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{
cdrvectorialreader.pas
Reads a Corel Draw vectorial file
CDR file format specification obtained from:
ADOBE SYSTEMS INCORPORATED. PDF Reference: Adobe®
Portable Document Format. San Jose, 2006. (Sixth edition).
AUTHORS: Felipe Monteiro de Carvalho
License: The same modified LGPL as the Free Pascal RTL
See the file COPYING.modifiedLGPL for more details
}
unit cdrvectorialreader;
{$ifdef fpc}
{$mode delphi}
{$endif}
interface
uses
Classes, SysUtils,
pdfvrlexico, pdfvrsintatico, pdfvrsemantico, avisozlib,
fpvectorial;
type
TCDRChunk = class
Name: array[0..3] of Char;
Size: Cardinal;
ChildChunks: TFPList;
end;
TCDRChunkClass = class of TCDRChunk;
TvCDRInternalData = TCDRChunk;
TCDRChunkVRSN = class(TCDRChunk)
VersionStr: string;
VersionNum: Integer;
end;
{ TvCDRVectorialReader }
TvCDRVectorialReader = class(TvCustomVectorialReader)
private
procedure ReadVersionChunk(AStream: TStream; var AData: TCDRChunk);
function AddNewChunk(var AData: TCDRChunk; AClass: TCDRChunkClass): TCDRChunk;
public
{ General reading methods }
procedure ReadFromStream(AStream: TStream; AData: TvVectorialDocument); override;
{ File format exploring methods }
procedure ExploreFromFile(AFilename: string; out AData: TvCDRInternalData);
procedure ExploreFromStream(AStream: TStream; out AData: TvCDRInternalData);
end;
implementation
{ TvPDFVectorialReader }
procedure TvCDRVectorialReader.ReadVersionChunk(AStream: TStream;
var AData: TCDRChunk);
var
lDWord: DWord;
lChunk: TCDRChunkVRSN absolute AData;
lVerBytes: array[0..1] of Byte;
begin
// Read the Chunk name
lDWord := AStream.ReadDWord();
// Read the Chunk size
lDWord := AStream.ReadDWord();
// Read the version
AStream.Read(lVerBytes, 2);
if (lVerBytes[0] = $BC) and (lVerBytes[1] = $02) then
begin
lChunk.VersionNum := 7;
lChunk.VersionStr := 'CorelDraw 7';
end
else if (lVerBytes[0] = $20) and (lVerBytes[1] = $03) then
begin
lChunk.VersionNum := 8;
lChunk.VersionStr := 'CorelDraw 8';
end
else if (lVerBytes[0] = $21) and (lVerBytes[1] = $03) then
begin
lChunk.VersionNum := 8;
lChunk.VersionStr := 'CorelDraw 8bidi';
end
else if (lVerBytes[0] = $84) and (lVerBytes[1] = $03) then
begin
lChunk.VersionNum := 9;
lChunk.VersionStr := 'CorelDraw 9';
end
else if (lVerBytes[0] = $E8) and (lVerBytes[1] = $03) then
begin
lChunk.VersionNum := 10;
lChunk.VersionStr := 'CorelDraw 10';
end
else if (lVerBytes[0] = $4C) and (lVerBytes[1] = $04) then
begin
lChunk.VersionNum := 11;
lChunk.VersionStr := 'CorelDraw 11';
end
else if (lVerBytes[0] = $B0) and (lVerBytes[1] = $04) then
begin
lChunk.VersionNum := 12;
lChunk.VersionStr := 'CorelDraw 12';
end
else if (lVerBytes[0] = $14) and (lVerBytes[1] = $05) then
begin
lChunk.VersionNum := 13;
lChunk.VersionStr := 'CorelDraw X3';
end;
end;
function TvCDRVectorialReader.AddNewChunk(var AData: TCDRChunk; AClass: TCDRChunkClass): TCDRChunk;
begin
if AData.ChildChunks = nil then AData.ChildChunks := TFPList.Create;
Result := AClass.Create;
AData.ChildChunks.Add(Result);
end;
procedure TvCDRVectorialReader.ReadFromStream(AStream: TStream;
AData: TvVectorialDocument);
begin
end;
procedure TvCDRVectorialReader.ExploreFromFile(AFilename: string;
out AData: TvCDRInternalData);
var
FileStream: TFileStream;
begin
FileStream := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyNone);
try
ExploreFromStream(FileStream, AData);
finally
FileStream.Free;
end;
end;
procedure TvCDRVectorialReader.ExploreFromStream(AStream: TStream;
out AData: TvCDRInternalData);
var
lRIFF: array[0..3] of Char;
lDocSize, lDWord: Cardinal;
lChild: TCDRChunk;
begin
// Create the data object
AData := TCDRChunk.Create;
// All CorelDraw files starts with "RIFF"
AStream.Read(lRIFF, 4);
if lRIFF <> 'RIFF' then
raise Exception.Create('[TvCDRVectorialReader.ExploreFromStream] The Corel Draw RIFF file marker wasn''t found.');
// And then 4 bytes for the document size
lDocSize := AStream.ReadDWord();
// And mroe 4 bytes of other stuff
lDWord := AStream.ReadDWord();
// Now comes the version
lChild := AddNewChunk(AData, TCDRChunkVRSN);
ReadVersionChunk(AStream, lChild);
end;
initialization
RegisterVectorialReader(TvCDRVectorialReader, vfCorelDrawCDR);
end.
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