1.0 preparations

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

@@ -0,0 +1,111 @@
+/**
+ * fast data-writing to a byte-array
+ *
+ * @author ab
+ */
+package btools.util;
+
+
+public final class ByteDataWriter
+{
+  private byte[] ab;
+  private int aboffset;
+
+  public ByteDataWriter( byte[] byteArray )
+  {
+	 ab = byteArray;
+  }
+
+  public void writeInt( int v )
+  {
+	ab[aboffset++] = (byte)( (v >> 24) & 0xff );
+    ab[aboffset++] = (byte)( (v >> 16) & 0xff );
+	ab[aboffset++] = (byte)( (v >>  8) & 0xff );
+    ab[aboffset++] = (byte)( (v      ) & 0xff );
+  }
+
+  public void writeLong( long v )
+  {
+	ab[aboffset++] = (byte)( (v >> 56) & 0xff );
+    ab[aboffset++] = (byte)( (v >> 48) & 0xff );
+	ab[aboffset++] = (byte)( (v >> 40) & 0xff );
+    ab[aboffset++] = (byte)( (v >> 32) & 0xff );
+	ab[aboffset++] = (byte)( (v >> 24) & 0xff );
+    ab[aboffset++] = (byte)( (v >> 16) & 0xff );
+	ab[aboffset++] = (byte)( (v >>  8) & 0xff );
+    ab[aboffset++] = (byte)( (v      ) & 0xff );
+  }
+
+  public void writeBoolean( boolean v)
+  {
+    ab[aboffset++] = (byte)( v ? 1 : 0 );
+  }
+
+  public void writeByte( int v )
+  {
+    ab[aboffset++] = (byte)( (v     ) & 0xff );
+  }
+
+  public void writeShort( int v )
+  {
+    ab[aboffset++] = (byte)( (v >> 8) & 0xff );
+    ab[aboffset++] = (byte)( (v     ) & 0xff );
+  }
+  
+  public void write( byte[] sa )
+  {
+    System.arraycopy( sa, 0, ab, aboffset, sa.length );
+    aboffset += sa.length;
+  }
+  
+  public void write( byte[] sa, int offset, int len )
+  {
+    System.arraycopy( sa, offset, ab, aboffset, len );
+    aboffset += len;
+  }
+
+  public void ensureCapacity( int len )
+  {
+	  // TODO
+  }
+
+  public byte[] toByteArray()
+  {
+    byte[] c = new byte[aboffset];
+    System.arraycopy( ab, 0, c, 0, aboffset );
+    return c;
+  }
+  
+  public int writeVarLengthSigned( int v )
+  {
+    return writeVarLengthUnsigned( v < 0 ? ( (-v) << 1 ) | 1 : v << 1 );
+  }
+
+  public int writeVarLengthUnsigned( int v )
+  {
+	int start = aboffset;
+	do
+	{
+	  int i7 = v & 0x7f;
+	  v >>= 7;
+	  if ( v != 0 ) i7 |= 0x80;
+      ab[aboffset++] = (byte)( i7 & 0xff );
+	}
+	while( v != 0 );
+	return aboffset - start;
+  }
+
+  public int size()
+  {
+    return aboffset;
+  }
+  
+  @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();
+  }
+}