Example usage for java.math BigInteger shiftLeft

List of usage examples for java.math BigInteger shiftLeft

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Introduction

In this page you can find the example usage for java.math BigInteger shiftLeft.

Prototype

public BigInteger shiftLeft(int n)

Source Link

Document

Returns a BigInteger whose value is (this << n) .

Usage

From source file:net.ripe.rpki.commons.crypto.util.Asn1Util.java

/**
 * IPAddress ::= BIT STRING/*from  w w w . java  2s.  c o  m*/
 */
public static IpAddress parseIpAddress(IpResourceType type, ASN1Encodable der, boolean padWithOnes) {
    expect(der, DERBitString.class);
    DERBitString derBitString = (DERBitString) der;

    byte[] bytes = derBitString.getBytes();
    BigInteger value = new BigInteger(1, bytes);
    int usedBits = bytes.length * Byte.SIZE;
    int neededBits = type.getBitSize();
    int padBits = derBitString.getPadBits();

    if (padBits > 0) {
        byte lastByte = bytes[bytes.length - 1];
        byte mask = (byte) ((1 << padBits) - 1);
        Validate.isTrue((lastByte & mask) == 0, "pad bits not zero");
    }

    BigInteger upperBits = value.shiftLeft(neededBits - usedBits);
    BigInteger lowerBits = BigInteger.ZERO;
    if (padWithOnes) {
        lowerBits = BigInteger.ONE.shiftLeft(neededBits - usedBits + padBits).subtract(BigInteger.ONE);
    }

    return (IpAddress) type.fromBigInteger(upperBits.or(lowerBits));
}

From source file:Util.java

public static BigInteger bitwiseGcd(BigInteger u, BigInteger v) {
    if (u.equals(BigInteger.ZERO))
        return v;
    if (v.equals(BigInteger.ZERO))
        return u;

    //      System.out.format("u=%s=%s\nu.getLowestSetBit()=%s\n%s>>%s=%s = %s\n", u, u.toString(2), u.getLowestSetBit(), u, u.getLowestSetBit(), u.shiftRight(u.getLowestSetBit()), u.shiftRight(u.getLowestSetBit()).toString(2));

    int uBit = u.getLowestSetBit();
    int vBit = v.getLowestSetBit();
    int k = (uBit <= vBit ? uBit : vBit);

    while (u.signum() > 0) {
        // first ensure that both are odd
        u = u.shiftRight(u.getLowestSetBit());
        v = v.shiftRight(v.getLowestSetBit());
        if (u.subtract(v).signum() >= 0) {
            u = (u.subtract(v)).shiftRight(1);
        } else {//  w  w w  .j a  va 2s.  c o  m
            v = (v.subtract(u)).shiftRight(1);
        }
    }

    return v.shiftLeft(k);
}

From source file:com.wms.utils.DataUtil.java

public static BigInteger ipv4ToNumber(String ipAddress) {
    BigInteger result = BigInteger.valueOf(0);
    String[] atoms = ipAddress.split("\\.");

    for (int i = 3; i >= 0; i--) {
        BigInteger bi = new BigInteger(atoms[3 - i]);
        result = result.shiftLeft(8).add(bi);
    }/*from w ww  .  j  a  va 2 s . c  o  m*/

    return result;
}

From source file:com.wms.utils.DataUtil.java

public static BigInteger ipv6ToNumber(String addr) {
    int startIndex = addr.indexOf("::");

    if (startIndex != -1) {

        String firstStr = addr.substring(0, startIndex);
        String secondStr = addr.substring(startIndex + 2, addr.length());

        BigInteger first = ipv6ToNumber(firstStr);

        int x = countChar(addr, ':');
        int y = countChar(secondStr, ':');
        //first = first.shiftLeft(16 * (7 - x)).add(ipv6ToNumber(secondStr));
        first = first.shiftLeft(16 * (7 - x + y));
        first = first.add(ipv6ToNumber(secondStr));

        return first;
    }//from w w  w  .jav  a  2  s  . c o m

    String[] strArr = addr.split(":");

