/
file3.pas
191 lines (171 loc) · 5.81 KB
/
file3.pas
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
{$A+,B+,D-,E+,F+,I+,L+,N-,O+,R-,S+,V-}
unit file3;
interface
uses
crt,dos,
{rcg11172000 no overlay under Linux.}
{overlay,}
file0,
common;
procedure arc_proc(var fp:file; var abort,next:boolean);
procedure zoo_proc(var fp:file; var abort,next:boolean);
procedure lzh_proc(var fp:file; var abort,next:boolean);
implementation
uses file4;
{*------------------------------------------------------------------------*}
procedure arc_proc(var fp:file; var abort,next:boolean);
var arc:arcfilerec;
numread:word;
i,typ,stat:integer;
c:char;
begin
{* arc_proc - Process entry in ARC archive.
*}
repeat
c:=getbyte(fp);
typ:=ord(getbyte(fp)); {* get storage method *}
case typ of
0:exit; {* end of archive file *}
1,2:out.typ:=2; {* Stored *}
3,4:out.typ:=typ; {* Packed & Squeezed *}
5,6,7:out.typ:=typ; {* crunched *}
8,9,10:out.typ:=typ-2; {* Crunched, Squashed & Crushed *}
30:out.typ:=0; {* Directory *}
31:dec(level); {* end of dir (not displayed) *}
else
out.typ:=1; {* Unknown! *}
end;
if typ<>31 then begin {* get data from header *}
blockread(fp,arc,23,numread); if numread<>23 then abend(abort,next,errmsg[2]);
if abort then exit;
if typ=1 then {* type 1 didn't have c_size field *}
arc.u_size:=arc.c_size
else begin
blockread(fp,arc.u_size,4,numread);
if numread<>4 then abend(abort,next,errmsg[2]);
if abort then exit;
end;
i:=0;
repeat
inc(i);
out.filename[i]:=arc.filename[i-1];
until (arc.filename[i]=#0) or (i=13);
out.filename[0]:=chr(i);
out.date:=arc.mod_date;
out.time:=arc.mod_time;
if typ=30 then begin
arc.c_size:=0; {* set file size entries *}
arc.u_size:=0; {* to 0 for directories *}
end;
out.csize:=arc.c_size; {* set file size entries *}
out.usize:=arc.u_size; {* for normal files *}
details(abort,next); if abort then exit;
if typ<>30 then begin
{$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.