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Java/storage/CountingStream.java

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+/*   
+CountingStream.java
+ *    
+ *    Copyright (c) 2001, Ted Nelson and Tuomas Lukka
+ *
+ *    You may use and distribute under the terms of either the GNU Lesser
+ *    General Public License, either version 2 of the license or,
+ *    at your choice, any later version. Alternatively, you may use and
+ *    distribute under the terms of the XPL.
+ *
+ *    See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of 
+ *    the licenses.
+ *
+ *    This software is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the README
+ *    file for more details.
+ *
+ */
+/*
+ * Written by Tuomas Lukka
+ */
+package org.gzigzag;
+import java.awt.*;
+import java.util.*;
+import java.io.*;
+
+/** Something Java should have: we conut our position in the stream.
+ */
+
+public class CountingStream extends FilterInputStream {
+
+    int curPos = 0;
+
+    public CountingStream(InputStream is) {
+	    super(is);
+    }
+
+    public int read() throws IOException {
+	int c = super.read();
+	curPos++;
+	return c;
+    }
+
+    public int read(byte b[]) throws IOException {
+	int n = super.read(b);
+	if(n < 0) return n;
+	curPos += n;
+	return n;
+    }
+
+    public int read(byte b[],
+		     int off,
+		     int len) throws IOException {
+	int n = super.read(b, off, len);
+	if(n < 0) return n;
+	curPos += n;
+	return n;
+    }
+    
+    public long skip(long n) throws IOException {
+	long ns = super.skip(n);
+	curPos += ns;
+	return ns;
+    }
+
+    public int getCount() {
+	return curPos;
+    }
+
+}