resistancemonitor/4.Data/LNBuffer.cpp

#include "stdafx.h"
#include "LNBuffer.h"
#include <Simplelog.h>
#include <string>
#include "LNContext.h"

CLNBuffer::CLNBuffer()
{
}


CLNBuffer::~CLNBuffer()
{
}

int CLNBuffer::HasPack()
{
    if (m_nPos < 4) return 0;

    int i, nStart = -1;

    //find pack head
    for (i = 0; i < m_nPos - 1; i++)
    {
        if (m_pBuffer[i] == '{')
        {
            nStart = i;
            break;
        }
    }

    if (nStart == -1)
    {
        CString imei;
        if (pContext) if (((CLNContext*)pContext)->m_mapImei.size()) imei = ((CLNContext*)pContext)->m_mapImei.begin()->first;
        CSimpleLog::Error(fmt::format("[设备]{}未找到7B丢弃数据{}:({}){}", imei, m_nPos,
            CString((char*)m_pBuffer, m_nPos), CSimpleLog::GetHexString(m_pBuffer, m_nPos)).c_str());
        m_nPos = 0;
        return 0;
    }
    else if (nStart > 0)
    {
		CString imei;
		if (pContext) if (((CLNContext*)pContext)->m_mapImei.size()) imei = ((CLNContext*)pContext)->m_mapImei.begin()->first;
		CSimpleLog::Error(fmt::format("[设备]{}找到7B丢弃7B之前的数据{}:({}){}", imei, nStart,
            CString((char*)m_pBuffer, nStart), CSimpleLog::GetHexString(m_pBuffer, nStart)).c_str());
        m_nPos -= nStart;
        memmove(m_pBuffer, m_pBuffer + nStart, m_nPos);
        nStart = 0;
    }

    int nlen = 0;
    //find pack tail
    for (i = 1; i < m_nPos; i++)
    {
        if (m_pBuffer[i] == '{')
        {
			CString imei;
			if (pContext) if (((CLNContext*)pContext)->m_mapImei.size()) imei = ((CLNContext*)pContext)->m_mapImei.begin()->first;
			CSimpleLog::Error(fmt::format("[设备]{}找7D丢弃7B之前的数据{}:({}){}", imei, i,
                CString((char*)m_pBuffer, i), CSimpleLog::GetHexString(m_pBuffer, i)).c_str());
            m_nPos -= i;
            memmove(m_pBuffer, m_pBuffer + i, m_nPos);
            nStart = 0;
            return 0;
        }

        if (m_pBuffer[i] == '}')
        {
            nlen = i + 1;
            return nlen;
        }
    }

    return nlen;
}