src/app/util/message.cpp

/**
 *
 *    Copyright (c) 2020 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include <app/util/af.h>
#include <app/util/util.h>
#include <lib/core/CHIPEncoding.h>

using namespace chip;

uint8_t emberAfStringLength(const uint8_t * buffer)
{
    // The first byte specifies the length of the string.  A length of 0xFF means
    // the string is invalid and there is no character data.
    return (buffer[0] == 0xFF ? 0 : buffer[0]);
}

uint16_t emberAfLongStringLength(const uint8_t * buffer)
{
    // The first two bytes specify the length of the long string.  A length of
    // 0xFFFF means the string is invalid and there is no character data.
    uint16_t length = Encoding::LittleEndian::Get16(buffer);
    return (length == 0xFFFF ? 0 : length);
}