    BigInteger retValue = BigInteger.valueOf(0);
    for (int i = 0; i < strArr.length; i++) {
        BigInteger bi = new BigInteger(strArr[i], 16);
        retValue = retValue.shiftLeft(16).add(bi);
    }
    return retValue;
}

From source file:org.rifidi.edge.readerplugin.awid.awid2010.communication.messages.Gen2ReadBlockDataResponse.java

@Override
public TagReadEvent getTagReadEvent() {
    EPCGeneration2Event gen2Event = new EPCGeneration2Event();
    byte[] shiftedmessage = new byte[super.rawmessage.length];
    BigInteger bi = new BigInteger(super.rawmessage);
    BigInteger bi2 = bi.shiftLeft(1);

    shiftedmessage = bi2.toByteArray();//from   w w  w . ja  va 2 s. c o  m
    if (memorybank == 0) {
        logger.debug("Reserved Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: put bytes in reserved mem bank
    } else if (memorybank == 1) {
        logger.debug("EPC Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: what if we don't have 96 bits?
        gen2Event.setEPCMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 7, 19)), 12 * 8);
    } else if (memorybank == 2) {
        logger.debug("TID Memory Bank " + new String(Hex.encodeHex(shiftedmessage)));

        // TODO: this is not quite correct since it assumes that we have 96
        // bits
        gen2Event.setTIDMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 3, 17)), 12 * 8);
    } else if (memorybank == 3) {
        logger.debug("User Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        // TODO: insert into user memory
    }

    TagReadEvent tre;
    if (super.rawmessage.length == 22) {
        logger.debug("AntennaID " + super.rawmessage[19]);
        tre = new TagReadEvent(readerID, gen2Event, super.rawmessage[19], timestamp);
    } else {
        logger.warn("No Antenna byte, assuming default value of " + 1);
        tre = new TagReadEvent(readerID, gen2Event, 1, timestamp);
    }
    return tre;
}

From source file:org.rifidi.edge.adapter.awid.awid2010.communication.messages.Gen2ReadBlockDataResponse.java

@Override
public TagReadEvent getTagReadEvent() {
    EPCGeneration2Event gen2Event = new EPCGeneration2Event();
    byte[] shiftedmessage = new byte[super.rawmessage.length];
    BigInteger bi = new BigInteger(super.rawmessage);
    BigInteger bi2 = bi.shiftLeft(1);

    shiftedmessage = bi2.toByteArray();// w  ww  .  jav  a2s  .c  o m
    if (memorybank == 0) {
        logger.debug("Reserved Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: put bytes in reserved mem bank
    } else if (memorybank == 1) {
        logger.debug("EPC Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: what if we don't have 96 bits?
        BigInteger epc = new BigInteger(Arrays.copyOfRange(shiftedmessage, 7, 19));
        gen2Event.setEPCMemory(epc, epc.toString(16), 12 * 8);
    } else if (memorybank == 2) {
        logger.debug("TID Memory Bank " + new String(Hex.encodeHex(shiftedmessage)));

        // TODO: this is not quite correct since it assumes that we have 96
        // bits
        gen2Event.setTIDMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 3, 17)), 12 * 8);
    } else if (memorybank == 3) {
        logger.debug("User Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        // TODO: insert into user memory
    }

    TagReadEvent tre;
    if (super.rawmessage.length == 22) {
        logger.debug("AntennaID " + super.rawmessage[19]);
        tre = new TagReadEvent(readerID, gen2Event, super.rawmessage[19], timestamp);
    } else {
        logger.warn("No Antenna byte, assuming default value of " + 1);
        tre = new TagReadEvent(readerID, gen2Event, 1, timestamp);
    }
    return tre;
}

