Example usage for java.io DataInputStream read

Introduction

In this page you can find the example usage for java.io DataInputStream read.

Prototype

public final int read(byte b[], int off, int len) throws IOException 

Source Link

Document

Reads up to len bytes of data from the contained input stream into an array of bytes.

Usage

From source file:com.adaptris.security.StdOutput.java

private static byte[] read(DataInputStream in) throws IOException {
    byte[] bytes = new byte[in.readInt()];
    if (bytes.length > 0) {
        in.read(bytes, 0, bytes.length);
    } else {//ww  w  .j av a 2 s .c o  m
        bytes = null;
    }
    return bytes;
}

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From source file:FileUtil.java

public static byte[] readFileAsBytes(String path, Integer start, Integer length) {

    byte[] byteData = null;

    try {//w  w  w. ja  va  2  s  . co  m

        File file = new File(path);

        DataInputStream dis;
        dis = new DataInputStream(new FileInputStream(file));

        if (dis.available() > Integer.MAX_VALUE) {
            System.out.println("dis.available() > Integer.MAX_VALUE");
        }

        ByteArrayOutputStream os = new ByteArrayOutputStream(length);
        byte[] bytes = new byte[length];

        dis.skipBytes(start);
        int readBytes = dis.read(bytes, 0, length);
        os.write(bytes, 0, readBytes);

        byteData = os.toByteArray();

        dis.close();
        os.close();

    } catch (Exception e) {
        System.out.println(e);
    }

    return byteData;
}

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From source file:com.jrummyapps.busybox.signing.ZipSigner.java

/** Read a PKCS 8 format private key. */
private static PrivateKey readPrivateKey(InputStream file) throws IOException, GeneralSecurityException {
    final DataInputStream input = new DataInputStream(file);
    try {//www  .  ja  v  a  2s .c  o m
        byte[] bytes = new byte[10000];
        int nBytesTotal = 0, nBytes;
        while ((nBytes = input.read(bytes, nBytesTotal, 10000 - nBytesTotal)) != -1) {
            nBytesTotal += nBytes;
        }

        final byte[] bytes2 = new byte[nBytesTotal];
        System.arraycopy(bytes, 0, bytes2, 0, nBytesTotal);
        bytes = bytes2;

        KeySpec spec = decryptPrivateKey(bytes);
        if (spec == null) {
            spec = new PKCS8EncodedKeySpec(bytes);
        }

        try {
            return KeyFactory.getInstance("RSA").generatePrivate(spec);
        } catch (final InvalidKeySpecException ex) {
            return KeyFactory.getInstance("DSA").generatePrivate(spec);
        }
    } finally {
        input.close();
    }
}

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From source file:org.elasticsearch.discovery.custom.DataFetcher.java

public static String fetchData(String url, ESLogger logger) {
    DataInputStream responseStream = null;
    try {//from w  ww. j ava  2s  . c om
        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
        conn.setConnectTimeout(1000);
        conn.setReadTimeout(10000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() != 200)
            throw new RuntimeException("Unable to get data for URL " + url);

        byte[] b = new byte[2048];
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        responseStream = new DataInputStream((FilterInputStream) conn.getContent());
        int c = 0;
        while ((c = responseStream.read(b, 0, b.length)) != -1)
            bos.write(b, 0, c);
        String return_ = new String(bos.toByteArray(), CharEncoding.UTF_8);
        logger.info(String.format("Calling URL API: %s returns: %s", url, return_));
        conn.disconnect();
        return return_;
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    } finally {
        try {
            if (responseStream != null)
                responseStream.close();
        } catch (Exception e) {
            logger.warn("Failed to close response stream from priam", e);
        }
    }
}

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From source file:com.simiacryptus.util.Util.java

/**
 * Read byte [ ].//  w ww .ja v a 2 s  .  c  o m
 *
 * @param i the
 * @param s the s
 * @return the byte [ ]
 * @throws IOException the io exception
 */
@javax.annotation.Nonnull
public static byte[] read(@javax.annotation.Nonnull final DataInputStream i, final int s) throws IOException {
    @javax.annotation.Nonnull
    final byte[] b = new byte[s];
    int pos = 0;
    while (b.length > pos) {
        final int read = i.read(b, pos, b.length - pos);
        if (0 == read) {
            throw new RuntimeException();
        }
        pos += read;
    }
    return b;
}

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From source file:io.hops.hopsworks.common.jobs.yarn.LogReader.java

