Examples of java.io.InputStream.mark()

java.io.InputStream.mark()
Set a Mark position in this InputStream. The parameter readLimit indicates how many bytes can be read before a mark is invalidated. Sending reset() will reposition the Stream back to the marked position provided readLimit has not been surpassed.
This default implementation does nothing and concrete subclasses must provide their own implementations. @param readlimit the number of bytes to be able to read before invalidating the mark.

                    return wrapped.markSupported();
                }


                @Override
                public void mark(int readlimit) {
                    wrapped.mark(readlimit);
                }


                @Override
                public void reset() throws IOException {
                    wrapped.reset();

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                    return wrapped.markSupported();
                }


                @Override
                public void mark(int readlimit) {
                    wrapped.mark(readlimit);
                }


                @Override
                public void reset() throws IOException {
                    wrapped.reset();

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        InputStream is = zfile.getInputStream(zentry);
        byte[] rbuf1 = new byte[12];
        byte[] rbuf2 = new byte[12];
        int r = is.read(rbuf1, 0, 4);
        assertEquals(4, r);
        is.mark(0);
        r = is.read(rbuf1);
        assertEquals(8, r);
        assertEquals(-1, is.read());
        
        is.reset();

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        byte[] rbuf3 = new byte[4185];
        ZipEntry zentry2 = zfile.getEntry("File3.txt");
        is = zfile.getInputStream(zentry2);
        r = is.read(rbuf3, 0, 3000);
        assertEquals(3000, r);
        is.mark(0);
        r = is.read(rbuf3);
        assertEquals(1183, r);
        assertEquals(-1, is.read());
        
        is.reset();

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        for (; position < 3; position++) {
            assertEquals("Read Before Mark [" + position +"]",  position, input.read());
        }


        // Mark
        input.mark(readlimit);


        // Read further
        for (int i = 0; i < 3; i++) {
            assertEquals("Read After Mark [" + i +"]",  (position + i), input.read());
        }

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    public void testMarkNotSupported() throws Exception {
        InputStream input = new TestNullInputStream(100, false, true);
        assertFalse("Mark Should NOT be Supported", input.markSupported());


        try {
            input.mark(5);
            fail("mark() should throw UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            assertEquals("mark() error message",  "Mark not supported", e.getMessage());
        }

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        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertTrue(in.markSupported());


        in.read();
        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());

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        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        assertTrue(in.markSupported());


        in.read();
        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());

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    public void testMarkResetBeforeReadWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertTrue(in.markSupported());


        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());

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    public void testMarkResetBeforeReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        assertTrue(in.markSupported());


        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());

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