CodepageCreator.java

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;

/**
 * Create codepage files for supported encodings.
 * @author aNNiMON
 */
public class CodepageCreator {
    
    private static final String FOLDER_NAME = "codepages";

    public static void main(String[] args) {
        new CodepageCreator().process();
    }
    
    private Charset charset;

    public void process() {
        createCodepageFolder();
        
        for (String encodingName : Charset.availableCharsets().keySet()) {
            charset = Charset.forName(encodingName);
            saveCodepage(encodingName);
        }
    }
    
    private void createCodepageFolder() {
        File dir = new File(FOLDER_NAME);
        dir.mkdir();
    }
    
    private void saveCodepage(String name) {
        try {
            String path = FOLDER_NAME + File.separator + name + ".cp";
            File out = new File(path);
            out.createNewFile();
            FileOutputStream fos = new FileOutputStream(out);
            DataOutputStream dos = new DataOutputStream(fos);
            writeChars(dos, 0x80, 0xff);
            dos.flush();
            dos.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    private void writeChars(DataOutputStream dos, int from, int to) throws IOException {
        for (int index = from; index <= to; index++) {
            String charStr = new String(new byte[] {(byte) index}, charset);
            dos.writeChar(charStr.charAt(0));
        }
    }
}