mtxdos.c

mgcp协议源代码。支持多种编码：g711

  MESSAGECACHE *elt;
  char tmp[MAILTMPLEN];
				/* do nothing if stream dead */
  if (!mtx_ping (stream)) return;
  if (stream->rdonly) {		/* won't do on readonly files! */
    mm_log ("Expunge ignored on readonly mailbox",WARN);
    return;
  }
  mm_critical (stream);		/* go critical */
  recent = stream->recent;	/* get recent now that pinged */ 
  while (i <= stream->nmsgs) {	/* for each message */
    elt = mail_elt (stream,i);	/* get cache element */
				/* number of bytes to smash or preserve */
    k = elt->private.special.text.size + elt->rfc822_size;
    if (elt->deleted) {		/* if deleted */
      if (elt->recent) --recent;/* if recent, note one less recent message */
      delta += k;		/* number of bytes to delete */
      mail_expunged (stream,i);	/* notify upper levels */
      n++;			/* count up one more deleted message */
    }
    else if (i++ && delta) {	/* preserved message */
				/* first byte to preserve */
      j = elt->private.special.offset;
      do {			/* read from source position */
	m = min (k,(unsigned long) MAILTMPLEN);
	lseek (LOCAL->fd,j,SEEK_SET);
	read (LOCAL->fd,tmp,(size_t) m);
				/* write to destination position */
	lseek (LOCAL->fd,j - delta,SEEK_SET);
	write (LOCAL->fd,tmp,(size_t) m);
	j += m;			/* next chunk, perhaps */
      } while (k -= m);		/* until done */
      elt->private.special.offset -= delta;
    }
  }
  if (n) {			/* truncate file after last message */
    chsize (LOCAL->fd,LOCAL->filesize -= delta);
    sprintf (tmp,"Expunged %ld messages",n);
    mm_log (tmp,(long) NIL);	/* output the news */
  }
  else mm_log ("No messages deleted, so no update needed",(long) NIL);
  mm_nocritical (stream);	/* release critical */
				/* notify upper level of new mailbox size */
  mail_exists (stream,stream->nmsgs);
  mail_recent (stream,recent);
}

/* MTX mail copy message(s)
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 *	    copy options
 * Returns: T if success, NIL if failed
 */

long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
  char tmp[MAILTMPLEN];
  struct stat sbuf;
  MESSAGECACHE *elt;
  unsigned long i,j,k;
  long ret = LONGT;
  int fd;
  mailproxycopy_t pc =
    (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
  if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
	mail_sequence (stream,sequence))) return NIL;
  if (!mtx_isvalid (mailbox,tmp)) switch (errno) {
  case ENOENT:			/* no such file? */
    mm_notify (stream,"[TRYCREATE] Must create mailbox before append",
	       (long) NIL);
    return NIL;
  case 0:			/* merely empty file? */
    break;
  case EINVAL:			/* name is bogus */
    if (pc) return (*pc) (stream,sequence,mailbox,options);
    return mtx_badname (tmp,mailbox);
  default:			/* file exists, but not valid format */
    if (pc) return (*pc) (stream,sequence,mailbox,options);
    sprintf (tmp,"Not a MTX-format mailbox: %s",mailbox);
    mm_log (tmp,ERROR);
    return NIL;
  }
				/* open the destination */
  if ((fd = open (mailboxfile (tmp,mailbox),
		  O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IREAD|S_IWRITE)) < 0) {
    sprintf (tmp,"Unable to open copy mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }

  mm_critical (stream);		/* go critical */
  fstat (fd,&sbuf);		/* get current file size */
				/* for each requested message */
  for (i = 1; ret && (i <= stream->nmsgs); i++)
    if ((elt = mail_elt (stream,i))->sequence) {
      lseek (LOCAL->fd,elt->private.special.offset,SEEK_SET);
				/* number of bytes to copy */
      k = elt->private.special.text.size + elt->rfc822_size;
      do {			/* read from source position */
	j = min (k,(long) MAILTMPLEN);
	read (LOCAL->fd,tmp,(size_t) j);
	if (write (fd,tmp,(size_t) j) < 0) {
	  sprintf (tmp,"Unable to write message: %s",strerror (errno));
	  mm_log (tmp,ERROR);
	  chsize (fd,sbuf.st_size);
	  j = k;
	  ret = NIL;		/* note error */
	  break;
	}
      } while (k -= j);		/* until done */
    }
  close (fd);			/* close the file */
  mm_nocritical (stream);	/* release critical */
				/* delete all requested messages */
  if (ret && (options & CP_MOVE)) for (i = 1; i <= stream->nmsgs; i++)
    if ((elt = mail_elt (stream,i))->sequence) {
      elt->deleted = T;		/* mark message deleted */
				/* recalculate status */
      mtx_update_status (stream,i);
    }
  return ret;
}

