Examples with DataInputStream java.io.DataInputStream used on opensource projects

Example 51 with DataInputStream

use of java.io.DataInputStream in project guava by google.

the class LittleEndianDataOutputStreamTest method testWriteBytes_discardHighOrderBytes.

// testing a deprecated method
@SuppressWarnings("deprecation")
public void testWriteBytes_discardHighOrderBytes() throws IOException {
    /* Write out various test values in LITTLE ENDIAN FORMAT */
    out.writeBytes("ꪪꪻ꫌");
    byte[] data = baos.toByteArray();
    /* Setup input streams */
    DataInput in = new DataInputStream(new ByteArrayInputStream(data));
    /* Read in various values NORMALLY */
    byte[] b = new byte[3];
    in.readFully(b);
    byte[] expected = { (byte) 0xAA, (byte) 0xBB, (byte) 0xCC };
    assertEquals(expected, b);
}

Example 52 with DataInputStream

use of java.io.DataInputStream in project guava by google.

the class BloomFilter method readFrom.

/**
   * Reads a byte stream, which was written by {@linkplain #writeTo(OutputStream)}, into a
   * {@code BloomFilter<T>}.
   *
   * The {@code Funnel} to be used is not encoded in the stream, so it must be provided here.
   * <b>Warning:</b> the funnel provided <b>must</b> behave identically to the one used to populate
   * the original Bloom filter!
   *
   * @throws IOException if the InputStream throws an {@code IOException}, or if its data does not
   *     appear to be a BloomFilter serialized using the {@linkplain #writeTo(OutputStream)} method.
   */
public static <T> BloomFilter<T> readFrom(InputStream in, Funnel<? super T> funnel) throws IOException {
    checkNotNull(in, "InputStream");
    checkNotNull(funnel, "Funnel");
    int strategyOrdinal = -1;
    int numHashFunctions = -1;
    int dataLength = -1;
    try {
        DataInputStream din = new DataInputStream(in);
        // currently this assumes there is no negative ordinal; will have to be updated if we
        // add non-stateless strategies (for which we've reserved negative ordinals; see
        // Strategy.ordinal()).
        strategyOrdinal = din.readByte();
        numHashFunctions = UnsignedBytes.toInt(din.readByte());
        dataLength = din.readInt();
        Strategy strategy = BloomFilterStrategies.values()[strategyOrdinal];
        long[] data = new long[dataLength];
        for (int i = 0; i < data.length; i++) {
            data[i] = din.readLong();
        }
        return new BloomFilter<T>(new BitArray(data), numHashFunctions, funnel, strategy);
    } catch (RuntimeException e) {
        String message = "Unable to deserialize BloomFilter from InputStream." + " strategyOrdinal: " + strategyOrdinal + " numHashFunctions: " + numHashFunctions + " dataLength: " + dataLength;
        throw new IOException(message, e);
    }
}

Example 53 with DataInputStream

use of java.io.DataInputStream in project j2objc by google.

the class OldDataInputStreamTest method test_read$BII.

public void test_read$BII() throws IOException {
    byte[] rbytes = new byte[testLength - 5];
    Support_ASimpleInputStream sis = new Support_ASimpleInputStream();
    int r;
    os.write(fileString.getBytes());
    os.close();
    openDataInputStream();
    r = dis.read(rbytes, 1, testLength - 10);
    assertEquals("Test 1: Incorrect number of bytes read;", testLength - 10, r);
    assertEquals("Test 2: Incorrect data read.", 0, rbytes[0]);
    assertTrue("Test 3: Incorrect data written or read.", new String(rbytes, 1, r).equals(fileString.substring(0, r)));
    r = dis.read(rbytes, 0, 15);
    assertEquals("Test 3: Incorrect number of bytes read;", 10, r);
    assertTrue("Test 4: Incorrect data written or read.", new String(rbytes, 0, r).equals(fileString.substring(testLength - 10)));
    dis.close();
    sis.throwExceptionOnNextUse = true;
    dis = new DataInputStream(sis);
    try {
        dis.read(rbytes, 1, 5);
        fail("Test 5: IOException expected.");
    } catch (IOException e) {
    // Expected.
    }
}

