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{
This file is part of the Free Pascal run time library.
Copyright (c) 2008 by Giulio Bernardi
Resource reader for .res 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 resreader;
{$MODE OBJFPC} {$H+}
interface
uses
Classes, SysUtils, resource;
type
{ TResResourceReader }
TResResourceReader = class (TAbstractResourceReader)
private
fExtensions : string;
fDescription : string;
dummyType : TResourceDesc;
dummyName : TResourceDesc;
procedure AlignDword(aStream : TStream);
function ReadResourceHeader(aStream : TStream) : TAbstractResource;
function ReadUnicodeString(aStream : TStream; maxsize : integer; out count : integer) : widestring;
function ReadNameID(aStream : TStream; aDesc : TResourceDesc ;maxsize : integer) : integer;
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;
//This exception is raised when end of stream is detected and expected,
//that is, before reading a new resource header. It's not an error.
type
EResourceReaderEOSReachedException = class (EResourceReaderException);
{ TResResourceReader }
procedure TResResourceReader.AlignDword(aStream: TStream);
var toskip : integer;
begin
toskip:=4-(aStream.Position mod 4);
if toskip<>4 then aStream.Seek(toskip,soFromCurrent);
end;
function TResResourceReader.ReadResourceHeader(aStream: TStream
): TAbstractResource;
var DataSize : longword;
HeaderSize : longword;
toread : longword;
DataVersion : longword;
MemoryFlags : word;
LanguageID : word;
Version : longword;
Characteristics : longword;
DataOffset : longword;
RawData : TResourceDataStream;
begin
Result:=Nil;
if aStream.Read(DataSize,4)<>4 then
exit;
try
aStream.ReadBuffer(HeaderSize,4);
{$IFDEF ENDIAN_BIG}
DataSize:=SwapEndian(DataSize);
HeaderSize:=SwapEndian(HeaderSize);
{$ENDIF}
toread:=headersize-8;
toread:=toread-ReadNameID(aStream,dummyType,toread-18);
toread:=toread-ReadNameID(aStream,dummyName,toread-16);
AlignDword(aStream);
aStream.ReadBuffer(DataVersion,4);
aStream.ReadBuffer(MemoryFlags,2);
aStream.ReadBuffer(LanguageID,2);
aStream.ReadBuffer(Version,4);
aStream.ReadBuffer(Characteristics,4);
{$IFDEF ENDIAN_BIG}
DataVersion:=SwapEndian(DataVersion);
MemoryFlags:=SwapEndian(MemoryFlags);
LanguageID:=SwapEndian(LanguageID);
Version:=SwapEndian(Version);
Characteristics:=SwapEndian(Characteristics);
{$ENDIF}
DataOffset:=aStream.Position;
Result:=TResourceFactory.CreateResource(dummyType,dummyName);
SetDataSize(Result,DataSize);
SetHeaderSize(Result,HeaderSize);
Result.DataVersion:=DataVersion;
Result.MemoryFlags:=MemoryFlags;
Result.LangID:=LanguageID;
Result.Version:=Version;
Result.Characteristics:=Characteristics;
SetDataOffset(Result,DataOffset);
RawData:=TResourceDataStream.Create(aStream,Result,Result.DataSize,TCachedResourceDataStream);
SetRawData(Result,RawData);
if DataSize>0 then
begin
aStream.Seek(DataSize,soFromCurrent);
AlignDword(aStream);
end;
except
on e : EReadError do
raise EResourceReaderUnexpectedEndOfStreamException.Create('');
end;
end;
function TResResourceReader.ReadUnicodeString(aStream: TStream; maxsize: integer;
out count : integer): widestring;
var w : word;
begin
Result:='';
w:=0;
count:=0;
repeat
aStream.ReadBuffer(w,2);
if w<>0 then
begin
{$IFDEF ENDIAN_BIG}
w:=SwapEndian(w);
{$ENDIF}
Result:=Result+widechar(w);
end;
dec(maxsize);
inc(count);
until (w=0) or (maxsize<=0);
count:=count*2;
end;
function TResResourceReader.ReadNameID(aStream : TStream; aDesc : TResourceDesc;
maxsize : integer) : integer;
var tmpw : word;
ws : widestring;
begin
aStream.ReadBuffer(tmpw,2);
{$IFDEF ENDIAN_BIG}
tmpw:=SwapEndian(tmpw);
{$ENDIF}
if tmpw = $FFFF then
begin
aStream.ReadBuffer(tmpw,2);
{$IFDEF ENDIAN_BIG}
tmpw:=SwapEndian(tmpw);
{$ENDIF}
aDesc.ID:=tmpw;
Result:=4;
end
else
begin
ws:=widechar(tmpw)+ReadUnicodeString(aStream,maxsize,Result);
aDesc.Name:=ws;
inc(Result,2);
end;
end;
function TResResourceReader.GetExtensions: string;
begin
Result:=fExtensions;
end;
function TResResourceReader.GetDescription: string;
begin
Result:=fDescription;
end;
procedure TResResourceReader.Load(aResources: TResources; aStream: TStream);
var aRes : TAbstractResource;
begin
if not CheckMagic(aStream) then
raise EResourceReaderWrongFormatException.Create('');
Repeat
aRes:=ReadResourceHeader(aStream);
if (aRes<>Nil) then
try
aResources.Add(aRes);
except
on e : EResourceDuplicateException do
begin
aRes.Free;
raise;
end;
end;
Until (aRes=Nil);
end;
function TResResourceReader.CheckMagic(aStream: TStream): boolean;
var lw : longword;
begin
Result:=false;
aStream.ReadBuffer(lw,4); if lw<>0 then exit; //datasize = 0
aStream.ReadBuffer(lw,4);
{$IFDEF ENDIAN_BIG}
lw:=SwapEndian(lw);
{$ENDIF}
if lw<>$20 then exit; //headersize = $20
aStream.ReadBuffer(lw,4);
{$IFDEF ENDIAN_BIG}
lw:=SwapEndian(lw);
{$ENDIF}
if lw<>$FFFF then exit; //type = $0000FFFF
aStream.ReadBuffer(lw,4);
{$IFDEF ENDIAN_BIG}
lw:=SwapEndian(lw);
{$ENDIF}
if lw<>$FFFF then exit; //name = $0000FFFF
aStream.ReadBuffer(lw,4); if lw<>0 then exit; //dataversion = 0
aStream.ReadBuffer(lw,4); if lw<>0 then exit; //memflags,langid = 0
aStream.ReadBuffer(lw,4); if lw<>0 then exit; //version = 0
aStream.ReadBuffer(lw,4); if lw<>0 then exit; //characteristics = 0
Result:=true;
end;
constructor TResResourceReader.Create;
begin
fExtensions:='.res';
fDescription:='.res resource reader';
dummyType:=TResourceDesc.Create;
dummyName:=TResourceDesc.Create;
end;
destructor TResResourceReader.Destroy;
begin
dummyType.Free;
dummyName.Free;
end;
initialization
TResources.RegisterReader('.res',TResResourceReader);
end.
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