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C64D64Image.pas
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C64D64Image.pas
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//------------------------------------------------------------------------------
//C64D64Image
//===========
//Load, creates, manipulates and saves Commodore 1541, 1571 and 1581 (.D64,
//.D71, and .D81) disk image files.
//
//Please note:
//------------
//Presently, only FPC/Lazarus is supported. Delphi support is incomplete.
//Needs a class helper for TMemoryStream to include ReadByte (which I'm a fan
//of) or ReadByte changed to ReadBuffer.
//
//Copyright (C) 2016, Daniel England.
//All Rights Reserved. Released under the GPL.
//
//This program 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 3 of the License, or (at your option) any later
//version.
//
//This program 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.
//
//You should have received a copy of the GNU General Public License along with
//this program. If not, see <http://www.gnu.org/licenses/>.
//
//------------------------------------------------------------------------------
unit C64D64Image;
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$H+}
interface
uses
Classes, SysUtils;
const
// Size of a sector on a disk
VAL_SIZ_D64SECTRSIZE = 256;
VAL_SIZ_D64BLOCKSIZE = 254;
LIT_LBL_D64BLNKFLN = #$A0#$A0#$A0#$A0#$A0#$A0#$A0#$A0 +
#$A0#$A0#$A0#$A0#$A0#$A0#$A0#$A0;
VAL_TYP_D64FTYPE_DEL = 0;
VAL_TYP_D64FTYPE_SEQ = 1;
VAL_TYP_D64FTYPE_PRG = 2;
VAL_TYP_D64FTYPE_USR = 3;
VAL_TYP_D64FTYPE_REL = 4;
VAL_TYP_D64FTYPE_CBM = 5;
type
// Supported disk types (d71 images may be single or double sided. d81 images
// currently do not support directory partitions).
TD64DiskType = (ddt1541, ddt1571, ddt1581);
// Range of track numbers on a disk
TD64TrackNum = 1..80;
// Range of sector numbers on a track
TD64SectorNum = 0..39;
// Range of entry numbers in a sector
TD64EntryNum = 0..7;
// Data for a file entry on the disk
TD64EntryData = array[0..31] of Byte;
TD64FileType = 0..7;
TD64FileState = (dfsReadOnly, dfsReplacing, dfsClosed);
TD64FileStates = set of TD64FileState;
{ TD64DirEntry }
// Helper record for a directory file entry
TD64DirEntry = record
Track: TD64TrackNum;
Sector: TD64SectorNum;
EntryNum: TD64EntryNum;
FileType: Byte;
DataTrack: TD64TrackNum;
DataSector: TD64SectorNum;
FileName: AnsiString;
FileSize: Word;
EntryData: TD64EntryData;
//dengland These routines are primarily for manipulating the EntryData.
// EntryNum must still be logicially handled (etc).
