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ucdimage.pas
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ucdimage.pas
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unit ucdimage;
interface
uses
utim;
const
cSectorHeaderSize = 12;
cSectorAddressSize = 3;
cSectorModeSize = 1;
cSectorSubHeaderSize = 8;
cSectorInfoSize = cSectorHeaderSize + cSectorAddressSize + cSectorModeSize +
cSectorSubHeaderSize;
cSectorDataSize = 2048;
cSectorECCSize = 4;
cSectorEDCSize = 276;
cSectorECCEDCSize = cSectorECCSize + cSectorEDCSize;
cSectorSize = cSectorInfoSize + cSectorDataSize + cSectorECCEDCSize;
type
TCDSector = packed record
dwHeader: array [0 .. cSectorHeaderSize - 1] of byte;
dwAddress: array [0 .. cSectorAddressSize - 1] of byte;
bMode: byte;
dwSubHeader: array [0 .. cSectorSubHeaderSize - 1] of byte;
dwData: array [0 .. cSectorDataSize - 1] of byte;
dwECC: array [0 .. cSectorECCSize - 1] of byte;
dwEDC: array [0 .. cSectorEDCSize - 1] of byte;
end;
PCDSector = ^TCDSector;
function GetImageScan(const FileName: string): Boolean;
function ReplaceTimInFile(const FileName, TimToInsert: string; InsertTo: Integer;
ImageScan: Boolean): Boolean;
procedure ReplaceTimInFileFromMemory(const FileName: string; TIM: PTIM;
InsertTo: Integer; ImageScan: Boolean);
implementation
uses
ucommon, ecc, edc, classes, FileUtil, sysutils;
function bin2bcd(P: Integer): byte;
begin
Result := ((P div 10) shl 4) or (P mod 10);
end;
procedure BuildAdress(LBA: Integer; var Dest);
var
P: PByte;
begin
Inc(LBA, 75 * 2); // 2 seconds
P := @Dest;
P^ := bin2bcd(LBA div (60 * 75));
Inc(P);
P^ := bin2bcd((LBA div 75) mod 60);
Inc(P);
P^ := bin2bcd(LBA mod 75);
Inc(P);
P^ := 2;
end;
function GetImageScan(const FileName: string): Boolean;
const
cSectorHeader: array [0 .. cSectorHeaderSize - 1] of byte = ($00, $FF, $FF,
$FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $00);
var
Sz: cardinal;
pFile: PBytesArray;
tmp: TFileStream;
begin
Result := False;
Sz := FileSize(FileName);
if (Sz > cMaxFileSize) or (Sz = 0) then Exit;
pFile := GetMemory(cSectorHeaderSize);
tmp := TFileStream.Create(Utf8ToSys(FileName), fmOpenRead or fmShareDenyWrite);
tmp.Read(pFile^[0], cSectorHeaderSize);
Result := ((Sz mod cSectorSize) = 0) and (CompareMem(@cSectorHeader, pFile, cSectorHeaderSize));
tmp.free;
FreeMemory(pFile);
end;
procedure ReplaceTimInFileFromMemory(const FileName: string; TIM: PTIM;
InsertTo: Integer; ImageScan: Boolean);
type
TSecAddrAndMode = array [0 .. cSectorAddressSize + cSectorModeSize - 1] of byte;
var
sImageStream: TFileStream;
TimOffsetInSector, FirstPartSize, LastPartSize: Integer;
TimSectorNumber, TimStartSectorPos: Integer;
Sector: TCDSector;
ecc: DWORD;
P, TIM_FULL_SECTORS: Integer;
SecAddrAndMode: TSecAddrAndMode;
begin
sImageStream := TFileStream.Create(UTF8ToSys(FileName), fmOpenReadWrite or fmShareDenyWrite);
if not ImageScan then
begin
sImageStream.Seek(InsertTo, soBeginning);
sImageStream.Write(TIM^.DATA^[0], TIM^.dwSIZE);
end
else
begin
P := 0;
TimSectorNumber := InsertTo div cSectorSize + 1;
TimOffsetInSector := InsertTo mod cSectorSize - cSectorInfoSize;
TimStartSectorPos := (TimSectorNumber - 1) * cSectorSize;
FirstPartSize := cSectorDataSize - TimOffsetInSector;
if TIM^.dwSIZE < FirstPartSize then
FirstPartSize := TIM^.dwSIZE;
sImageStream.Seek(TimStartSectorPos, soBeginning);
