1 files changed, 56 insertions, 0 deletions
diff --git a/client/cpp/encoder_demo.cc b/client/cpp/encoder_demo.cc
new file mode 100644
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--- /dev/null
+++ b/client/cpp/encoder_demo.cc
@@ -0,0 +1,56 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Sample code for encoder.cc.
+//
+// This is the code in README.md.  It's here to make sure it actually builds
+// and runs.
+
+#include <cassert>  // assert
+
+#include "encoder.h"
+#include "openssl_hash_impl.h"
+#include "unix_kernel_rand_impl.h"
+
+int main(int argc, char** argv) {
+  // Suppress unused variable warnings
+  (void) argc;
+  (void) argv;
+
+  FILE* fp = fopen("/dev/urandom", "r");
+  rappor::UnixKernelRand irr_rand(fp);
+
+  rappor::Deps deps(rappor::Md5, "client-secret", rappor::HmacSha256,
+                    irr_rand);
+  rappor::Params params(32,    // num_bits (k)
+                        2,     // num_hashes (h)
+                        128,   // num_cohorts (m)
+                        0.25,  // probability f for PRR
+                        0.75,  // probability p for IRR
+                        0.5);  // probability q for IRR
+
+  const char* encoder_id = "metric-name";
+  rappor::Encoder encoder(encoder_id, params, deps);
+
+  // Now use it to encode values.  The 'out' value can be sent over the
+  // network.
+  rappor::Bits out;
+  assert(encoder.EncodeString("foo", &out));  // returns false on error
+  printf("'foo' encoded with RAPPOR: %0x, cohort %d\n", out, encoder.cohort());
+
+  // Raw bits
+  assert(encoder.EncodeBits(0x123, &out));  // returns false on error
+  printf("0x123 encoded with RAPPOR: %0x, cohort %d\n", out, encoder.cohort());
+}
+