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1990-08-05
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$D AFS-} { indicates to compile to run without Adv. File Sys.
unit sender;
interface
{Change log:
13 May 89, V1.1: Misc. cleanups to debug messages RTC
26 Apr 89, V1.1: minor cleanups RTC
16 Apr 89, V1.1: Fixed "garbage in buffer" bug RTC
13 Apr 89, V1.1: Added Version message RTC
14 Aug 88: Fixed timeout state bug RTC
07 Aug 88: Added conditional compilation for AFS/SFS difference RTC
31 Jul 88: Added Attributes Packets & cancel xfr request from receiver RTC
10 Jul 88: Converted to use screenops unit RTC
10 Jul 88: Fixed cleareol problem on filenames RTC
02 Jul 88: Fixed sinit 8th-bit prefix negotiation bug RTC
30 Jun 88: Added Binary and multiple file transfers RTC
}
procedure sendsw(var send_ok: boolean);
procedure sen_version;
implementation
uses
screenops, {RTC, 10 Jul 88}
{$U kermglob.code} kermglob,
{$U kermutil.code} kermutil,
{$U kermpack.code} kermpack,
{$B AFS+} {$U syslibr:attribute.code} attributes, {$E AFS+}
{$U syslibr:wild.code} wild,
{$U syslibr:dir.info.code} dirinfo;
const
my_version = ' Sender Unit V1.1, 13 May 89';
procedure sendsw{(var send_ok: boolean)};
var
do_attr, still_sending, discard, next_is_empty : boolean;
files_to_send : D_listp;
io_status: integer;
heap: ^integer;
{$B AFS-}
this_file : D_listp;
{$E AFS-}
procedure openfile;
(* resets file of appropriate type *)
var
dummy : boolean;
begin
if debug then
debugwrite(concat('Opening ',xfilename));
(*$I-*) (* turn off compiler i/o checking temporarily *)
if f_is_binary
then
begin
reset(b_file,xfilename);
if io_result = 0 then
{$B AFS+}
dummy := get_attribute(b_file,FA_lastvalidbyte,last_blksize);
{$E AFS+} {$B AFS-}
last_blksize := 512; {default as we can't determine it}
{$E AFS-}
bufend := 0 {mark the buffer as empty!}
end
else reset(t_file,xfilename);
(*$I+*) (* turn compiler i/o checking back on *)
io_status := io_result;
{$B AFS-}
this_file := files_to_send;
{$E AFS-}
end; (* openfile *)
function sinit: char;
(* send init packet & receive other side's *)
var num, len, i: integer; (* packet number and length *)
ch: char;
begin
if debug then
debugwrite('sinit');
if numtry > maxtry then
begin
sinit := 'a';
exit(sinit)
end;
num_try := num_try + 1;
spar(packet);
clear_buf(inport);
refresh_screen(numtry,n);
spack('S',n mod 64,10,packet);
ch := rpack(len,num,recpkt);
if (ch = 'N') then
begin
sinit := 's';
exit(sinit)
end (* if 'N' *)
else if (ch = 'Y') then
begin
if ((n mod 64) <> num) then (* not the right ack *)
begin
sinit := currstate;
exit(sinit)
end;
rpar(recpkt,len);
if (xeol = chr(0)) then (* if they didn't spec eol *)
xeol := chr(my_eol); (* use mine *)
if (quote = chr(0)) then (* if they didn't spec quote *)
quote := my_quote; (* use mine *)
ctl_set := [chr(0)..chr(31),chr(del),quote];
if en_qbin then ctl_set := ctl_set + [qbin];
numtry := 0;
n := n + 1; (* increase packet number *)
sinit := 'f';
exit(sinit)
end (* else if 'Y' *)
else if (ch = 'E') then
begin
error(recpkt,len);
sinit := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then
sinit := currstate
else if (ch <> 'N') then
sinit := 'a'
end; (* sinit *)
function sattr: char;
(* send attributes packet *)
var num, len: integer;
ch: char;
got_attr : boolean;
{$B AFS+}
file_date : FA_chron;
{$E AFS+}
packet : packettype;
begin
if debug then
