12dc1a38ca
The C++ headers define the C functions within the std:: namespace, but we mainly don't use the std:: namespace for C functions. Therefore we should include the C headers. BUG=1833 R=tommi@webrtc.org Review URL: https://webrtc-codereview.appspot.com/1917004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4486 4adac7df-926f-26a2-2b94-8c16560cd09d
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/test/libtest/include/random_encryption.h"
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#include <math.h>
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#include <stdlib.h>
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#include <algorithm>
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#include "webrtc/video_engine/vie_defines.h"
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static int Saturate(int value, int min, int max) {
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return std::min(std::max(value, min), max);
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}
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RandomEncryption::RandomEncryption(unsigned int rand_seed) {
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srand(rand_seed);
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}
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// Generates some completely random data with roughly the right length.
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void RandomEncryption::GenerateRandomData(unsigned char* out_data, int bytes_in,
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int* bytes_out) {
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int out_length = MakeUpSimilarLength(bytes_in);
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for (int i = 0; i < out_length; i++) {
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// The modulo will skew the random distribution a bit, but I think it
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// will be random enough.
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out_data[i] = static_cast<unsigned char>(rand() % 256);
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}
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*bytes_out = out_length;
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}
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// Makes up a length within +- 50 of the original length, without
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// overstepping the contract for encrypt / decrypt.
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int RandomEncryption::MakeUpSimilarLength(int original_length) {
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int sign = rand() - RAND_MAX / 2;
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int length = original_length + sign * rand() % 50;
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return Saturate(length, 0, static_cast<int>(webrtc::kViEMaxMtu));
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}
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