method == B64ENCODED) { if (leftover) { strcpy (uuncdl_fulline+leftover, s); leftover = 0; s = uuncdl_fulline; } while ((z1 = B64xlat[ACAST(*s)]) != -1) { if ((z2 = B64xlat[ACAST(*(s+1))]) == -1) break; if ((z3 = B64xlat[ACAST(*(s+2))]) == -1) break; if ((z4 = B64xlat[ACAST(*(s+3))]) == -1) break; d[count++] = (z1 << 2) | (z2 >> 4); d[count++] = (z2 << 4) | (z3 >> 2); d[count++] = (z3 << 6) | (z4); s += 4; } if (z1 != -1 && z2 != -1 && *(s+2) == '=') { d[count++] = (z1 << 2) | (z2 >> 4); s+=2; } else if (z1 != -1 && z2 != -1 && z3 != -1 && *(s+3) == '=') { d[count++] = (z1 << 2) | (z2 >> 4); d[count++] = (z2 << 4) | (z3 >> 2); s+=3; } while (B64xlat[ACAST(*s)] != -1) uuncdl_fulline[leftover++] = *s++; } else if (method == BH_ENCODED) { if (leftover) { strcpy (uuncdl_fulline+leftover, s); leftover = 0; s = uuncdl_fulline; } else if (*s == ':') s++; while ((z1 = BHxlat[ACAST(*s)]) != -1) { if ((z2 = BHxlat[ACAST(*(s+1))]) == -1) break; if ((z3 = BHxlat[ACAST(*(s+2))]) == -1) break; if ((z4 = BHxlat[ACAST(*(s+3))]) == -1) break; d[count++] = (z1 << 2) | (z2 >> 4); d[count++] = (z2 << 4) | (z3 >> 2); d[count++] = (z3 << 6) | (z4); s += 4; } if (z1 != -1 && z2 != -1 && *(s+2) == ':') { d[count++] = (z1 << 2) | (z2 >> 4); s+=2; } else if (z1 != -1 && z2 != -1 && z3 != -1 && *(s+3) == ':') { d[count++] = (z1 << 2) | (z2 >> 4); d[count++] = (z2 << 4) | (z3 >> 2); s+=3; } while (BHxlat[ACAST(*s)] != -1) uuncdl_fulline[leftover++] = *s++; } return count; } /* * ``Decode'' Quoted-Printable text */ int UUDecodeQP (FILE *datain, FILE *dataout, int *state, long maxpos, int method, int flags, char *boundary) { char *line=uugen_inbuffer, *p1, *p2; int val; uulboundary = -1; while (!feof (datain) && (ftell(datain)line && (*(ptr-1) == '\012' || *(ptr-1) == '\015')) ptr--; /* * If the part ends directly after this line, the data does not end * with a linebreak. Or, as the docs put it, "the CRLF preceding the * encapsulation line is conceptually attached to the boundary. * So if the part ends here, don't print a line break" */ if ((*ptr == '\012' || *ptr == '\015') && (!feof (datain) && (ftell(datain) 5) tf = tc = 0; vlc = 0; continue; } /* * Busy Polls */ if (UUBUSYPOLL(ftell(datain)-progress.foffset,progress.fsize)) { UUMessage (uunconc_id, __LINE__, UUMSG_NOTE, uustring (S_DECODE_CANCEL)); return UURET_CANCEL; } /* * try to make sense of data */ line[255] = '\0'; /* For Safety of string functions */ count = 0; if (boundary && line[0]=='-' && line[1]=='-' && strncmp (line+2, boundary, strlen (boundary)) == 0) { if (line[strlen(boundary)+2]=='-') uulboundary = 1; else uulboundary = 0; return UURET_OK; } /* * Use this pseudo-handling only if !FL_PROPER */ if ((flags&FL_PROPER) == 0) { if (strncmp (line, "BEGIN", 5) == 0 && _FP_strstr (line, "CUT HERE") && !tf) { /* I hate these lines */ tc = tf = vlc = 0; continue; } /* MIME body boundary */ if (line[0] == '-' && line[1] == '-' && method == B64ENCODED) { if ((haddata || tc) && (haddh || hadct)) { *state = DONE; vlc = 0; lc[0] = lc[1] = 0; continue; } hadct = 0; haddh = 1; continue; } if (_FP_strnicmp (line, "Content-Type", 12) == 0) hadct = 1; } if (*state == BEGIN) { if (strncmp (line, "begin ", 6) == 0 || _FP_strnicmp (line, "
begin ", 11) == 0) {    /* for LYNX */
	*state = DATA;
	continue;
      }
      else if (method == BH_ENCODED && line[0] == ':') {
	if (UUValidData (line, BH_ENCODED, &bhflag) == BH_ENCODED) {
	  bhflag = 0;
	  *state = DATA;
	}
	else
	  continue;
      }
      else
	continue;
      
