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tzxblock26.inc
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tzxblock26.inc
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// Copyright 2022-2024 Zoran Vučenović
// SPDX-License-Identifier: Apache-2.0
{$ifdef tzx_header_section}
{ TTzxBlock26 }
TTzxBlock26 = class (TTzxBlock)
strict private
CallBlockNumbers: array of Int16;
NumOfCalls: Integer;
public
constructor Create(ATapePlayer: TTapePlayer); override;
class function GetBlockId: DWord; override;
{returns whole block length, without id byte}
function GetBlockLength: Integer; override;
function LoadBlock(const Stream: TStream): Boolean; override;
class function GetBlockDescription: String; override;
function GetNumOfCalls: Integer; override;
function GetCallBlockNumber(const I: Integer): Integer; override;
procedure Details(out S: String); override;
end;
{$else}
constructor TTzxBlock26.Create(ATapePlayer: TTapePlayer);
begin
inherited Create(ATapePlayer);
NumOfCalls := 0;
SetLength(CallBlockNumbers, 0);
end;
class function {TTzxPlayer.}TTzxBlock26.GetBlockId: DWord;
begin
Result := $26;
end;
function {TTzxPlayer.}TTzxBlock26.GetBlockLength: Integer;
begin
Result := 2 + 2 * Length(CallBlockNumbers);
end;
function {TTzxPlayer.}TTzxBlock26.LoadBlock(const Stream: TStream): Boolean;
var
W: Word;
I: Integer;
begin
Result := False;
if Stream.Size >= Stream.Position + 2 then begin
if Stream.Read(W{%H-}, 2) = 2 then begin
W := LEtoN(W);
NumOfCalls := W;
if Stream.Size >= Stream.Position + 2 * Int64(NumOfCalls) then begin
SetLength(CallBlockNumbers, NumOfCalls);
for I := 0 to NumOfCalls - 1 do begin
if Stream.Read(W, 2) <> 2 then
Exit;
Word(CallBlockNumbers[I]) := LEtoN(W);
end;
Result := True;
end;
end;
end;
end;
class function {TTzxPlayer.}TTzxBlock26.GetBlockDescription: String;
begin
Result := 'Call sequence';
end;
function {TTzxPlayer.}TTzxBlock26.GetNumOfCalls: Integer;
begin
Result := NumOfCalls;
end;
function {TTzxPlayer.}TTzxBlock26.GetCallBlockNumber(const I: Integer): Integer;
begin
if (I >= 0) and (I < NumOfCalls) then
Result := CallBlockNumbers[I]
else
Result := inherited GetCallBlockNumber(I);
end;
procedure {TTzxPlayer.}TTzxBlock26.Details(out S: String);
var
I: Integer;
MaybeComma: String;
begin
S := Format('Number of calls: %d%sblocks (relative): ', [NumOfCalls, #13]);
MaybeComma := '';
for I := 0 to NumOfCalls - 1 do begin
S := S + MaybeComma + IntToStr(CallBlockNumbers[I]);
MaybeComma := ', ';
end;
end;
{$endif}