| /* |
| * Copyright (c) 2016-2018, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file implements MAC Channel Mask. |
| */ |
| |
| #include "channel_mask.hpp" |
| |
| #include "common/code_utils.hpp" |
| #include "common/random.hpp" |
| |
| namespace ot { |
| namespace Mac { |
| |
| uint8_t ChannelMask::GetNumberOfChannels(void) const |
| { |
| uint8_t num = 0; |
| uint8_t channel = kChannelIteratorFirst; |
| |
| while (GetNextChannel(channel) == OT_ERROR_NONE) |
| { |
| num++; |
| } |
| |
| return num; |
| } |
| |
| otError ChannelMask::GetNextChannel(uint8_t &aChannel) const |
| { |
| otError error = OT_ERROR_NOT_FOUND; |
| |
| if (aChannel == kChannelIteratorFirst) |
| { |
| aChannel = (Radio::kChannelMin - 1); |
| } |
| |
| for (aChannel++; aChannel <= Radio::kChannelMax; aChannel++) |
| { |
| if (ContainsChannel(aChannel)) |
| { |
| ExitNow(error = OT_ERROR_NONE); |
| } |
| } |
| |
| exit: |
| return error; |
| } |
| |
| uint8_t ChannelMask::ChooseRandomChannel(void) const |
| { |
| uint8_t channel = kChannelIteratorFirst; |
| uint8_t randomIndex; |
| |
| VerifyOrExit(!IsEmpty()); |
| |
| randomIndex = Random::NonCrypto::GetUint8InRange(0, GetNumberOfChannels()); |
| |
| SuccessOrExit(GetNextChannel(channel)); |
| |
| while (randomIndex-- != 0) |
| { |
| SuccessOrExit(GetNextChannel(channel)); |
| } |
| |
| exit: |
| return channel; |
| } |
| |
| ChannelMask::InfoString ChannelMask::ToString(void) const |
| { |
| InfoString string; |
| uint8_t channel = kChannelIteratorFirst; |
| bool addComma = false; |
| otError error; |
| |
| string.Append("{"); |
| |
| error = GetNextChannel(channel); |
| |
| while (error == OT_ERROR_NONE) |
| { |
| uint8_t rangeStart = channel; |
| uint8_t rangeEnd = channel; |
| |
| while ((error = GetNextChannel(channel)) == OT_ERROR_NONE) |
| { |
| if (channel != rangeEnd + 1) |
| { |
| break; |
| } |
| |
| rangeEnd = channel; |
| } |
| |
| string.Append("%s%d", addComma ? ", " : " ", rangeStart); |
| addComma = true; |
| |
| if (rangeStart < rangeEnd) |
| { |
| string.Append("%s%d", rangeEnd == rangeStart + 1 ? ", " : "-", rangeEnd); |
| } |
| } |
| |
| string.Append("}"); |
| |
| return string; |
| } |
| |
| } // namespace Mac |
| } // namespace ot |