Unicode and ascii conversion help needed

Question

I am trying to read passwords from a foxpro .dbf. The encrpytion of the password is crude, it takes the ascii value of each char entered and adds an integer value to it, then stores the complete password to the table. So to decode, just subtract same integer value from each chars retieved from .dbf. pretty simple.
The problem is that java chars and strings are unicode, so when my java applet retrieves these ascii values from the .dbf they are treated as unicode chars, if the ascii value is over 127 I have problems.
The question. how can i retrieve these ascii values as ascii values in java?
Should I use an InputStream like:
InputStream is=rs.getAsciiStream("password");
Is there a way to convert from unicode to extended ascii?
Some examples would be helpful, Thanks in advance.

Answer 1

version 1
import java.nio.charset.Charset;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
class Test {
    static char[] asciiToChar(byte[] b) {
        Charset cs = Charset.forName("ASCII");
        ByteBuffer bbuf = ByteBuffer.wrap(b);
        CharBuffer cbuf = cs.decode(bbuf);
        return cbuf.array();
    static byte[] charToAscii(char[] c) {
        Charset cs = Charset.forName("ASCII");
        CharBuffer cbuf = CharBuffer.wrap(c);
        ByteBuffer bbuf = cs.encode(cbuf);
        return bbuf.array();
}version 2
import java.io.*;
import java.nio.charset.Charset;
class Test {
    static char[] asciiToChar(byte[] b) throws IOException {
        Charset cs = Charset.forName("ASCII");
        ByteArrayInputStream bis = new ByteArrayInputStream(b);
        InputStreamReader isr = new InputStreamReader(bis, cs);
        char[] c = new char[b.length];
        isr.read(c, 0, c.length);
        return c;
    static byte[] charToAscii(char[] c) throws IOException {
        Charset cs = Charset.forName("ASCII");
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        OutputStreamWriter osw = new OutputStreamWriter(bos, cs);
        osw.write(c, 0, c.length);
        osw.flush();
        byte[] b = bos.toByteArray();
        return b;
}