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(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2016 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit FBBlob;
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tony |
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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tony |
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{$IFDEF FPC}
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tony |
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{$mode delphi}
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tony |
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBActivityMonitor, FBTransaction, FBClientAPI,
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FBOutputBlock;
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tony |
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type
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{ TFBBlobMetaData }
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TFBBlobMetaData = class(TActivityReporter)
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private
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tony |
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FRelationName: AnsiString;
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FColumnName: AnsiString;
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tony |
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protected
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FUnconfirmedCharacterSet: boolean;
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FHasSubType: boolean;
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FSubType: integer;
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FCharSetID: cardinal;
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FSegmentSize: cardinal;
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tony |
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function Attachment: IAttachment; virtual; abstract;
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tony |
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function CanFetchMetaData: boolean;
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tony |
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procedure NeedFullMetadata; virtual; abstract;
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procedure NeedSubType;
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public
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constructor Create(Transaction: TFBTransaction; RelationName, ColumnName: AnsiString
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);
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procedure SetCharSetID(aValue: integer);
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tony |
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public
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{IBlobMetaData}
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function GetSubType: integer;
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function GetCharSetID: cardinal;
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function GetCodePage: TSystemCodePage;
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function GetSegmentSize: cardinal;
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function GetRelationName: AnsiString;
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function GetColumnName: AnsiString;
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function GetUnconfirmedCharacterSet: boolean;
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end;
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TFBBlob = class(TActivityReporter,ITransactionUser)
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private
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FMetaData: IBlobMetaData;
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FAttachment: IAttachment;
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FTransaction: ITransaction;
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FBPB: IBPB;
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FStringData: rawbytestring;
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FStringCached: boolean;
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protected
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FCreating: boolean;
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FBlobID: TISC_QUAD;
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procedure CheckReadable; virtual; abstract;
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procedure CheckWritable; virtual; abstract;
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procedure ClearStringCache;
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function GetIntf: IBlob; virtual; abstract;
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procedure GetInfo(Request: array of byte; Response: IBlobInfo); overload; virtual; abstract;
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procedure InternalClose(Force: boolean); virtual; abstract;
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procedure InternalCancel(Force: boolean); virtual; abstract;
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public
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constructor Create(Attachment: IAttachment; Transaction: TFBTransaction;
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MetaData: IBlobMetaData; BPB: IBPB); overload;
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constructor Create(Attachment: IAttachment; Transaction: TFBTransaction;
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MetaData: IBlobMetaData; BlobID: TISC_QUAD; BPB: IBPB); overload;
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destructor Destroy; override;
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public
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{ITransactionUser}
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procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
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public
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{IBlobMetaData}
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function GetSubType: integer;
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function GetCharSetID: cardinal;
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function GetCodePage: TSystemCodePage;
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function GetSegmentSize: cardinal;
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function GetRelationName: AnsiString;
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function GetColumnName: AnsiString;
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function GetUnconfirmedCharacterSet: boolean;
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{IBlob}
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function GetBPB: IBPB;
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procedure Cancel;
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procedure Close;
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function GetBlobSize: Int64;