debugwrite('sattr');
if numtry > maxtry then
begin
sattr := 'a';
exit(sattr)
end;
num_try := num_try + 1;
refresh_screen(numtry,n);
packet[0] := '#'; { creation date attribute }
{$B AFS+}
packet[1] := tochar(chr(12)); { length }
if f_is_binary
then got_attr := get_attribute(b_file,FA_revision_date,file_date)
else got_attr := get_attribute(t_file,FA_revision_date,file_date);
with file_date,date,time do
{$E AFS+} {$B AFS-}
packet[1] := tochar(chr(6)); { length }
with this_file^.D_date do
{$E AFS-}
begin
packet[2] := chr(year div 10 + ord('0'));
packet[3] := chr(year mod 10 + ord('0'));
packet[4] := chr(month div 10 + ord('0'));
packet[5] := chr(month mod 10 + ord('0'));
packet[6] := chr(day div 10 + ord('0'));
packet[7] := chr(day mod 10 + ord('0'));
{$B AFS+}
packet[8] := ' ';
packet[9] := chr(hour div 10 + ord('0'));
packet[10] := chr(hour mod 10 + ord('0'));
packet[11] := ':';
packet[12] := chr(min div 10 + ord('0'));
packet[13] := chr(min mod 10 + ord('0'))
{$E AFS+}
end;
spack('A',n mod 64,{$B AFS+}14{$E AFS+} {$B AFS-}8{$E AFS-},packet);
ch := rpack(len,num,recpkt);
if (ch = 'N') then
begin
sattr := 'd';
exit(sattr)
end (* if 'N' *)
else if (ch = 'Y') then
begin
if ((n mod 64) <> num) then (* not the right ack *)
begin
sattr := currstate;
exit(sattr)
end;
numtry := 0;
n := n + 1; (* increase packet number *)
do_attr := false;
discard := (len > 0) and (recpkt[0] = 'N');
if discard
then sattr := 'z'
else sattr := 'd';
exit(sattr)
end (* else if 'Y' *)
else if (ch = 'E') then
begin
error(recpkt,len);
sattr := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then
sattr := currstate
else if (ch <> 'N') then
sattr := 'a'
end; (* sattr *)
function sdata: char;
(* send file data *)
var num, len: integer;
ch: char;
packarray: array[boolean] of packettype;
sizearray: array[boolean] of integer;
current: boolean;
b: boolean;
function other(b: boolean): boolean;
(* complements a boolean which is used as array index *)
begin
if b then
other := false
else
other := true
end; (* other *)
begin
discard := false;
current := true;
packarray[current] := packet;
sizearray[current] := size;
next_is_empty := true;
while (currstate = 'd') do
begin
if (numtry > maxtry) then (* if too many tries, give up *)
currstate := 'a';
b := other(current);
numtry := numtry + 1;
(* send a data packet *)
spack('D',n mod 64,sizearray[current],packarray[current]);
refresh_screen(numtry,n);
if next_is_empty then (* set up next packet *)
begin
sizearray[b] := bufill(packarray[b]);
next_is_empty := false
end;
ch := rpack(len,num,recpkt); (* receive a packet *)
if ch = 'N' then (* NAK, so just stay in this state *)
if ((n+1) mod 64 <> num) then (* unless NAK for next packet, which *)
sdata := currstate
else (* is just like ACK for this packet *)
begin
if num > 0 then
num := (num - 1) (* in which case, decrement num *)
else
num := 63;
ch := 'Y'; (* and indicate an ACK *)
end; (* else *)
if (ch = 'Y') then
begin
if ((n mod 64) <> num) then (* if wrong ACK *)
(* stay in same state *)
else
begin
numtry := 0;
n := n + 1;
current := b;
next_is_empty := true;
discard := sizearray[current] = at_badblk;
if read_ch(keyport, ch) then {check for user canceling send}
begin
if ord(ch) in [can_cur,can_all]
then discard := true;
if ord(ch) = can_all
then files_to_send := nil
end;
if len = 1 then {check for receiver canceling send}
begin
if recpkt[0] in ['X','Z']
