src/code/kalter/longflight/ByteArrayInputStream.java

   1 package code.kalter.longflight;
   2
   3 /**
   4  * Удобное чтение разных типов с байтового массива
   5  *
   6  * @author KalterFive
   7  */
   8 public class ByteArrayInputStream {
   9
  10     private final byte[] array;
  11     private int position;
  12
  13     public ByteArrayInputStream(byte[] array) {
  14         this.array = array;
  15         position = 0;
  16     }
  17
  18     public byte readByte() {
  19         return array[position++];
  20     }
  21
  22     public short readShort() {
  23         // AND для того, чтобы читать байт без знака
  24         final short a = (short) (readByte() & 0x00FF);
  25         final short b = (short) (readByte() & 0x00FF);
  26         return (short) ((a << 8) | b);
  27     }
  28
  29     public int readInteger() {
  30         final int a = readShort();
  31         final int b = readShort();
  32         return (int) ((a << 16) | b);
  33     }
  34
  35     public long readLong() {
  36         final long a = readInteger();
  37         final long b = readInteger();
  38         return (long) ((a << 32) | b);
  39     }
  40
  41     public byte[] toByteArray(int size) {
  42         final byte[] array = new byte[size];
  43         for (int i = 0; i < size; i++) {
  44             array[i] = readByte();
  45         }
  46         return array;
  47     }
  48
  49     public short[] toShortArray(int size) {
  50         final short[] array = new short[size];
  51         for (int i = 0; i < size; i++) {
  52             array[i] = readShort();
  53         }
  54         return array;
  55     }
  56
  57     public int[] toIntArray(int size) {
  58         final int[] array = new int[size];
  59         for (int i = 0; i < size; i++) {
  60             array[i] = readInteger();
  61         }
  62         return array;
  63     }
  64
  65     public long[] toLongArray(int size) {
  66         final long[] array = new long[size];
  67         for (int i = 0; i < size; i++) {
  68             array[i] = readLong();
  69         }
  70         return array;
  71     }
  72 }