      tc = tf = vlc = 0;
      lc[0] = lc[1] = 0;
    }
    else if ((*state == END) &&
	     (method == UU_ENCODED || method == XX_ENCODED)) {
      if (strncmp (line, "end", 3) == 0) {
	*state = DONE;
	break;
      }
    }
    if (*state == DATA || *state == END) {
      if (method==B64ENCODED && line[0]=='-' && line[1]=='-' && tc) {
	break;
      }

      if ((vflag = UUValidData (line, (tf)?method:0, &bhflag)) == 0)
	vflag = UURepairData (datain, line, (tf)?method:0, &bhflag);

      /*
       * correct XX/UUencoded lines that were declared Base64
       */

      if ((method == XX_ENCODED || method == UU_ENCODED) &&
	  vflag == B64ENCODED) {
	if (UUValidData (line, method, &bhflag) == method)
	  vflag = method;
      }

      if (vflag == method) {
	if (tf) {
	  count  = UUDecodeLine (line, oline, method);
	  vlc++; lc[1]++;
	}
	else if (tc == 3) {
	  count  = UUDecodeLine (save[0], oline,         method);
	  count += UUDecodeLine (save[1], oline + count, method);
	  count += UUDecodeLine (save[2], oline + count, method);
	  count += UUDecodeLine (line,    oline + count, method);
	  tf     = 1;
	  tc     = 0;

	  /*
	   * complain if we had one or two invalid lines amidst of
	   * correctly encoded data. This usually means that the
	   * file is in error
	   */

	  if (lc[1] > 10 && (lc[0] >= 1 && lc[0] <= 2) && !warning) {
	    UUMessage (uunconc_id, __LINE__, UUMSG_WARNING,
		       uustring (S_DATA_SUSPICIOUS));
	    warning=1;
	  }
	  lc[0] = 0;
	  lc[1] = 3;
	}
	else {
	  _FP_strncpy (save[tc++], line, 256);
	}
	if (method == UU_ENCODED)
	  *state = (line[0] == 'M') ? DATA : END;
	else if (method == XX_ENCODED)
	  *state = (line[0] == 'h') ? DATA : END;
	else if (method == B64ENCODED)
	  *state = (strchr (line, '=') == NULL) ? DATA : DONE;
	else if (method == BH_ENCODED)
	  *state = (!line[0] || strchr(line+1,':')==NULL)?DATA:DONE;
      }
      else {
	vlc = tf = tc = 0;
	haddh = 0;
	lc[0]++;
      }
    }
    else if (*state != DONE) {
      return UURET_NOEND;
    }
    if (count) {
      if (method == BH_ENCODED) {
	if (UUbhwrite (oline, 1, count, dataout) != count) {
	  UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		     uustring (S_WR_ERR_TEMP),
		     strerror (uu_errno = errno));
	  return UURET_IOERR;
	}
      }
      else if (fwrite (oline, 1, count, dataout) != count) {
	UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		   uustring (S_WR_ERR_TEMP),
		   strerror (uu_errno = errno));
	return UURET_IOERR;
      }
      haddata++;
      count = 0;
    }
  }

