| /* |
| * Copyright (c) 2021, 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 the `Appender` class. |
| */ |
| |
| #include "appender.hpp" |
| |
| namespace ot { |
| |
| Appender::Appender(Message &aMessage) |
| : mType(kMessage) |
| { |
| mShared.mMessage.mMessage = &aMessage; |
| mShared.mMessage.mStartOffset = aMessage.GetLength(); |
| } |
| |
| Appender::Appender(uint8_t *aBuffer, uint16_t aSize) |
| : mType(kBuffer) |
| { |
| mShared.mBuffer.mStart = aBuffer; |
| mShared.mBuffer.mCur = aBuffer; |
| mShared.mBuffer.mEnd = aBuffer + aSize; |
| } |
| |
| Error Appender::AppendBytes(const void *aBuffer, uint16_t aLength) |
| { |
| Error error = kErrorNone; |
| |
| switch (mType) |
| { |
| case kMessage: |
| error = mShared.mMessage.mMessage->AppendBytes(aBuffer, aLength); |
| break; |
| |
| case kBuffer: |
| VerifyOrExit(aLength <= static_cast<uint16_t>(mShared.mBuffer.mEnd - mShared.mBuffer.mCur), |
| error = kErrorNoBufs); |
| memcpy(mShared.mBuffer.mCur, aBuffer, aLength); |
| mShared.mBuffer.mCur += aLength; |
| break; |
| } |
| |
| exit: |
| return error; |
| } |
| |
| uint16_t Appender::GetAppendedLength(void) const |
| { |
| uint16_t length = 0; |
| |
| switch (mType) |
| { |
| case kMessage: |
| length = mShared.mMessage.mMessage->GetLength() - mShared.mMessage.mStartOffset; |
| break; |
| |
| case kBuffer: |
| length = static_cast<uint16_t>(mShared.mBuffer.mCur - mShared.mBuffer.mStart); |
| break; |
| } |
| |
| return length; |
| } |
| |
| void Appender::GetAsData(Data<kWithUint16Length> &aData) |
| { |
| aData.Init(mShared.mBuffer.mStart, GetAppendedLength()); |
| } |
| |
| } // namespace ot |