/* MTX mail append message from stringstruct
 * Accepts: MAIL stream
 *	    destination mailbox
 *	    append callback
 *	    data for callback
 * Returns: T if append successful, else NIL
 */

long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
  struct stat sbuf;
  int fd,ld,c;
  char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN];
  FILE *df;
  MESSAGECACHE elt;
  long f;
  unsigned long i,uf;
  STRING *message;
  long ret = LONGT;
				/* default stream to prototype */
  if (!stream) stream = &mtxproto;
				/* make sure valid mailbox */
  if (!mtx_isvalid (mailbox,tmp)) switch (errno) {
  case ENOENT:			/* no such file? */
    if (((mailbox[0] == 'I') || (mailbox[0] == 'i')) &&
	((mailbox[1] == 'N') || (mailbox[1] == 'n')) &&
	((mailbox[2] == 'B') || (mailbox[2] == 'b')) &&
	((mailbox[3] == 'O') || (mailbox[3] == 'o')) &&
	((mailbox[4] == 'X') || (mailbox[4] == 'x')) && !mailbox[5])
      dummy_create (NIL,"INBOX.MTX");
    else {
      mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
      return NIL;
    }
				/* falls through */
  case 0:			/* merely empty file? */
    break;
  case EINVAL:
    return mtx_badname (tmp,mailbox);
  default:
    sprintf (tmp,"Not a MTX-format mailbox: %.80s",mailbox);
    mm_log (tmp,ERROR);
    return NIL;
  }
				/* get first message */
  if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
				/* open destination mailbox */
  if (((fd = open(mailboxfile(file,mailbox),O_BINARY|O_WRONLY|O_APPEND|O_CREAT,
		   S_IREAD|S_IWRITE)) < 0) || !(df = fdopen (fd,"ab"))) {
    sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }
  mm_critical (stream);		/* go critical */
  fstat (fd,&sbuf);		/* get current file size */

  do {				/* parse flags */
    f = mail_parse_flags (stream,flags,&i);
				/* reverse bits (dontcha wish we had CIRC?) */
    for (uf = 0; i; uf |= 1 << (29 - find_rightmost_bit (&i)));
    if (date) {			/* parse date if given */
      if (!mail_parse_date (&elt,date)) {
	sprintf (tmp,"Bad date in append: %.80s",date);
	mm_log (tmp,ERROR);
	ret = NIL;		/* mark failure */
	break;
      }
      mail_date (tmp,&elt);	/* write preseved date */
    }
    else internal_date (tmp);	/* get current date in IMAP format */
				/* write header */
    if (fprintf (df,"%s,%lu;%010lo%02lo\015\012",tmp,i = SIZE (message),uf,
		 (unsigned long) f) < 0) ret = NIL;
    else {			/* write message */
      if (i) do c = 0xff & SNX (message);
      while ((putc (c,df) != EOF) && --i);
				/* get next message */
      if (i || !(*af) (stream,data,&flags,&date,&message)) ret = NIL;
    }
  } while (ret && message);
				/* revert file if failure */
  if (!ret || (fflush (df) == EOF)) {
    chsize (fd,sbuf.st_size);	/* revert file */
    close (fd);			/* make sure fclose() doesn't corrupt us */
    sprintf (tmp,"Message append failed: %s",strerror (errno));
    mm_log (tmp,ERROR);
    ret = NIL;
  }
  fclose (df);			/* close the file */ 
  mm_nocritical (stream);	/* release critical */
  return ret;
}


/* Return bad file name error message
 * Accepts: temporary buffer
 *	    file name
 * Returns: long NIL always
 */

long mtx_badname (char *tmp,char *s)
{
  sprintf (tmp,"Invalid mailbox name: %s",s);
  mm_log (tmp,ERROR);
  return (long) NIL;
}

/* Parse mailbox
 * Accepts: MAIL stream
 * Returns: T if parse OK
 *	    NIL if failure, stream aborted
 */

long mtx_parse (MAILSTREAM *stream)
{
  struct stat sbuf;
  MESSAGECACHE *elt = NIL;
  char *s,*t,*x;
  char lbuf[65],tmp[MAILTMPLEN];
  long i;
  long curpos = LOCAL->filesize;
  long nmsgs = stream->nmsgs;
  long recent = stream->recent;
  fstat (LOCAL->fd,&sbuf);	/* get status */
  if (sbuf.st_size < curpos) {	/* sanity check */
    sprintf (tmp,"Mailbox shrank from %ld to %ld!",curpos,sbuf.st_size);
    mm_log (tmp,ERROR);
    mtx_close (stream,NIL);
    return NIL;
  }
				/* while there is stuff to parse */
  while (i = sbuf.st_size - curpos) {
				/* get to that position in the file */
    lseek (LOCAL->fd,curpos,SEEK_SET);
    if ((i = read (LOCAL->fd,lbuf,64)) <= 0) {
      sprintf (tmp,"Unable to read internal header at %ld, size = %ld: %s",
	       curpos,sbuf.st_size,i ? strerror (errno) : "no data read");
      mm_log (tmp,ERROR);
      mtx_close (stream,NIL);
      return NIL;
    }
    lbuf[i] = '\0';		/* tie off buffer just in case */
    if (!((s = strchr (lbuf,'\015')) && (s[1] == '\012'))) {
      sprintf (tmp,"Unable to find end of line at %ld in %ld bytes, text: %s",
	       curpos,i,lbuf);
      mm_log (tmp,ERROR);
      mtx_close (stream,NIL);
      return NIL;
    }
    *s = '\0';			/* tie off header line */
    i = (s + 2) - lbuf;		/* note start of text offset */
    if (!((s = strchr (lbuf,',')) && (t = strchr (s+1,';')))) {
      sprintf (tmp,"Unable to parse internal header at %ld: %s",curpos,lbuf);
      mm_log (tmp,ERROR);
      mtx_close (stream,NIL);
      return NIL;
    }

