mirror of
https://github.com/salvadordf/CEF4Delphi.git
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358 lines
9.0 KiB
ObjectPascal
358 lines
9.0 KiB
ObjectPascal
// ************************************************************************
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// ***************************** CEF4Delphi *******************************
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// ************************************************************************
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//
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// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
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// browser in Delphi applications.
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//
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// The original license of DCEF3 still applies to CEF4Delphi.
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//
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// For more information about CEF4Delphi visit :
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// https://www.briskbard.com/index.php?lang=en&pageid=cef
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//
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// Copyright © 2018 Salvador Diaz Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uCEFWriteHandler;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$IFNDEF CPUX64}
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{$ALIGN ON}
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{$MINENUMSIZE 4}
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{$ENDIF}
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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{$IFDEF MSWINDOWS}WinApi.Windows,{$ENDIF}
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{$ELSE}
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Windows,
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{$ENDIF}
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uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes;
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type
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TCefWriteHandlerOwn = class(TCefBaseRefCountedOwn, ICefWriteHandler)
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protected
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function Write(const ptr: Pointer; size, n: NativeUInt): NativeUInt; virtual;
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function Seek(offset: Int64; whence: Integer): Integer; virtual;
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function Tell: Int64; virtual;
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function Flush: Integer; virtual;
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function MayBlock: Boolean; virtual;
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public
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constructor Create; virtual;
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end;
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TCefBytesWriteHandler = class(TCefWriteHandlerOwn)
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protected
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FCriticalSection : TRTLCriticalSection;
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FGrow : NativeUInt;
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FBuffer : Pointer;
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FBufferSize : int64;
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FOffset : int64;
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function Grow(size : NativeUInt) : NativeUInt;
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public
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constructor Create(aGrow : NativeUInt); reintroduce;
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destructor Destroy; override;
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function Write(const ptr: Pointer; size, n: NativeUInt): NativeUInt; override;
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function Seek(offset: Int64; whence: Integer): Integer; override;
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function Tell: Int64; override;
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function Flush: Integer; override;
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function MayBlock: Boolean; override;
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function GetData : pointer;
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function GetDataSize : int64;
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end;
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implementation
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uses
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uCEFMiscFunctions, uCEFLibFunctions;
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// *******************************************
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// *********** TCefWriteHandlerOwn ***********
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// *******************************************
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function cef_write_handler_write( self : PCefWriteHandler;
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const ptr : Pointer;
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size : NativeUInt;
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n : NativeUInt): NativeUInt; stdcall;
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var
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TempObject : TObject;
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begin
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Result := 0;
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TempObject := CefGetObject(self);
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if (TempObject <> nil) and (TempObject is TCefWriteHandlerOwn) then
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Result:= TCefWriteHandlerOwn(TempObject).Write(ptr,
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size,
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n);
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end;
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function cef_write_handler_seek(self : PCefWriteHandler;
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offset : Int64;
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whence : Integer): Integer; stdcall;
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var
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TempObject : TObject;
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begin
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Result := 0;
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TempObject := CefGetObject(self);
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if (TempObject <> nil) and (TempObject is TCefWriteHandlerOwn) then
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Result:= TCefWriteHandlerOwn(TempObject).Seek(offset,
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whence);
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end;
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function cef_write_handler_tell(self: PCefWriteHandler): Int64; stdcall;
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var
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TempObject : TObject;
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begin
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Result := 0;
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TempObject := CefGetObject(self);
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if (TempObject <> nil) and (TempObject is TCefWriteHandlerOwn) then
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Result:= TCefWriteHandlerOwn(TempObject).Tell;
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end;
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function cef_write_handler_flush(self: PCefWriteHandler): Integer; stdcall;
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var
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TempObject : TObject;
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begin
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Result := 0;
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TempObject := CefGetObject(self);
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if (TempObject <> nil) and (TempObject is TCefWriteHandlerOwn) then
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Result:= TCefWriteHandlerOwn(TempObject).Flush;
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end;
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function cef_write_handler_may_block(self: PCefWriteHandler): Integer; stdcall;
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var
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TempObject : TObject;
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begin
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Result := Ord(False);
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TempObject := CefGetObject(self);
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if (TempObject <> nil) and (TempObject is TCefWriteHandlerOwn) then
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Result := Ord(TCefWriteHandlerOwn(TempObject).MayBlock);
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end;
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constructor TCefWriteHandlerOwn.Create;
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begin
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inherited CreateData(SizeOf(TCefWriteHandler));
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with PCefWriteHandler(FData)^ do
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begin
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write := {$IFDEF FPC}@{$ENDIF}cef_write_handler_write;
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seek := {$IFDEF FPC}@{$ENDIF}cef_write_handler_seek;
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tell := {$IFDEF FPC}@{$ENDIF}cef_write_handler_tell;
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flush := {$IFDEF FPC}@{$ENDIF}cef_write_handler_flush;
