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{ IHX (Intel Hex format) to TZX (ZX Spectrum tape file format) convertor tool.
This file contains the TZX writer code.
Copyright (C) 2020 Nikolay Nikolov <nickysn@users.sourceforg.net>
This source is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This code is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
A copy of the GNU General Public License is available on the World Wide Web
at <http://www.gnu.org/copyleft/gpl.html>. You can also obtain it by writing
to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1335, USA.
}
unit tzxwriter;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
{ TTZXWriter }
TTZXWriter = class
private
FOutStream: TStream;
public
constructor Create(OutStream : TStream);
procedure AppendStandardSpeedDataBlock(const Buffer; Count: Word);
procedure AppendHeader(FileType: Byte; const FileName: string; DataBlockLength, Parameter1, Parameter2: Word);
procedure AppendDataBlock(const Buffer; Count: Word);
procedure AppendProgramFile(const FileName: string; AutostartLine, VarAreaOffset: Word; const Buffer; Count: Word);
procedure AppendCodeFile(const FileName: string; StartAddress: Word; const Buffer; Count: Word);
end;
implementation
{ TTZXWriter }
constructor TTZXWriter.Create(OutStream: TStream);
const
Header: string = 'ZXTape!'#$1A#1#20;
begin
FOutStream := OutStream;
FOutStream.Seek(0, soFromBeginning);
FOutStream.Write(Header[1], Length(Header));
end;
procedure TTZXWriter.AppendStandardSpeedDataBlock(const Buffer; Count: Word);
const
PauseMilliseconds = 1000;
begin
FOutStream.WriteByte($10);
FOutStream.WriteByte(Byte(PauseMilliseconds));
FOutStream.WriteByte(Byte(PauseMilliseconds shr 8));
FOutStream.WriteByte(Byte(Count));
FOutStream.WriteByte(Byte(Count shr 8));
FOutStream.Write(Buffer, Count);
end;
procedure TTZXWriter.AppendHeader(FileType: Byte; const FileName: string;
DataBlockLength, Parameter1, Parameter2: Word);
var
HeaderBlock: array [0..18] of Byte;
I: Integer;
Checksum: Byte;
begin
HeaderBlock[0] := 0; { header }
HeaderBlock[1] := FileType;
{ file name }
for I := 1 to 10 do
if I <= Length(FileName) then
HeaderBlock[I + 1] := Ord(FileName[I])
else
HeaderBlock[I + 1] := Ord(' ');
HeaderBlock[12] := Byte(DataBlockLength);
HeaderBlock[13] := Byte(DataBlockLength shr 8);
HeaderBlock[14] := Byte(Parameter1);
HeaderBlock[15] := Byte(Parameter1 shr 8);
HeaderBlock[16] := Byte(Parameter2);
HeaderBlock[17] := Byte(Parameter2 shr 8);
Checksum := 0;
for I := 0 to 17 do
Checksum := Checksum xor HeaderBlock[I];
HeaderBlock[18] := Checksum;
AppendStandardSpeedDataBlock(HeaderBlock, SizeOf(HeaderBlock));
end;
procedure TTZXWriter.AppendDataBlock(const Buffer; Count: Word);
var
I: Integer;
Checksum: Byte;
DataBlock: array of Byte;
begin
SetLength(DataBlock, Count + 2);
Move(Buffer, DataBlock[1], Count);
DataBlock[0] := $FF; { data }
Checksum := 0;
for I := 0 to High(DataBlock) - 1 do
Checksum := Checksum xor DataBlock[I];
DataBlock[High(DataBlock)] := Checksum;
AppendStandardSpeedDataBlock(DataBlock[0], Length(DataBlock));
end;
procedure TTZXWriter.AppendProgramFile(const FileName: string; AutostartLine,
VarAreaOffset: Word; const Buffer; Count: Word);
begin
AppendHeader(0, FileName, Count, AutostartLine, VarAreaOffset);
AppendDataBlock(Buffer, Count);
end;
procedure TTZXWriter.AppendCodeFile(const FileName: string; StartAddress: Word;
const Buffer; Count: Word);
begin
AppendHeader(3, FileName, Count, StartAddress, 32768);
AppendDataBlock(Buffer, Count);
end;
end.
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