    *s++ = '\0'; *t++ = '\0';	/* tie off fields */
				/* intantiate an elt for this message */
    (elt = mail_elt (stream,++nmsgs))->valid = T;
    elt->private.uid = ++stream->uid_last;
				/* note file offset of header */
    elt->private.special.offset = curpos;
				/* as well as offset from header of message */
    elt->private.special.text.size = i;
				/* header size not known yet */
    elt->private.msg.header.text.size = 0;
				/* parse the header components */
    if (!(mail_parse_date (elt,lbuf) &&
	  (elt->rfc822_size = strtol (x = s,&s,10)) && (!(s && *s)) &&
	  isdigit (t[0]) && isdigit (t[1]) && isdigit (t[2]) &&
	  isdigit (t[3]) && isdigit (t[4]) && isdigit (t[5]) &&
	  isdigit (t[6]) && isdigit (t[7]) && isdigit (t[8]) &&
	  isdigit (t[9]) && isdigit (t[10]) && isdigit (t[11]) && !t[12])) {
      sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
	       curpos,lbuf,x,t);
      mtx_close (stream,NIL);
      return NIL;
    }
				/* update current position to next header */
    curpos += i + elt->rfc822_size;
				/* calculate system flags */
    if ((i = ((t[10]-'0') * 8) + t[11]-'0') & fSEEN) elt->seen = T;
    if (i & fDELETED) elt->deleted = T;
    if (i & fFLAGGED) elt->flagged = T;
    if (i & fANSWERED) elt->answered = T;
    if (i & fDRAFT) elt->draft = T;
    if (curpos > sbuf.st_size) {
      sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
	       elt->private.special.offset,curpos,sbuf.st_size);
      mm_log (tmp,ERROR);
      mtx_close (stream,NIL);
      return NIL;
    }
  }
				/* update parsed file size */
  LOCAL->filesize = sbuf.st_size;
  mail_exists (stream,nmsgs);	/* notify upper level of new mailbox size */
  mail_recent (stream,recent);	/* and of change in recent messages */
  return T;			/* return the winnage */
}

/* Update status string
 * Accepts: MAIL stream
 *	    message number
 */

void mtx_update_status (MAILSTREAM *stream,unsigned long msgno)
{
  char tmp[MAILTMPLEN];
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  unsigned long j,k = 0;
				/* not if readonly you don't */
  if (stream->rdonly || !elt->valid) return;
  j = elt->user_flags;		/* get user flags */
				/* reverse bits (dontcha wish we had CIRC?) */
  while (j) k |= 1 << 29 - find_rightmost_bit (&j);
  sprintf (tmp,"%010lo%02o",k,	/* print new flag string */
	   fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
	   (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
	   (fDRAFT * elt->draft));
				/* get to that place in the file */
  lseek (LOCAL->fd,(off_t) elt->private.special.offset +
	 elt->private.special.text.size - 14,SEEK_SET);
  write (LOCAL->fd,tmp,12);	/* write new flags */
}

/* MTX locate header for a message
 * Accepts: MAIL stream
 *	    message number
 *	    pointer to returned header size
 * Returns: position of header in file
 */

unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
			  unsigned long *size)
{
  unsigned long siz;
  size_t i = 0;
  int q = 0;
  char *s,tmp[MAILTMPLEN];
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  long pos = elt->private.special.offset + elt->private.special.text.size;
				/* is header size known? */
  if (!(*size = elt->private.msg.header.text.size)) {
				/* get to header position */
    lseek (LOCAL->fd,pos,SEEK_SET);
				/* search message for CRLF CRLF */
    for (siz = 1; siz <= elt->rfc822_size; siz++) {
      if (!i &&			/* buffer empty? */
	  (read (LOCAL->fd,s = tmp,
		 i = (size_t) min(elt->rfc822_size-siz,(long)MAILTMPLEN))<= 0))
	return pos;
      else i--;
      switch (q) {		/* sniff at buffer */
      case 0:			/* first character */
	q = (*s++ == '\015') ? 1 : 0;
	break;
      case 1:			/* second character */
	q = (*s++ == '\012') ? 2 : 0;
	break;
      case 2:			/* third character */
	q = (*s++ == '\015') ? 3 : 0;
	break;
      case 3:			/* fourth character */
	if (*s++ == '\012') {	/* have the sequence? */
				/* yes, note for later */
	  elt->private.msg.header.text.size = (*size = siz);
	  return pos;		/* return to caller */
	}
	q = 0;			/* lost... */
	break;
      }
    }
  }
  return pos;			/* have position */
}