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unit DataAccess; |
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interface |
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|
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uses TypeDefs, Classes, StrUtils, SysUtils; |
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//uses Data, Classes, SysUtils, StrUtils, |
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// Dialogs, ABSDecUtil, ABSMain, DB, Windows; |
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|
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|
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type |
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TDataAccess = class |
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private |
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FConnectionID: Integer; |
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FFileName: String; |
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FBackend: TDataBackend; |
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FLevelNumber: Integer; |
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FChangeRights: TChangeRights; |
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protected |
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public |
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property ConnectionID: Integer read FConnectionID; |
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property FileName: String read FFileName; |
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property Backend: TDataBackend read FBackend; |
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property LevelNumber: Integer read FLevelNumber; |
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|
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constructor Create(FileName: String; ConnectionID: Integer; var Msg: TStatusMessages); virtual; abstract; |
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procedure Close; virtual; abstract; |
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|
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function ExtractFileIDOfName(Name: String): Integer; virtual; |
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function GetFileInfo(FileID: Integer): TFileInfo; virtual; |
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function GetFileInfoByName(Name: String): TFileInfo; virtual; |
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function GetFilesList(Ext: String; Pattern: String; |
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NoEmptyFiles: Boolean; SortType: TSortType): TStrings; virtual; abstract; |
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function GetFileCount: Integer; virtual; abstract; |
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function GetExtensionsList(ExtListFormat: TExtensionFormat): TStrings; virtual; abstract; |
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|
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procedure LoadDatFile(FileID: Integer; var Target: TStream); overload; virtual; abstract; |
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procedure LoadDatFile(FileID: Integer; var Target: TByteArray); overload; virtual; abstract; |
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procedure UpdateDatFile(FileID: Integer; Src: TStream); overload; virtual; abstract; |
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procedure UpdateDatFile(FileID: Integer; Src: TByteArray); overload; virtual; abstract; |
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procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract; |
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procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TByteArray); overload; virtual; abstract; |
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procedure LoadDatFilePart(FileID, Offset, Size: Integer; Target: Pointer); overload; virtual; abstract; |
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procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: TStream); overload; virtual; abstract; |
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procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: TByteArray); overload; virtual; abstract; |
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procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: Pointer); overload; virtual; abstract; |
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|
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function GetRawList(FileID: Integer): TRawDataList; virtual; abstract; |
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function GetRawInfo(FileID, DatOffset: Integer): TRawDataInfo; |
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|
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procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TStream); overload; virtual; abstract; |
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procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TByteArray); overload; virtual; abstract; |
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procedure UpdateRawFile(FileID, DatOffset, Size: Integer; Src: TStream); overload; virtual; abstract; |
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procedure UpdateRawFile(FileID, DatOffset, Size: Integer; Src: TByteArray); overload; virtual; abstract; |
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procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract; |
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procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TByteArray); overload; virtual; abstract; |
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procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; Target: Pointer); overload; virtual; abstract; |
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procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: TStream); overload; virtual; abstract; |
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procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: TByteArray); overload; virtual; abstract; |
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procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: Pointer); overload; virtual; abstract; |
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|
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function AppendRawFile(LocSep: Boolean; Size: Integer; Src: TStream): Integer; overload; virtual; abstract; |
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function AppendRawFile(LocSep: Boolean; Size: Integer; Src: TByteArray): Integer; overload; virtual; abstract; |
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function AppendRawFile(LocSep: Boolean; Size: Integer; Src: Pointer): Integer; overload; virtual; abstract; |
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published |
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end; |
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|
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{ |
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var |
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DataConnections: array of TOniData; |
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|
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function CreateDataConnection(filename: String; backend: Integer): TOniData; |
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function ConnectionExists(filename: String): TOniData; |
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procedure CloseDataConnection(connection: TOniData); |
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function GetEmptyFileInfo: TFileInfo; |
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} |
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|
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|
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implementation |
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|
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|
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(* |
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Implementation of TDataAccess |
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*) |
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|
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function TDataAccess.ExtractFileIDOfName(Name: String): Integer; |
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begin |
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if Name[5] = '-' then |
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Result := StrToInt(MidStr(Name, 1, 4)) |
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else |
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Result := StrToInt(MidStr(Name, 1, 5)); |
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end; |
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|
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|
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function TDataAccess.GetFileInfo(FileID: Integer): TFileInfo; |
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begin |
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Result.ID := -1; |
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Result.Name := ''; |
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Result.Extension := ''; |
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Result.Size := -1; |
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Result.FileType := 0; |
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Result.DatAddr := -1; |
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end; |
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|
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|
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function TDataAccess.GetFileInfoByName(Name: String): TFileInfo; |
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var |
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i: Integer; |
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files: TStrings; |
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begin |
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Result := GetFileInfo(-1); |
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files := GetFilesList('', Name, False, ST_IDAsc); |
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if files.Count = 0 then |
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else |
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begin |
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for i := 0 to files.Count - 1 do |
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begin |
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if MidStr(files.Strings[i], Pos('-', files.Strings[i]) + 1, |
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Length(files.Strings[i]) - Pos('-', files.Strings[i]) - 5) = name then |
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begin |
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Result := GetFileInfo(ExtractFileIDOfName(files.Strings[i])); |
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Break; |
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end; |
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end; |
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end; |
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files.Free; |
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end; |
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|
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|
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function TDataAccess.GetRawInfo(FileID, DatOffset: Integer): TRawDataInfo; |
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var |
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i: LongWord; |
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RawList: TRawDataList; |
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begin |
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RawList := GetRawList(FileID); |
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Result.SrcID := -1; |
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Result.SrcOffset := -1; |
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Result.RawAddr := -1; |
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Result.RawSize := -1; |
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if Length(RawList) > 0 then |
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begin |
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for i := 0 to High(RawList) do |
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begin |
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if RawList[i].SrcOffset = DatOffset then |
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begin |
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Result.SrcID := FileID; |
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Result.SrcOffset := RawList[i].SrcOffset; |
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Result.RawAddr := RawList[i].RawAddr; |
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Result.RawSize := RawList[i].RawSize; |
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Result.LocSep := RawList[i].LocSep; |
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Break; |
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end; |
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end; |
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end; |
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end; |
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|
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end. |