then discard := true;
if recpkt[0] = 'Z'
then files_to_send := nil
end;
if (sizearray[current] = at_eof) or discard then
currstate := 'z' (* set state to eof *)
else
currstate := 'd' (* else stay in data state *)
end {else}
end (* if *)
else if (ch = 'E') then
begin
error(recpkt,len);
currstate := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then (* receive failure, so stay in d *)
else if (ch <> 'N') then
currstate := 'a' (* on anything else goto abort state *)
end; (* while *)
size := sizearray[current];
packet := packarray[current];
sdata := currstate
end; (* sdata *)
function sfile: char;
(* send file header *)
var num, len, i: integer;
ch: char;
fn: packettype;
oldfn: string255;
procedure legalize(var fn: string255);
(* make sure we send only 1 '.' in filename *)
var count, i, j, l: integer;
begin
if not lit_names then
begin
count := 0;
l := length(fn);
for i := 1 to l do (* count '.'s in fn *)
if fn[i] = '.' then
count := count + 1;
for i := 1 to count-1 do (* remove all but 1 *)
begin
j := 1;
while (j < l) and (fn[j] <> '.') do
j := j + 1; (* by finding it *)
fn := concat(copy(fn,1,j-1),copy(fn,j+1,l-j)); (* and copying around it *)
l := l - 1
end (* for i *)
end;
i := pos(':',fn);
if i <> 0 then
fn := copy(fn,i+1,length(fn)-i) {remove Vol. name}
end; (* legalize *)
begin
if debug then
debugwrite('sfile');
if (numtry > maxtry) then (* if too many tries, give up *)
begin
sfile := 'a';
exit(sfile)
end;
numtry := numtry + 1;
oldfn := xfilename;
legalize(xfilename); (* make filename acceptable to remote *)
len := length(xfilename);
moveleft(xfilename[1],fn[0],len); (* move filename into a packettype *)
SC_erase_to_EOL(filepos,fileline);
write(oldfn,' ==> ',xfilename);
refresh_screen(numtry,n);
spack('F',n mod 64,len,fn); (* send file header packet *)
if next_is_empty then
begin
size := bufill(packet); (* get first data from file *)
next_is_empty := false
end; (* while waiting for response *)
ch := rpack(len,num,recpkt);
if ch = 'N' then (* NAK, so just stay in this state *)
if ((n+1) mod 64 <> num) then (* unless NAK for next packet, which *)
begin
sfile := 'f';
exit(sfile) (* is just like ACK for this packet *)
end
else
begin
if (num > 0) then
num := (num - 1) (* in which case, decrement num *)
else
num := 63;
ch := 'Y'; (* and indicate an ACK *)
end; (* else *)
if (ch = 'Y') then
begin
if ((n mod 64) <> num) then (* if wrong ACK, stay in F state *)
begin
sfile := 'f';
exit(sfile)
end;
numtry := 0;
n := n + 1;
do_attr := en_attr;
sfile := 'd';
end (* if *)
else if (ch = 'E') then
begin
error(recpkt,len);
sfile := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then {stay in f state}
sfile := 'f'
else if (ch <> 'N') then (* don't recognize it *)
sfile := 'a'
end; (* sfile *)
function seof: char;
(* send end of file *)
var num, len: integer;
ch: char;
begin
if debug then
debugwrite('seof');
if (numtry > maxtry) then (* if too many tries, give up *)
begin
seof := 'a';
exit(seof)
end;
numtry := numtry + 1;
refresh_screen(numtry,n);
packet[0] := 'D'; {set up in case of discard}
spack('Z',(n mod 64),ord(discard),packet); (* send end of file packet *)
if debug then
debugwrite('seof1');
ch := rpack(len,num,recpkt);
if ch = 'N' then (* NAK, so just stay in this state *)
if ((n+1) mod 64 <> num) then (* unless NAK for next packet, which *)
begin
seof := 'z';
