Example usage for java.io DataInput readByte

Introduction

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

Prototype

byte readByte() throws IOException;

Source Link

Document

Reads and returns one input byte.

Usage

From source file:org.godhuli.rhipe.RHBytesWritable.java

public static int readVInt(final DataInput stream) throws IOException {
    final byte firstByte = stream.readByte();
    final int len = decodeVIntSize(firstByte);
    if (len == 1) {
        return firstByte;
    }/*from   w  ww.j  a  v a 2s. c  o m*/
    long i = 0;
    for (int idx = 0; idx < len - 1; idx++) {
        final byte b = stream.readByte();
        i = i << 8;
        i = i | (b & 0xFF);
    }
    return ((int) ((isNegativeVInt(firstByte) ? (i ^ -1L) : i)));

}

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From source file:org.kalypso.shape.dbf.DBFField.java

public static IDBFField read(final DataInput input, final Charset charset) throws IOException, DBaseException {
    final byte[] columnNameBytes = new byte[MAX_COLUMN_NAME_LENGTH];
    input.readFully(columnNameBytes);//  w  w w .j a  v  a 2  s .  c  o m

    final int columNameLength = findColumnNameLength(columnNameBytes);

    final String columnName = new String(columnNameBytes, 0, columNameLength, charset);

    final char columnType = (char) input.readByte();

    input.skipBytes(4);

    // get field length and precision
    final short fieldLength = DataUtils.fixByte(input.readByte());
    final short decimalCount = DataUtils.fixByte(input.readByte());

    input.skipBytes(14);

    final FieldType fieldType = FieldType.valueOf("" + columnType);
    return new DBFField(columnName, fieldType, fieldLength, decimalCount);
}

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From source file:org.mitre.la.mapred.io.DenseVectorWritable.java

/**
 * Deserialize the fields of this object from <code>in</code>.
 *
 * @param in <code>DataInput</code> to deseriablize this object from.
 * @throws IOException/*from   w  w  w .j  a v a  2  s  .c o  m*/
 */
@Override
public void readFields(DataInput in) throws IOException {
    in.readByte();
    String label = in.readUTF();
    int length = in.readInt();
    double[] v = new double[length];
    for (int i = 0; i < length; i++) {
        v[i] = in.readDouble();
    }
    this.dv = new DenseVector(label, v);
}

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From source file:org.netbeans.nbbuild.VerifyClassLinkageForIISI.java

public static Set<String> dependencies(byte[] data) throws IOException {
    Set<String> result = new TreeSet<String>();
    DataInput input = new DataInputStream(new ByteArrayInputStream(data));
    skip(input, 8); // magic, minor_version, major_version
    int size = input.readUnsignedShort() - 1; // constantPoolCount
    String[] utf8Strings = new String[size];
    boolean[] isClassName = new boolean[size];
    boolean[] isDescriptor = new boolean[size];
    for (int i = 0; i < size; i++) {
        byte tag = input.readByte();
        switch (tag) {
        case 1: // CONSTANT_Utf8
            utf8Strings[i] = input.readUTF();
            break;
        case 7: // CONSTANT_Class
            int index = input.readUnsignedShort() - 1;
            if (index >= size) {
                throw new IOException("@" + i + ": CONSTANT_Class_info.name_index " + index
                        + " too big for size of pool " + size);
            }/*from  www .j  a v  a  2 s  . c om*/
            //log("Class reference at " + index, Project.MSG_DEBUG);
            isClassName[index] = true;
            break;
        case 3: // CONSTANT_Integer
        case 4: // CONSTANT_Float
        case 9: // CONSTANT_Fieldref
        case 10: // CONSTANT_Methodref
        case 11: // CONSTANT_InterfaceMethodref
            skip(input, 4);
            break;
        case 12: // CONSTANT_NameAndType
            skip(input, 2);
            index = input.readUnsignedShort() - 1;
            if (index >= size || index < 0) {
                throw new IOException("@" + i + ": CONSTANT_NameAndType_info.descriptor_index " + index
                        + " too big for size of pool " + size);
            }
            isDescriptor[index] = true;
            break;
        case 8: // CONSTANT_String
            skip(input, 2);
            break;
        case 5: // CONSTANT_Long
        case 6: // CONSTANT_Double
            skip(input, 8);
            i++; // weirdness in spec
            break;
        default:
            throw new IOException("Unrecognized constant pool tag " + tag + " at index " + i
                    + "; running UTF-8 strings: " + Arrays.asList(utf8Strings));
        }
    }
    //task.log("UTF-8 strings: " + Arrays.asList(utf8Strings), Project.MSG_DEBUG);
    for (int i = 0; i < size; i++) {
        String s = utf8Strings[i];
        final Set<String> classNameSet = extractClassName(s);

        if (s != null) {
            if (CollectionUtils.isNotEmpty(classNameSet)) {
                result.addAll(classNameSet);
            }

        }

    }
    return result;
}

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From source file:uk.ac.cam.eng.extraction.hadoop.datatypes.ProvenanceCountMap.java

@Override
public void readFields(DataInput in) throws IOException {
    instance.clear();/*from  w w  w .j av  a 2  s. c  o  m*/
    byte length = in.readByte();
    for (int i = 0; i < length; ++i) {
        byte key = in.readByte();
        int value = in.readInt();
        instance.put(getCached(key), getCached(value));
    }

}

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From source file:w2v.WordToVec.java

private String readWord(DataInput dataInput) throws IOException {
    StringBuilder sb = new StringBuilder();
    while (true) {
        byte ch;// w  w  w  . java2s .  c o m
        if (ungetc != null) {
            ch = ungetc;
            ungetc = null;
        } else {
            try {
                ch = dataInput.readByte();
            } catch (EOFException eofe) {
                break;
            }
        }
        if (ch == '\r') {
            continue;
        }
        if ((ch == ' ') || (ch == '\t') || (ch == '\n')) {
            if (sb.length() > 0) {
                if (ch == '\n') {
                    ungetc = ch;
                }
                break;
            }
            if (ch == '\n') {
                return "</s>";
            } else {
                continue;
            }
        }
        sb.append((char) ch);

        // Truncate too long words
        if (sb.length() >= MAX_STRING - 1) {
            sb.deleteCharAt(sb.length() - 1);
        }
    }
    String word = sb.length() == 0 ? null : sb.toString();
    return word;
}

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