// procedure SetTrack(const AValue: Byte);
// procedure SetSector(const AValue: Byte);
procedure SetFileType(const AValue: Byte);
procedure SetDataTS(const ATrack, ASector: Byte);
procedure SetFileName(const AName: string);
procedure SetRelTS(const ATrack, ASector: Byte);
procedure SetRelRecSize(const AValue: Byte);
procedure SetFileSize(const AValue: Word);
procedure SetGEOSInfoTS(const ATrack, ASector: Byte); //SetRelTS
procedure SetGEOSStructure(const AValue: Byte); //SetRelRecSize
procedure SetGEOSFileType(const AValue: Byte);
procedure SetGEOSYear(const AYear: Word); //The actual year
procedure SetGEOSMonth(const AValue: Byte);
procedure SetGEOSDay(const AValue: Byte);
procedure SetGEOSHour(const AValue: Byte);
procedure SetGEOSMinute(const AValue: Byte);
procedure SetGEOSDateTime(const ADateTime: TDateTime);
end;
TD64DirEntries = array of TD64DirEntry;
// Important directory partition info
TD64DirPartitionInfo = record
Track: TD64TrackNum;
PartSize: Word;
end;
// Directory partition information helper record
TD64DirPartition = record
Info: TD64DirPartitionInfo;
PartFileName,
PartDiskName,
PartDiskID,
PartDOSType: AnsiString;
HasChildren: Boolean;
Depth: Integer;
Parent: Integer;
end;
TD64DirPartitions = array of TD64DirPartition;
// BAM info for a disk track
TD64TrackBAM = record
FreeSectors: Byte;
Bitmap: array of Byte;
end;
// BAM info for the disk
TD64DiskBAM = array of TD64TrackBAM;
type
{ TD64Image }
// Class for loading, creating and manipulating a .d64, .d71 or .d81 disk image
TD64Image = class(TObject)
private
FData: TMemoryStream;
FDiskType: TD64DiskType;
FSingleSide: Boolean;
FTrkCount: TD64TrackNum;
FMaxSectors: Byte;
FValidVersion: Boolean;
FDOSVersion: Byte;
FDiskName: AnsiString;
FDiskID: AnsiString;
FDOSType: AnsiString;
FGEOSDisk: Boolean;
FGEOSVerMajor: Byte;
FGEOSVerMinor: Byte;
FCurrPartTrk: Byte;
FCurrPartSiz: Word;
procedure DoLoadFromFile(const AFile: string);
procedure DoSaveToFile(const AFile: string);
function DoValidateTrackSector(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum): Word;
procedure DoGetSector(const ANum: Word; ADest: TStream);
procedure DoGetFileEntries(const AStream: TMemoryStream;
const ATrack: TD64TrackNum; const ASector: TD64SectorNum;
var AEntries: TD64DirEntries; const AFullList: Boolean = False);
function DoGet1581BAM(const AStream: TMemoryStream;
const ATrack: TD64TrackNum; const ATrkCnt: Byte;
var ABAM: TD64DiskBAM): Integer;
procedure DoWriteTrackSectorNextPointer(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; const ANxtTrack: Byte;
const ANxtSector: Byte; out AData: PByte);
procedure DoAnalyseDOSDetails;
procedure DoAllocateNewSector(var ABAM: TD64DiskBAM;
out ATrack: TD64TrackNum; out ASector: TD64SectorNum;
const AAllocate: Boolean = True);
procedure DoDeallocateSectorChain(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; var ABAM: TD64DiskBAM);
procedure DoWriteSector(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; const ANxtTrack: Byte;
const ANxtSector: Byte; const AStream: TStream);
procedure DoAllocateDirEntry(const AEntryData: TD64EntryData);
procedure DoWriteDiskBAM(const ABAM: TD64DiskBAM);
public
constructor Create; overload;
//dengland Using this constructor when the file is share locked causes the
// LCL runtime to abort and the application to abnormally terminate. :(
constructor Create(const AFile: string); overload;
destructor Destroy; override;
// Load an image from a file. The DiskType will be detected by the filename.
procedure LoadFromFile(const AFile: string);
// Save the current image to a file.
procedure SaveToFile(const AFile: string);
// Format a new disk image. The disk name, id and type must be specified.
// Optionally, you can create a GEOS compatible disk image.
procedure FormatImage(const ADiskName: AnsiString; const ADiskID: AnsiString;
const ADiskType: TD64DiskType; const ASingleSide: Boolean = False;
const AGEOSDisk: Boolean = False);
// Return whether or not an entry refers to a partition and its data position
function IsDirectoryPartition(const AEntry: TD64DirEntry;
out ADataPos: Cardinal): Boolean; inline;
// Return the number of sectors on the given track.
function GetSectorsForTrack(const ATrack: TD64TrackNum): Byte; inline;
// Get the whole of the sector data for a given track and sector.
procedure GetRawSector(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; ADest: TStream);
// Read the data for a chain of tracks and sectors, starting at the given
// track and sector. The track and sector link data is not returned
// but the whole data of the last sector is. The returned actual size
// should be checked for manipulating the returned file data.
