Examples of java.io.InputStream.reset()

java.io.InputStream.reset()
Reset this InputStream to the last marked location. If the readlimit has been passed or no mark has been set, throw IOException. This implementation throws IOException and concrete subclasses should provide proper implementations. @throws IOException If the stream is already closed or another IOException occurs.

        r1 = is.read(rbuf1);
        assertEquals(rbuf1.length, r1);
        r2 = is.read(rbuf2);
        assertEquals(rbuf2.length, r2);
        
        is.reset();
        r2 = is.read(rbuf2);
        assertEquals(rbuf2.length, r2);
        is.close();


        // read a compressed entry

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        byte[] rbuf3 = new byte[4185];
        ZipEntry zentry2 = zfile.getEntry("File3.txt");
        is = zfile.getInputStream(zentry2);
        r1 = is.read(rbuf3);
        assertEquals(4183, r1);
        is.reset();
        
        r1 = is.read(rbuf3);
        assertEquals(4183, r1);
        is.close();

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        is.close();


        is = zfile.getInputStream(zentry2);
        r1 = is.read(rbuf3, 0, 3000);
        assertEquals(3000, r1);
        is.reset();
        r1 = is.read(rbuf3, 0, 3000);
        assertEquals(3000, r1);
        is.close();
    }

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        is.mark(0);
        r = is.read(rbuf1);
        assertEquals(8, r);
        assertEquals(-1, is.read());
        
        is.reset();
        r = is.read(rbuf2);
        assertEquals(8, r);
        assertEquals(-1, is.read());
        is.close();

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        is.mark(0);
        r = is.read(rbuf3);
        assertEquals(1183, r);
        assertEquals(-1, is.read());
        
        is.reset();
        r = is.read(rbuf3);
        assertEquals(1183, r);
        assertEquals(-1, is.read());
        is.close();
    }

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            InputStream in = new ByteArrayInputStream(out.toByteArray());


            // should not cause SecurityException
            new ObjectInputStream(in);
            in.reset();


            // should not cause SecurityException
            new ObjectInputStream(in) {};
            in.reset();

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            new ObjectInputStream(in);
            in.reset();


            // should not cause SecurityException
            new ObjectInputStream(in) {};
            in.reset();


            try {
                new ObjectInputStream(in) {
                    @Override
                    public Object readUnshared() throws IOException, ClassNotFoundException {

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                fail("should throw SecurityException 1");
            } catch (SecurityException e) {
                // Expected
            }


            in.reset();
            try {
                new ObjectInputStream(in) {
                    @Override
                    public GetField readFields() throws IOException,
                            ClassNotFoundException, NotActiveException {

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        assertTrue("Mark Should be Supported", input.markSupported());


        // No Mark
        try {
            input.reset();
            fail("Read limit exceeded, expected IOException ");
        } catch (IOException e) {
            assertEquals("No Mark IOException message",
                         "No position has been marked",
                         e.getMessage());

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


        // Reset
        input.reset();


        // Read From marked position
        for (int i = 0; i < readlimit + 1; i++) {
            assertEquals("Read After Reset [" + i +"]",  (position + i), input.read());
        }

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