Example usage for java.io DataOutput writeByte

Introduction

In this page you can find the example usage for java.io DataOutput writeByte.

Prototype

void writeByte(int v) throws IOException;

Source Link

Document

Writes to the output stream the eight low- order bits of the argument v.

Usage

From source file:Main.java

public static void writeBooleanArray(DataOutput out, boolean[] v) throws IOException {
    for (int chunk = 0; chunk < v.length; chunk += 8) {
        byte encoding = 0;
        for (int i = chunk; i < v.length && i < chunk + 8; i++) {
            encoding <<= 1;//w  w  w. j  a v  a2 s .co  m
            encoding += v[i] ? 1 : 0;
        }
        out.writeByte(encoding);
    }
}

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From source file:com.aliyun.odps.io.TupleReaderWriter.java

/**
 * Tuple??/* w w w .  jav  a  2  s . c  o m*/
 *
 * @param out
 *     Tuple??
 * @param t
 *     Tuple
 * @throws IOException
 *     ?Tuple?field
 */
public static void writeTuple(DataOutput out, Tuple t) throws IOException {
    out.writeByte(TUPLE);
    int sz = t.size();
    out.writeInt(sz);
    for (int i = 0; i < sz; i++) {
        writeDatum(out, t.get(i));
    }
}

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From source file:com.icloud.framework.core.util.FBUtilities.java

public static void writeShortByteArray(ByteBuffer name, DataOutput out) {
    int length = name.remaining();
    assert 0 <= length && length <= MAX_UNSIGNED_SHORT;
    try {//w w w .j a v  a  2s  .  co  m
        out.writeByte((length >> 8) & 0xFF);
        out.writeByte(length & 0xFF);
        out.write(name.array(), name.position() + name.arrayOffset(), name.remaining());
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

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From source file:Main.java

public static void writeBooleanArray(DataOutput out, boolean[] v, boolean extra) throws IOException {
    int len = v.length + 1;
    for (int chunk = 0; chunk < len; chunk += 8) {
        byte encoding = 0;
        for (int i = chunk; i < len && i < chunk + 8; i++) {
            encoding <<= 1;/*from w w  w  .j a v  a2 s . co  m*/
            if (i == v.length) {
                encoding += extra ? 1 : 0; //v[len] is the extra piece
            } else {
                encoding += v[i] ? 1 : 0;
            }
        }
        out.writeByte(encoding);
    }
}

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From source file:hivemall.fm.FFMPredictionModel.java

private static void writeEntry(@Nonnull final Entry e, final int factors, @Nonnull final float[] Vf,
        @Nonnull final DataOutput out) throws IOException {
    final float W = e.getW();
    e.getV(Vf);/*from  w  ww.  j  av  a 2  s .  co  m*/

    if (ArrayUtils.almostEquals(Vf, 0.f)) {
        if (HalfFloat.isRepresentable(W)) {
            out.writeByte(W_ONLY_HALF_FLOAT_ENTRY);
            out.writeShort(HalfFloat.floatToHalfFloat(W));
        } else {
            out.writeByte(W_ONLY_FLOAT_ENTRY);
            out.writeFloat(W);
        }
    } else if (isRepresentableAsHalfFloat(W, Vf)) {
        out.writeByte(HALF_FLOAT_ENTRY);
        out.writeShort(HalfFloat.floatToHalfFloat(W));
        for (int i = 0; i < factors; i++) {
            out.writeShort(HalfFloat.floatToHalfFloat(Vf[i]));
        }
    } else {
        out.writeByte(FLOAT_ENTRY);
        out.writeFloat(W);
        IOUtils.writeFloats(Vf, factors, out);
    }
}

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From source file:com.buaa.cfs.io.UTF8.java

private static void writeChars(DataOutput out, String s, int start, int length) throws IOException {
    final int end = start + length;
    for (int i = start; i < end; i++) {
        int code = s.charAt(i);
        if (code <= 0x7F) {
            out.writeByte((byte) code);
        } else if (code <= 0x07FF) {
            out.writeByte((byte) (0xC0 | ((code >> 6) & 0x1F)));
            out.writeByte((byte) (0x80 | code & 0x3F));
        } else {/*  ww  w.j a  v  a  2s .co m*/
            out.writeByte((byte) (0xE0 | ((code >> 12) & 0X0F)));
            out.writeByte((byte) (0x80 | ((code >> 6) & 0x3F)));
            out.writeByte((byte) (0x80 | (code & 0x3F)));
        }
    }
}

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From source file:com.aliyun.odps.io.TupleReaderWriter.java

private static void writeDatum(DataOutput out, Writable val) throws IOException {
    // Read the data type
    byte type = findType(val);
    switch (type) {
    case TUPLE://from www.ja  va 2s. c o m
        Tuple t = (Tuple) val;
        out.writeByte(TUPLE);
        int sz = t.size();
        out.writeInt(sz);
        for (int i = 0; i < sz; i++) {
            writeDatum(out, t.get(i));
        }
        break;

    case NULL:
        out.writeByte(NULL);
        break;

    case INTWRITABLE:
        out.writeByte(INTWRITABLE);
        ((IntWritable) val).write(out);
        break;

    case LONGWRITABLE:
        out.writeByte(LONGWRITABLE);
        ((LongWritable) val).write(out);
        break;

