-
Notifications
You must be signed in to change notification settings - Fork 1
/
tzxblockstandard.inc
49 lines (39 loc) · 1.13 KB
/
tzxblockstandard.inc
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
// Copyright 2022-2024 Zoran Vučenović
// SPDX-License-Identifier: Apache-2.0
{$ifdef tzx_header_section}
TTzxBlockStandard = class abstract (TTzxBlock)
strict protected
FLen: Integer;
function Load2(const Stream: TStream; L: Integer): Boolean; virtual; abstract;
public
constructor Create(ATapePlayer: TTapePlayer); override;
{returns whole block length, without id byte}
function GetBlockLength: Integer; override;
function LoadBlock(const Stream: TStream): Boolean; override;
end;
{$else}
constructor TTzxBlockStandard.Create(ATapePlayer: TTapePlayer);
begin
inherited Create(ATapePlayer);
FLen := 0;
end;
function {TTzxPlayer.}TTzxBlockStandard.GetBlockLength: Integer;
begin
Result := FLen;
end;
function {TTzxPlayer.}TTzxBlockStandard.LoadBlock(const Stream: TStream
): Boolean;
var
LL: UInt32;
L: Int32 absolute LL;
begin
Result := False;
if Stream.Size >= Stream.Position + 4 then begin
if Stream.Read(LL{%H-}, 4) = 4 then begin
LL := LEtoN(LL);
FLen := L + 4;
Result := (L >= 0) and ((L = 0) or ((Stream.Size - Stream.Position >= L) and Load2(Stream, L)));
end;
end;
end;
{$endif}