{==============================================================================|
| Project : Delphree - Synapse                                   | 001.002.001 |
|==============================================================================|
| Content: support procedures and functions                                    |
|==============================================================================|
| The contents of this file are subject to the Mozilla Public License Ver. 1.0 |
| (the "License"); you may not use this file except in compliance with the     |
| License. You may obtain a copy of the License at http://www.mozilla.org/MPL/ |
|                                                                              |
| 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.    |
|==============================================================================|
| The Original Code is Synapse Delphi Library.                                 |
|==============================================================================|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
| Portions created by Lukas Gebauer are Copyright (c) 1999, 2000.              |
| Portions created by Hernan Sanchez are Copyright (c) 2000.                   |
| All Rights Reserved.                                                         |
|==============================================================================|
| Contributor(s):                                                              |
|   Hernan Sanchez (hernan.sanchez@iname.com)                                  |
|==============================================================================|
| History: see HISTORY.HTM from distribution package                           |
|          (Found at URL: http://www.mlp.cz/space/gebauerl/synapse/)           |
|==============================================================================}

unit SynaUtil;

interface

uses
  Blcksock, sysutils, classes, windows;

function timezone:string;
function Rfc822DateTime(t:TDateTime):String;
function CodeInt(Value:word):string;
function DeCodeInt(Value:string;Index:integer):word;
function IsIP(Value:string):Boolean;
function ReverseIP(Value:string):string;
procedure Dump (Buffer:string;DumpFile:string);
Function MibToId(mib:string):string;
Function IdToMib(id:string):string;
Function IntMibToStr(int:string):string;
function IPToID(Host: string): string;

implementation

uses
  ASN1util;

{==============================================================================}
{timezone}
function timezone:string;
var
  zoneinfo:TTimeZoneInformation;
  bias:integer;
  h,m:integer;
begin
  case GetTimeZoneInformation(Zoneinfo) of
    2:  bias:=zoneinfo.bias+zoneinfo.DaylightBias;
    1:  bias:=zoneinfo.bias+zoneinfo.StandardBias;
    else
      bias:=zoneinfo.bias;
  end;
  if bias<=0 then result:='+'
    else result:='-';
  bias:=abs(bias);
  h:=bias div 60;
  m:=bias mod 60;
  result:=result+format('%.2d%.2d',[h,m]);
end;

{==============================================================================}

{Rfc822DateTime}
function Rfc822DateTime(t:TDateTime):String;
var
  I: Integer;
  SaveDayNames: array[1..7] of string;
  SaveMonthNames: array[1..12] of string;
const
  MyDayNames: array[1..7] of string =
    ('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
  MyMonthNames: array[1..12] of string =
    ('Jan', 'Feb', 'Mar', 'Apr',
     'May', 'Jun', 'Jul', 'Aug',
     'Sep', 'Oct', 'Nov', 'Dec');
begin
  if ShortDayNames[1] = MyDayNames[1]
    then Result := FormatDateTime('ddd, d mmm yyyy hh:mm:ss', t)
    else
      begin
        for I := Low(ShortDayNames) to High(ShortDayNames) do
          begin
            SaveDayNames[I] := ShortDayNames[I];
            ShortDayNames[I] := MyDayNames[I];
          end;
        for I := Low(ShortMonthNames) to High(ShortMonthNames) do
          begin
            SaveMonthNames[I] := ShortMonthNames[I];
            ShortMonthNames[I] := MyMonthNames[I];
          end;
        Result := FormatDateTime('ddd, d mmm yyyy hh:mm:ss', t);
        for I := Low(ShortDayNames) to High(ShortDayNames) do
          ShortDayNames[I] := SaveDayNames[I];
        for I := Low(ShortMonthNames) to High(ShortMonthNames) do
          ShortMonthNames[I] := SaveMonthNames[I];
      end;
  Result:=Result+' '+Timezone;
end;

