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
|
unit avisozlib;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, paszlib;
type
Decode = class
public
procedure CHECK_ERR(err: Integer; msg: String);
procedure EXIT_ERR(const msg: String);
function test_inflate(compr: Pointer; comprLen : LongInt;
uncompr: Pointer; uncomprLen : LongInt): PChar;
constructor Create();
end;
implementation
procedure Decode.CHECK_ERR(err: Integer; msg: String);
begin
if err <> Z_OK then
begin
raise Exception.Create('ERROR: ' + msg);
Halt(1);
end;
end;
procedure Decode.EXIT_ERR(const msg: String);
begin
raise Exception.Create('ERROR: ' + msg);
Halt(1);
end;
function Decode.test_inflate(compr: Pointer; comprLen : LongInt;
uncompr: Pointer; uncomprLen : LongInt): PChar;
var err: Integer;
d_stream: TZStream; // decompression stream
begin
StrCopy(PChar(uncompr), 'garbage');
d_stream.next_in := compr;
d_stream.avail_in := 0;
d_stream.next_out := uncompr;
err := inflateInit(d_stream);
CHECK_ERR(err, 'inflateInit');
while (d_stream.total_out < uncomprLen) and
(d_stream.total_in < comprLen) do
begin
d_stream.avail_out := 1; // force small buffers
d_stream.avail_in := 1;
err := inflate(d_stream, Z_NO_FLUSH);
if err = Z_STREAM_END then
break;
CHECK_ERR(err, 'inflate');
end;
err := inflateEnd(d_stream);
CHECK_ERR(err, 'inflateEnd');
Result:=PChar(uncompr);
end;
constructor Decode.Create();
begin
inherited Create;
end;
end.
|
