Examples with BitReader uk.me.parabola.imgfmt.app.BitReader used on opensource projects

Example 1 with BitReader

use of uk.me.parabola.imgfmt.app.BitReader in project mkgmap by openstreetmap.

the class RGNFileReader method readLineCommonExtType.

/**
 * Common code to read extended type lines or polygons for a given sub division.
 * @param reader The reader for the img file.
 * @param div The subdivision.
 * @param line The line or shape that is to be populated.
 */
private void readLineCommonExtType(ImgFileReader reader, Subdivision div, Polyline line) {
    int type = reader.get();
    type = (type & 0xff) << 8;
    byte b1 = reader.get();
    boolean hasExtraBytes = (b1 & 0x80) != 0;
    boolean hasLabel = (b1 & 0x20) != 0;
    type |= 0x10000 + (b1 & 0x1f);
    line.setType(type);
    line.setDeltaLong((short) reader.getChar());
    line.setDeltaLat((short) reader.getChar());
    b1 = reader.get();
    int len;
    // one byte or two byte length field?
    if ((b1 & 0x01) != 0) {
        len = (b1 >> 1) & 0x7f;
        assert len < 0x7f;
    } else {
        byte b2 = reader.get();
        len = (((b2 & 0xff) << 8) + (b1 & 0xff)) >> 2;
        assert len >= 0x7f;
    }
    // the encoded value includes the base field
    --len;
    assert len > 0;
    int base = reader.get();
    byte[] bitstream = reader.get(len);
    BitReader br = new BitReader(bitstream);
    // This reads the bit stream and adds all the points found,
    readBitStream(br, div, line, false, len, base);
    if (hasLabel) {
        int labelOffset = reader.getu3();
        Label label;
        if ((labelOffset & 0x800000) == 0) {
            label = lblFile.fetchLabel(labelOffset & 0x7fffff);
        } else {
            int netoff = labelOffset & 0x3fffff;
            labelOffset = netFile.getLabelOffset(netoff);
            label = lblFile.fetchLabel(labelOffset);
            RoadDef roadDef = new RoadDef(0, netoff, label.getText());
            line.setRoadDef(roadDef);
        }
        line.setLabel(label);
    }
    if (hasExtraBytes) {
        extractExtraBytes(reader, line);
    }
}

Example 2 with BitReader

use of uk.me.parabola.imgfmt.app.BitReader in project mkgmap by openstreetmap.

the class NumberPreparerTest method testKnownStream.

/**
 * Just test that the test infrastructure is working with a known byte stream, this
 * is testing the tests.
 */
@Test
public void testKnownStream() {
    byte[] buf = { 0x41, 0x13, 0x27, 0x49, 0x60 };
    BitReader br = new BitReader(buf);
    NumberReader nr = new NumberReader(br);
    nr.setNumberOfNodes(1);
    List<Numbers> numbers = nr.readNumbers(true);
    assertEquals(1, numbers.size());
    assertEquals("0,E,24,8,O,23,13", numbers.get(0).toString());
}

Example 3 with BitReader

use of uk.me.parabola.imgfmt.app.BitReader in project mkgmap by openstreetmap.

the class NumberPreparerTest method writeAndRead.

private List<Numbers> writeAndRead(List<Numbers> numbers) {
    NumberPreparer preparer = new NumberPreparer(numbers);
    BitWriter bw = preparer.fetchBitStream();
    bytesUsed += bw.getLength();
    assertTrue("check valid flag", preparer.isValid());
    boolean swapped = preparer.getSwapped();
    // Now read it all back in again
    byte[] b1 = bw.getBytes();
    byte[] bytes = new byte[bw.getLength()];
    System.arraycopy(b1, 0, bytes, 0, bw.getLength());
    BitReader br = new BitReader(bytes);
    NumberReader nr = new NumberReader(br);
    nr.setNumberOfNodes(numbers.get(numbers.size() - 1).getIndex() + 1);
    List<Numbers> list = nr.readNumbers(swapped);
    for (Numbers n : list) n.setNodeNumber(n.getIndex());
    return list;
}

Example 4 with BitReader

use of uk.me.parabola.imgfmt.app.BitReader in project mkgmap by openstreetmap.

the class NumberRangeTest method run.

private void run(String[] strings) {
    List<Numbers> numbers = new ArrayList<Numbers>();
    for (String s : strings) {
        Numbers n = new Numbers(s);
        n.setIndex(n.getNodeNumber());
        numbers.add(n);
    }
    NumberPreparer np = new NumberPreparer(numbers);
    BitWriter bitWriter = np.fetchBitStream();
    bytesUsed += bitWriter.getLength();
    // Now read it back in
    byte[] bytes = new byte[bitWriter.getLength()];
    System.arraycopy(bitWriter.getBytes(), 0, bytes, 0, bytes.length);
    NumberReader nr = new NumberReader(new BitReader(bytes));
    nr.setNumberOfNodes(numbers.get(numbers.size() - 1).getIndex() + 1);
    List<Numbers> list = nr.readNumbers(np.getSwapped());
    // Have to fix up the node numbers
    for (Numbers n : list) {
        n.setNodeNumber(n.getIndex());
    }
    // Test that they are the same.
    String orig = numbers.toString();
    String calculated = list.toString();
    if (!orig.equals(calculated)) {
        System.out.printf("Fail: expecting: %s\n            Got: %s\n", orig, calculated);
    }
}

Example 5 with BitReader

use of uk.me.parabola.imgfmt.app.BitReader in project mkgmap by openstreetmap.

the class RGNFileReader method readLineCommon.

/**
 * Since polygons are pretty much like polylines in the img format the
 * reading code can be shared.
 *
 * @param reader The reader for the img file.
 * @param div The subdivision.
 * @param line The line or shape that is to be populated.
 */
private void readLineCommon(ImgFileReader reader, Subdivision div, Polyline line) {
    byte type = reader.get();
    if (line instanceof Polygon)
        line.setType(type & 0x7f);
    else {
        line.setType(type & 0x3f);
        line.setDirection((type & 0x40) != 0);
    }
    int labelOffset = reader.getu3();
    // Extra bit (for bit stream)
    boolean extra = (labelOffset & 0x400000) != 0;
    Label label;
    if ((labelOffset & 0x800000) == 0) {
        label = lblFile.fetchLabel(labelOffset & 0x7fffff);
    } else {
        int netoff = labelOffset & 0x3fffff;
        labelOffset = netFile.getLabelOffset(netoff);
        label = lblFile.fetchLabel(labelOffset);
        RoadDef roadDef = new RoadDef(0, netoff, label.getText());
        line.setRoadDef(roadDef);
    }
    line.setLabel(label);
    line.setDeltaLong((short) reader.getChar());
    line.setDeltaLat((short) reader.getChar());
    int len;
    if ((type & 0x80) == 0)
        len = reader.get() & 0xff;
    else
        len = reader.getChar();
    int base = reader.get();
    byte[] bitstream = reader.get(len);
    BitReader br = new BitReader(bitstream);
    // This reads the bit stream and adds all the points found
    readBitStream(br, div, line, extra, len, base);
}