Function icvReadMatND

deps/opencv/modules/core/src/persistence.cpp:3657–3708

static void*
icvReadMatND( CvFileStorage* fs, CvFileNode* node )
{
    void* ptr = 0;
    CvMatND* mat;
    const char* dt;
    CvFileNode* data;
    CvFileNode* sizes_node;
    int sizes[CV_MAX_DIM], dims, elem_type;
    int i, total_size;

    sizes_node = cvGetFileNodeByName( fs, node, "sizes" );
    dt = cvReadStringByName( fs, node, "dt", 0 );

    if( !sizes_node || !dt )
        CV_Error( CV_StsError, "Some of essential matrix attributes are absent" );

    dims = CV_NODE_IS_SEQ(sizes_node->tag) ? sizes_node->data.seq->total :
           CV_NODE_IS_INT(sizes_node->tag) ? 1 : -1;

    if( dims <= 0 || dims > CV_MAX_DIM )
        CV_Error( CV_StsParseError, "Could not determine the matrix dimensionality" );

    cvReadRawData( fs, sizes_node, sizes, "i" );
    elem_type = icvDecodeSimpleFormat( dt );

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



    for( total_size = CV_MAT_CN(elem_type), i = 0; i < dims; i++ )
        total_size *= sizes[i];

    int nelems = icvFileNodeSeqLen( data );

    if( nelems > 0 && nelems != total_size )
        CV_Error( CV_StsUnmatchedSizes,
                 "The matrix size does not match to the number of stored elements" );

    if( nelems > 0 )
    {
        mat = cvCreateMatND( dims, sizes, elem_type );
        cvReadRawData( fs, data, mat->data.ptr, dt );
    }
    else
        mat = cvCreateMatNDHeader( dims, sizes, elem_type );

    ptr = mat;
    return ptr;
}


/******************************* CvSparseMat ******************************/