In order to produce the mapping tables for this book, I wrote the following Java program, GB2312Unicode.java.
The output of this program is presented in the next 3 chapters.
/** * GB2312Unicode.java * Copyright (c) 1997-2003 by Dr. Herong Yang */import java.io.*;import java.nio.*;import java.nio.charset.*;class GB2312Unicode { 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, 874,901,980,5590}; static int e_out[] = {216,268,280,294,494,594,632,694,748,794,836, 894,903,994,5594}; public static void main(String[] args) { try { out = new FileOutputStream("gb2312_unicode.gb"); writeCode(); out.close(); } catch (IOException e) { System.out.println(e.toString()); } } public static void writeCode() throws IOException { boolean reserved = false; String name = null; // GB2312 is not supported by JDK. So I am using GBK. CharsetDecoder gbdc = Charset.forName("GBK").newDecoder(); CharsetEncoder uxec = Charset.forName("UTF-16BE").newEncoder(); CharsetEncoder u8ec = Charset.forName("UTF-8").newEncoder(); ByteBuffer gbbb = null; ByteBuffer uxbb = null; ByteBuffer u8bb = null; CharBuffer cb = null; int count = 0; for (int i=1; i<=94; i++) { // Defining row settings if (i>=1 && i<=9) { reserved = false; name = "Graphic symbols"; } else if (i>=10 && i<=15) { reserved = true; name = "Reserved"; } else if (i>=16 && i<=55) { reserved = false; name = "Level 1 characters"; } else if (i>=56 && i<=87) { reserved = false; name = "Level 2 characters"; } else if (i>=88 && i<=94) { reserved = true; name = "Reserved"; } // writing row title writeln(); writeString(""); writeNumber(i); writeString(" Row: "+name); writeln(); writeString("
"); writeln(); if (!reserved) { writeln(); writeHeader(); // looping through all characters in one row for (int j=1; j<=94; j++) { byte hi = (byte)(0xA0 + i); byte lo = (byte)(0xA0 + j); if (validGB(i,j)) { // getting GB, UTF-16BE, UTF-8 codes gbbb = ByteBuffer.wrap(new byte[]{hi,lo}); try { cb = gbdc.decode(gbbb); uxbb = uxec.encode(cb); cb.rewind(); u8bb = u8ec.encode(cb); } catch (CharacterCodingException e) { cb = null; uxbb = null; u8bb = null; } } else { cb = null; uxbb = null; u8bb = null; } writeNumber(i); writeNumber(j); writeString(" "); if (cb!=null) { writeByte(hi); writeByte(lo); writeString(" "); writeHex(hi); writeHex(lo); count++; } else { writeGBSpace(); writeString(" null"); } writeString(" "); writeByteBuffer(uxbb,2); writeString(" "); writeByteBuffer(u8bb,3); if (j%2 == 0) { writeln(); } else { writeString(" "); } } writeFooter(); } } System.out.println("Number of GB characters wrote: "+count); } public static void writeln() throws IOException { out.write(0x0D); out.write(0x0A); } public static void writeByte(byte b) throws IOException { out.write(b & 0xFF); } 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 > 4) & 0x0F]); out.write((int) hexDigit[b & 0x0F]); } public static void writeHeader() throws IOException { writeString(" "); writeln(); writeString("Q.W. "); writeGBSpace(); writeString(" GB Uni. UTF-8 "); writeString(" "); writeString("Q.W. "); writeGBSpace(); writeString(" GB Uni. UTF-8 "); writeln(); writeln(); } public static void writeFooter() throws IOException { writeString(""); writeln(); } public static boolean validGB(int i,int j) { for (int l=0; l =b_out[l] && i*100+j<=e_out[l]) return false; } return true; }}