file3.pas
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{$A+,B+,D-,E+,F+,I+,L+,N-,O+,R-,S+,V-}
unit file3;
interface
uses
crt,dos,
{rcg11172000 no overlay under Linux.}
{overlay,}
file0,
common;
procedure arc_proc(var fp:file; var abort,next:boolean);
procedure zoo_proc(var fp:file; var abort,next:boolean);
procedure lzh_proc(var fp:file; var abort,next:boolean);
implementation
uses file4;
{*------------------------------------------------------------------------*}
procedure arc_proc(var fp:file; var abort,next:boolean);
var arc:arcfilerec;
numread:word;
i,typ,stat:integer;
c:char;
begin
{* arc_proc - Process entry in ARC archive.
*}
repeat
c:=getbyte(fp);
typ:=ord(getbyte(fp)); {* get storage method *}
case typ of
0:exit; {* end of archive file *}
1,2:out.typ:=2; {* Stored *}
3,4:out.typ:=typ; {* Packed & Squeezed *}
5,6,7:out.typ:=typ; {* crunched *}
8,9,10:out.typ:=typ-2; {* Crunched, Squashed & Crushed *}
30:out.typ:=0; {* Directory *}
31:dec(level); {* end of dir (not displayed) *}
else
out.typ:=1; {* Unknown! *}
end;
if typ<>31 then begin {* get data from header *}
blockread(fp,arc,23,numread); if numread<>23 then abend(abort,next,errmsg[2]);
if abort then exit;
if typ=1 then {* type 1 didn't have c_size field *}
arc.u_size:=arc.c_size
else begin
blockread(fp,arc.u_size,4,numread);
if numread<>4 then abend(abort,next,errmsg[2]);
if abort then exit;
end;
i:=0;
repeat
inc(i);
out.filename[i]:=arc.filename[i-1];
until (arc.filename[i]=#0) or (i=13);
out.filename[0]:=chr(i);
out.date:=arc.mod_date;
out.time:=arc.mod_time;
if typ=30 then begin
arc.c_size:=0; {* set file size entries *}
arc.u_size:=0; {* to 0 for directories *}
end;
out.csize:=arc.c_size; {* set file size entries *}
out.usize:=arc.u_size; {* for normal files *}
details(abort,next); if abort then exit;
if typ<>30 then begin
{$I-} seek(fp,filepos(fp)+arc.c_size); {$I+} {* seek to next entry *}
if ioresult<>0 then abend(abort,next,errmsg[4]);
if abort then exit;
end;
end;
until (c<>#$1a) or (aborted);
if not aborted then abend(abort,next,errmsg[3]);
end;
{*------------------------------------------------------------------------*}
procedure zoo_proc(var fp:file; var abort,next:boolean);
var zoo:zoofilerec;
zoo_longname,zoo_dirname:string[255];
numread:word;
i,method:integer;
namlen,dirlen:byte;
begin
{* zoo_proc - Process entry in ZOO archive.
*}
while (not aborted) do begin {* set up infinite loop (exit is within loop) *}
blockread(fp,zoo,56,numread); if numread<>56 then abend(abort,next,errmsg[2]);
if abort then exit;
if zoo.tag<>Z_TAG then abend(abort,next,errmsg[3]); {* abort if invalid tag *}
if (abort) or (zoo.next=0) then exit;
namlen:=ord(getbyte(fp)); dirlen:=ord(getbyte(fp));
zoo_longname:=''; zoo_dirname:='';
if namlen>0 then
for i:=1 to namlen do {* get long filename *}
zoo_longname:=zoo_longname+getbyte(fp);
if dirlen>0 then begin
for i:=1 to dirlen do {* get directory name *}
zoo_dirname:=zoo_dirname+getbyte(fp);
if copy(zoo_dirname,length(zoo_dirname),1)<>'/' then
zoo_dirname:=zoo_dirname+'/';
end;
if zoo_longname<>'' then out.filename:=zoo_longname
else begin
i:=0;
repeat
inc(i);
out.filename[i]:=zoo.fname[i-1];
until (zoo.fname[i]=#0) or (i=13);
out.filename[0]:=chr(i);
out.filename:=zoo_dirname+out.filename;
end;
out.date:=zoo.mod_date; {* set up fields *}
out.time:=zoo.mod_time;
out.csize:=zoo.c_size;
out.usize:=zoo.u_size;
method:=zoo.method;
case method of
0:out.typ:=2; {* Stored *}
1:out.typ:=6; {* Crunched *}
else
out.typ:=1; {* Unknown! *}
end;
if not (zoo.deleted=1) then details(abort,next);
if abort then exit;
{$I-} seek(fp,zoo.next); {$I+} {* seek to next entry *}
if ioresult<>0 then abend(abort,next,errmsg[4]);
if abort then exit;
end;
end;
{*------------------------------------------------------------------------*}
procedure lzh_proc(var fp:file; var abort,next:boolean);
var lzh:lzhfilerec;
numread:word;
i:integer;
c:char;
begin
{* lzh_proc - Process entry in LZH archive.
*}
while (not aborted) do begin {* set up infinite loop (exit is within loop) *}
c:=getbyte(fp);
if (c=#0) then exit else lzh.h_length:=ord(c);
c:=getbyte(fp);
lzh.h_cksum:=ord(c);
blockread(fp,lzh.method,5,numread); if (numread<>5) then abend(abort,next,errmsg[2]);
if (abort) then exit;
if ((lzh.method[1]<>'-') or
(lzh.method[2]<>'l') or
(lzh.method[3]<>'h')) then abend(abort,next,errmsg[3]);
if (abort) then exit;
blockread(fp,lzh.c_size,15,numread); if (numread<>15) then abend(abort,next,errmsg[2]);
if (abort) then exit;
for i:=1 to lzh.f_length do out.filename[i]:=getbyte(fp);
out.filename[0]:=chr(lzh.f_length);
if (lzh.h_length-lzh.f_length=22) then begin
blockread(fp,lzh.crc,2,numread); if (numread<>2) then abend(abort,next,errmsg[2]);
if (abort) then exit;
end;
out.date:=lzh.mod_date; {* set up fields *}
out.time:=lzh.mod_time;
out.csize:=lzh.c_size;
out.usize:=lzh.u_size;
c:=lzh.method[4];
case c of
'0':out.typ:=2; {* Stored *}
'1':out.typ:=14; {* Frozen *}
else
out.typ:=1; {* Unknown! *}
end;
details(abort,next);
{$I-} seek(fp,filepos(fp)+lzh.c_size); {$I+} {* seek to next entry *}
if (ioresult<>0) then abend(abort,next,errmsg[4]);
if (abort) then exit;
end;
end;
end.