/**
 * Keep calling this till you get a {@link EOFException} for getting logs of
 * all types for a single container.//from   www.  ja  v  a2  s. c  o  m
 *
 * @param valueStream
 * @param out
 * @throws IOException
 */
public static void readAContainerLogsForALogType(DataInputStream valueStream, PrintStream out)
        throws IOException {

    byte[] buf = new byte[65535];

    String fileType = valueStream.readUTF();
    String fileLengthStr = valueStream.readUTF();
    long fileLength = Long.parseLong(fileLengthStr);
    out.print("LogType: ");
    out.println(fileType);
    out.print("LogLength: ");
    out.println(fileLengthStr);
    out.println("Log Contents:");

    long curRead = 0;
    long pendingRead = fileLength - curRead;
    int toRead = pendingRead > buf.length ? buf.length : (int) pendingRead;
    int len = valueStream.read(buf, 0, toRead);
    while (len != -1 && curRead < fileLength) {
        out.write(buf, 0, len);
        curRead += len;

        pendingRead = fileLength - curRead;
        toRead = pendingRead > buf.length ? buf.length : (int) pendingRead;
        len = valueStream.read(buf, 0, toRead);
    }
    out.println("");
}

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From source file:com.zotoh.core.io.StreamUte.java

/**
 * @param src/*from   w  w  w  . j  av  a 2 s.  com*/
 * @param out
 * @param bytesToCopy
 * @throws IOException
 */
@SuppressWarnings("unused")
public static void streamToStream(InputStream src, OutputStream out, long bytesToCopy) throws IOException {

    tstNonNegLongArg("bytes-to-read", bytesToCopy);
    tstObjArg("out-stream", out);
    tstObjArg("in-stream", src);

    DataInputStream dis = new DataInputStream(src);
    byte[] buff = new byte[4096];
    long cl = bytesToCopy;
    int bc = 0, c, tries = 0;

    while (cl > 0L) {
        c = dis.read(buff, 0, (int) Math.min(4096L, cl));
        if (c > 0) {
            bc += c;
            cl -= c;
            out.write(buff, 0, c);
        } else {
            // if we can't read all the bytes, then we dont want to loop forever, try 3 times, then come out
            if (tries == 3) {
                break;
            }
            safeThreadWait(500L);
            ++tries;
        }
    }

    safeFlush(out);
}

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From source file:org.structr.core.graph.SyncCommand.java

public static byte[] deserializeData(final DataInputStream inputStream) throws IOException {

    final int len = inputStream.readInt();
    final byte[] buffer = new byte[len];

    inputStream.read(buffer, 0, len);

    return buffer;
}

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From source file:com.bigdata.dastor.db.ReadResponse.java

public ReadResponse deserialize(DataInputStream dis) throws IOException {
    int digestSize = dis.readInt();
    byte[] digest = new byte[digestSize];
    dis.read(digest, 0, digestSize);
    boolean isDigest = dis.readBoolean();

    Row row = null;// w  ww.  ja v a2  s. c  o m
    if (!isDigest) {
        row = Row.serializer().deserialize(dis);
    }

    ReadResponse rmsg = isDigest ? new ReadResponse(digest) : new ReadResponse(row);
    rmsg.setIsDigestQuery(isDigest);
    return rmsg;
}

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From source file:org.mule.transformer.simple.ByteArrayToModbusResponse.java

public Object doTransform(Object src, String outputEncoding) throws TransformerException {
    try {/*from  w  w w . j  av a 2 s . c  o m*/
        BytesInputStream m_ByteIn = new BytesInputStream((byte[]) src);
        DataInputStream m_Input = new DataInputStream(m_ByteIn);
        byte[] buffer = m_ByteIn.getBuffer();

        //read to byte length of message
        if (m_Input.read(buffer, 0, 6) == -1) {
            throw new ModbusIOException("Premature end of stream (Header truncated).");
        }
        //extract length of bytes following in message
        int bf = ModbusUtil.registerToShort(buffer, 4);
        //read rest
        if (m_Input.read(buffer, 6, bf) == -1) {
            throw new ModbusIOException("Premature end of stream (Message truncated).");
        }
        m_ByteIn.reset(buffer, (6 + bf));
        m_ByteIn.skip(7);
        int functionCode = m_ByteIn.readUnsignedByte();
        m_ByteIn.reset();
        ModbusResponse res = ModbusResponse.createModbusResponse(functionCode);
        res.readFrom(m_ByteIn);

        return res;
    } catch (Exception e) {
        e.printStackTrace(System.out);
        return null;
    }

}

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