base mod created

build/tmp/recompileMc/sources/ibxm/Pattern.java

@@ -0,0 +1,60 @@
+
+package ibxm;
+
+public class Pattern {
+	public int num_rows;
+	
+	private int data_offset, note_index;
+	private byte[] pattern_data;
+
+	public Pattern() {
+		num_rows = 1;
+		set_pattern_data( new byte[ 0 ] );
+	}
+	
+	public void set_pattern_data( byte[] data ) {
+		if( data != null ) {
+			pattern_data = data;
+		}
+		data_offset = 0;
+		note_index = 0;
+	}
+
+	public void get_note( int[] note, int index ) {
+		if( index < note_index ) {
+			note_index = 0;
+			data_offset = 0;
+		}
+		while( note_index <= index ) {
+			data_offset = next_note( data_offset, note );
+			note_index += 1;
+		}
+	}
+
+	public int next_note( int data_offset, int[] note ) {
+		int bitmask, field;
+		if( data_offset < 0 ) {
+			data_offset = pattern_data.length;
+		}
+		bitmask = 0x80;
+		if( data_offset < pattern_data.length ) {
+			bitmask = pattern_data[ data_offset ] & 0xFF;
+		}
+		if( ( bitmask & 0x80 ) == 0x80 ) {
+			data_offset += 1;
+		} else {
+			bitmask = 0x1F;
+		}
+		for( field = 0; field < 5; field++ ) {
+			note[ field ] = 0;
+			if( ( bitmask & 0x01 ) == 0x01 ) {
+				if( data_offset < pattern_data.length ) {
+					note[ field ] = pattern_data[ data_offset ] & 0xFF;
+					data_offset += 1;
+				}
+			}
+			bitmask = bitmask >> 1;
+		}
+		return data_offset;
+	}
+}