First version of a QUIC SendAlgorithmSimulator which is designed to

net/quic/test_tools/quic_test_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Common utilities for Quic tests
 
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_
 
 #include <string>
@@ skipping 104 matching lines @@
     *name_ = value_;
   }
 
  private:
   SaveType* name_;
   SaveType value_;
 
   DISALLOW_COPY_AND_ASSIGN(ValueRestore);
 };
 
+// Simple random number generator used to compute random numbers suitable
+// for pseudo-randomly dropping packets in tests.  It works by computing
+// the sha1 hash of the current seed, and using the first 64 bits as
+// the next random number, and the next seed.
+class SimpleRandom {
+ public:
+  SimpleRandom() : seed_(0) {}
+
+  // Returns a random number in the range [0, kuint64max].
+  uint64 RandUint64();
+
+  void set_seed(uint64 seed) { seed_ = seed; }
+
+ private:
+  uint64 seed_;
+
+  DISALLOW_COPY_AND_ASSIGN(SimpleRandom);
+};
+
 class MockFramerVisitor : public QuicFramerVisitorInterface {
  public:
   MockFramerVisitor();
   virtual ~MockFramerVisitor();
 
   MOCK_METHOD1(OnError, void(QuicFramer* framer));
   // The constructor sets this up to return false by default.
   MOCK_METHOD1(OnProtocolVersionMismatch, bool(QuicVersion version));
   MOCK_METHOD0(OnPacket, void());
   MOCK_METHOD1(OnPublicResetPacket, void(const QuicPublicResetPacket& header));
@@ skipping 366 matching lines @@
   virtual ~MockAckNotifierDelegate();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockAckNotifierDelegate);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_