Example usage for java.io DataInput readUnsignedByte

Introduction

In this page you can find the example usage for java.io DataInput readUnsignedByte.

Prototype

int readUnsignedByte() throws IOException;

Source Link

Document

Reads one input byte, zero-extends it to type int , and returns the result, which is therefore in the range 0 through 255 .

Usage

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

/**
 * @param in// w w w .j  a  va2s .  c  o  m
 * @return
 * @throws IOException
 */
public static long readVULong(DataInput in) throws IOException {
    int b = in.readUnsignedByte();
    if (b <= 0xf7) {
        return b;
    }
    // 248 <= v <= maxLong

    b -= 0xf7;
    long v = 0;
    do {
        v = (v << 8) | in.readUnsignedByte();
        b--;
    } while (b > 0);

    v += 0xf8;
    return v;
}

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

/**
 * @param in//from w  w w .ja va  2 s.  co m
 * @return
 * @throws IOException
 */
public static int readVUInt(DataInput in) throws IOException {
    int b = in.readUnsignedByte();
    if (b <= 0xfB) {
        return b;
    }
    // 252 <= v <= maxLong

    b -= 0xfB;
    int v = 0;
    do {
        v = (v << 8) | in.readUnsignedByte();
        b--;
    } while (b > 0);

    v += 0xFC;
    return v;
}

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From source file:CompressedNumber.java

/**
 * Read a long previously written by writeLong().
 * //from  w  w  w . j  a va2 s . com
 * @exception IOException
 *              an exception was thrown by a method on in.
 */
public static final long readLong(DataInput in) throws IOException {

    int int_value = in.readUnsignedByte();

    if ((int_value & ~0x3f) == 0) {
        // test for small case first - assuming this is usual case.
        // this is stored in 2 bytes.

        return ((int_value << 8) | in.readUnsignedByte());
    } else if ((int_value & 0x80) == 0) {
        // value is stored in 4 bytes. only use low 6 bits from 1st byte.

        return (((int_value & 0x3f) << 24) | (in.readUnsignedByte() << 16) | (in.readUnsignedByte() << 8)
                | (in.readUnsignedByte()));
    } else {
        // value is stored in 8 bytes. only use low 7 bits from 1st byte.
        return ((((long) (int_value & 0x7f)) << 56) | (((long) in.readUnsignedByte()) << 48)
                | (((long) in.readUnsignedByte()) << 40) | (((long) in.readUnsignedByte()) << 32)
                | (((long) in.readUnsignedByte()) << 24) | (((long) in.readUnsignedByte()) << 16)
                | (((long) in.readUnsignedByte()) << 8) | (((long) in.readUnsignedByte())));
    }
}

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From source file:CompressedNumber.java

/**
 * Read an integer previously written by writeInt().
 * /* ww w  .java  2  s.  co  m*/
 * @exception IOException
 *              an exception was thrown by a method on in.
 */
public static final int readInt(DataInput in) throws IOException {

    int value = in.readUnsignedByte();

    if ((value & ~0x3f) == 0) {
        // length is stored in this byte, we also know that the 0x80 bit
        // was not set, so no need to mask off the sign extension from
        // the byte to int conversion.

        // account for 1 byte stored length of field + 1 for all returns
        return (value);
    } else if ((value & 0x80) == 0) {
        // length is stored in 2 bytes. only use low 6 bits from 1st byte.

        // top 8 bits of 2 byte length is stored in this byte, we also
        // know that the 0x80 bit was not set, so no need to mask off the
        // sign extension from the 1st byte to int conversion. Need to
        // mask the byte in data[offset + 1] to account for possible sign
        // extension.

        return (((value & 0x3f) << 8) | in.readUnsignedByte());
    } else {

        // top 8 bits of 4 byte length is stored in this byte, we also
        // know that the 0x80 bit was set, so need to mask off the
        // sign extension from the 1st byte to int conversion. Need to
        // mask the bytes from the next 3 bytes data[offset + 1,2,3] to
        // account for possible sign extension.
        //
        return (((value & 0x7f) << 24) | (in.readUnsignedByte() << 16) | (in.readUnsignedByte() << 8)
                | (in.readUnsignedByte()));
    }
}

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

/**
 * @param in//from   w w w. j av a2 s  . com
 * @return
 * @throws IOException
 */
public static long readVSLong(DataInput in) throws IOException {
    int flip;
    int b = in.readUnsignedByte();
    if (b >= 0x08) {
        if (b <= 0xf7) {
            return b - 0x80;
        }
        // v >= 120
        flip = 0;
    } else
    // v <= -121
    {
        flip = 0xff;
    }

    b = (b ^ flip) - 0xf7;
    long v = 0;
    do {
        v = (v << 8) | (in.readUnsignedByte() ^ flip);
        b--;
    } while (b > 0);

    v += 120;
    v ^= (byte) flip; // 0 or -1 as a long -> one's complement for negatives
    return v;
}