    case DATETIMEWRITABLE:
        out.writeByte(DATETIMEWRITABLE);
        ((DatetimeWritable) val).write(out);
        break;

    case DOUBLEWRITABLE:
        out.writeByte(DOUBLEWRITABLE);
        ((DoubleWritable) val).write(out);
        break;

    case BOOLEANWRITABLE:
        out.writeByte(BOOLEANWRITABLE);
        ((BooleanWritable) val).write(out);
        break;

    case BYTESWRITABLE:
        out.writeByte(BYTESWRITABLE);
        ((BytesWritable) val).write(out);
        break;

    case TEXT:
        out.writeByte(TEXT);
        ((Text) val).write(out);
        break;

    case NULLWRITABLE:
        out.writeByte(NULLWRITABLE);
        ((NullWritable) val).write(out);
        break;

    case UNKNOWN:
        out.writeByte(UNKNOWN);
        out.writeUTF(val.getClass().getName());
        val.write(out);
        break;

    default:
        throw new RuntimeException("Unexpected data type " + type + " found in stream.");
    }
}

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From source file:com.ibm.jaql.util.BaseUtil.java

/**
 * //from w  w w  . ja  va 2  s.c om
 * 0x00, 8 byte neg 0x01, 7 byte neg ... 0x07 1 byte neg 0x08 -120 0x09 -119
 * ... 0x80 0 ... 0xf6 118 0xf7 119 0xf8 1 byte pos ... 0xfe 7 byte pos 0xff 8
 * byte pos
 */
public static void writeVSLong(DataOutput out, long v) throws IOException {
    int flip;
    if (v >= -120) {
        if (v <= 119) {
            out.writeByte((byte) (v + 0x80));
            return;
        }
        // v >= 120
        flip = 0x00;
    } else
    // v <= -121
    {
        v = ~v; // take one's complement of negative numbers 
        flip = 0xff;
    }

    // 120 <= v <= maxLong
    v -= 120;
    int len = 1;
    long t = v >> 8;
    while (t > 0) {
        t >>= 8;
        len++;
    }

    out.writeByte((byte) ((0xf7 + len) ^ flip));

    do {
        len--;
        out.writeByte((byte) ((v >> (len << 3)) ^ flip));
    } while (len > 0);
}

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From source file:CompressedNumber.java

/**
 * Write a compressed integer only supporting signed values. Formats are (with
 * x representing value bits):/*ww w. j  a v  a2s. co m*/
 * 
 * <PRE>
 * 
 * 1 Byte - 00xxxxxx Represents the value <= 63 (0x3f) 2 Byte - 01xxxxxx
 * xxxxxxxx Represents the value > 63 && <= 16383 (0x3fff) 4 byte - 1xxxxxxx
 * xxxxxxxx xxxxxxxx xxxxxxxx Represents the value > 16383 && <= MAX_INT
 * 
 * </PRE>
 * 
 * 
 * @exception IOException
 *              value is negative or an exception was thrown by a method on
 *              out.
 */
public static final int writeInt(DataOutput out, int value) throws IOException {

    if (value < 0)
        throw new IOException();

    if (value <= 0x3f) {

        out.writeByte(value);
        return 1;
    }

    if (value <= 0x3fff) {

        out.writeByte(0x40 | (value >>> 8));
        out.writeByte(value & 0xff);
        return 2;
    }

    out.writeByte(((value >>> 24) | 0x80) & 0xff);
    out.writeByte((value >>> 16) & 0xff);
    out.writeByte((value >>> 8) & 0xff);
    out.writeByte((value) & 0xff);
    return 4;
}

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From source file:CompressedNumber.java

/**
 * Write a compressed long only supporting signed values.
 * // ww  w  . j a  v a2s.  c o m
 * Formats are (with x representing value bits):
 * 
 * <PRE>
 * 
 * 2 byte - 00xxxxxx xxxxxxxx Represents the value <= 16383 (0x3fff) 4 byte -
 * 01xxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Represents the value > 16383 && <=
 * 0x3fffffff 8 byte - 1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
 * xxxxxxxx xxxxxxxx Represents the value > 0x3fffffff && <= MAX_LONG
 * 
 * </PRE>
 * 
 * 
 * @exception IOException
 *              value is negative or an exception was thrown by a method on
 *              out.
 */
public static final int writeLong(DataOutput out, long value) throws IOException {

    if (value < 0)
        throw new IOException();

    if (value <= 0x3fff) {

        out.writeByte((int) ((value >>> 8) & 0xff));
        out.writeByte((int) ((value) & 0xff));
        return 2;
    }

    if (value <= 0x3fffffff) {

        out.writeByte((int) (((value >>> 24) | 0x40) & 0xff));
        out.writeByte((int) ((value >>> 16) & 0xff));
        out.writeByte((int) ((value >>> 8) & 0xff));
        out.writeByte((int) ((value) & 0xff));
        return 4;
    }

    out.writeByte((int) (((value >>> 56) | 0x80) & 0xff));
    out.writeByte((int) ((value >>> 48) & 0xff));
    out.writeByte((int) ((value >>> 40) & 0xff));
    out.writeByte((int) ((value >>> 32) & 0xff));
    out.writeByte((int) ((value >>> 24) & 0xff));
    out.writeByte((int) ((value >>> 16) & 0xff));
    out.writeByte((int) ((value >>> 8) & 0xff));
    out.writeByte((int) ((value) & 0xff));
    return 8;
}

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