Example 54 with DataInputStream

use of java.io.DataInputStream in project j2objc by google.

the class OldDataInputStreamTest method test_readFully$BII_Exception.

public void test_readFully$BII_Exception() throws IOException {
    DataInputStream is = new DataInputStream(new ByteArrayInputStream(new byte[testLength]));
    byte[] byteArray = new byte[testLength];
    try {
        is.readFully(byteArray, 0, -1);
        fail("Test 1: IndexOutOfBoundsException expected.");
    } catch (IndexOutOfBoundsException e) {
    // Expected.
    }
    try {
        is.readFully(byteArray, 0, byteArray.length + 1);
        fail("Test 2: IndexOutOfBoundsException expected.");
    } catch (IndexOutOfBoundsException e) {
    // Expected.
    }
    try {
        is.readFully(byteArray, 1, byteArray.length);
        fail("Test 3: IndexOutOfBoundsException expected.");
    } catch (IndexOutOfBoundsException e) {
    // Expected.
    }
    try {
        is.readFully(byteArray, -1, byteArray.length);
        fail("Test 4: IndexOutOfBoundsException expected.");
    } catch (IndexOutOfBoundsException e) {
    // Expected.
    }
    try {
        is.readFully(null, 0, 1);
        fail("Test 5: NullPointerException expected.");
    } catch (NullPointerException e) {
    // Expected.
    }
    is = new DataInputStream(null);
    try {
        is.readFully(byteArray, 0, 1);
        fail("Test 6: NullPointerException expected.");
    } catch (NullPointerException e) {
    // Expected.
    }
}

Example 55 with DataInputStream

use of java.io.DataInputStream in project j2objc by google.

the class DerInputStream method readVector.

/*
     * Read a "vector" of values ... set or sequence have the
     * same encoding, except for the initial tag, so both use
     * this same helper routine.
     */
protected DerValue[] readVector(int startLen, boolean originalEncodedFormRetained) throws IOException {
    DerInputStream newstr;
    byte lenByte = (byte) buffer.read();
    int len = getLength((lenByte & 0xff), buffer);
    if (len == -1) {
        // indefinite length encoding found
        int readLen = buffer.available();
        // for tag and length bytes
        int offset = 2;
        byte[] indefData = new byte[readLen + offset];
        indefData[0] = tag;
        indefData[1] = lenByte;
        DataInputStream dis = new DataInputStream(buffer);
        dis.readFully(indefData, offset, readLen);
        dis.close();
        DerIndefLenConverter derIn = new DerIndefLenConverter();
        buffer = new DerInputBuffer(derIn.convert(indefData));
        if (tag != buffer.read())
            throw new IOException("Indefinite length encoding" + " not supported");
        len = DerInputStream.getLength(buffer);
    }
    if (len == 0)
        // used only for missing optionals
        return new DerValue[0];
    /*
         * Create a temporary stream from which to read the data,
         * unless it's not really needed.
         */
    if (buffer.available() == len)
        newstr = this;
    else
        newstr = subStream(len, true);
    /*
         * Pull values out of the stream.
         */
    Vector<DerValue> vec = new Vector<DerValue>(startLen);
    DerValue value;
    do {
        value = new DerValue(newstr.buffer, originalEncodedFormRetained);
        vec.addElement(value);
    } while (newstr.available() > 0);
    if (newstr.available() != 0)
        throw new IOException("extra data at end of vector");
    /*
         * Now stick them into the array we're returning.
         */
    int i, max = vec.size();
    DerValue[] retval = new DerValue[max];
    for (i = 0; i < max; i++) retval[i] = vec.elementAt(i);
    return retval;
}