exit(seof) (* is just like ACK for this packet *)
end
else
begin
if num > 0 then
num := (num - 1) (* in which case, decrement num *)
else
num := 63;
ch := 'Y'; (* and indicate an ACK *)
end; (* else *)
if (ch = 'Y') then
begin
if debug then
debugwrite('seof2');
if ((n mod 64) <> num) then (* if wrong ACK, stay in Z state *)
begin
seof := 'z';
exit(seof)
end;
numtry := 0;
n := n + 1;
if debug then
debugwrite(concat('Closing ',xfilename));
if f_is_binary
then close(b_file)
else close(t_file);
while files_to_send <> nil do with files_to_send^ do
begin
xfilename := concat(D_volume,':',D_title);
seof := 'f';
next_is_empty := true;
openfile;
files_to_send := D_next_entry;
if io_status <> 0
then io_error(io_status)
else exit(seof)
end {while};
seof := 'b'
end (* if *)
else if (ch = 'E') then
begin
error(recpkt,len);
seof := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then (* receive failed, so stay in z state *)
seof := 'z'
else if (ch <> 'N') then (* other error, just abort *)
seof := 'a'
end; (* seof *)
function sbreak: char;
var num, len: integer;
ch: char;
(* send break (end of transmission) *)
begin
if debug then
debugwrite('sbreak');
if (numtry > maxtry) then (* if too many tries, give up *)
begin
sbreak := 'a';
exit(sbreak)
end;
numtry := numtry + 1;
refresh_screen(numtry,n);
spack('B',(n mod 64),0,packet); (* send Break Transfer packet *)
ch := rpack(len,num,recpkt);
if ch = 'N' then (* NAK, so just stay in this state *)
if ((n+1) mod 64 <> num) then (* unless NAK for next packet, which *)
begin
sbreak := 'b';
exit(sbreak) (* is just like ACK for this packet *)
end
else
begin
if num > 0 then
num := (num - 1) (* in which case, decrement num *)
else
num := 63;
ch := 'Y'; (* and indicate an ACK *)
end; (* else *)
if (ch = 'Y') then
begin
if ((n mod 64) <> num) then (* if wrong ACK, stay in B state *)
begin
sbreak := 'b';
exit(sbreak)
end;
numtry := 0;
n := n + 1;
sbreak := 'c' (* else, switch state to complete *)
end (* if *)
else if (ch = 'E') then
begin
error(recpkt,len);
sbreak := 'a'
end (* if 'E' *)
else if (ch = chr(0)) then (* receive failed, so stay in b state *)
sbreak := 'b'
else if (ch <> 'N') then (* other error, just abort *)
sbreak := 'a'
end; (* sbreak *)
(* state table switcher for sending *)
begin (* sendsw *)
mark(heap);
send_ok := false;
still_sending :=
D_dirlist(xfilename,[D_code..D_svol],files_to_send,false) = D_okay;
if files_to_send <> nil then with files_to_send^ do
begin
xfilename := concat(D_volume,':',D_title);
next_is_empty := true;
openfile;
files_to_send := D_next_entry;
if io_status <> 0 then
begin
io_error(io_status);
still_sending := false
end
end;
if still_sending then write_screen('Sending');
currstate := 's';
n := 0; (* set packet # *)
numtry := 0;
flush_comm; {flush any garbage in buffer}
while still_sending do
if currstate in ['d', 'f', 'z', 's', 'b', 'c', 'a'] then
case currstate of
'd': if do_attr
then currstate := sattr
else currstate := sdata;
'f': currstate := sfile;
'z': currstate := seof;
's': currstate := sinit;
'b': currstate := sbreak;
'c': begin
send_ok := true;
still_sending := false
end; (* case c *)
'a': still_sending := false
end (* case *)
else (* state not in legal states *)
begin
debugwrite('Unknown State');
still_sending := false
end (* else *);
release(heap)
end; (* sendsw *)
procedure sen_version;
begin
writeln(my_version)
end {sen_version};
end. { sender }