Move base to DEPS

base/rand_util.cc

-// Copyright (c) 2011 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.
-
-#include "base/rand_util.h"
-
-#include <math.h>
-#include <stdint.h>
-
-#include <algorithm>
-#include <limits>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/strings/string_util.h"
-
-namespace base {
-
-int RandInt(int min, int max) {
-  DCHECK_LE(min, max);
-
-  uint64 range = static_cast<uint64>(max) - min + 1;
-  int result = min + static_cast<int>(base::RandGenerator(range));
-  DCHECK_GE(result, min);
-  DCHECK_LE(result, max);
-  return result;
-}
-
-double RandDouble() {
-  return BitsToOpenEndedUnitInterval(base::RandUint64());
-}
-
-double BitsToOpenEndedUnitInterval(uint64 bits) {
-  // We try to get maximum precision by masking out as many bits as will fit
-  // in the target type's mantissa, and raising it to an appropriate power to
-  // produce output in the range [0, 1).  For IEEE 754 doubles, the mantissa
-  // is expected to accommodate 53 bits.
-
-  COMPILE_ASSERT(std::numeric_limits<double>::radix == 2, otherwise_use_scalbn);
-  static const int kBits = std::numeric_limits<double>::digits;
-  uint64 random_bits = bits & ((UINT64_C(1) << kBits) - 1);
-  double result = ldexp(static_cast<double>(random_bits), -1 * kBits);
-  DCHECK_GE(result, 0.0);
-  DCHECK_LT(result, 1.0);
-  return result;
-}
-
-uint64 RandGenerator(uint64 range) {
-  DCHECK_GT(range, 0u);
-  // We must discard random results above this number, as they would
-  // make the random generator non-uniform (consider e.g. if
-  // MAX_UINT64 was 7 and |range| was 5, then a result of 1 would be twice
-  // as likely as a result of 3 or 4).
-  uint64 max_acceptable_value =
-      (std::numeric_limits<uint64>::max() / range) * range - 1;
-
-  uint64 value;
-  do {
-    value = base::RandUint64();
-  } while (value > max_acceptable_value);
-
-  return value % range;
-}
-
-std::string RandBytesAsString(size_t length) {
-  DCHECK_GT(length, 0u);
-  std::string result;
-  RandBytes(WriteInto(&result, length + 1), length);
-  return result;
-}
-
-}  // namespace base