  if (*state  == DONE ||
      (*state == DATA && method == B64ENCODED &&
       vflag == B64ENCODED && (flags&FL_PROPER || haddh))) {
    for (tf=0; tfthisfile == NULL)
    return UURET_ILLVAL;

  if (data->state & UUFILE_TMPFILE)
    return UURET_OK;

  if (data->state & UUFILE_NODATA)
    return UURET_NODATA;

  if (data->state & UUFILE_NOBEGIN && !uu_desperate)
    return UURET_NODATA;

  if (data->uudet == QP_ENCODED || data->uudet == PT_ENCODED)
    mode = "wt";	/* open text files in text mode */
  else
    mode = "wb";	/* otherwise in binary          */

  if ((data->binfile = tempnam (NULL, "uu")) == NULL) {
    UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
	       uustring (S_NO_TEMP_NAME));
    return UURET_NOMEM;
  }

  if ((dataout = fopen (data->binfile, mode)) == NULL) {
    /*
     * we couldn't create a temporary file. Usually this means that TMP
     * and TEMP aren't set
     */
    UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
	       uustring (S_WR_ERR_TARGET),
	       data->binfile, strerror (uu_errno = errno));
    _FP_free (data->binfile);
    data->binfile = NULL;
    uu_errno = errno;
    return UURET_IOERR;
  }
  /*
   * we don't have begin lines in Base64 or plain text files.
   */
  if (data->uudet == B64ENCODED || data->uudet == QP_ENCODED ||
      data->uudet == PT_ENCODED)
    state = DATA;

  /*
   * If we know that the file does not have a begin, we simulate
   * it in desperate mode
   */

  if ((data->state & UUFILE_NOBEGIN) && uu_desperate)
    state = DATA;

  (void) UUDecodeLine (NULL, NULL, 0);                   /* init */
  (void) UUbhwrite    (NULL, 0, 0, NULL);                /* dito */
  (void) UUDecodePart (NULL, NULL, NULL, 0, 0, 0, NULL); /* yep  */

  /*
   * initialize progress information
   */
  progress.action = 0;
  if (data->filename != NULL) {
    _FP_strncpy (progress.curfile,
		 (strlen(data->filename)>255)?
		 (data->filename+strlen(data->filename)-255):data->filename,
		 256);
  }
  else {
    _FP_strncpy (progress.curfile,
		 (strlen(data->binfile)>255)?
		 (data->binfile+strlen(data->binfile)-255):data->binfile,
		 256);
  }
  progress.partno   =  0;
  progress.numparts =  0;
  progress.fsize    = -1;
  progress.percent  =  0;
  progress.action   =  UUACT_DECODING;

  iter = data->thisfile;
  while (iter) {
    progress.numparts = (iter->partno)?iter->partno:1;
    iter = iter->NEXT;
  }
  
  /*
   * let's rock!
   */

  iter = data->thisfile;
  while (iter) {
    if (part != -1 && iter->partno != part+1)
      break;
    else
      part = iter->partno;

    if (iter->data->sfname == NULL) {
      iter = iter->NEXT;
      continue;
    }

    /*
     * call our FileCallback to retrieve the file
     */

    if (uu_FileCallback) {
      if ((res = (*uu_FileCallback) (uu_FileCBArg, iter->data->sfname,
				     uugen_fnbuffer, 1)) != UURET_OK)
	break;
      if ((datain = fopen (uugen_fnbuffer, "rb")) == NULL) {
	(*uu_FileCallback) (uu_FileCBArg, iter->data->sfname,
			    uugen_fnbuffer, 0);
	UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		   uustring (S_NOT_OPEN_FILE),
		   uugen_fnbuffer, strerror (uu_errno = errno));
	res = UURET_IOERR;
	break;
      }
    }
    else {
      if ((datain = fopen (iter->data->sfname, "rb")) == NULL) {
	UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		   uustring (S_NOT_OPEN_FILE),
		   iter->data->sfname, strerror (uu_errno = errno));
	res = UURET_IOERR;
	break;
      }
      _FP_strncpy (uugen_fnbuffer, iter->data->sfname, 1024);
    }

