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.

    byte[] big = newPreFilledByteArray(5);
    InputStream bin = new ByteArrayInputStream(big);
    InputStream lin = ByteStreams.limit(bin, 2);


    // also test available
    lin.mark(2);
    assertEquals(2, lin.available());
    lin.skip(1);
    assertEquals(1, lin.available());


    lin.reset();

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     * @throws IOException if something goes wrong
     */
    public void testMarkResetSimplePosZero()
            throws IOException {
        InputStream is = getStream(100);
        is.mark(10);
        assertEquals(10, is.read(new byte[10]));
        is.reset();
        checkBeginningOfStream(is);
    }

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     */
    public void testMarkResetSimplePosNonZero()
            throws IOException {
        InputStream is = getStream(200);
        assertEquals(127, is.read(new byte[127]));
        is.mark(10);
        byte[] readBeforeReset = new byte[10];
        byte[] readAfterReset = new byte[10];
        assertEquals(10, is.read(readBeforeReset));
        is.reset();
        assertEquals(10, is.read(readAfterReset));

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        InputStream is = getStream(128*1024);
        byte[] buf = new byte[DEFAULT_INTERNAL_BUFFER_SIZE - 2*1024];
        fillArray(is, buf);
        // The following mark fits within the existing default buffer, but the
        // bytes after the mark have to be shifted to the left.
        is.mark(4*1024);
        byte[] readBeforeReset = new byte[3*1024];
        byte[] readAfterReset = new byte[3*1024];
        fillArray(is, readBeforeReset);
        // Obtain something to compare with.
        InputStream src = getStream(128*1024);

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        InputStream is = getStream(128*1024);
        is.read();
        is.read();
        // The following mark fits within the existing default buffer, but the
        // bytes after the mark have to be shifted to the left.
        is.mark(DEFAULT_INTERNAL_BUFFER_SIZE -6);
        byte[] readBeforeReset = new byte[DEFAULT_INTERNAL_BUFFER_SIZE -6];
        byte[] readAfterReset = new byte[DEFAULT_INTERNAL_BUFFER_SIZE -6];
        fillArray(is, readBeforeReset);
        // Obtain something to compare with.
        InputStream src = getStream(128*1024);

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     * @throws IOException if something goes wrong
     */
    public void testMarkResetExceedReadAheadLimitOK_Internal()
            throws IOException {
        InputStream is = getStream(4*1024+17);
        is.mark(10);
        assertEquals(20, is.read(new byte[20]));
        // Note the following is implementation dependent.
        // Since the bytes are already stored in the internal buffer, we won't
        // fail the reset even though we have exceeded the read ahead limit.
        // With a different stream implementation, this may fail!

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     * @throws IOException if something goes wrong
     */
    public void testMarkResetExceedReadAheadLimitFail_Internal()
            throws IOException {
        InputStream is = getStream(64*1024+17);
        is.mark(10);
        // The internal buffer is 32 KB (implementation detail).
        int toRead = 38*1024+7;
        int read = 0;
        byte[] buf = new byte[toRead];
        while (read < toRead) {

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     * @throws IOException if something goes wrong
     */
    public void testMarkResetOverflowInternalBufferKeepBytes()
            throws IOException {
        InputStream is = getStream(128*1024);
        is.mark(120*1024);
        byte[] buf = new byte[120*1024-1];
        fillArray(is, buf);
        is.reset();
        checkBeginningOfStream(is);

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        is.reset();
        checkBeginningOfStream(is);


        // Again, but this time read past the read ahead limit.
        is = getStream(36*1024);
        is.mark(4*1024);
        buf = new byte[36*1024-1];
        fillArray(is, buf);
        try {
            is.reset();
            fail("reset-call was expected to throw IOException");

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     */
    public void testMarkReadUntilEOF()
            throws IOException {
        // Try with a single buffer fill first.
        InputStream is = getStream(4*1024);
        is.mark(8*1024);
        byte[] buf = new byte[8*1024];
        int read = 0;
        while (true) {
            int readNow = is.read(buf, read, buf.length - read);
            if (readNow == -1) {

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