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procedure GetInfo(var NumSegments: Int64; var MaxSegmentSize, TotalSize: Int64;
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var BlobType: TBlobType); overload;
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function GetBlobID: TISC_QUAD;
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function GetBlobMode: TFBBlobMode;
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function Read(var Buffer; Count: Longint): Longint; virtual; abstract;
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function Write(const Buffer; Count: Longint): Longint; virtual; abstract;
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function LoadFromFile(Filename: AnsiString): IBlob;
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function LoadFromStream(S: TStream) : IBlob;
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function SaveToFile(Filename: AnsiString): IBlob;
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tony |
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function SaveToStream(S: TStream): IBlob;
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function GetAttachment: IAttachment;
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function GetTransaction: ITransaction;
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function GetAsString: rawbytestring;
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procedure SetAsString(aValue: rawbytestring);
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function SetString(aValue: rawbytestring): IBlob;
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end;
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implementation
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{ TFBBlob }
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procedure TFBBlob.ClearStringCache;
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begin
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FStringData := '';
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FStringCached := false;
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end;
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constructor TFBBlob.Create(Attachment: IAttachment;
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Transaction: TFBTransaction; MetaData: IBlobMetaData; BPB: IBPB);
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begin
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inherited Create(Transaction);
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FAttachment := Attachment;
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FTransaction := Transaction;
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FMetaData := MetaData;
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FBPB := BPB;
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FCreating := true;
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end;
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constructor TFBBlob.Create(Attachment: IAttachment;
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Transaction: TFBTransaction; MetaData: IBlobMetaData; BlobID: TISC_QUAD; BPB: IBPB);
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begin
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Create(Attachment,Transaction,MetaData,BPB);
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FBlobID := BlobID;
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FCreating := false;
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end;
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destructor TFBBlob.Destroy;
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begin
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if FCreating then
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Cancel
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else
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Close;
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inherited Destroy;
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end;
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procedure TFBBlob.TransactionEnding(aTransaction: ITransaction; Force: boolean);
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begin
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if (aTransaction as TObject) <> (FTransaction as TObject) then
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Exit;
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if FCreating then
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InternalCancel(Force)
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else
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InternalClose(Force);
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end;
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function TFBBlob.GetSubType: integer;
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begin
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Result := FMetaData.GetSubType;
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end;
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function TFBBlob.GetCharSetID: cardinal;
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begin
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Result := FMetaData.GetCharSetID;
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end;
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function TFBBlob.GetCodePage: TSystemCodePage;
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begin
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Result := FMetaData.GetCodePage;
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end;
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function TFBBlob.GetSegmentSize: cardinal;
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begin
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Result := FMetaData.GetSegmentSize;
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end;
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function TFBBlob.GetRelationName: AnsiString;
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begin
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Result := FMetaData.GetRelationName;
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end;
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function TFBBlob.GetColumnName: AnsiString;
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begin
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Result := FMetaData.GetColumnName;
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end;
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function TFBBlob.GetUnconfirmedCharacterSet: boolean;
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begin
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Result := (FMetadata as TFBBlobMetadata).GetUnconfirmedCharacterSet;
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end;
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function TFBBlob.GetBPB: IBPB;
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begin
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Result := FBPB;
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end;
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procedure TFBBlob.Cancel;
