svac parse tool

小工具，用于解析私有流和定位脏数据。

int CtestmfcDlg::parser()
{
    m_loc = 0;
    m_index = 0;
    m_count = 0;
    m_extendLen = 0;
    m_frameLen = 0;
    m_Len = 0;
    m_parserLen = 0;
    m_lastLoc = 0;

    long fileSize;
    CString str1;
    GetDlgItem(IDC_EDIT1)->GetWindowText(str1);
    string str2 = CT2A(str1);
    fp = fopen(str2.c_str(), "rb");
    if (fp == NULL)
    {
        TRACE("open file failed!\n");
        return 0;
    }
    fseek(fp, 0L, SEEK_END);
    fileSize = ftell(fp);
    rewind(fp);
    unsigned char *dataPtr= (unsigned char *)malloc((fileSize+1)*sizeof(unsigned char));
    fread(dataPtr, fileSize,1, fp);
    ParseData(dataPtr,fileSize);
    fclose(fp);

    return 0;
}

int CtestmfcDlg::ParseData(unsigned char *data, int len)
{
    if (data == NULL || len <= 0)
        return -1;
    m_code = 0xffffffff;
    m_falseLen = 0;
    m_bufptr = data;
    rest = len;
    m_list.DeleteAllItems();
    while (rest > 0)
    {
        m_code = m_code << 8 | *m_bufptr++;
        rest--;
        if (CheckSign(m_code) == true)
        {
            CString count_str,location_str,index_str,falseLen_str,m_Len_str,m_parserLen_str,m_frameRate_str,m_wh_str;
            count_str.Format(_T("%d"),m_count);
            location_str.Format(_T("%x"),m_loc-3);
            index_str.Format(_T("%x"),m_index);
            m_list.InsertItem(m_count,L"");
            m_list.SetItemText(m_count, 0, count_str);
            m_list.SetItemText(m_count, 1, location_str);
            m_list.SetItemText(m_count, 2, index_str);
            m_falseLen = (m_loc-3) - m_index;
            m_index += m_falseLen;
            if (ParseOneFrame() == false)
            {
                return 0;
            }
            if (m_falseLen<0)
            {
                m_falseLen = m_parserLen+m_falseLen;
            }
            if (m_falseLen!=0)
            {
                falseLen_str.Format(_T("%d"),m_falseLen);
                m_list.SetItemText(m_count, 5, falseLen_str);
            }
            m_Len = m_loc-m_lastLoc;
            m_Len_str.Format(_T("%d"),m_Len);
            m_list.SetItemText(m_count-1, 3, m_Len_str);
            m_parserLen_str.Format(_T("%d"),m_parserLen);
            m_list.SetItemText(m_count, 4, m_parserLen_str);
            m_list.SetItemText(m_count, 6, type(m_nType));
            if (m_nType==1)
            {
                m_list.SetItemText(m_count, 7, subType(m_nSubType));
                m_frameRate_str.Format(_T("%d"),m_nFrameRate);
                m_wh_str.Format(_T("%d*%d"),m_nWidth,m_nHeight);
                m_list.SetItemText(m_count, 8, m_frameRate_str);
                m_list.SetItemText(m_count, 9, m_wh_str);
            }
            m_count++;
            m_lastLoc = m_loc;
            if (m_falseLen>0)
            {
                m_list.SetItemColor(m_count-1,RGB(240,128,128));
            }
        }
        m_loc++;
    }
    if (rest==0)//最后一帧
    {
        m_Len = m_loc-m_lastLoc+3;
        CString m_Len_str;
        m_Len_str.Format(_T("%d"),m_Len);
        m_list.SetItemText(m_count-1, 3, m_Len_str);
        if (m_Len!=m_parserLen||m_falseLen>0)
        {
            m_list.SetItemColor(m_count-1,RGB(240,128,128));
        }
    }
    
    return 0;
}

bool CtestmfcDlg::CheckSign(const unsigned int& Code)
{
    if (Code == 0x01ED || Code == 0x01EC || Code == 0x01EA)
    {
        return true;
    }
    return false;
}

bool CtestmfcDlg::ParseOneFrame()
{   
    if (rest < 20)
        return false;
    
    if (m_code == 0x01ED)
    {
        m_nType = DH_FRAME_TYPE_VIDEO;
        m_nSubType = DH_FRAME_TYPE_VIDEO_I_FRAME;
    }
    else if (m_code == 0x01EC)
    {
        m_nType = DH_FRAME_TYPE_VIDEO;
        m_nSubType = DH_FRAME_TYPE_VIDEO_P_FRAME;
    }
    else if (m_code == 0x01EA)
    {
        m_nType = DH_FRAME_TYPE_AUDIO;
    }
    m_nFrameRate = m_bufptr[2] &0x1F;
    m_nWidth = m_bufptr[4] | m_bufptr[5]<<8;
    m_nHeight = m_bufptr[6] | m_bufptr[7]<<8;
    m_extendLen = (m_bufptr[14 ] & 0xFF) | ((m_bufptr[15 ] << 8 ) & 0xFF00);
    unsigned char* frameLenPtr = m_bufptr + m_extendLen;
    m_frameLen = frameLenPtr[19]<<24|frameLenPtr[18]<<16|frameLenPtr[17]<<8|frameLenPtr[16];
    m_parserLen = m_frameLen + 24 + m_extendLen;
    m_index += m_parserLen;
    
    return true;
}

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