Function clsparseHeaderfromFile

src/library/io/mm-reader.cpp:440–467

This function reads the file header at the given filepath, and returns the size of the sparse matrix in the clsparseCooMatrix parameter. Post-condition: clears clsparseCooMatrix, then sets pCooMatx->m, pCooMatx->n pCooMatx->nnz

// Post-condition: clears clsparseCooMatrix, then sets pCooMatx->m, pCooMatx->n
// pCooMatx->nnz
clsparseStatus
clsparseHeaderfromFile( clsparseIdx_t* nnz, clsparseIdx_t* row, clsparseIdx_t* col, const char* filePath )
{

    // Check that the file format is matrix market; the only format we can read right now
    // This is not a complete solution, and fails for directories with file names etc...
    // TODO: Should we use boost filesystem?
    std::string strPath( filePath );
    if( strPath.find_last_of( '.' ) != std::string::npos )
    {
        std::string ext = strPath.substr( strPath.find_last_of( '.' ) + 1 );
        if( ext != "mtx" )
            return clsparseInvalidFileFormat;
    }
    else
        return clsparseInvalidFileFormat;

    MatrixMarketReader< cl_float > mm_reader;

    if( mm_reader.MMReadHeader( filePath ) )
        return clsparseInvalidFile;

    *row = mm_reader.GetNumRows( );
    *col = mm_reader.GetNumCols( );
    *nnz = mm_reader.GetNumNonZeroes( );

    return clsparseSuccess;
}

// This function reads the file at the given filepath, and returns the sparse
// matrix in the COO struct.  All matrix data is written to device memory