Function icvReadMat

deps/opencv/modules/core/src/persistence.cpp:3573–3612

static void*
icvReadMat( CvFileStorage* fs, CvFileNode* node )
{
    void* ptr = 0;
    CvMat* mat;
    const char* dt;
    CvFileNode* data;
    int rows, cols, elem_type;

    rows = cvReadIntByName( fs, node, "rows", -1 );
    cols = cvReadIntByName( fs, node, "cols", -1 );
    dt = cvReadStringByName( fs, node, "dt", 0 );

    if( rows < 0 || cols < 0 || !dt )
        CV_Error( CV_StsError, "Some of essential matrix attributes are absent" );

    elem_type = icvDecodeSimpleFormat( dt );

    data = cvGetFileNodeByName( fs, node, "data" );
    if( !data )
        CV_Error( CV_StsError, "The matrix data is not found in file storage" );

    int nelems = icvFileNodeSeqLen( data );
    if( nelems > 0 && nelems != rows*cols*CV_MAT_CN(elem_type) )
        CV_Error( CV_StsUnmatchedSizes,
                 "The matrix size does not match to the number of stored elements" );

    if( nelems > 0 )
    {
        mat = cvCreateMat( rows, cols, elem_type );
        cvReadRawData( fs, data, mat->data.ptr, dt );
    }
    else if( rows == 0 && cols == 0 )
        mat = cvCreateMatHeader( 0, 1, elem_type );
    else
        mat = cvCreateMatHeader( rows, cols, elem_type );

    ptr = mat;
    return ptr;
}


/******************************* CvMatND ******************************/