如何高效快速地在流中搜索十六进制数?
如果流很大,如何快速搜索并返回位置?
function FindInMemStream(Stream: TMemoryStream; What: String):Integer;
var
bufBuffer, bufBuffer2: array[0..254] of Char;
i: Integer;
begin
Result := 0;
i := 0;
FillChar(bufBuffer, 255, #0);
FillChar(bufBuffer2, 255, #0);
StrPCopy(@bufBuffer2, What);
Stream.Position:=0;
while Stream.Position <> Stream.Size do
begin
Stream.Read(bufBuffer[0],Length(What));
if CompareMem(@bufBuffer,@bufBuffer2,Length(What)) then
begin
Result := Stream.Position-Length(What);
Exit;
end;
i := i + 1;
Stream.Seek(i,0)
end;
end;
我希望将函数改为搜索十六进制,这个函数效率如何?您能否给我一个高效的搜索十六进制的函数?