    progress.partno  = part;
    progress.fsize   = (iter->data->length)?iter->data->length:-1;
    progress.percent = 0;
    progress.foffset = iter->data->startpos;

    fseek              (datain, iter->data->startpos, SEEK_SET);
    res = UUDecodePart (datain, dataout, &state,
			iter->data->startpos+iter->data->length,
			data->uudet, iter->data->flags, NULL);
    fclose             (datain);

    if (uu_FileCallback)
      (*uu_FileCallback) (uu_FileCBArg, iter->data->sfname, uugen_fnbuffer, 0);

    if (state == DONE || res != UURET_OK)
      break;

    iter = iter->NEXT;
  }

  if (state == DATA && 
      (data->uudet == B64ENCODED || data->uudet == QP_ENCODED ||
       data->uudet == PT_ENCODED))
    state = DONE; /* assume we're done */

  fclose (dataout);

  if (res != UURET_OK || (state != DONE && !uu_desperate)) {
    unlink (data->binfile);
    _FP_free (data->binfile);
    data->binfile = NULL;
    data->state  &= ~UUFILE_TMPFILE;
    data->state  |=  UUFILE_ERROR;

    if (res == UURET_OK && state != DONE)
      res = UURET_NOEND;
  }
  else if (res != UURET_OK) {
    data->state &= ~UUFILE_DECODED;
    data->state |=  UUFILE_ERROR | UUFILE_TMPFILE;
  }
  else {
    data->state &= ~UUFILE_ERROR;
    data->state |=  UUFILE_TMPFILE;
  }

  /*
   * If this was a BinHex file, we must extract its data or resource fork
   */

  if (data->uudet == BH_ENCODED && data->binfile) {
    if ((ntmp = tempnam (NULL, "uu")) == NULL) {
      UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		 uustring (S_NO_TEMP_NAME));
      progress.action = 0;
      return UURET_NOMEM;
    }
    if ((datain = fopen (data->binfile, "rb")) == NULL) {
      UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		 uustring (S_NOT_OPEN_FILE),
		 data->binfile, strerror (uu_errno = errno));
      progress.action = 0;
      free (ntmp);
      return UURET_IOERR;
    }
    if ((dataout = fopen (ntmp, "wb")) == NULL) {
      UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		 uustring (S_NOT_OPEN_TARGET),
		 ntmp, strerror (uu_errno = errno));
      progress.action = 0;
      fclose (datain);
      free   (ntmp);
      return UURET_IOERR;
    }
    /*
     * read fork lengths. remember they're in Motorola format
     */
    r[0] = fgetc (datain);
    hb   = (int) r[0] + 22;
    fseek (datain, (int) r[0] + 12, SEEK_SET);
    fread (r, 1, 8, datain);

    dsize = (((long) 1 << 24) * (long) r[0]) +
            (((long) 1 << 16) * (long) r[1]) +
            (((long) 1 <<  8) * (long) r[2]) +
            (                   (long) r[3]);
    rsize = (((long) 1 << 24) * (long) r[4]) +
	    (((long) 1 << 16) * (long) r[5]) +
	    (((long) 1 <<  8) * (long) r[6]) +
	    (                   (long) r[7]);

