TestCp834_SBCS.java

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/* @test
   @bug 6379808
   @summary Check all Cp933 SBCS characters are not supported in Cp834
 */

import java.io.*;
import java.nio.*;
import java.nio.charset.*;

public class TestCp834_SBCS {
    public static void main(String args[]) throws Exception {
        // The correctness of 1:1 mapping is Coverted by CoderTest.java
        // and TestConv.java, we only need to verify that SBCS characters
        // are not supported by this charset.
        CharsetEncoder enc834 = Charset.forName("Cp834")
                                       .newEncoder()
                                       .onUnmappableCharacter(CodingErrorAction.REPLACE)
                                       .onMalformedInput(CodingErrorAction.REPLACE);

        CharsetDecoder dec834 = Charset.forName("Cp834")
                                       .newDecoder()
                                       .onUnmappableCharacter(CodingErrorAction.REPLACE)
                                       .onMalformedInput(CodingErrorAction.REPLACE);

        CharsetDecoder dec933 = Charset.forName("Cp933")
                                       .newDecoder()
                                       .onUnmappableCharacter(CodingErrorAction.REPLACE)
                                       .onMalformedInput(CodingErrorAction.REPLACE);
        byte[] ba = new byte[1];
        byte[] ba2 = new byte[2];
        ByteBuffer dbb = ByteBuffer.allocateDirect(10);
        char[] ca = new char[1];
        char c;
        for (int i = 0; i <= 0xff; i++) {
            if (i != 0xe && i != 0xf) {   // no SI/SO
                ba[0] = (byte)i;
                CharBuffer cb = dec933.decode(ByteBuffer.wrap(ba));
                if ((c = cb.get()) != '\ufffd') {
                    // OK, this is a SBCS character in Cp933
                    if (dec834.decode(ByteBuffer.wrap(ba)).get() != '\ufffd')
                        throw new Exception("SBCS is supported in IBM834 decoder");

                    if (enc834.canEncode(c))
                        throw new Exception("SBCS can be encoded in IBM834 encoder");

                    ca[0] = c;
                    ByteBuffer bb = enc834.encode(CharBuffer.wrap(ca));
                    if (bb.get() != (byte)0xfe || bb.get() != (byte)0xfe)
                        throw new Exception("SBCS is supported in IBM834 encoder");
                }
            }
        }
    }
}