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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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{$IFDEF FPC}
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{$mode objfpc}{$H+}
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{$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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type
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{ TFBBlobMetaData }
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TFBBlobMetaData = class(TActivityReporter)
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private
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FRelationName: string;
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FColumnName: string;
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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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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: string
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);
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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: string;
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function GetColumnName: string;
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function GetUnconfirmedCharacterSet: boolean;
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end;
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TFBBlob = class(TActivityReporter)
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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 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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procedure TransactionEnding(aTransaction: TFBTransaction; 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: string;
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function GetColumnName: string;
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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); virtual; abstract;
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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: string): IBlob;
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function LoadFromStream(S: TStream) : IBlob;
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function SaveToFile(Filename: string): IBlob;
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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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uses FBMessages;
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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: TFBTransaction;
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Force: boolean);
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begin
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if aTransaction <> FTransaction 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: string;
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begin
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Result := FMetaData.GetRelationName;
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end;
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function TFBBlob.GetColumnName: string;
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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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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: string): 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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const BufSize = 8 * 1024;
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function TFBBlob.LoadFromStream(S: TStream): IBlob;
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var Buffer: array [0..BufSize-1] of char;
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BytesRead: integer;
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begin
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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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function TFBBlob.SaveToFile(Filename: string): 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, 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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function TFBBlob.SaveToStream(S: TStream): IBlob;
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var Buffer: array [0..BufSize-1] of char;
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BytesRead: integer;
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begin
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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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function TFBBlob.GetAsString: rawbytestring;
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var ss: TStringStream;
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begin
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if FStringCached then
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begin
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Result := FStringData;
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Exit;
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end;
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ss := TStringStream.Create('');
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try
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SaveToStream(ss);
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Result := ss.DataString;
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if (GetSubType = 1) and (FBPB = nil) then
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SetCodePage(Result,GetCodePage,false);
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finally
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ss.Free;
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end;
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FStringData := Result;
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FStringCached := true;
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end;
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procedure TFBBlob.SetAsString(aValue: rawbytestring);
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var
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ss: TStringStream;
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begin
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{if GetUnconfirmedCharacterSet then
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IBError(ibxeNoDefaultCharacterSet,[nil]);}
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if (GetSubType = 1) and (StringCodePage(aValue) <> GetCodePage) and
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(GetCodePage <> CP_NONE) and (FBPB = nil) then
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SetCodePage(aValue,GetCodePage,true);
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ss := TStringStream.Create(aValue);
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try
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LoadFromStream(ss);
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finally
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ss.Free;
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end;
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FStringData := aValue;
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FStringCached := true;
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end;
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function TFBBlob.SetString(aValue: rawbytestring): IBlob;
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begin
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SetAsString(aValue);
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Result := GetIntf;
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end;
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{TFBBlobMetaData}
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procedure TFBBlobMetaData.NeedSubType;
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begin
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if not FHasSubType then
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begin
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NeedFullMetadata;
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FHasSubType := true;
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end;
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end;
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constructor TFBBlobMetaData.Create(Transaction: TFBTransaction; RelationName,
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ColumnName: string);
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begin
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inherited Create(Transaction);
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// if (RelationName = '') or (ColumnName = '') then
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// IBError(ibxeMissingColumnName,[]);
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FRelationName := RelationName;
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FColumnName := ColumnName;
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FSegmentSize := 80;
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end;
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function TFBBlobMetaData.GetSubType: integer;
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begin
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NeedSubType;
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Result := FSubType;
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end;
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function TFBBlobMetaData.GetCharSetID: cardinal;
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begin
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NeedFullMetadata;
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Result := FCharSetID;
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end;
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function TFBBlobMetaData.GetCodePage: TSystemCodePage;
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begin
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FirebirdClientAPI.CharSetID2CodePage(GetCharSetID,Result);
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end;
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function TFBBlobMetaData.GetSegmentSize: cardinal;
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begin
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NeedFullMetadata;
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Result := FSegmentSize;
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end;
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function TFBBlobMetaData.GetRelationName: string;
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begin
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Result := FRelationName;
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end;
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function TFBBlobMetaData.GetColumnName: string;
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begin
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Result := FColumnName;
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end;
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function TFBBlobMetaData.GetUnconfirmedCharacterSet: boolean;
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begin
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NeedFullMetadata;
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Result := FUnconfirmedCharacterSet;
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end;
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end.
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|