bool OTA_CBOR_Decode_GetStreamResponseMessage()

in source/ota_cbor.c [74:216]
116 lines of code
25 McCabe index (conditional complexity)

bool OTA_CBOR_Decode_GetStreamResponseMessage( const uint8_t * pMessageBuffer,
                                               size_t messageSize,
                                               int32_t * pFileId,
                                               int32_t * pBlockId,
                                               int32_t * pBlockSize,
                                               uint8_t ** pPayload,
                                               size_t * pPayloadSize )
{
    CborError cborResult = CborNoError;
    CborParser cborParser;
    CborValue cborValue, cborMap;
    size_t payloadSizeReceived = 0;

    if( ( pFileId == NULL ) ||
        ( pBlockId == NULL ) ||
        ( pBlockSize == NULL ) ||
        ( pPayload == NULL ) ||
        ( pPayloadSize == NULL ) ||
        ( pMessageBuffer == NULL ) )
    {
        cborResult = CborUnknownError;
    }

    /* Initialize the parser. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_parser_init( pMessageBuffer,
                                       messageSize,
                                       0,
                                       &cborParser,
                                       &cborMap );
    }

    /* Get the outer element and confirm that it's a "map," i.e., a set of
     * CBOR key/value pairs. */
    if( CborNoError == cborResult )
    {
        if( false == cbor_value_is_map( &cborMap ) )
        {
            cborResult = CborErrorIllegalType;
        }
    }

    /* Find the file ID. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_map_find_value( &cborMap,
                                                OTA_CBOR_FILEID_KEY,
                                                &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = checkDataType( CborIntegerType, &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_get_int( &cborValue,
                                         ( int * ) pFileId );
    }

    /* Find the block ID. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_map_find_value( &cborMap,
                                                OTA_CBOR_BLOCKID_KEY,
                                                &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = checkDataType( CborIntegerType, &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_get_int( &cborValue,
                                         ( int * ) pBlockId );
    }

    /* Find the block size. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_map_find_value( &cborMap,
                                                OTA_CBOR_BLOCKSIZE_KEY,
                                                &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = checkDataType( CborIntegerType, &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_get_int( &cborValue,
                                         ( int * ) pBlockSize );
    }

    /* Find the payload bytes. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_map_find_value( &cborMap,
                                                OTA_CBOR_BLOCKPAYLOAD_KEY,
                                                &cborValue );
    }

    if( CborNoError == cborResult )
    {
        cborResult = checkDataType( CborByteStringType, &cborValue );
    }

    /* Calculate the size we need to malloc for the payload. */
    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_calculate_string_length( &cborValue,
                                                         &payloadSizeReceived );
    }

    if( CborNoError == cborResult )
    {
        /* Check if the received payload size is less than or equal to buffer size. */
        if( payloadSizeReceived <= ( *pPayloadSize ) )
        {
            *pPayloadSize = payloadSizeReceived;
        }
        else
        {
            cborResult = CborErrorOutOfMemory;
        }
    }

    if( CborNoError == cborResult )
    {
        cborResult = cbor_value_copy_byte_string( &cborValue,
                                                  *pPayload,
                                                  pPayloadSize,
                                                  NULL );
    }

    return CborNoError == cborResult;
}