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


CLNBuffer::CLNBuffer()
{
}


CLNBuffer::~CLNBuffer()
{
}

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

    int i, nStart = -1;

    //find pack head
    for (i = 0; i < m_nPos - 1 && m_nPos > 4; i++)
    {
        if (m_pBuffer[i] == '{')
        {
            nStart = i;
            break;
        }
    }

    if (nStart == -1)
    {
        m_nPos = 0;
        return 0;
    }
    else if (nStart > 0)
    {
        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] == '{')
        {
            m_nPos -= i;
            memmove(m_pBuffer, m_pBuffer + i, m_nPos);
            nStart = 0;
            return nlen;
        }

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

    return nlen;
}