(Breaking) Moved some packages around.

Most of the changes should not break *most* WorldEdit-using plugins,
but implementations of WorldEdit are broken by this change.

src/main/java/com/sk89q/worldedit/util/io/ForwardSeekableInputStream.java

@@ -0,0 +1,102 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.util.io;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ForwardSeekableInputStream extends InputStream {
+
+    protected InputStream parent;
+    protected long position = 0;
+
+    public ForwardSeekableInputStream(InputStream parent) {
+        this.parent = parent;
+    }
+
+    @Override
+    public int read() throws IOException {
+        int ret = parent.read();
+        ++position;
+        return ret;
+    }
+
+    @Override
+    public int available() throws IOException {
+        return parent.available();
+    }
+
+    @Override
+    public void close() throws IOException {
+        parent.close();
+    }
+
+    @Override
+    public synchronized void mark(int readlimit) {
+        parent.mark(readlimit);
+    }
+
+    @Override
+    public boolean markSupported() {
+        return parent.markSupported();
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException {
+        int read = super.read(b, off, len);
+        position += read;
+        return read;
+    }
+
+    @Override
+    public int read(byte[] b) throws IOException {
+        int read = parent.read(b);
+        position += read;
+        return read;
+    }
+
+    @Override
+    public synchronized void reset() throws IOException {
+        parent.reset();
+    }
+
+    @Override
+    public long skip(long n) throws IOException {
+        long skipped = parent.skip(n);
+        position += skipped;
+        return skipped;
+    }
+
+    public void seek(long n) throws IOException {
+        long diff = n - position;
+
+        if (diff < 0) {
+            throw new IOException("Can't seek backwards");
+        }
+
+        if (diff == 0) {
+            return;
+        }
+
+        if (skip(diff) < diff) {
+            throw new IOException("Failed to seek " + diff + " bytes");
+        }
+    }
+}