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begin
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InternalCancel(false);
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end;
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procedure TFBBlob.Close;
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begin
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InternalClose(false);
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end;
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function TFBBlob.GetBlobSize: Int64;
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var NumSegments: Int64;
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MaxSegmentSize: Int64;
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BlobType: TBlobType;
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begin
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GetInfo(NumSegments,MaxSegmentSize,Result,BlobType);
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end;
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procedure TFBBlob.GetInfo(var NumSegments: Int64; var MaxSegmentSize,
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TotalSize: Int64; var BlobType: TBlobType);
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var BlobInfo: IBlobInfo;
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i: integer;
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begin
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NumSegments := 0;
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MaxSegmentSize := 0;
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TotalSize := 0;
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BlobType := btSegmented;
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BlobInfo := TBlobInfo.Create(FAttachment.getFirebirdAPI as TFBClientAPI);
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GetInfo([isc_info_blob_num_segments,
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isc_info_blob_max_segment,
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isc_info_blob_total_length,
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isc_info_blob_type],BlobInfo);
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for i := 0 to BlobInfo.Count - 1 do
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with BlobInfo[i] do
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case getItemType of
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isc_info_blob_num_segments:
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NumSegments := GetAsInteger;
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isc_info_blob_max_segment:
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MaxSegmentSize := GetAsInteger;
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isc_info_blob_total_length:
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TotalSize := GetAsInteger;
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isc_info_blob_type:
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if GetAsInteger = 0 then
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BlobType := btSegmented
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else
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BlobType := btStream;
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end;
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end;
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function TFBBlob.GetBlobID: TISC_QUAD;
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begin
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Result := FBlobID;
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end;
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function TFBBlob.GetBlobMode: TFBBlobMode;
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begin
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if FCreating then
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Result := fbmWrite
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else
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Result := fbmRead;
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end;
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function TFBBlob.LoadFromFile(Filename: AnsiString): IBlob;
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var
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Stream: TStream;
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begin
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Stream := TFileStream.Create(FileName, fmOpenRead);
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try
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Result := LoadFromStream(Stream);
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finally
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Stream.Free;
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end;
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end;
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307 |
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const BufSize = 8 * 1024;
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function TFBBlob.LoadFromStream(S: TStream): IBlob;
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310 |
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var Buffer: array [0..BufSize-1] of char;
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BytesRead: integer;
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312 |
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begin
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313 |
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CheckWritable;
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S.Position := 0;
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repeat
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BytesRead := S.Read(Buffer,BufSize);
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Write(Buffer,BytesRead);
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until BytesRead = 0;
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Close;
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Result := GetIntf;
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end;
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tony |
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function TFBBlob.SaveToFile(Filename: AnsiString): IBlob;
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324 |
tony |
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var
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Stream: TStream;
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begin
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Stream := TFileStream.Create(FileName, fmCreate);
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try
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Result := SaveToStream(Stream);
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finally
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Stream.Free;
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end;
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end;
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334 |
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335 |
