Hextoint

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unit BinHexTools;

interface
function HexToBin(HexNr : string): string;  //把十六进制字符串转换为二进制字符串
function HexCharToInt(HexToken : char):Integer; //转换一个十六进制字符为整数
function HexCharToBin(HexToken : char): string;//转换一个十六进制字符为二进制字符串
function pow(base, power: integer): integer;//指数函数
function BinStrToInt(BinStr : string) : integer;//把二进制字符串转换为整数
function DecodeSMS7Bit(PDU : string):string;// 解码一个7-bit SMS (GSM 03.38) 为ASCII码
function ReverseStr(SourceStr : string) : string; //反转一个字符串

implementation
uses sysutils, dialogs;

function HexCharToInt(HexToken : char):Integer;
begin
  {if HexToken>#97 then HexToken:=Chr(Ord(HexToken)-32);
  { use lowercase aswell }

  Result:=0;
  if (HexToken>#47) and (HexToken<#58) then       { chars 0....9 }
     Result:=Ord(HexToken)-48
  else if (HexToken>#64) and (HexToken<#71) then  { chars A....F }
     Result:=Ord(HexToken)-65 + 10;
end;

function HexCharToBin(HexToken : char): string;
var DivLeft : integer;
begin
    DivLeft:=HexCharToInt(HexToken);   { first HEX->BIN }
    Result:='';
                                      { Use reverse dividing }
    repeat                             { Trick; divide by 2 }
      if odd(DivLeft) then             { result = odd ? then bit = 1 }
        Result:='1'+Result             { result = even ? then bit = 0 }
      else
        Result:='0'+Result;
      DivLeft:=DivLeft div 2;       { keep dividing till 0 left and length = 4 }
    until (DivLeft=0) and (length(Result)=4);      { 1 token = nibble = 4 bits }
end;

function HexToBin(HexNr : string): string;
{ only stringsize is limit of binnr }
var Counter : integer;
begin
  Result:='';

  for Counter:=1 to length(HexNr) do
    Result:=Result+HexCharToBin(HexNr[Counter]);
end;

function pow(base, power: integer): integer;
var counter : integer;
begin
  Result:=1;

  for counter:=1 to power do
    Result:=Result*base;
end;

function BinStrToInt(BinStr : string) : integer;
var counter : integer;
begin
  if length(BinStr)>16 then
    raise ERangeError.Create(#13+BinStr+#13+
            'is not within the valid range of a 16 bit binary.'+#13);

  Result:=0;

  for counter:=1 to length(BinStr) do
      if BinStr[Counter]='1' then
        Result:=Result+pow(2,length(BinStr)-counter);
end;

function DecodeSMS7Bit(PDU : string):string;
var OctetStr : string;
    OctetBin : string;
    Charbin  : string;
    PrevOctet: string;
    Counter  : integer;
    Counter2 : integer;
begin
  PrevOctet:='';
  Result:='';

  for Counter:=1 to length(PDU) do
    begin
      if length(PrevOctet)>=7 then     { if 7 Bit overflow on previous }
        begin
          if BinStrToInt(PrevOctet)<>0 then
            Result:=Result+Chr(BinStrToInt(PrevOctet))
          else Result:=Result+' ';

          PrevOctet:='';
        end;

      if Odd(Counter) then            { only take two nibbles at a time }
        begin
          OctetStr:=Copy(PDU,Counter,2);
          OctetBin:=HexToBin(OctetStr);

          Charbin:='';
          for Counter2:=1 to length(PrevOctet) do
            Charbin:=Charbin+PrevOctet[Counter2];

          for Counter2:=1 to 7-length(PrevOctet) do
            Charbin:=OctetBin[8-Counter2+1]+Charbin;

          if BinStrToInt(Charbin)<>0 then Result:=Result+Chr(BinStrToInt(CharBin))
            else Result:=Result+' ';

          PrevOctet:=Copy(OctetBin,1,length(PrevOctet)+1);
        end;
    end;
end;

function ReverseStr(SourceStr : string) : string;
var Counter : integer;
begin
  Result:='';

  for Counter:=1 to length(SourceStr) do
    Result:=SourceStr[Counter]+Result;
end;

end.