procedure GetDataChain(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; ADest: TStream;
out ActualSize: Cardinal);
// Get the file entries on the disk directory.
procedure GetFileEntries(var AEntries: TD64DirEntries;
const AFullList: Boolean = False);
// Get the BAM information for the disk.
function GetDiskBAM(var ADiskBAM: TD64DiskBAM): Integer;
// Get the total number of blocks on the disk
function GetDiskBlockCount: Integer;
// Allocate disk sectors for the data in the given stream. Allocates as
// many sectors as required to store the whole of the stream from its
// current position. The start track and sector is returned as well
// as the total number of sectors used (blocks).
procedure AllocateDiskSectors(const AStream: TStream;
out AStartTrk: TD64TrackNum;
out AStartSec: TD64SectorNum; out ABlocksUsed: Word);
// Allocates a new file entry for the given file entry data. Does not
// attempt to replace existing files with the same name. Will allocate
// new director sectors as required.
procedure AllocateFileEntry(const AEntryData: TD64EntryData);
// Deletes the given file from the disk, including freeing all of the
// sectors used by the file in the BAM. Automatically detects GEOS
// files and handles them appropriately.
procedure ScratchFileEntry(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; const AEntry: TD64EntryNum);
// Replace a given file entry with given data
procedure ReplaceFileEntry(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum; const AEntry: TD64EntryNum;
const AEntryData: TD64EntryData);
// Get a array of directory compatible partitions.
procedure GetDirPartitions(var AParts: TD64DirPartitions);
// Set the current directory partition. Use GetDirPartitions to get the
// required information. Returns the previous partition info.
procedure SetCurrentPartition(const AInfo: TD64DirPartitionInfo); overload;
// Set the current directory partition. Use GetDirPartitions to get the
// required information.
procedure SetCurrentPartition(const AInfo: TD64DirPartitionInfo;
out APrev: TD64DirPartitionInfo); overload;
// Get the file entries for the current directory partition.
procedure GetPartitionFiles(var AEntries: TD64DirEntries);
// Get the BAM information for the current directory partition.
procedure GetPartitionBAM(var ADiskBAM: TD64DiskBAM);
// The current disk type
property DiskType: TD64DiskType read FDiskType;
// If a d71 image, whether the image is a single or double sided one.
property SingleSide: Boolean read FSingleSide;
// The total number of tracks in the current image.
property TrackCount: TD64TrackNum read FTrkCount;
// The maximum number of sectors on a track.
property MaxSectors: Byte read FMaxSectors;
// Whether the disk has valid DOS information. Uses only very minimal checks.
property ValidVersion: Boolean read FValidVersion;
// The disk DOS version.
property DOSVersion: Byte read FDOSVersion;
// The disk name.
property DiskName: AnsiString read FDiskName;
// The disk ID.
property DiskID: AnsiString read FDiskID;
// The DOS type.
property DOSType: AnsiString read FDOSType;
// Whether the disk is a GEOS disk.
property GEOSDisk: Boolean read FGEOSDisk;
// The major version of the GEOS format if a GEOS disk.
property GEOSVerMajor: Byte read FGEOSVerMajor;
// The minor version of the GEOS format if a GEOS disk.
property GEOSVerMinor: Byte read FGEOSVerMinor;
end;
// Base class for D64Image exceptions (for filtering)
D64ImageException = class(Exception);
// An exception raised when the disk file does not exist.
ED64FileDoesNotExist = class(D64ImageException);
// An exception raised when the disk file format cannot be determined.
ED64UnknownFormat = class(D64ImageException);
// An exception raised when an invalid sector is selected.
ED64InvalidSector = class(D64ImageException);
// An exception raised when the disk file cannot be opened.
ED64UnableToOpen = class(D64ImageException);
// An exception raised when the disk is full.
