Move webrtc/{base => rtc_base}

webrtc/base/helpers.cc

-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/base/helpers.h"
-
-#include <limits>
-#include <memory>
-
-#include <openssl/rand.h>
-
-#include "webrtc/base/base64.h"
-#include "webrtc/base/basictypes.h"
-#include "webrtc/base/checks.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/base/timeutils.h"
-
-// Protect against max macro inclusion.
-#undef max
-
-namespace rtc {
-
-// Base class for RNG implementations.
-class RandomGenerator {
- public:
-  virtual ~RandomGenerator() {}
-  virtual bool Init(const void* seed, size_t len) = 0;
-  virtual bool Generate(void* buf, size_t len) = 0;
-};
-
-// The OpenSSL RNG.
-class SecureRandomGenerator : public RandomGenerator {
- public:
-  SecureRandomGenerator() {}
-  ~SecureRandomGenerator() override {}
-  bool Init(const void* seed, size_t len) override { return true; }
-  bool Generate(void* buf, size_t len) override {
-    return (RAND_bytes(reinterpret_cast<unsigned char*>(buf), len) > 0);
-  }
-};
-
-// A test random generator, for predictable output.
-class TestRandomGenerator : public RandomGenerator {
- public:
-  TestRandomGenerator() : seed_(7) {
-  }
-  ~TestRandomGenerator() override {
-  }
-  bool Init(const void* seed, size_t len) override { return true; }
-  bool Generate(void* buf, size_t len) override {
-    for (size_t i = 0; i < len; ++i) {
-      static_cast<uint8_t*>(buf)[i] = static_cast<uint8_t>(GetRandom());
-    }
-    return true;
-  }
-
- private:
-  int GetRandom() {
-    return ((seed_ = seed_ * 214013L + 2531011L) >> 16) & 0x7fff;
-  }
-  int seed_;
-};
-
-namespace {
-
-// TODO: Use Base64::Base64Table instead.
-static const char kBase64[64] = {
-    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
-    'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
-    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
-    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};
-
-static const char kHex[16] = {'0', '1', '2', '3', '4', '5', '6', '7',
-                              '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
-
-static const char kUuidDigit17[4] = {'8', '9', 'a', 'b'};
-
-// This round about way of creating a global RNG is to safe-guard against
-// indeterminant static initialization order.
-std::unique_ptr<RandomGenerator>& GetGlobalRng() {
-  RTC_DEFINE_STATIC_LOCAL(std::unique_ptr<RandomGenerator>, global_rng,
-                          (new SecureRandomGenerator()));
-  return global_rng;
-}
-
-RandomGenerator& Rng() {
-  return *GetGlobalRng();
-}
-
-}  // namespace
-
-void SetRandomTestMode(bool test) {
-  if (!test) {
-    GetGlobalRng().reset(new SecureRandomGenerator());
-  } else {
-    GetGlobalRng().reset(new TestRandomGenerator());
-  }
-}
-
-bool InitRandom(int seed) {
-  return InitRandom(reinterpret_cast<const char*>(&seed), sizeof(seed));
-}
-
-bool InitRandom(const char* seed, size_t len) {
-  if (!Rng().Init(seed, len)) {
-    LOG(LS_ERROR) << "Failed to init random generator!";
-    return false;
-  }
-  return true;
-}
-
-std::string CreateRandomString(size_t len) {
-  std::string str;
-  RTC_CHECK(CreateRandomString(len, &str));
-  return str;
-}
-
-static bool CreateRandomString(size_t len,
-                        const char* table, int table_size,
-                        std::string* str) {
-  str->clear();
-  // Avoid biased modulo division below.
-  if (256 % table_size) {
-    LOG(LS_ERROR) << "Table size must divide 256 evenly!";
-    return false;
-  }
-  std::unique_ptr<uint8_t[]> bytes(new uint8_t[len]);
-  if (!Rng().Generate(bytes.get(), len)) {
-    LOG(LS_ERROR) << "Failed to generate random string!";
-    return false;
-  }
-  str->reserve(len);
-  for (size_t i = 0; i < len; ++i) {
-    str->push_back(table[bytes[i] % table_size]);
-  }
-  return true;
-}
-
-bool CreateRandomString(size_t len, std::string* str) {
-  return CreateRandomString(len, kBase64, 64, str);
-}
-
-bool CreateRandomString(size_t len, const std::string& table,
-                        std::string* str) {
-  return CreateRandomString(len, table.c_str(),
-                            static_cast<int>(table.size()), str);
-}
-
-bool CreateRandomData(size_t length, std::string* data) {
-  data->resize(length);
-  // std::string is guaranteed to use contiguous memory in c++11 so we can
-  // safely write directly to it.
-  return Rng().Generate(&data->at(0), length);
-}
-
-// Version 4 UUID is of the form:
-// xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
-// Where 'x' is a hex digit, and 'y' is 8, 9, a or b.
-std::string CreateRandomUuid() {
-  std::string str;
-  std::unique_ptr<uint8_t[]> bytes(new uint8_t[31]);
-  RTC_CHECK(Rng().Generate(bytes.get(), 31));
-  str.reserve(36);
-  for (size_t i = 0; i < 8; ++i) {
-    str.push_back(kHex[bytes[i] % 16]);
-  }
-  str.push_back('-');
-  for (size_t i = 8; i < 12; ++i) {
-    str.push_back(kHex[bytes[i] % 16]);
-  }
-  str.push_back('-');
-  str.push_back('4');
-  for (size_t i = 12; i < 15; ++i) {
-    str.push_back(kHex[bytes[i] % 16]);
-  }
-  str.push_back('-');
-  str.push_back(kUuidDigit17[bytes[15] % 4]);
-  for (size_t i = 16; i < 19; ++i) {
-    str.push_back(kHex[bytes[i] % 16]);
-  }
-  str.push_back('-');
-  for (size_t i = 19; i < 31; ++i) {
-    str.push_back(kHex[bytes[i] % 16]);
-  }
-  return str;
-}
-
-uint32_t CreateRandomId() {
-  uint32_t id;
-  RTC_CHECK(Rng().Generate(&id, sizeof(id)));
-  return id;
-}
-
-uint64_t CreateRandomId64() {
-  return static_cast<uint64_t>(CreateRandomId()) << 32 | CreateRandomId();
-}
-
-uint32_t CreateRandomNonZeroId() {
-  uint32_t id;
-  do {
-    id = CreateRandomId();
-  } while (id == 0);
-  return id;
-}
-
-double CreateRandomDouble() {
-  return CreateRandomId() / (std::numeric_limits<uint32_t>::max() +
-                             std::numeric_limits<double>::epsilon());
-}
-
-}  // namespace rtc