--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/os/win32/Buffer.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2001 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#ifndef _BUFFER_
+#define _BUFFER_
+
+// A Buffer is the backing store for the IOBuf abstraction and
+// supports producer-consumer filling and draining.
+
+class Buffer {
+public:
+  Buffer(int bufSize);
+  ~Buffer();
+
+  char* fillPos();   // Position of the place where buffer should be filled
+  int   remaining(); // Number of bytes that can be placed starting at fillPos
+  int   size();      // Size of the buffer
+  // Move up fill position by amount (decreases remaining()); returns
+  // false if not enough space
+  bool  incrFillPos(int amt);
+
+  // Read single byte (0..255); returns -1 if no data available.
+  int   readByte();
+  // Read multiple bytes, non-blocking (this buffer does not define a
+  // fill mechanism), into provided buffer. Returns number of bytes read.
+  int   readBytes(char* buf, int len);
+
+  // Access to drain position. Be very careful using this.
+  char* drainPos();
+  int   drainRemaining();
+  bool  incrDrainPos(int amt);
+
+  // Compact buffer, removing already-consumed input. This must be
+  // called periodically to yield the illusion of an infinite buffer.
+  void  compact();
+
+private:
+  Buffer(const Buffer&);
+  Buffer& operator=(const Buffer&);
+
+  char* buf;
+  int   sz;
+  int   fill;
+  int   drain;
+};
+
+#endif // #defined _BUFFER_