    UUMessage (uunconc_id, __LINE__, UUMSG_MESSAGE,
	       uustring (S_BINHEX_SIZES),
	       dsize, rsize);

    if (dsize == 0) {
      fseek  (datain, dsize + hb + 2, SEEK_SET);
      numbytes = rsize;
    }
    else if (rsize == 0) {
      fseek  (datain, hb, SEEK_SET);
      numbytes = dsize;
    }
    else {
      /* we should let the user have the choice here */
      UUMessage (uunconc_id, __LINE__, UUMSG_NOTE,
		 uustring (S_BINHEX_BOTH));
      fseek  (datain, hb, SEEK_SET);
      numbytes = dsize;
    }

    progress.action   = 0;
    progress.partno   = 0;
    progress.numparts = 1;
    progress.fsize    = (numbytes)?numbytes:-1;
    progress.foffset  = hb;
    progress.percent  = 0;
    progress.action   = UUACT_COPYING;

    /*
     * copy the chosen fork
     */

    while (!feof (datain) && numbytes) {
      if (UUBUSYPOLL(ftell(datain)-progress.foffset,progress.fsize)) {
	UUMessage (uunconc_id, __LINE__, UUMSG_NOTE,
		   uustring (S_DECODE_CANCEL));
	fclose (datain);
	fclose (dataout);
	unlink (ntmp);
	free   (ntmp);
	return UURET_CANCEL;
      }

      bytes = fread (uugen_inbuffer, 1,
		     (size_t) ((numbytes>1024)?1024:numbytes), datain);

      if (ferror (datain) || (bytes == 0 && !feof (datain))) {
	progress.action = 0;
	UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		   uustring (S_SOURCE_READ_ERR),
		   data->binfile, strerror (uu_errno = errno));
	fclose (datain);
	fclose (dataout);
	unlink (ntmp);
	free   (ntmp);
	return UURET_IOERR;
      }
      if (fwrite (uugen_inbuffer, 1, bytes, dataout) != bytes) {
	progress.action = 0;
	UUMessage (uunconc_id, __LINE__, UUMSG_ERROR,
		   uustring (S_WR_ERR_TARGET),
		   ntmp, strerror (uu_errno = errno));
	fclose (datain);
	fclose (dataout);
	unlink (ntmp);
	free   (ntmp);
	return UURET_IOERR;
      }
      numbytes -= bytes;
    }

    if (numbytes) {
      UUMessage (uunconc_id, __LINE__, UUMSG_WARNING,
		 uustring (S_SHORT_BINHEX),
		 (data->filename)?data->filename:
		 (data->subfname)?data->subfname:"???",
		 numbytes);
    }

    /*
     * replace temp file
     */

    fclose (datain);
    fclose (dataout);

    if (unlink (data->binfile)) {
      UUMessage (uunconc_id, __LINE__, UUMSG_WARNING,
		 uustring (S_TMP_NOT_REMOVED),
		 data->binfile, strerror (uu_errno = errno));
    }

    free (data->binfile);
    data->binfile = ntmp;
  }

  progress.action = 0;
  return res;
}

/*
 * QuickDecode for proper MIME attachments. We expect the pointer to
 * be on the first header line.
 */

int
UUQuickDecode (FILE *datain, FILE *dataout, char *boundary, long maxpos)
{
  int state=BEGIN, encoding=-1;
  headers myenv;

  /*
   * Read header and find out about encoding.
   */

  memset (&myenv, 0, sizeof (headers));
  UUScanHeader (datain, &myenv);

  if (_FP_stristr (myenv.ctenc, "uu") != NULL)
    encoding = UU_ENCODED;
  else if (_FP_stristr (myenv.ctenc, "xx") != NULL)
    encoding = XX_ENCODED;
  else if (_FP_stricmp (myenv.ctenc, "base64") == 0)
    encoding = B64ENCODED;
  else if (_FP_stricmp (myenv.ctenc, "quoted-printable") == 0)
    encoding = QP_ENCODED;
  else
    encoding = PT_ENCODED;

  UUkillheaders (&myenv);

  /*
   * okay, so decode this one
   */

  (void) UUDecodePart (NULL, NULL, NULL, 0, 0, 0, NULL); /* init  */
  return UUDecodePart (datain, dataout, &state, maxpos,
		       encoding, FL_PROPER|FL_TOEND,
		       boundary);
}