ED64DiskFull = class(D64ImageException);
//Convert the given DOS file type byte to a AnsiString (as per BASIC, with or
// without splat and read-only markers)
function D64FileTypeToStr(const AType: Byte;
const AStateFlags: Boolean = True): AnsiString;
//Convert the given GEOS file structure byte into a AnsiString.
function D64GEOSStructToStr(const AStruct: Byte): AnsiString;
//Convert the given GEOS file type into a AnsiString.
function D64GEOSFileTypeToStr(const AType: Byte): AnsiString;
procedure D64DecodeFileType(const AType: Byte; out AFileType: TD64FileType;
out AFileStates: TD64FileStates);
function D64EncodeFileType(const AFileType: TD64FileType;
const AFileStates: TD64FileStates): Byte;
implementation
uses
C64D64ImageStrs;
const
ARR_VAL_D64TRKSECTRS: array[1..40] of Byte = (
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, //1-17
19, 19, 19, 19, 19, 19, 19, //18-24
18, 18, 18, 18, 18, 18, //25-30
17, 17, 17, 17, 17, 17, 17, 17, 17, 17); //31-40
ARR_VAL_D71TRKSECTRS: array[1..70] of Byte = (
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, //1-17
19, 19, 19, 19, 19, 19, 19, //18-24
18, 18, 18, 18, 18, 18, //25-30
17, 17, 17, 17, 17, //31-35
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, //36-52
19, 19, 19, 19, 19, 19, 19, //53-59
18, 18, 18, 18, 18, 18, //60-65
17, 17, 17, 17, 17); //66-70
LIT_TOK_D64GEOSFMT = 'GEOS format';
LIT_TOK_D64FTYPDEL = 'DEL';
LIT_TOK_D64FTYPSEQ = 'SEQ';
LIT_TOK_D64FTYPPRG = 'PRG';
LIT_TOK_D64FTYPUSR = 'USR';
LIT_TOK_D64FTYPREL = 'REL';
LIT_TOK_D64FTYPCBM = 'CBM';
LIT_TOK_D64FTYPUNK = '???';
LIT_TOK_D64GEOSSEQ = 'Sequential';
LIT_TOK_D64GEOSVLR = 'GEOS VLIR';
LIT_TOK_D64GEOSUNK = 'Unknown';
LIT_TOK_D64GEOSNGS = 'Not a GEOS file';
LIT_TOK_D64GEOSBAS = 'BASIC';
LIT_TOK_D64GEOSASM = 'Assembler';
LIT_TOK_D64GEOSDAT = 'Data file';
LIT_TOK_D64GEOSSYS = 'System File';
LIT_TOK_D64GEOSDSA = 'Desk Accessory';
LIT_TOK_D64GEOSAPP = 'Application';
LIT_TOK_D64GEOSAPD = 'Application Data';
LIT_TOK_D64GEOSFNT = 'Font File';
LIT_TOK_D64GEOSPRN = 'Printer Driver';
LIT_TOK_D64GEOSINP = 'Input Driver';
LIT_TOK_D64GEOSDSK = 'Disk Driver/Device';
LIT_TOK_D64GEOSSBT = 'System Boot File';
LIT_TOK_D64GEOSTMP = 'Temporary';
LIT_TOK_D64GEOSAEX = 'Auto-Execute File';
procedure D64DecodeFileType(const AType: Byte; out AFileType: TD64FileType;
out AFileStates: TD64FileStates);
begin
AFileType:= AType and $07;
AFileStates:= [];
if (AType and $20) <> 0 then
Include(AFileStates, dfsReplacing);
if (AType and $40) <> 0 then
Include(AFileStates, dfsReadOnly);
if (AType and $80) <> 0 then
