1.0 preparations

brouter-util/src/main/java/btools/util/ByteDataReader.java

@@ -0,0 +1,95 @@
+/**
+ * fast data-reading from a byte-array
+ *
+ * @author ab
+ */
+package btools.util;
+
+
+public class ByteDataReader
+{
+  protected byte[] ab;
+  protected int aboffset;
+
+  public ByteDataReader( byte[] byteArray )
+  {
+	 ab = byteArray;
+  }
+
+  public final int readInt()
+  {
+      int i3 = ab[aboffset++]& 0xff;
+      int i2 = ab[aboffset++]& 0xff;
+      int i1 = ab[aboffset++]& 0xff;
+      int i0 = ab[aboffset++]& 0xff;
+      return (i3 << 24) + (i2 << 16) + (i1 << 8) + i0;
+  }
+
+  public final long readLong()
+  {
+      long i7 = ab[aboffset++]& 0xff;
+      long i6 = ab[aboffset++]& 0xff;
+      long i5 = ab[aboffset++]& 0xff;
+      long i4 = ab[aboffset++]& 0xff;
+      long i3 = ab[aboffset++]& 0xff;
+      long i2 = ab[aboffset++]& 0xff;
+      long i1 = ab[aboffset++]& 0xff;
+      long i0 = ab[aboffset++]& 0xff;
+      return (i7 << 56) + (i6 << 48) + (i5 << 40) + (i4 << 32) + (i3 << 24) + (i2 << 16) + (i1 << 8) + i0;
+  }
+
+  public final boolean readBoolean()
+  {
+      int i0 = ab[aboffset++]& 0xff;
+      return i0 != 0;
+  }
+
+  public final byte readByte()
+  {
+      int i0 = ab[aboffset++] & 0xff;
+      return (byte)(i0);
+  }
+
+  public final short readShort()
+  {
+      int i1 = ab[aboffset++] & 0xff;
+      int i0 = ab[aboffset++] & 0xff;
+      return (short)( (i1 << 8) | i0);
+  }
+
+  public final int readVarLengthSigned()
+  {
+	  int v = readVarLengthUnsigned();
+	  return ( v & 1 ) == 0 ? v >> 1 : -(v >> 1 );
+  }
+
+  public final int readVarLengthUnsigned()
+  {
+	int v = 0;
+	int shift = 0;
+	for(;;)
+	{
+	  int i7 = ab[aboffset++] & 0xff;
+	  v |= (( i7 & 0x7f ) << shift);
+	  if ( ( i7 & 0x80 ) == 0 ) break;
+	  shift += 7;
+	}
+	return v;
+  }
+
+  public final void readFully( byte[] ta )
+  {
+	  System.arraycopy( ab, aboffset, ta, 0, ta.length );
+	  aboffset += ta.length;
+  }
+
+  @Override
+  public String toString()
+  {
+	  StringBuilder sb = new StringBuilder( "[" );
+	  for( int i=0; i<ab.length; i++ ) sb.append( i == 0 ? " " : ", " ).append( Integer.toString( ab[i] ) );
+      sb.append( " ]" );
+      return sb.toString();
+  }
+
+}