Example usage for org.apache.commons.io EndianUtils readSwappedInteger

Introduction

In this page you can find the example usage for org.apache.commons.io EndianUtils readSwappedInteger.

Prototype

public static int readSwappedInteger(byte[] data, int offset) 

Source Link

Document

Reads a "int" value from a byte array at a given offset.

Usage

From source file:com.github.bmadecoder.Authenticator.java

private static int selectInt(byte input[]) {
    int i = selectPos(input);
    byte[] subarray = ArrayUtils.subarray(input, i, i + 4);
    subarray[0] = (byte) (subarray[0] & 0x7f);
    int readSwappedInteger = EndianUtils.readSwappedInteger(subarray, 0);
    int result = EndianUtils.swapInteger(readSwappedInteger);
    return result;
}

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From source file:ch.threema.apitool.CryptTool.java

/**
 * Decrypt a message./*from  w ww.j a v  a  2  s . c  o  m*/
 *
 * @param box the box to be decrypted
 * @param recipientPrivateKey the private key of the receiving ID
 * @param senderPublicKey the public key of the sending ID
 * @param nonce the nonce that was used for the encryption
 * @return decrypted message (text or delivery receipt)
 */
public static ThreemaMessage decryptMessage(byte[] box, byte[] recipientPrivateKey, byte[] senderPublicKey,
        byte[] nonce) throws MessageParseException {

    byte[] data = decrypt(box, recipientPrivateKey, senderPublicKey, nonce);
    if (data == null)
        throw new DecryptionFailedException();

    /* remove padding */
    int padbytes = data[data.length - 1] & 0xFF;
    int realDataLength = data.length - padbytes;
    if (realDataLength < 1)
        throw new BadMessageException(); /* Bad message padding */

    /* first byte of data is type */
    int type = data[0] & 0xFF;

    switch (type) {
    case TextMessage.TYPE_CODE:
        /* Text message */
        if (realDataLength < 2)
            throw new BadMessageException();

        try {
            return new TextMessage(new String(data, 1, realDataLength - 1, "UTF-8"));
        } catch (UnsupportedEncodingException e) {
            /* should never happen, UTF-8 is always supported */
            throw new RuntimeException(e);
        }

    case DeliveryReceipt.TYPE_CODE:
        /* Delivery receipt */
        if (realDataLength < MessageId.MESSAGE_ID_LEN + 2
                || ((realDataLength - 2) % MessageId.MESSAGE_ID_LEN) != 0)
            throw new BadMessageException();

        DeliveryReceipt.Type receiptType = DeliveryReceipt.Type.get(data[1] & 0xFF);
        if (receiptType == null)
            throw new BadMessageException();

        List<MessageId> messageIds = new LinkedList<MessageId>();

        int numMsgIds = ((realDataLength - 2) / MessageId.MESSAGE_ID_LEN);
        for (int i = 0; i < numMsgIds; i++) {
            messageIds.add(new MessageId(data, 2 + i * MessageId.MESSAGE_ID_LEN));
        }

        return new DeliveryReceipt(receiptType, messageIds);

    case ImageMessage.TYPE_CODE:
        if (realDataLength != (1 + ThreemaMessage.BLOB_ID_LEN + 4 + NaCl.NONCEBYTES)) {
            System.out.println(String.valueOf(realDataLength));
            System.out.println(String.valueOf(1 + ThreemaMessage.BLOB_ID_LEN + 4 + NaCl.NONCEBYTES));
            throw new BadMessageException();
        }
        byte[] blobId = new byte[ThreemaMessage.BLOB_ID_LEN];
        System.arraycopy(data, 1, blobId, 0, ThreemaMessage.BLOB_ID_LEN);
        int size = EndianUtils.readSwappedInteger(data, 1 + ThreemaMessage.BLOB_ID_LEN);
        byte[] fileNonce = new byte[NaCl.NONCEBYTES];
        System.arraycopy(data, 1 + 4 + ThreemaMessage.BLOB_ID_LEN, fileNonce, 0, nonce.length);

        return new ImageMessage(blobId, size, fileNonce);

    case FileMessage.TYPE_CODE:
        try {
            return FileMessage.fromString(new String(data, 1, realDataLength - 1, "UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new BadMessageException();
        }

    default:
        throw new UnsupportedMessageTypeException();
    }
}

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From source file:io.github.dsheirer.source.tuner.hackrf.HackRFTunerController.java

public int read(Request request, int value, int index, int length) throws UsbException {
    if (!(length == 1 || length == 2 || length == 4)) {
        throw new IllegalArgumentException(
                "invalid length [" + length + "] must be: byte=1, short=2, int=4 to read a primitive");
    }//from   www  . j  a  v a  2  s. c o m

    ByteBuffer buffer = readArray(request, value, index, length);

    byte[] data = new byte[buffer.capacity()];

    buffer.get(data);

    switch (data.length) {
    case 1:
        return data[0];
    case 2:
        return EndianUtils.readSwappedShort(data, 0);
    case 4:
        return EndianUtils.readSwappedInteger(data, 0);
    default:
        throw new UsbException(
                "read() primitive returned an " + "unrecognized byte array " + Arrays.toString(data));
    }
}

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