CEF4Delphi/source/uCEFStreamReader.pas

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
//         https://www.briskbard.com/index.php?lang=en&pageid=cef
//
//        Copyright © 2017 Salvador Díaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
 *                       Delphi Chromium Embedded 3
 *
 * Usage allowed under the restrictions of the Lesser GNU General Public License
 * or alternatively the restrictions of the Mozilla Public License 1.1
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * Unit owner : Henri Gourvest <hgourvest@gmail.com>
 * Web site   : http://www.progdigy.com
 * Repository : http://code.google.com/p/delphichromiumembedded/
 * Group      : http://groups.google.com/group/delphichromiumembedded
 *
 * Embarcadero Technologies, Inc is not permitted to use or redistribute
 * this source code without explicit permission.
 *
 *)

unit uCEFStreamReader;

{$IFNDEF CPUX64}
  {$ALIGN ON}
  {$MINENUMSIZE 4}
{$ENDIF}

{$I cef.inc}

interface

uses
  {$IFDEF DELPHI16_UP}
  System.Classes,
  {$ELSE}
  Classes,
  {$ENDIF}
  uCEFBase, uCEFInterfaces, uCEFTypes;

type
  TCefStreamReaderRef = class(TCefBaseRef, ICefStreamReader)
  protected
    function Read(ptr: Pointer; size, n: NativeUInt): NativeUInt;
    function Seek(offset: Int64; whence: Integer): Integer;
    function Tell: Int64;
    function Eof: Boolean;
    function MayBlock: Boolean;
  public
    class function UnWrap(data: Pointer): ICefStreamReader;
    class function CreateForFile(const filename: ustring): ICefStreamReader;
    class function CreateForCustomStream(const stream: ICefCustomStreamReader): ICefStreamReader;
    class function CreateForStream(const stream: TSTream; owned: Boolean): ICefStreamReader;
    class function CreateForData(data: Pointer; size: NativeUInt): ICefStreamReader;
  end;

implementation

uses
  uCEFMiscFunctions, uCEFLibFunctions, uCEFCustomStreamReader;

class function TCefStreamReaderRef.CreateForCustomStream(
  const stream: ICefCustomStreamReader): ICefStreamReader;
begin
  Result := UnWrap(cef_stream_reader_create_for_handler(CefGetData(stream)))
end;

class function TCefStreamReaderRef.CreateForData(data: Pointer; size: NativeUInt): ICefStreamReader;
begin
  Result := UnWrap(cef_stream_reader_create_for_data(data, size))
end;

class function TCefStreamReaderRef.CreateForFile(const filename: ustring): ICefStreamReader;
var
  f: TCefString;
begin
  f := CefString(filename);
  Result := UnWrap(cef_stream_reader_create_for_file(@f))
end;

class function TCefStreamReaderRef.CreateForStream(const stream: TSTream;
  owned: Boolean): ICefStreamReader;
begin
  Result := CreateForCustomStream(TCefCustomStreamReader.Create(stream, owned) as ICefCustomStreamReader);
end;

function TCefStreamReaderRef.Eof: Boolean;
begin
  Result := PCefStreamReader(FData)^.eof(PCefStreamReader(FData)) <> 0;
end;

function TCefStreamReaderRef.MayBlock: Boolean;
begin
  Result := PCefStreamReader(FData)^.may_block(FData) <> 0;
end;

function TCefStreamReaderRef.Read(ptr: Pointer; size, n: NativeUInt): NativeUInt;
begin
  Result := PCefStreamReader(FData)^.read(PCefStreamReader(FData), ptr, size, n);
end;

function TCefStreamReaderRef.Seek(offset: Int64; whence: Integer): Integer;
begin
  Result := PCefStreamReader(FData)^.seek(PCefStreamReader(FData), offset, whence);
end;

function TCefStreamReaderRef.Tell: Int64;
begin
  Result := PCefStreamReader(FData)^.tell(PCefStreamReader(FData));
end;

class function TCefStreamReaderRef.UnWrap(data: Pointer): ICefStreamReader;
begin
  if data <> nil then
    Result := Create(data) as ICefStreamReader else
    Result := nil;
end;

end.