FillChar(Sector, cSectorSize, 0);
sImageStream.Read(Sector, cSectorSize);
sImageStream.Seek(Int64(TimStartSectorPos) + Int64(cSectorHeaderSize), soBeginning);
Move(Sector.dwAddress[0], SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
FillChar(Sector.dwAddress[0], cSectorAddressSize + cSectorModeSize, 0);
Move(TIM^.DATA^[P], Sector.dwData[TimOffsetInSector], FirstPartSize);
Inc(P, FirstPartSize);
ecc := build_edc(@(Sector.dwSubHeader[0]), cSectorSubHeaderSize + cSectorDataSize);
Move(ecc, Sector.dwECC, cSectorECCSize);
encode_L2_P(@(Sector.dwAddress[0]));
encode_L2_Q(@(Sector.dwAddress[0]));
BuildAdress(TimSectorNumber, Sector.dwAddress[0]);
sImageStream.Seek(TimStartSectorPos, soBeginning);
sImageStream.Write(Sector, cSectorSize);
sImageStream.Seek(Int64(TimStartSectorPos) + Int64(cSectorHeaderSize), soBeginning);
sImageStream.Write(SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
Inc(TimStartSectorPos, cSectorSize);
sImageStream.Seek(TimStartSectorPos, soBeginning);
TIM_FULL_SECTORS := (TIM^.dwSIZE - P) div cSectorDataSize;
while TIM_FULL_SECTORS > 0 do
begin
Inc(TimSectorNumber);
sImageStream.Read(Sector, cSectorSize);
Move(Sector.dwAddress[0], SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
FillChar(Sector.dwAddress[0], cSectorAddressSize + cSectorModeSize, 0);
Move(TIM^.DATA^[P], Sector.dwData[0], cSectorDataSize);
Inc(P, cSectorDataSize);
ecc := build_edc(@(Sector.dwSubHeader[0]), cSectorSubHeaderSize + cSectorDataSize);
Move(ecc, Sector.dwECC, cSectorECCSize);
encode_L2_P(@(Sector.dwAddress[0]));
encode_L2_Q(@(Sector.dwAddress[0]));
BuildAdress(TimSectorNumber, Sector.dwAddress[0]);
sImageStream.Seek(TimStartSectorPos, soBeginning);
sImageStream.Write(Sector, cSectorSize);
sImageStream.Seek(Int64(TimStartSectorPos) + Int64(cSectorHeaderSize), soBeginning);
sImageStream.Write(SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
Inc(TimStartSectorPos, cSectorSize);
sImageStream.Seek(TimStartSectorPos, soBeginning);
Dec(TIM_FULL_SECTORS);
end;
Inc(TimSectorNumber);
sImageStream.Read(Sector, cSectorSize);
Move(Sector.dwAddress[0], SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
FillChar(Sector.dwAddress[0], cSectorAddressSize + cSectorModeSize, 0);
if TIM^.dwSIZE > P then
begin
LastPartSize := TIM^.dwSIZE - P;
Move(TIM^.DATA^[P], Sector.dwData[0], LastPartSize);
ecc := build_edc(@(Sector.dwSubHeader[0]), cSectorSubHeaderSize + cSectorDataSize);
Move(ecc, Sector.dwECC, cSectorECCSize);
encode_L2_P(@(Sector.dwAddress[0]));
encode_L2_Q(@(Sector.dwAddress[0]));
BuildAdress(TimSectorNumber, Sector.dwAddress[0]);
sImageStream.Seek(TimStartSectorPos, soBeginning);
sImageStream.Write(Sector, cSectorSize);
sImageStream.Seek(Int64(TimStartSectorPos) + Int64(cSectorHeaderSize), soBeginning);
sImageStream.Write(SecAddrAndMode[0], cSectorAddressSize + cSectorModeSize);
end;
end;
sImageStream.free;
end;
function ReplaceTimInFile(const FileName, TimToInsert: string; InsertTo: Integer;
ImageScan: Boolean): Boolean;
var
SIZE, P: Integer;
TIM: PTIM;
begin
Result := False;
SIZE := FileSize(TimToInsert);
P := 0;
TIM := LoadTimFromFile(TimToInsert, P, False, SIZE);
// SaveTimToFile('test.tim', TIM);
if TIM = nil then
Exit;
ReplaceTimInFileFromMemory(FileName, TIM, InsertTo, ImageScan);
FreeTIM(TIM);
Result := True;
end;
end.