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may_block := {$IFDEF FPC}@{$ENDIF}cef_write_handler_may_block;
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end;
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end;
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function TCefWriteHandlerOwn.Flush: Integer;
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begin
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Result := 0;
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end;
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function TCefWriteHandlerOwn.MayBlock: Boolean;
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begin
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Result := False;
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end;
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function TCefWriteHandlerOwn.Seek(offset: Int64; whence: Integer): Integer;
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begin
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Result := 0;
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end;
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function TCefWriteHandlerOwn.Tell: Int64;
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begin
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Result := 0;
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end;
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function TCefWriteHandlerOwn.Write(const ptr: Pointer; size, n: NativeUInt): NativeUInt;
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begin
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Result := 0;
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end;
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// *******************************************
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// ********** TCefBytesWriteHandler **********
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// *******************************************
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constructor TCefBytesWriteHandler.Create(aGrow : NativeUInt);
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begin
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inherited Create;
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InitializeCriticalSection(FCriticalSection);
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FGrow := aGrow;
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FBufferSize := aGrow;
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FOffset := 0;
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GetMem(FBuffer, aGrow);
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end;
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destructor TCefBytesWriteHandler.Destroy;
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begin
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if (FBuffer <> nil) then FreeMem(FBuffer);
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DeleteCriticalSection(FCriticalSection);
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FCriticalSection.DebugInfo := nil;
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FCriticalSection.LockCount := 0;
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FCriticalSection.RecursionCount := 0;
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FCriticalSection.OwningThread := 0;
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FCriticalSection.LockSemaphore := 0;
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{$IFNDEF FPC}
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FCriticalSection.Reserved := 0;
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{$ENDIF}
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inherited Destroy;
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end;
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function TCefBytesWriteHandler.Write(const ptr: Pointer; size, n: NativeUInt): NativeUInt;
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var
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TempPointer : pointer;
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begin
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EnterCriticalSection(FCriticalSection);
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if ((FOffset + (size * n)) >= FBufferSize) and (Grow(size * n) = 0) then
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Result := 0
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else
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begin
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TempPointer := Pointer(cardinal(FBuffer) + FOffset);
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CopyMemory(TempPointer, ptr, size * n);
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FOffset := FOffset + (size * n);
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Result := n;
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end;
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LeaveCriticalSection(FCriticalSection);
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end;
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function TCefBytesWriteHandler.Seek(offset: Int64; whence: Integer): Integer;
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const
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SEEK_SET = 0;
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SEEK_CUR = 1;
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SEEK_END = 2;
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var
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TempAbsOffset : int64;
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begin
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EnterCriticalSection(FCriticalSection);
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Result := -1;
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case whence of
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SEEK_CUR :
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if not((FOffset + offset > FBufferSize) or (FOffset + offset < 0)) then
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begin
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FOffset := FOffset + offset;
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Result := 0;
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end;
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SEEK_END:
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begin
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TempAbsOffset := abs(offset);
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if not(TempAbsOffset > FBufferSize) then
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begin
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FOffset := FBufferSize - TempAbsOffset;
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Result := 0;
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end;
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end;
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SEEK_SET:
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if not((offset > FBufferSize) or (offset < 0)) then
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begin
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FOffset := offset;
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Result := 0;
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end;
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end;
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LeaveCriticalSection(FCriticalSection);
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end;
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function TCefBytesWriteHandler.Tell: Int64;
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begin
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EnterCriticalSection(FCriticalSection);
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Result := FOffset;
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LeaveCriticalSection(FCriticalSection);
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end;
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function TCefBytesWriteHandler.Flush: Integer;
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begin
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Result := 0;
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end;
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function TCefBytesWriteHandler.MayBlock: Boolean;
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begin
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Result := False;
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end;
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function TCefBytesWriteHandler.GetData : pointer;
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begin
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Result := FBuffer;
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end;
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function TCefBytesWriteHandler.GetDataSize : int64;
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begin
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Result := FBufferSize;
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end;
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function TCefBytesWriteHandler.Grow(size : NativeUInt) : NativeUInt;
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var
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s : NativeUInt;
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begin
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EnterCriticalSection(FCriticalSection);
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if (size > FGrow) then
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s := size
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else
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s := FGrow;
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ReallocMem(FBuffer, FBufferSize + s);
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FBufferSize := FBufferSize + s;
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Result := FBufferSize;
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LeaveCriticalSection(FCriticalSection);
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end;
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end.
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