C++ StrPtrLen::setPtrLen方法代码示例

OSCL_EXPORT_REF bool
RTSPOutgoingMessage::addField(
    StrCSumPtrLen * newFieldName,
    const StrPtrLen *    newFieldValue
)
{
    StrPtrLen * fieldVal = const_cast<StrPtrLen *>(queryField(* newFieldName));

    uint32  extraSize;

    // check if this field already exists in the message
    //
    if (NULL == fieldVal)
    { // this field is new to the message

        // check that there are enough pointers
        if (RTSP_MAX_NUMBER_OF_FIELDS == numPtrFields)
        {
            return false;
        }

        // check for the extra size
        extraSize = newFieldName->length() + newFieldValue->length() + 2;
        if (RTSP_MAX_FULL_REQUEST_SIZE < secondaryBufferSizeUsed + extraSize)
        {
            return false;
        }

        // oscl_memcpy is unsafe for overlaps, but source and target memory come from
        // different sources
        //
        oscl_memcpy(secondaryBufferSpace, newFieldName->c_str(),
                    newFieldName->length() + 1);
        oscl_memcpy(secondaryBufferSpace + newFieldName->length() + 1,
                    newFieldValue->c_str(), newFieldValue->length() + 1);

        // save the incoming structures, but reset pointers to their new home in the
        // secondary buffer

        fieldKeys[ numPtrFields ].setPtrLen(secondaryBufferSpace,
                                            newFieldName->length());
        fieldVals[ numPtrFields ].setPtrLen(
            secondaryBufferSpace + newFieldName->length() + 1,
            newFieldValue->length()
        );

        // pop up the number of used pointers
        //
        ++ numPtrFields;

        // do buffer accounting
        //
    }
    else
    { // this field is known to the message, we just have to replace its value

        // check for the extra size
        extraSize = newFieldValue->length() + 1;
        if (RTSP_MAX_FULL_REQUEST_SIZE < secondaryBufferSizeUsed + extraSize)
        {
            return false;
        }

        // oscl_memcpy is unsafe for overlaps, but source and target memory come from
        // different sources
        //
        oscl_memcpy(secondaryBufferSpace, newFieldValue->c_str(),
                    newFieldValue->length() + 1);

        // save the incoming structures, but reset pointers to their new home in the
        // secondary buffer

        fieldVal->setPtrLen(secondaryBufferSpace, newFieldValue->length());
    }

    secondaryBufferSizeUsed += extraSize;
    secondaryBufferSpace = secondaryBuffer + secondaryBufferSizeUsed;

    return true;
}