From source file:UInt64.java

/**
 * Create a UInt64 from two longs.//from   w ww  .j ava2  s  .  c  o m
 * 
 * @param top
 *          Most significant 4 bytes.
 * @param bottom
 *          Least significant 4 bytes.
 */
public UInt64(long top, long bottom) {
    BigInteger a = new BigInteger("" + top);
    a = a.shiftLeft(32);
    a = a.add(new BigInteger("" + bottom));
    // if (0 > a.compareTo(BigInteger.ZERO)) { throw new NumberFormatException(MessageFormat.format(
    //    _("{0} is not between {1} and {2}."), new Object[] { a, MIN_VALUE, MAX_BIG_VALUE })); }
    //if (0 < a.compareTo(MAX_BIG_VALUE)) { throw new NumberFormatException(MessageFormat.format(
    //   _("{0} is not between {1} and {2}."), new Object[] { a, MIN_VALUE, MAX_BIG_VALUE })); }
    value = a;
    this.top = top;
    this.bottom = bottom;
}

From source file:com.buildabrand.gsb.util.URLUtils.java

private String convertIpAddress(String ipAddr) {
    String[] ipAddrSplit = StringUtils.split(ipAddr, '.');

    if (ipAddrSplit.length == 0 || ipAddrSplit.length > 4) {
        return null;
    }//  www  .  j a  va  2s .c  o m

    // Basically we should parse octal if we can, but if there are illegal octal
    // numbers, i.e. 08 or 09, then we should just look at decimal and hex.
    boolean allowOctal = !FIND_BAD_OCTAL_REGEXP.matcher(ipAddr).find();

    BigInteger ipNumeric = BigInteger.ZERO;
    int i = 0;
    while (i < ipAddrSplit.length - 1) {
        ipNumeric = ipNumeric.shiftLeft(8);
        BigInteger componentBigInt = convertComponent(ipAddrSplit[i], allowOctal);
        if (componentBigInt == null) {
            return null;
        }

        ipNumeric = ipNumeric.add(componentBigInt);
        i++;
    }
    while (i < 4) {
        ipNumeric = ipNumeric.shiftLeft(8);
        i++;
    }
    BigInteger componentBigInt = convertComponent(ipAddrSplit[ipAddrSplit.length - 1], allowOctal);
    if (componentBigInt == null) {
        return null;
    }
    ipNumeric = ipNumeric.add(componentBigInt);

    return InetAddresses.fromInteger((ipNumeric.intValue())).getHostAddress();
}

From source file:Bytes.java

public BigInteger convertFrom(BigInteger originalAmount, Bytes originalType) {
    /**//from w w  w .j  a  va 2  s  . co  m
     * So, B.convertFrom(BigInteger.ONE, YB)
     * should be used to convert 1 yottabyte to bytes...
     */

    BigInteger currentAmount = originalAmount;
    int convertTo = ordinal();
    int convertFrom = originalType.ordinal();
    while (convertTo != convertFrom) {
        if (convertTo < convertFrom) {
            currentAmount = currentAmount.shiftLeft(10);
            convertFrom--;
        } else {
            currentAmount = currentAmount.shiftRight(10);
            convertFrom++;
        }
    }
    return currentAmount;
}

From source file:de.decoit.visa.net.IPAddress.java

/**
 * Return a {@link java.math.BigInteger BigInteger} object containing the
 * bit mask of this address./*  w ww . j  a  v  a2 s .c  o  m*/
 *
 * @return Bit mask of this address
 */
BigInteger toBigIntBitmask() {
    BigInteger rv = BigInteger.ZERO;

    for (int i = 0; i < ipAddressGroups.length; i++) {
        rv = rv.add(BigInteger.valueOf(ipAddressGroups[i]));

        if (i < ipAddressGroups.length - 1) {
            rv = rv.shiftLeft(ipVersion.getSegmentBitCount());
        }
    }

    return rv;
}