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function TFBBlob.SaveToStream(S: TStream): IBlob;
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336 |
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var Buffer: array [0..BufSize-1] of char;
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337 |
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BytesRead: integer;
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338 |
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begin
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339 |
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CheckReadable;
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repeat
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BytesRead := Read(Buffer,BufSize);
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S.Write(Buffer,BytesRead);
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until BytesRead = 0;
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Close;
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Result := GetIntf;
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end;
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function TFBBlob.GetAttachment: IAttachment;
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begin
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Result := FAttachment;
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end;
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function TFBBlob.GetTransaction: ITransaction;
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begin
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Result := FTransaction;
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end;
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357 |
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358 |
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function TFBBlob.GetAsString: rawbytestring;
|
359 |
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var ss: TStringStream;
|
360 |
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begin
|
361 |
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if FStringCached then
|
362 |
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begin
|
363 |
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Result := FStringData;
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364 |
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Exit;
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365 |
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end;
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366 |
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367 |
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ss := TStringStream.Create('');
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368 |
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try
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SaveToStream(ss);
|
370 |
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Result := ss.DataString;
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371 |
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if (GetSubType = 1) and (FBPB = nil) then
|
372 |
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SetCodePage(Result,GetCodePage,false);
|
373 |
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finally
|
374 |
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ss.Free;
|
375 |
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end;
|
376 |
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FStringData := Result;
|
377 |
|
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FStringCached := true;
|
378 |
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end;
|
379 |
|
|
|
380 |
|
|
procedure TFBBlob.SetAsString(aValue: rawbytestring);
|
381 |
|
|
var
|
382 |
|
|
ss: TStringStream;
|
383 |
|
|
begin
|
384 |
|
|
{if GetUnconfirmedCharacterSet then
|
385 |
|
|
IBError(ibxeNoDefaultCharacterSet,[nil]);}
|
386 |
|
|
|
387 |
|
|
if (GetSubType = 1) and (StringCodePage(aValue) <> GetCodePage) and
|
388 |
|
|
(GetCodePage <> CP_NONE) and (FBPB = nil) then
|
389 |
|
|
SetCodePage(aValue,GetCodePage,true);
|
390 |
|
|
ss := TStringStream.Create(aValue);
|
391 |
|
|
try
|
392 |
|
|
LoadFromStream(ss);
|
393 |
|
|
finally
|
394 |
|
|
ss.Free;
|
395 |
|
|
end;
|
396 |
|
|
FStringData := aValue;
|
397 |
|
|
FStringCached := true;
|
398 |
|
|
end;
|
399 |
|
|
|
400 |
|
|
function TFBBlob.SetString(aValue: rawbytestring): IBlob;
|
401 |
|
|
begin
|
402 |
|
|
SetAsString(aValue);
|
403 |
|
|
Result := GetIntf;
|
404 |
|
|
end;
|
405 |
|
|
|
406 |
|
|
{TFBBlobMetaData}
|
407 |
|
|
|
408 |
tony |
109 |
function TFBBlobMetaData.CanFetchMetaData: boolean;
|
409 |
|
|
begin
|
410 |
|
|
Result := (FRelationName <> '') and (FColumnName <> '');
|
411 |
|
|
end;
|
412 |
|
|
|
413 |
tony |
45 |
procedure TFBBlobMetaData.NeedSubType;
|
414 |
|
|
begin
|
415 |
|
|
if not FHasSubType then
|
416 |
|
|
begin
|
417 |
|
|
NeedFullMetadata;
|
418 |
|
|
FHasSubType := true;
|
419 |
|
|
end;
|
420 |
|
|
end;
|
421 |
|
|
|
422 |
|
|
constructor TFBBlobMetaData.Create(Transaction: TFBTransaction; RelationName,
|
423 |
tony |
56 |
ColumnName: AnsiString);
|
424 |
tony |
45 |
begin
|
425 |
|
|
inherited Create(Transaction);
|
426 |
|
|
// if (RelationName = '') or (ColumnName = '') then
|
427 |
|
|
// IBError(ibxeMissingColumnName,[]);
|
428 |
|
|
FRelationName := RelationName;
|
429 |
|
|
FColumnName := ColumnName;
|
430 |
|
|
FSegmentSize := 80;
|
431 |
tony |
47 |
FUnconfirmedCharacterSet := true;
|
432 |
|
|
FCharSetID := 0;
|
433 |
tony |
45 |
end;
|
434 |
|
|
|
435 |
tony |
47 |
procedure TFBBlobMetaData.SetCharSetID(aValue: integer);
|
436 |
|
|
begin
|
437 |
|
|
FCharSetID := aValue;
|
438 |
|
|
FUnconfirmedCharacterSet := false;
|
439 |
|
|
end;
|
440 |
|
|
|
441 |
tony |
45 |
function TFBBlobMetaData.GetSubType: integer;
|
442 |
|
|
begin
|
443 |
|
|
NeedSubType;
|
444 |
|
|
Result := FSubType;
|
445 |
|
|
end;
|
446 |
|
|
|
447 |
|
|
function TFBBlobMetaData.GetCharSetID: cardinal;
|
448 |
|
|
begin
|
449 |
tony |
110 |
if FUnconfirmedCharacterSet and CanFetchMetaData then
|
450 |
tony |
109 |
NeedFullMetadata;
|
451 |
tony |
110 |
Result := FCharSetID;
|
452 |
tony |
45 |
end;
|
453 |
|
|
|
454 |
|
|
function TFBBlobMetaData.GetCodePage: TSystemCodePage;
|
455 |
|
|
begin
|
456 |
tony |
60 |
Attachment.CharSetID2CodePage(GetCharSetID,Result);
|
457 |
tony |
45 |
end;
|
458 |
|
|
|
459 |
|
|
function TFBBlobMetaData.GetSegmentSize: cardinal;
|
460 |
|
|
begin
|
461 |
|
|
NeedFullMetadata;
|
462 |
|
|
Result := FSegmentSize;
|
463 |
|
|
end;
|
464 |
|
|
|
465 |
tony |
56 |
function TFBBlobMetaData.GetRelationName: AnsiString;
|
466 |
tony |
45 |
begin
|
467 |
|
|
Result := FRelationName;
|
468 |
|
|
end;
|
469 |
|
|
|
470 |
tony |
56 |
function TFBBlobMetaData.GetColumnName: AnsiString;
|
471 |
tony |
45 |
begin
|
472 |
|
|
Result := FColumnName;
|
473 |
|
|
end;
|
474 |
|
|
|
475 |
|
|
function TFBBlobMetaData.GetUnconfirmedCharacterSet: boolean;
|
476 |
|
|
begin
|
477 |
|
|
NeedFullMetadata;
|
478 |
|
|
Result := FUnconfirmedCharacterSet;
|
479 |
|
|
end;
|
480 |
|
|
|
481 |
|
|
|
482 |
|
|
end.
|
483 |
|
|
|