Problem reading in ascii
I am being given an ascii file that has been bitshifted by 1 place. I am to simply read in each character and then divide its value by 2 and output the character. This all works fine except for the odd few character.
try
{
BufferedReader br =new BufferedReader(new FileReader("C:\\bitshift.txt" ));
int rd_line;
while ((rd_line = br.read()) != -1)
{
//rd_line = (rd_line%255)/2;
rd_line = rd_line/2;
System.out.println((char)rd_line +"-" + rd_line);
}
}
catch( IOException e)
{
}
I have read some topics on this and think a possible reason is that the buffered reader think it is unicode and not ascii. Is this correct or am I way off
Regards
[1222 byte] By [
jayclarkea] at [2007-10-2 10:33:56]
Doesn't work means the following. This is an output of my results.
Note: all lower case characters are fine its just upper case.
The '?' is meant to be 'A' and seeing as I am outputting half of what i read 4109, I must have read the number (4109*2). I have checked on the system that is supplying me with the file to read from and that is passing me the correct value of ascii 130.
?-4109
If I am being passed Ascii, is there a way to read in ascii rather that unicode?
Regards
The following creates an adapted InputStream and shifts the byte behind the scenes.
import java.io.*;
class ShiftedInputStream extends InputStream
{
ShiftedInputStream(InputStream source)
{
source_ = source;
}
public int read() throws IOException
{
int bite = source_.read();
if (bite != -1)
bite >>>= 1;
return bite;
}
private InputStream source_;
}
public class Fred21
{
public static void main(String[] args)
{
try
{
BufferedReader br = new BufferedReader( new InputStreamReader(new ShiftedInputStream(new FileInputStream( "C:\\bitshift.txt" )), "ASCII"));
String line = null;
while ((line = br.readLine()) != null)
{
System.out.println(line);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
> Thats what im saying, 4109 is not A. 130 is A. But> when I am reading in 130, and then divide it by 2 I> get 4109 for some reason and a ?Ignore your original code! It will not work!
Thanks very much. Could you explain what the following does. I understand it shift the bits but not sure how?
> class ShiftedInputStream extends InputStream
> {
>ShiftedInputStream(InputStream source)
>{
> source_ = source;
>}
>
>public int read() throws IOException
>{
> int bite = source_.read();
> if (bite != -1)
> bite >>>= 1;
> return bite;
>}
>
>private InputStream source_;
> }
Regards
> Thanks very much. Could you explain what the
> following does. I understand it shift the bits but
> not sure how?
It reads a byte from the original stream and if it is not the end of file (-1) then it divides the value by 2 (using a single shift right) before returning it!
