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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#ifndef SequenceQueue_H
+#define SequenceQueue_H
+
+//
+// List of outstanding request messages which
+// are waiting for a reply. This class is used
+// in X client and server channels to correlate
+// the replies sequence numbers to the original
+// request type.
+//
+
+class SequenceQueue
+{
+ public:
+
+ SequenceQueue();
+
+ virtual ~SequenceQueue();
+
+ void push(unsigned short int sequence, unsigned char opcode,
+ unsigned int data1 = 0, unsigned int data2 = 0,
+ unsigned int data3 = 0);
+
+ int peek(unsigned short int &sequence, unsigned char &opcode);
+
+ int peek(unsigned short int &sequence, unsigned char &opcode,
+ unsigned int &data1, unsigned int &data2,
+ unsigned int &data3);
+
+ int pop(unsigned short int &sequence, unsigned char &opcode,
+ unsigned int &data1, unsigned int &data2,
+ unsigned int &data3);
+
+ int pop(unsigned short int &sequence, unsigned char &opcode)
+ {
+ unsigned int data1, data2, data3;
+
+ return pop(sequence, opcode, data1, data2, data3);
+ }
+
+ int length()
+ {
+ return length_;
+ }
+
+ private:
+
+ struct RequestSequence
+ {
+ unsigned short int sequence;
+ unsigned char opcode;
+ unsigned int data1;
+ unsigned int data2;
+ unsigned int data3;
+ };
+
+ RequestSequence *queue_;
+
+ unsigned int size_;
+ unsigned int length_;
+
+ unsigned int start_;
+ unsigned int end_;
+};
+
+#endif /* SequenceQueue_H */