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MSBMKB.PAS
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Wrap
Pascal/Delphi Source File
|
1992-07-30
|
7KB
|
224 lines
(* TURBO pascal version of MSBMKB *)
(* *)
(* Author: Gisbert W.Selke (RECK@DBNUAMA1.BITNET) *)
(* Wissenschaftliches Institut der Ortskrankenkassen *)
(* Kortrijker Strasse 1 *)
(* D-5300 Bonn 1 *)
(* West Germany *)
(* 10 February 1988 *)
(* RECK@DBNUAMA1.BITNET *)
(* *)
(* Produces boo-encoding of a binary file for transfer over *)
(* data links. Beware of EBCDIC <-> ASCII gremlins, however!*)
(* *)
(* Version 1.2: change for Turbo-Pascal 4.0 *)
(* *)
(*$S-*) (* stack checking off *)
(*$R-*) (* Range checking off *)
(*$B-*) (* Boolean complete evaluation off *)
(*$I+*) (* I/O checking on *)
(*$N-*) (* No numeric coprocessor *)
(*$M 65500,16384,16384*) (* Reduce maximum heap *)
program msbmkb;
uses crt;
const repchar : char = '~';
nullbyte : byte = $00;
b2 : byte = $03;
b4 : byte = $0F;
b6 : byte = $3F;
blocksize = 128;
offset = 48; (* ord('0') *)
maxrep = 78;
bufsize = 32000;
maxlinlength = 76;
defaultext = '.BOO';
type buftype = array (.1..bufsize.) of byte;
var a, b, c : byte;
bytect, buffct, restbytes, maxblocks, bbufsize, linlength, repct : integer;
fs, rin, rout : longint;
reff : real;
isend,preend : boolean;
infilename, outfilename, sname : string(.63.);
(* maximum path length in DOS *)
buffer, outbuffer : buftype;
infile : file;
outfile : text;
function getbyte : byte;
(* get one byte from input stream; mark eof and yield 0 afterwards *)
var ires : word;
begin (* getbyte *)
if isend then
begin (* end of file *)
getbyte := nullbyte;
exit;
end; (* end of file *)
if bytect >= bbufsize then
begin (* read next buffer *)
if preend then
begin (* end of file *)
getbyte := 0;
isend := true;
exit;
end; (* end of file *)
blockread(infile,buffer,maxblocks,ires);
if ires <> maxblocks then
begin (* last buffer! *)
preend := true;
bbufsize := restbytes;
end; (* last buffer! *)
bytect := 0;
inc(buffct);
write(chr(13),'Buffer ',buffct);
end; (* read next buffer *)
inc(bytect);
getbyte := buffer(.bytect.);
end; (* getbyte *)
procedure prepare;
(* get input and output file names; open files; get input file size *)
procedure getnames;
(* get input and output file names from command line *)
var i : integer;
begin (* getnames *)
if not (paramcount in (.1..2.)) then
Begin (* argument number error *)
writeln('Wrong number of parameters.');
writeln('Usage: MSBMKB <input file name> (<output file name>)');
halt(1);
end; (* argument number error *)
infilename := paramstr(1);
for i := 1 to length(infilename) do infilename(.i.) :=
UpCase(infilename(.i.));
sname := infilename;
while pos(':',sname) <> 0 do delete(sname,1,pos(':',sname));
while pos('\',sname) <> 0 do delete(sname,1,pos('\',sname));
outfilename := sname;
if pos('.',outfilename) <> 0 then delete(outfilename,
pos('.',outfilename),999);
outfilename := outfilename + defaultext;
if outfilename = infilename then outfilename(.length(infilename).) :=
succ(outfilename(.length(infilename).));
if paramcount = 2 then outfilename := paramstr(2);
for i := 1 to length(outfilename) do outfilename(.i.) :=
UpCase(outfilename(.i.));
end; (* getnames *)
procedure openfiles;
(* open input and output files; abort if error *)
var ch : char;
begin (* openfiles *)
assign(infile,infilename);
(*$I-*) reset(infile,blocksize); (*$I+*)
if IOResult <> 0 then
begin
writeln('Can''t find ',infilename);
halt(1);
end;
assign(outfile,outfilename);
settextbuf(outfile,outbuffer);
(*$I-*) reset(outfile); (*$I+*)
if IOResult = 0 then
begin (* overwrite existing file? *)
write('Output file ',outfilename,
' already exists. Continue (y/n)? ');
repeat
ch := readkey;
ch := upcase(ch);
until ch in (.'N','0','J','Y','1'.);
writeln;
if ch in (.'N','0'.) then halt(1);
end; (* overwrite existing file? *)
(*$I-*) rewrite(outfile); (*$I+*)
if IOResult<>0 then
begin
writeln('Can''t open output file ',outfilename);
halt(1);
end;
end; (* openfiles *)
procedure getsize;
(* get size of input file; initialize certain variables *)
var dummyfile : file of byte;
begin (* getsize *)
assign(dummyfile,infilename);
reset(dummyfile);
fs := filesize(dummyfile);
close(dummyfile);
restbytes := fs - (pred(fs) div bufsize) * bufsize;
buffct := 0;
bbufsize := bufsize;
bytect := succ(bbufsize);
maxblocks := bufsize div blocksize;
end; (* getsize *)
begin (* prepare *)
getnames;
openfiles;
getsize;
checkbreak := false;
end; (* prepare *)
begin (* main *)
writeln('MSBPCT 1.2');
prepare;
writeln('Encoding ',infilename,' to ',outfilename);
writeln(outfile,sname);
isend := false;
preend := false;
linlength := 0;
rout := length(sname) + 2;
a := getbyte;
while not isend do
begin (* get all chunks *)
b := getbyte;
if (a=0) and (b=0) then
begin (* repeatnull *)
repct := 1;
repeat
inc(repct);
a := getbyte;
until isend or (a <> nullbyte) or (repct >= maxrep);
if linlength+2 > maxlinlength then
begin (* finish line *)
writeln(outfile);
rout := rout + linlength + 2;
linlength := 0;
end; (* finish line *)
write(outfile,repchar,chr(repct+offset));
inc(linlength,2);
end (* repeatnull *) else
begin (* ordinary chunk *)
c := getbyte;
if linlength+4 > maxlinlength then
begin (* finish line *)
writeln(outfile);
rout := rout + linlength + 2;
linlength := 0;
end; (* finish line *)
write(outfile,chr((a shr 2) + offset),
chr((((a and b2) shl 4) or (b shr 4)) + offset),
chr((((b and b4) shl 2) or (c shr 6)) + offset),
chr((c and b6) + offset));
inc(linlength,4);
a := getbyte;
end; (* ordinary chunk *)
end; (* get all chunks *)
writeln(outfile);
rout := rout + linlength + 2;
flush(outfile);
close(infile);
close(outfile);
rin := longint(pred(buffct))*bufsize + bytect;
reff := 100.0 * rin / rout;
writeln(chr(13),rin:0,' bytes in, ',rout:0,
' bytes out; efficiency: ',reff:0:1,'%');
end. (* main *)