Include(AFileStates, dfsClosed);
end;
function D64EncodeFileType(const AFileType: TD64FileType;
const AFileStates: TD64FileStates): Byte;
begin
Result:= AFileType;
if dfsReplacing in AFileStates then
Result:= Result or $20;
if dfsReadOnly in AFileStates then
Result:= Result or $40;
if dfsClosed in AFileStates then
Result:= Result or $80;
end;
function D64FileTypeToStr(const AType: Byte; const AStateFlags: Boolean): AnsiString;
begin
case AType and $0F of
0:
Result:= LIT_TOK_D64FTYPDEL;
1:
Result:= LIT_TOK_D64FTYPSEQ;
2:
Result:= LIT_TOK_D64FTYPPRG;
3:
Result:= LIT_TOK_D64FTYPUSR;
4:
Result:= LIT_TOK_D64FTYPREL;
5:
Result:= LIT_TOK_D64FTYPCBM;
else
Result:= LIT_TOK_D64FTYPUNK;
end;
if AStateFlags then
begin
if (AType and $40) <> 0 then
Result:= Result + '<'
else
Result:= Result + ' ';
if (AType and $80) = 0 then
Result:= '*' + Result
else
Result:= ' ' + Result;
end;
end;
function D64GEOSStructToStr(const AStruct: Byte): AnsiString;
begin
case AStruct of
$00:
Result:= LIT_TOK_D64GEOSSEQ;
$01:
Result:= LIT_TOK_D64GEOSVLR;
else
Result:= LIT_TOK_D64GEOSUNK + Format(' ($%2.2x)', [AStruct]);
end;
end;
function D64GEOSFileTypeToStr(const AType: Byte): AnsiString;
begin
case AType of
$00:
Result:= LIT_TOK_D64GEOSNGS;
$01:
Result:= LIT_TOK_D64GEOSBAS;
$02:
Result:= LIT_TOK_D64GEOSASM;
$03:
Result:= LIT_TOK_D64GEOSDAT;
$04:
Result:= LIT_TOK_D64GEOSSYS;
$05:
Result:= LIT_TOK_D64GEOSDSA;
$06:
Result:= LIT_TOK_D64GEOSAPP;
$07:
Result:= LIT_TOK_D64GEOSAPD;
$08:
Result:= LIT_TOK_D64GEOSFNT;
$09:
Result:= LIT_TOK_D64GEOSPRN;
$0A:
Result:= LIT_TOK_D64GEOSINP;
$0B:
Result:= LIT_TOK_D64GEOSDSK;
$0C:
Result:= LIT_TOK_D64GEOSSBT;
$0D:
Result:= LIT_TOK_D64GEOSTMP;
$0E:
Result:= LIT_TOK_D64GEOSAEX;
else
Result:= LIT_TOK_D64GEOSUNK + Format(' ($%2.2x)', [AType]);
end;
end;
{ TD64DirEntry }
//procedure TD64DirEntry.SetTrack(const AValue: Byte);
// begin
// Track:= TD64TrackNum(AValue);
// EntryData[0]:= AValue;
// end;
//procedure TD64DirEntry.SetSector(const AValue: Byte);
// begin
// Sector:= AValue;
// EntryData[1]:= AValue
// end;
procedure TD64DirEntry.SetFileType(const AValue: Byte);
begin
FileType:= AValue;
EntryData[2]:= AValue;
end;
procedure TD64DirEntry.SetDataTS(const ATrack, ASector: Byte);
begin
EntryData[3]:= ATrack;
EntryData[4]:= ASector;
end;
procedure TD64DirEntry.SetFileName(const AName: AnsiString);
var
i: Integer;
begin
FileName:= Copy(AName + LIT_LBL_D64BLNKFLN, 1, 16);
for i:= $05 to $14 do
EntryData[i]:= Byte(AnsiChar(FileName[i - $04]));
end;
procedure TD64DirEntry.SetRelTS(const ATrack, ASector: Byte);
begin
EntryData[$15]:= ATrack;
