package code.kalter.longflight;

/**
 * Удобное чтение разных типов с байтового массива
 *
 * @author KalterFive
 */
public class ByteArrayInputStream {

    private final byte[] array;
    private int position;

    public ByteArrayInputStream(byte[] array) {
        this.array = array;
        position = 0;
    }

    public byte readByte() {
        return array[position++];
    }

    public short readShort() {
        // AND для того, чтобы читать байт без знака
        final short a = (short) (readByte() & 0x00FF);
        final short b = (short) (readByte() & 0x00FF);
        return (short) ((a << 8) | b);
    }

    public int readInteger() {
        final int a = readShort();
        final int b = readShort();
        return (int) ((a << 16) | b);
    }

    public long readLong() {
        final long a = readInteger();
        final long b = readInteger();
        return (long) ((a << 32) | b);
    }

    public byte[] toByteArray(int size) {
        final byte[] array = new byte[size];
        for (int i = 0; i < size; i++) {
            array[i] = readByte();
        }
        return array;
    }

    public short[] toShortArray(int size) {
        final short[] array = new short[size];
        for (int i = 0; i < size; i++) {
            array[i] = readShort();
        }
        return array;
    }

    public int[] toIntArray(int size) {
        final int[] array = new int[size];
        for (int i = 0; i < size; i++) {
            array[i] = readInteger();
        }
        return array;
    }

    public long[] toLongArray(int size) {
        final long[] array = new long[size];
        for (int i = 0; i < size; i++) {
            array[i] = readLong();
        }
        return array;
    }
}