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+/*
+ * Copyright 2014-2015 Anton Khirnov <anton@khirnov.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef BRILL_DATA_INTERNAL_H
+#define BRILL_DATA_INTERNAL_H
+
+#include "brill_data.h"
+
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#define SQR(x) ((x) * (x))
+
+#define ARRAY_ELEMS(x) (sizeof(x) / sizeof(x[0]))
+
+/*
+ * small number to avoid r=0 singularities
+ */
+#define EPS 1E-08
+
+/* a set of basis functions */
+typedef struct BasisSet {
+    /* evaluate the idx-th basis function at the specified point*/
+    double (*eval)      (double coord, int idx, double sf);
+    /* evaluate the first derivative of the idx-th basis function at the specified point*/
+    double (*eval_diff1)(double coord, int idx, double sf);
+    /* evaluate the second derivative of the idx-th basis function at the specified point*/
+    double (*eval_diff2)(double coord, int idx, double sf);
+    /**
+     * Get the idx-th collocation point for the specified order.
+     * idx runs from 0 to order - 1 (inclusive)
+     */
+    double (*colloc_point)(int order, int idx, double sf);
+} BasisSet;
+
+typedef struct QFunc {
+    double         (*q)(const BDContext *bd, double rho, double z);
+    double    (*dq_rho)(const BDContext *bd, double rho, double z);
+    double      (*dq_z)(const BDContext *bd, double rho, double z);
+    double   (*d2q_rho)(const BDContext *bd, double rho, double z);
+    double     (*d2q_z)(const BDContext *bd, double rho, double z);
+    double (*d2q_rho_z)(const BDContext *bd, double rho, double z);
+} QFunc;
+
+typedef struct BDPriv {
+    const BasisSet *basis;
+    const QFunc    *q_func;
+
+    int nb_colloc_points;
+    int nb_colloc_points_rho;
+    int nb_colloc_points_z;
+
+    int colloc_grid_order_rho;
+    int colloc_grid_order_z;
+    int nb_coeffs;
+
+    double *coeffs;
+} BDPriv;
+
+extern const BasisSet bdi_sb_even_basis;
+
+extern const QFunc bdi_q_func_gundlach;
+extern const QFunc bdi_q_func_eppley;
+
+int bdi_solve(BDContext *bd);
+
+void bdi_log(const BDContext *bd, int level, const char *fmt, ...);
+void bdi_log_default_callback(const BDContext *bd, int level,
+                              const char *fmt, va_list vl);
+
+#endif // BRILL_DATA_INTERNAL_H