EntryData[$16]:= ASector;
end;
procedure TD64DirEntry.SetRelRecSize(const AValue: Byte);
begin
EntryData[$17]:= AValue;
end;
procedure TD64DirEntry.SetFileSize(const AValue: Word);
begin
EntryData[$1E]:= Byte(AValue and $FF);
EntryData[$1F]:= Byte((AValue and $FF00) shr 8);
end;
procedure TD64DirEntry.SetGEOSInfoTS(const ATrack, ASector: Byte);
begin
SetRelTS(ATrack, ASector);
end;
procedure TD64DirEntry.SetGEOSStructure(const AValue: Byte);
begin
SetRelRecSize(AValue);
end;
procedure TD64DirEntry.SetGEOSFileType(const AValue: Byte);
begin
EntryData[$18]:= AValue;
end;
procedure TD64DirEntry.SetGEOSYear(const AYear: Word);
begin
EntryData[$19]:= Byte(AYear - 1900);
end;
procedure TD64DirEntry.SetGEOSMonth(const AValue: Byte);
begin
EntryData[$1A]:= AValue;
end;
procedure TD64DirEntry.SetGEOSDay(const AValue: Byte);
begin
EntryData[$1B]:= AValue;
end;
procedure TD64DirEntry.SetGEOSHour(const AValue: Byte);
begin
EntryData[$1C]:= AValue;
end;
procedure TD64DirEntry.SetGEOSMinute(const AValue: Byte);
begin
EntryData[$1D]:= AValue;
end;
procedure TD64DirEntry.SetGEOSDateTime(const ADateTime: TDateTime);
var
yr,
mo,
dy,
hr,
mn,
sc,
ms: Word;
begin
DecodeDate(ADateTime, yr, mo, dy);
DecodeTime(ADateTime, hr, mn, sc, ms);
SetGEOSYear(yr);
SetGEOSMonth(mo);
SetGEOSDay(dy);
SetGEOSHour(hr);
SetGEOSMinute(mn);
end;
{ TD64Image }
procedure TD64Image.DoLoadFromFile(const AFile: string);
var
f: TFileStream;
begin
if FileExists(AFile) then
try
f:= TFileStream.Create(AFile, fmShareCompat or fmOpenRead);
try
if CompareText(ExtractFileExt(AFile), '.D64') = 0 then
begin
// 35 track, no errors 174848
// 35 track, 683 error bytes 175531
// 40 track, no errors 196608
// 40 track, 768 error bytes 197376
if (f.Size = 174848)
or (f.Size = 175531) then
FTrkCount:= 35
else if (f.Size = 196608)
or (f.Size = 197376) then
FTrkCount:= 40
else
raise ED64UnknownFormat.Create(
Format(STR_FMT_D64FORMATUNK, [AFile]));
FDiskType:= ddt1541;
FSingleSide:= True;
end
else if CompareText(ExtractFileExt(AFile), '.D71') = 0 then
begin
// 35 track, no errors 174848
// 35 track, 683 error bytes 175531
// 70 tracks, 349696 bytes.
// 70 tracks, 351062, with error bytes.
if (f.Size = 174848)
or (f.Size = 175531) then
begin
FTrkCount:= 35;
FSingleSide:= True;
end
else if (f.Size = 349696)
or (f.Size = 351062) then
begin
FTrkCount:= 70;
FSingleSide:= False;
end
else
raise ED64UnknownFormat.Create(
Format(STR_FMT_D64FORMATUNK, [AFile]));
FDiskType:= ddt1571;
end
else if CompareText(ExtractFileExt(AFile), '.D81') = 0 then
begin
// 819200 bytes,
// 822400 bytes with errors.
