Title: Converting from Windows ASCII to UNIX ASCII Text Files
Question: How do you convert between Windows and UNIX ASCII files? Here's how to stop Notepad from displaying a mess...
Answer:
Ever loaded what you beleived to be a nice text file (HTML as well) into Notepad and found it to be a complete mess?
If yes then the reason is because Microsoft Windows uses CRLF (0x0D 0x0A) to end lines and UNIX, Linux, Apple Mac and most other OS's use just LF (0x0A) - they just have to be awkward don't they...
Below are two routines you can use to switch between formats, it also shows an example of callbacks and streams:
type
TConvertNotifyKind = (nkMax, nkProgress);
TConvertNotify = procedure(Kind: TConvertNotifyKind; Value: LongInt);
// UnixToWin -- Convert a UNIX single LF text stream to a Windows CRLF text stream
function UnixToWin(InStream: TStream; OutStream: TStream; Notify: TConvertNotify): Boolean;
var
B, NewB: Byte;
Value: LongInt;
begin
if not Assigned(InStream) then
begin
Result := False;
Exit;
end;
if not Assigned(OutStream) then
begin
Result := False;
Exit;
end;
if Assigned(Notify) then Notify(nkMax,InStream.Size);
Value := 0;
while InStream.Position begin
InStream.Read(B,SizeOf(Byte));
case B of
$0A: begin
NewB := $0D;
OutStream.Write(NewB,SizeOf(Byte));
NewB := $0A;
OutStream.Write(NewB,SizeOf(Byte));
end;
else
OutStream.Write(B,SizeOf(Byte));
end;
Inc(Value);
if Assigned(Notify) then Notify(nkProgress,Value);
end;
if Value = InStream.Size then
begin
if Assigned(Notify) then Notify(nkProgress,0);
end;
Result := True;
end;
// WinToUnix -- Convert a CRLF Windows text stream to single LF UNIX text stream
function WinToUnix(InStream: TStream; OutStream: TStream; Notify: TConvertNotify): Boolean;
var
B: Byte;
Value: LongInt;
begin
if not Assigned(InStream) then
begin
Result := False;
Exit;
end;
if not Assigned(OutStream) then
begin
Result := False;
Exit;
end;
if Assigned(Notify) then Notify(nkMax,InStream.Size);
Value := 0;
while InStream.Position begin
InStream.Read(B,SizeOf(Byte));
if B $0A then
begin
OutStream.Write(B,SizeOf(Byte));
end;
Inc(Value);
if Assigned(Notify) then Notify(nkProgress,Value);
end;
OutStream.Seek(SizeOf(Byte),soFromEnd);
OutStream.Read(B,SizeOf(B));
if B $0D then
begin
B := $0D;
OutStream.Write(B,SizeOf(Byte));
end;
if Value = InStream.Size then
begin
if Assigned(Notify) then Notify(nkProgress,0);
end;
Result := True;
end;
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P.S: If this is wrong, let me know!