EUCJPUnderflowDecodeTest.java

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/* @test
   @bug 4867457
   @summary Check for correct byte buffer underflow handling in EUC-JP
 */

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

public class EUCJPUnderflowDecodeTest {
    public static void main(String[] args) throws Exception{

        ByteBuffer bb = ByteBuffer.allocateDirect(255);
        CharBuffer cc = CharBuffer.allocate(255);


        // Test both regular EUC-JP and Linux variant

        String[] charsetNames = { "EUC_JP", "EUC-JP-LINUX" };

        for (int i = 0 ; i < charsetNames.length; i++) {
            Charset cs = Charset.forName(charsetNames[i]);
            CharsetDecoder decoder = cs.newDecoder();
            bb.clear();
            cc.clear();

            // Fakes a partial 3 byte EUC_JP (JIS-X-0212 range)
            // encoded character/byte sequence
            bb.put((byte)0x8f);
            bb.put((byte)0xa2);
            bb.flip();
            // Now decode with endOfInput method param set to
            // indicate to decoder that there is more encoded
            // data to follow in a subsequent invocation

            CoderResult result = decoder.decode(bb, cc, false);

            // java.nio.charset.CharsetDecoder spec specifies
            // that the coder ought to return CoderResult.UNDERFLOW
            // when insufficient bytes have been supplied to complete
            // the decoding operation

            if (result != CoderResult.UNDERFLOW) {
                throw new Exception("test failed - UNDERFLOW not returned");
            }

            // Repeat the test with the lead byte (minus its pursuing
            // trail byte) for the EUC-JP 2 byte (JIS208) range
            decoder.reset();
            bb.clear();
            cc.clear();
            bb.put((byte)0xa1);
            bb.flip();
            result = decoder.decode(bb, cc, false);
            if (result != CoderResult.UNDERFLOW) {
                throw new Exception("test failed");
            }

            // finally ensure that a valid JIS208 range EUC-JP
            // 2 byte value is correctly decoded when it is presented
            // at the trailing bounds of a ByteBuffer in the case where
            // charset decoder expects (endOfInput ==false) more
            //input to follow

            decoder.reset();
            bb.clear();
            cc.clear();
            bb.put((byte)0xa1);
            bb.put((byte)0xc0);
            bb.flip();

            result = decoder.decode(bb, cc, false);

            cc.flip();

            if (result != CoderResult.UNDERFLOW && cc.get() != '\uFF3c') {
                throw new Exception("test failed to decode EUC-JP (0xA1C0)");
            }
        }
    }
}