Exemple #1
0
  public static void testCorrectness() {
    // Test behavior
    System.out.println("Correctness test");

    for (int ii = 1; ii < 20; ii++) {
      System.out.println("\n\nTest " + ii);
      try {
        byte[] values;
        int size = 0;
        java.util.Random random = new java.util.Random();

        if (ii == 3)
          values = new byte[] {0, 0, 32, 15, -4, 16, 0, 16, 0, 7, -1, -4, -32, 0, 31, -1};
        else if (ii == 2)
          values =
              new byte[] {
                0x3d, 0x4d, 0x54, 0x47, 0x5a, 0x36, 0x39, 0x26, 0x72, 0x6f, 0x6c, 0x65, 0x3d, 0x70,
                0x72, 0x65
              };
        else if (ii == 4)
          values =
              new byte[] {
                65, 71, 74, 66, 76, 65, 69, 77, 74, 79, 68, 75, 73, 72, 77, 68, 78, 65, 79, 79, 78,
                66, 77, 71, 64, 70, 74, 77, 64, 67, 71, 64
              };
        else if (ii == 1) {
          FileInputStream fis = new FileInputStream("e:\\temp\\book1");
          byte[] buf = new byte[1024 * 1024];
          int r = fis.read(buf);
          values = new byte[r];
          System.arraycopy(buf, 0, values, 0, r);
          fis.close();
          //                     values = new byte[32];
          //
          //                     for (int i=0; i<values.length; i++)
          //                          values[i] = 2; // all identical
          //
          //                     values="mississippi".getBytes();
        } else if (ii == 5) {
          values = new byte[32];

          for (int i = 0; i < values.length; i++) values[i] = (byte) (2 + (i & 1)); // 2 symbols
        } else {
          values = new byte[32];

          for (int i = 0; i < values.length; i++) values[i] = (byte) (random.nextInt() & 31);
        }

        if (size == 0) size = values.length;

        System.out.println("Original:");

        for (int i = 0; i < size; i++) System.out.print(values[i] + " ");

        System.out.println("\nEncoded:");
        ByteArrayOutputStream os = new ByteArrayOutputStream(16384);
        OutputBitStream bs = new DefaultOutputBitStream(os, 16384);
        DebugOutputBitStream dbgbs = new DebugOutputBitStream(bs, System.out);
        dbgbs.showByte(true);
        dbgbs.setMark(true);

        ANSRangeEncoder rc = new ANSRangeEncoder(dbgbs);
        rc.encode(values, 0, size);

        rc.dispose();
        dbgbs.close();
        System.out.println();
        byte[] buf = os.toByteArray();
        InputBitStream bs2 = new DefaultInputBitStream(new ByteArrayInputStream(buf), 16384);
        DebugInputBitStream dbgbs2 = new DebugInputBitStream(bs2, System.out);
        dbgbs2.setMark(true);
        ANSRangeDecoder rd = new ANSRangeDecoder(dbgbs2);
        ;
        System.out.println("\nDecoded:");
        boolean ok = true;
        byte[] values2 = new byte[size];
        rd.decode(values2, 0, size);
        System.out.println("");

        for (int i = 0; i < size; i++) System.out.print(values2[i] + " ");

        for (int j = 0; j < size; j++) {
          if (values2[j] != values[j]) {
            ok = false;
            break;
          }
        }

        System.out.println();
        System.out.println("\n" + ((ok == true) ? "Identical" : "! *** Different *** !"));
        rd.dispose();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
Exemple #2
0
  public static void testSpeed() {
    // Test speed
    System.out.println("\n\nSpeed Test");
    int[] repeats = {3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3};
    final int iter = 4000;
    final int size = 50000;

    for (int jj = 0; jj < 3; jj++) {
      long ww = 0;
      System.out.println("\nTest " + (jj + 1));
      byte[] values1 = new byte[size];
      byte[] values2 = new byte[size];
      long delta1 = 0, delta2 = 0;
      Random rnd = new Random();

      for (int ii = 0; ii < iter; ii++) {
        int idx = 0;

        for (int i = 0; i < values1.length; i++) {
          int i0 = i;
          int len = repeats[idx];
          idx = (idx + 1) & 0x0F;

          if (i0 + len >= values1.length) len = 1;

          final byte b = (byte) rnd.nextInt();

          for (int j = i0; j < i0 + len; j++) {
            values1[j] = b;
            i++;
          }
        }

        // Encode
        ByteArrayOutputStream os = new ByteArrayOutputStream(size * 2);
        OutputBitStream bs = new DefaultOutputBitStream(os, size);
        ANSRangeEncoder rc = new ANSRangeEncoder(bs);
        long before1 = System.nanoTime();

        if (rc.encode(values1, 0, values1.length) < 0) {
          System.out.println("Encoding error");
          System.exit(1);
        }

        long after1 = System.nanoTime();
        delta1 += (after1 - before1);
        rc.dispose();
        bs.close();
        ww += bs.written();

        // Decode
        byte[] buf = os.toByteArray();
        InputBitStream bs2 = new DefaultInputBitStream(new ByteArrayInputStream(buf), size);
        ANSRangeDecoder rd = new ANSRangeDecoder(bs2);
        long before2 = System.nanoTime();

        if (rd.decode(values2, 0, values2.length) < 0) {
          System.out.println("Decoding error");
          System.exit(1);
        }

        long after2 = System.nanoTime();
        delta2 += (after2 - before2);
        rd.dispose();

        // Sanity check
        for (int i = 0; i < values1.length; i++) {
          if (values1[i] != values2[i]) {
            System.out.println(
                "Error at index " + i + " (" + values1[i] + "<->" + values2[i] + ")");
            break;
          }
        }
      }

      final long prod = (long) iter * (long) size;

      System.out.println("Encode [ms]       : " + delta1 / 1000000);
      System.out.println("Throughput [KB/s] : " + prod * 1000000L / delta1 * 1000L / 1024L);
      System.out.println("Decode [ms]       : " + delta2 / 1000000);
      System.out.println("Throughput [KB/s] : " + prod * 1000000L / delta2 * 1000L / 1024L);
    }
  }