Java Program Mapping Unicode to GB2312

After published my GB2312 to Unicode conversion table, I got requests from readers asking for Unicode to GB2312 conversion table. So I modified my original program to produce a table that maps a Unicode code to a GB2312 code.

The output of this program is presented in the next chapter.

/**
 * UnicodeGB2312.java
 * Copyright (c) 1997-2003 by Dr. Herong Yang
 */
import java.io.*;
import java.nio.*;
import java.nio.charset.*;
class UnicodeGB2312 {
   static OutputStream out = null;
   static char hexDigit[] = {'0', '1', '2', '3', '4', '5', '6', '7',
                             '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
   static int b_out[] = {201,267,279,293,484,587,625,657,734,782,827,
      874,901,980,1001,5590,8801};
   static int e_out[] = {216,268,280,294,494,594,632,694,748,794,836,
      894,903,994,1594,5594,9494};
   public static void main(String[] a) {
      try {
         out = new FileOutputStream("unicode_gb2312.gb");
         writeCode();
         out.close();
      } catch (IOException e) {
         System.out.println(e.toString());
      }
   }
   public static void writeCode() throws IOException {
      CharsetEncoder gbec = Charset.forName("GBK").newEncoder();
      char[] ca = new char[1];
      CharBuffer cb = null;
      ByteBuffer gbbb = null;
      writeHeader();
      int count = 0;
      for (int i=0; i<0x010000; i++) {
         ca[0] = (char) i;
         cb = CharBuffer.wrap(ca);
         try {
            gbbb = gbec.encode(cb);
         } catch (CharacterCodingException e) {
            gbbb = null;
         }
         if (validGB(gbbb)) {
            count++;
            writeHex((byte) (ca[0] >>> 8));
            writeHex((byte) (ca[0] & 0xff));
            writeString(" ");
            writeByteBuffer(gbbb,2);
            writeString(" ");
            writeByte(gbbb.get(0));
            writeByte(gbbb.get(1));
            if (count%5 == 0) writeln();
            else writeString("   ");
         }
      }
      if (count%5 != 0) writeln();
      writeFooter();
      System.out.println("Number of GB characters wrote: "+count);
   }
   public static boolean validGB(ByteBuffer gbbb) {
      if (gbbb==null) return false; 
      else if (gbbb.limit()!=2) return false; 
      else {
         byte hi = gbbb.get(0);
         byte lo = gbbb.get(1);
         if ((hi&0xFF)<0xA0) return false;
         if ((lo&0xFF)<0xA0) return false;
         int i = (hi&0xFF) - 0xA0;
         int j = (lo&0xFF) - 0xA0;
         if (i<1 || i>94) return false;
         if (j<1 || j>94) return false;
         for (int l=0; l<b_out.length; l++) {
            if (i*100+j>=b_out[l] && i*100+j<=e_out[l]) return false;
         }
      }
      return true;
   }
   public static void writeHeader() throws IOException {
      writeString("<pre>");
      writeln();
      writeString("Uni. GB   ");
      writeGBSpace();
      writeString("   ");
      writeString("Uni. GB   ");
      writeGBSpace();
      writeString("   ");
      writeString("Uni. GB   ");
      writeGBSpace();
      writeString("   ");
      writeString("Uni. GB   ");
      writeGBSpace();
      writeString("   ");
      writeString("Uni. GB   ");
      writeGBSpace();
      writeln();
      writeln();
   }
   public static void writeFooter() throws IOException {
      writeString("</pre>");
      writeln();
   }
   public static void writeln() throws IOException {
      out.write(0x0D);
      out.write(0x0A);
   }
   public static void writeGBSpace() throws IOException {
      out.write(0xA1);
      out.write(0xA1);
   }
   public static void writeByteBuffer(ByteBuffer b, int l)
      throws IOException {
      int i = 0;
      if (b==null) {
      	 writeString("null");
      	 i = 2;
      } else {
	for (i=0; i<b.limit(); i++) writeHex(b.get(i));
      }
      for (int j=i; j<l; j++) writeString("  ");
   }
   public static void writeString(String s) throws IOException {
      if (s!=null) {
         for (int i=0; i<s.length(); i++) {
            out.write((int) (s.charAt(i) & 0xFF));
         }
      }         
   }
   public static void writeHex(byte b) throws IOException {
      out.write((int) hexDigit[(b >> 4) & 0x0F]);
      out.write((int) hexDigit[b & 0x0F]);
   }
   public static void writeByte(byte b) throws IOException {
      out.write(b & 0xFF);
   }
}

This site Web