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{
This file is part of the Free Pascal run time library.
Copyright (c) 2008 by Giulio Bernardi
Resource reader for DFM files
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit dfmreader;
{$MODE OBJFPC} {$H+}
interface
uses
Classes, SysUtils, resource;
type
{ TDfmResourceReader }
TDfmResourceReader = class (TAbstractResourceReader)
private
fExtensions : string;
fDescription : string;
fLine : string;
fLinePos : integer;
fObjectName : string;
dummyType : TResourceDesc;
dummyName : TResourceDesc;
fIsBinary : boolean;
function IsAlpha : boolean;
function IsNum : boolean;
function IsAlphaNum : boolean;
function IsSpace : boolean;
procedure SkipSpaces;
function GetIdent : string;
procedure ReadLine(aStream : TStream);
function CheckTextDfm(aStream : TStream) : boolean;
function CheckBinDfm(aStream : TStream) : boolean;
protected
function GetExtensions : string; override;
function GetDescription : string; override;
procedure Load(aResources : TResources; aStream : TStream); override;
function CheckMagic(aStream : TStream) : boolean; override;
public
constructor Create; override;
destructor Destroy; override;
end;
implementation
uses
resdatastream, resfactory;
type
TSignature = array[0..3] of char;
const
FilerSignature = 'TPF0';
{ TDfmResourceReader }
function TDfmResourceReader.IsAlpha: boolean;
begin
Result:=pchar(fLine)[fLinePos] in ['_','A'..'Z','a'..'z'];
end;
function TDfmResourceReader.IsNum: boolean;
begin
Result:=pchar(fLine)[fLinePos] in ['0'..'9'];
end;
function TDfmResourceReader.IsAlphaNum: boolean;
begin
Result:=IsAlpha or IsNum;
end;
function TDfmResourceReader.IsSpace: boolean;
const TAB = #9;
begin
Result:=pchar(fLine)[fLinePos] in [' ',TAB];
end;
procedure TDfmResourceReader.SkipSpaces;
begin
while IsSpace do inc(fLinePos);
end;
function TDfmResourceReader.GetIdent: string;
begin
Result:='';
SkipSpaces;
if not IsAlpha then exit;
while IsAlphaNum do
begin
Result:=Result+pchar(fLine)[fLinePos];
inc(fLinePos);
end;
end;
procedure TDfmResourceReader.ReadLine(aStream : TStream);
const CR = #13;
LF = #10;
var c : char;
begin
fLine:='';
repeat
aStream.ReadBuffer(c,1);
if not (c in [CR,LF,#0]) then
fLine:=fLine+c;
until c in [CR,LF,#0];
fLinePos:=0;
end;
(*should be: object Name: Type or inherited Name: Type*)
function TDfmResourceReader.CheckTextDfm(aStream: TStream): boolean;
var tmp : string;
begin
Result:=false;
fLine:='';
while fLine='' do
ReadLine(aStream);
//skip UTF-8 BOM, if needed
if (copy(fLine,1,3)=(#$EF+#$BB+#$BF)) then
inc(fLinePos,3);
tmp:=lowercase(GetIdent);
if (tmp <> 'object') and (tmp<>'inherited') then exit;
if GetIdent='' then exit;
SkipSpaces;
if pchar(fLine)[fLinePos]<>':' then exit;
inc(fLinePos);
SkipSpaces;
fObjectName:=UpperCase(GetIdent);
if fObjectName='' then exit;
Result:=true;
fIsBinary:=false;
end;
function TDfmResourceReader.CheckBinDfm(aStream: TStream): boolean;
var s : shortstring;
b : byte;
begin
aStream.ReadBuffer(b,1);
s[0]:=Chr(b);
aStream.ReadBuffer(s[1],b);
fObjectName:=UpperCase(s);
Result:=fObjectName<>'';
fIsBinary:=true;
end;
function TDfmResourceReader.GetExtensions: string;
begin
Result:=fExtensions;
end;
function TDfmResourceReader.GetDescription: string;
begin
Result:=fDescription;
end;
procedure TDfmResourceReader.Load(aResources: TResources; aStream: TStream);
var aRes : TAbstractResource;
RawData : TResourceDataStream;
begin
if not CheckMagic(aStream) then
raise EResourceReaderWrongFormatException.Create('');
dummyName.Name:=fObjectName;
aRes:=TResourceFactory.CreateResource(dummyType,dummyName);
if fIsBinary then
begin
SetDataSize(aRes,aStream.Size-aStream.Position);
SetDataOffset(aRes,aStream.Position);
RawData:=TResourceDataStream.Create(aStream,aRes,aRes.DataSize,TCachedResourceDataStream);
SetRawData(aRes,RawData);
end
else
ObjectTextToBinary(aStream,aRes.RawData);
try
aResources.Add(aRes);
except
on e : EResourceDuplicateException do
begin
aRes.Free;
raise;
end;
end;
end;
function TDfmResourceReader.CheckMagic(aStream: TStream): boolean;
var sig : TSignature;
orig : int64;
begin
orig:=aStream.Position;
aStream.ReadBuffer(sig,4);
if sig=FilerSignature then Result:=CheckBinDfm(aStream)
else
begin
aStream.Seek(-4,soFromCurrent);
Result:=CheckTextDfm(aStream);
end;
aStream.Position:=orig;
end;
constructor TDfmResourceReader.Create;
begin
fExtensions:='.dfm .xfm .lfm';
fDescription:='DFM resource reader';
fLine:='';
fLinePos:=0;
fObjectName:='';
fIsBinary:=false;
dummyType:=TResourceDesc.Create;
dummyType.ID:=RT_RCDATA;
dummyName:=TResourceDesc.Create;
end;
destructor TDfmResourceReader.Destroy;
begin
dummyType.Free;
dummyName.Free;
end;
initialization
TResources.RegisterReader('.dfm',TDfmResourceReader);
TResources.RegisterReader('.xfm',TDfmResourceReader);
TResources.RegisterReader('.lfm',TDfmResourceReader);
end.
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