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From source file:eu.stratosphere.types.StringValue.java

public static final void copyString(DataInput in, DataOutput out) throws IOException {
    int len = in.readUnsignedByte();
    out.writeByte(len);//from  w  w  w.  j a  va  2s .com

    if (len >= HIGH_BIT) {
        int shift = 7;
        int curr;
        len = len & 0x7f;
        while ((curr = in.readUnsignedByte()) >= HIGH_BIT) {
            out.writeByte(curr);
            len |= (curr & 0x7f) << shift;
            shift += 7;
        }
        out.writeByte(curr);
        len |= curr << shift;
    }

    // note that the length is one larger than the actual length (length 0 is a null string, not a zero length string)
    len--;

    for (int i = 0; i < len; i++) {
        int c = in.readUnsignedByte();
        out.writeByte(c);
        while (c >= HIGH_BIT) {
            c = in.readUnsignedByte();
            out.writeByte(c);
        }
    }
}

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From source file:eu.stratosphere.types.StringValue.java

public static final String readString(DataInput in) throws IOException {
    // the length we read is offset by one, because a length of zero indicates a null value
    int len = in.readUnsignedByte();

    if (len == 0) {
        return null;
    }/*www  .  j  av a2s  . com*/

    if (len >= HIGH_BIT) {
        int shift = 7;
        int curr;
        len = len & 0x7f;
        while ((curr = in.readUnsignedByte()) >= HIGH_BIT) {
            len |= (curr & 0x7f) << shift;
            shift += 7;
        }
        len |= curr << shift;
    }

    // subtract one for the null length
    len -= 1;

    final char[] data = new char[len];

    for (int i = 0; i < len; i++) {
        int c = in.readUnsignedByte();
        if (c < HIGH_BIT) {
            data[i] = (char) c;
        } else {
            int shift = 7;
            int curr;
            c = c & 0x7f;
            while ((curr = in.readUnsignedByte()) >= HIGH_BIT) {
                c |= (curr & 0x7f) << shift;
                shift += 7;
            }
            c |= curr << shift;
            data[i] = (char) c;
        }
    }

    return new String(data, 0, len);
}

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From source file:bobs.is.compress.sevenzip.SevenZFile.java

private static long readUint64(final DataInput in) throws IOException {
    // long rather than int as it might get shifted beyond the range of an int
    final long firstByte = in.readUnsignedByte();
    int mask = 0x80;
    long value = 0;
    for (int i = 0; i < 8; i++) {
        if ((firstByte & mask) == 0) {
            return value | ((firstByte & (mask - 1)) << (8 * i));
        }// w  w  w  . j  a v a2  s  . co m
        final long nextByte = in.readUnsignedByte();
        value |= nextByte << (8 * i);
        mask >>>= 1;
    }
    return value;
}

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From source file:eu.stratosphere.types.StringValue.java

@Override
public void read(final DataInput in) throws IOException {
    int len = in.readUnsignedByte();

    if (len >= HIGH_BIT) {
        int shift = 7;
        int curr;
        len = len & 0x7f;/* w  w  w.j a v  a2 s . c  o  m*/
        while ((curr = in.readUnsignedByte()) >= HIGH_BIT) {
            len |= (curr & 0x7f) << shift;
            shift += 7;
        }
        len |= curr << shift;
    }

    this.len = len;
    this.hashCode = 0;
    ensureSize(len);
    final char[] data = this.value;

    for (int i = 0; i < len; i++) {
        int c = in.readUnsignedByte();
        if (c < HIGH_BIT) {
            data[i] = (char) c;
        } else {
            int shift = 7;
            int curr;
            c = c & 0x7f;
            while ((curr = in.readUnsignedByte()) >= HIGH_BIT) {
                c |= (curr & 0x7f) << shift;
                shift += 7;
            }
            c |= curr << shift;
            data[i] = (char) c;
        }
    }
}

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From source file:bobs.is.compress.sevenzip.SevenZFile.java

private BitSet readAllOrBits(final DataInput header, final int size) throws IOException {
    final int areAllDefined = header.readUnsignedByte();
    final BitSet bits;
    if (areAllDefined != 0) {
        bits = new BitSet(size);
        for (int i = 0; i < size; i++) {
            bits.set(i, true);//w  w  w . j a  v  a 2s . c o  m
        }
    } else {
        bits = readBits(header, size);
    }
    return bits;
}

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