if (f.Size = 819200)
or (f.Size = 822400) then
begin
FTrkCount:= 80;
FSingleSide:= False;
end
else
raise ED64UnknownFormat.Create(
Format(STR_FMT_D64FORMATUNK, [AFile]));
FDiskType:= ddt1581;
end
else
raise ED64UnknownFormat.Create(Format(STR_FMT_D64EXTNSNUNK,
[AFile]));
FData.Clear;
FData.CopyFrom(f, f.Size);
finally
f.Free;
end
except
raise ED64UnableToOpen.Create(Format(STR_FMT_D64FILENOTOP, [AFile]));
end
else
raise ED64FileDoesNotExist.Create(Format(STR_FMT_D64FILENOTEX, [AFile]));
if FDiskType in [ddt1541, ddt1571] then
FMaxSectors:= 21
else
FMaxSectors:= 40;
DoAnalyseDOSDetails;
end;
procedure TD64Image.DoSaveToFile(const AFile: string);
begin
//dengland Should do some sanity checking on file extension and DiskType
//fixme dengland Sanity check DoSaveToFile
FData.Position:= 0;
FData.SaveToFile(AFile);
end;
function TD64Image.DoValidateTrackSector(const ATrack: TD64TrackNum;
const ASector: TD64SectorNum): Word;
var
i: TD64TrackNum;
begin
if FTrkCount >= ATrack then
if (GetSectorsForTrack(ATrack) - 1) >= ASector then
begin
Result:= 0;
i:= 1;
while i < ATrack do
begin
Inc(Result, GetSectorsForTrack(i));
Inc(i);
end;
Inc(Result, Ord(ASector));
end
else
raise ED64InvalidSector.Create(
Format(STR_FMT_D64SECOUTRNG, [Ord(ATrack), Ord(ASector)]))
else
raise ED64InvalidSector.Create(
Format(STR_FMT_D64TRKOUTRNG, [Ord(ATrack)]));
end;
procedure TD64Image.DoGetSector(const ANum: Word; ADest: TStream);
begin
FData.Position:= ANum * VAL_SIZ_D64SECTRSIZE;
ADest.CopyFrom(FData, VAL_SIZ_D64SECTRSIZE);
end;
procedure TD64Image.DoGetFileEntries(const AStream: TMemoryStream;
const ATrack: TD64TrackNum; const ASector: TD64SectorNum;
var AEntries: TD64DirEntries; const AFullList: Boolean);
var
b,
nt,
ns: Byte;
fs: Word;
fn: AnsiString;
x,
i: Integer;
e: Byte;
fe: TD64DirEntry;
z: Integer;
begin
nt:= ATrack;
ns:= ASector;
x:= 0;
repeat
// SetLength(AEntries, Length(AEntries) + 8);
AStream.Clear;
GetRawSector(nt, ns, AStream);
AStream.Position:= 0;
for e:= 0 to 7 do
begin
fe.Track:= nt;
fe.Sector:= ns;
fe.EntryNum:= e;
AStream.Position:= e * $20;
for i:= 0 to $1F do
fe.EntryData[i]:= AStream.ReadByte;
AStream.Position:= e * $20 + 2;
fe.FileType:= AStream.ReadByte;
b:= AStream.ReadByte;
if (not AFullList)
and (b = 0) then
Continue;
fe.DataTrack:= b;
fe.DataSector:= AStream.ReadByte;
// AStream.Position:= AStream.Position + 2;
fn:= '';
for i:= 0 to 15 do
begin
b:= AStream.ReadByte;
// if b in [$20..$7E] then
fn:= fn + AnsiChar(b);
// else
// fn:= fn + ' ';
end;
fe.FileName:= fn;
AStream.Position:= AStream.Position + 9;
b:= AStream.ReadByte;
fs:= b;
b:= AStream.ReadByte;
fs:= fs + b shl 8;
fe.FileSize:= fs;
z:= SizeOf(TD64DirEntry);
SetLength(AEntries, Length(AEntries) + 1);
AEntries[x]:= fe;
Inc(x);
end;
AStream.Position:= 0;
nt:= AStream.ReadByte;
ns:= AStream.ReadByte;
until nt = 0;
end;
function TD64Image.DoGet1581BAM(const AStream: TMemoryStream;
const ATrack: TD64TrackNum; const ATrkCnt: Byte;
var ABAM: TD64DiskBAM): Integer;
var
x,
s,
o,
i,
j: Integer;
begin
Result:= 0;
x:= 0;
for s:= 0 to 1 do
begin
o:= s * 40;
AStream.Clear;
GetRawSector(ATrack, s + 1, AStream);
AStream.Position:= $10;
for i:= 0 to 39 do
begin
ABAM[o + i].FreeSectors:= AStream.ReadByte;
Inc(Result, ABAM[o + i].FreeSectors);
for j:= 0 to 4 do
ABAM[o + i].Bitmap[j]:= AStream.ReadByte;
Inc(x);
//dengland This is just as nasty as a darn goto.
