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// 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());
}
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