{==============================================================================}

{CodeInt}
function CodeInt(Value:word):string;
begin
  Result := Chr(Hi(Value))+ Chr(Lo(Value))
end;

{==============================================================================}

{DeCodeInt}
function DeCodeInt(Value:string;Index:integer):word;
var
  x,y:Byte;
begin
  if Length(Value)>index then x:=Ord(Value[index])
    else x:=0;
  if Length(Value)>(Index+1) then y:=Ord(Value[Index+1])
    else y:=0;
  Result:=x*256+y;
end;

{==============================================================================}

{IsIP}
function IsIP(Value:string):Boolean;
var
  n,x:integer;
begin
  Result:=true;
  x:=0;
  for n:=1 to Length(Value) do
    if not (Value[n] in ['0'..'9','.'])
      then begin
        Result:=False;
        break;
      end
      else begin
        if Value[n]='.' then Inc(x);
      end;
  if x<>3 then Result:=False;
end;

{==============================================================================}

{ReverseIP}
function ReverseIP(Value:string):string;
var
  x:integer;
begin
  Result:='';
  repeat
    x:=LastDelimiter('.',Value);
    Result:=Result+'.'+Copy(Value,x+1,Length(Value)-x);
    Delete(Value,x,Length(Value)-x+1);
  until x<1;
  if Length(Result)>0 then
    if Result[1]='.' then
      Delete(Result, 1, 1);
end;

{==============================================================================}

{dump}
procedure dump (Buffer:string;DumpFile:string);
var
  n:integer;
  s:string;
  f:Text;
begin
  s:='';
  for n:=1 to Length(Buffer) do
    s:=s+' +#$'+IntToHex(Ord(Buffer[n]),2);
  Assignfile(f,DumpFile);
  if fileexists(DumpFile) then deletefile(PChar(DumpFile));
  rewrite(f);
  try
    writeln(f,s);
  finally
    closefile(f);
  end;
end;

{==============================================================================}

{MibToId}
function MibToId(mib:string):string;
var
  x:integer;

  Function walkInt(var s:string):integer;
  var
    x:integer;
    t:string;
  begin
    x:=pos('.',s);
    if x<1 then
      begin
        t:=s;
        s:='';
      end
      else
      begin
        t:=copy(s,1,x-1);
        s:=copy(s,x+1,length(s)-x);
      end;
    result:=StrToIntDef(t,0);
  end;
begin
  result:='';
  x:=walkint(mib);
  x:=x*40+walkint(mib);
  result:=ASNEncOIDItem(x);
  while mib<>'' do
    begin
      x:=walkint(mib);
      result:=result+ASNEncOIDItem(x);
    end;
end;

{==============================================================================}

{IdToMib}
Function IdToMib(id:string):string;
var
  x,y,n:integer;
begin
  result:='';
  n:=1;
  while length(id)+1>n do
    begin
      x:=ASNDecOIDItem(n,id);
      if (n-1)=1 then
        begin
          y:=x div 40;
          x:=x mod 40;
          result:=IntTostr(y);
        end;
      result:=result+'.'+IntToStr(x);
    end;
end;

{==============================================================================}

{IntMibToStr}
Function IntMibToStr(int:string):string;
Var
  n,y:integer;
begin
  y:=0;
  for n:=1 to length(int)-1 do
    y:=y*256+ord(int[n]);
  result:=IntToStr(y);
end;

{==============================================================================}

{IPToID} //Hernan Sanchez
function IPToID(Host: string): string;
var
  s, t: string;
  i, x: integer;
begin
  Result := '';
  for x:= 1 to 3 do
    begin
      t := '';
      s := StrScan(PChar(Host), '.');
      t := Copy(Host, 1, (Length(Host) - Length(s)));
      Delete(Host, 1, (Length(Host) - Length(s) + 1));
      i := StrTointDef(t, 0);
      Result := Result + Chr(i);
    end;
  i := StrTointDef(Host, 0);
  Result := Result + Chr(i);
end;

{==============================================================================}

end.