if x = ATrkCnt then
Exit;
end;
end;
end;
procedure TD64Image.DoAnalyseDOSDetails;
var
p: Cardinal;
b: Byte;
i: Byte;
s: AnsiString;
begin
if FDiskType in [ddt1541, ddt1571] then
begin
FCurrPartTrk:= 0;
FCurrPartSiz:= 0;
end
else
begin
FCurrPartTrk:= 40;
FCurrPartSiz:= 3200;
end;
FDiskName:= EmptyStr;
FDiskID:= EmptyStr;
FDOSType:= EmptyStr;
if FDiskType in [ddt1541, ddt1571] then
p:= DoValidateTrackSector(18, 0) * VAL_SIZ_D64SECTRSIZE
else
p:= DoValidateTrackSector(40, 0) * VAL_SIZ_D64SECTRSIZE;
FData.Position:= p + 2;
FDOSVersion:= FData.ReadByte;
FValidVersion:=
((FDiskType in [ddt1541, ddt1571]) and (FDOSVersion = $41)) or
((FDiskType = ddt1581) and (FDOSVersion = $44));
if FDiskType = ddt1571 then
begin
FData.Position:= p + 3;
b:= FData.ReadByte;
if ((not FSingleSide)
and (b = $00))
or (FSingleSide
and (b = $80)) then
FValidVersion:= False;
end;
if FValidVersion then
begin
if FDiskType = ddt1581 then
FData.Position:= p + $04
else
FData.Position:= p + $90;
for i:= 0 to 15 do
begin
b:= FData.ReadByte;
// if b in [$20..$7E] then
FDiskName:= FDiskName + AnsiChar(b);
// else
// FDiskName:= FDiskName + ' ';
end;
if FDiskType = ddt1581 then
FData.Position:= p + $16
else
FData.Position:= p + $A2;
for i:= 0 to 1 do
begin
b:= FData.ReadByte;
// if b in [$20..$7E] then
FDiskID:= FDiskID + AnsiChar(b);
// else
// FDiskID:= FDiskID + ' ';
end;
if FDiskType = ddt1581 then
FData.Position:= p + $19
else
FData.Position:= p + $A5;
for i:= 0 to 1 do
begin
b:= FData.ReadByte;
// if b in [$20..$7E] then
FDOSType:= FDOSType + AnsiChar(b);
// else
// FDOSType:= FDOSType + ' ';
end;
FData.Position:= p + $AD;
s:= '';
for i:= 0 to 10 do
begin
b:= FData.ReadByte;
// if b in [$20..$7E] then
s:= s + AnsiChar(b);
// else
// s:= s + ' ';
end;
FGEOSDisk:= CompareStr(s, LIT_TOK_D64GEOSFMT) = 0;
if FGEOSDisk then
begin
FData.ReadByte;
FData.ReadByte;
FGEOSVerMajor:= StrToInt(AnsiString(AnsiChar(FData.ReadByte)));
FData.ReadByte;
FGEOSVerMinor:= StrToInt(AnsiString(AnsiChar(FData.ReadByte)));
end;
end;
end;
procedure TD64Image.DoAllocateNewSector(var ABAM: TD64DiskBAM;
out ATrack: TD64TrackNum; out ASector: TD64SectorNum;
const AAllocate: Boolean);
var
i,
j: Integer;
d: Byte;
begin
//dengland Not going to try to do disk type interleave at this point.
for i:= 0 to FTrkCount - 1 do
begin
//dengland Don't allocate in directory tracks
if (FDiskType in [ddt1541, ddt1571])
and (i = 17) then
Continue
else if (FDiskType = ddt1581)
and (i = 39) then
Continue;
if ABAM[i].FreeSectors > 0 then
begin
ATrack:= TD64TrackNum(i + 1);
if AAllocate then
Dec(ABAM[i].FreeSectors);