1 files changed, 10 insertions, 4 deletions

diff --git a/src/nissy.h b/src/nissy.h
index 6c5a3e6..23bcb8b 100644
--- a/src/nissy.h
+++ b/src/nissy.h
@@ -25,6 +25,7 @@ for example 'rotation UF' or 'mirrored BL'.
 #define NISSY_SIZE_H48            88U
 #define NISSY_SIZE_TRANSFORMATION 12U
 #define NISSY_SIZE_SOLVE_STATS    10U
+#define NISSY_DATAID_SIZE         255U
 
 /* Flags for NISS options */
 #define NISSY_NISSFLAG_NORMAL  1U
@@ -191,11 +192,15 @@ nissy_getcube(
 );
 
 /*
-Compute the size of the data generated by nissy_gendata, when called with
-the same parameters, or -1 in case of error.
+Compute the size of the data generated by nissy_gendata when called for
+the given solver, and other useful information.
 
 Parameters:
    solver - The name of the solver.
+   dataid - An identifier for the data computed for the solver. Different
+            solver may use equivalent data. This identifier can be used
+            e.g. as a filename or database key to save and retrieve the
+            correct data for each solver, without duplication.
 
 Return values:
    NISSY_ERROR_INVALID_SOLVER - The given solver is not known.
@@ -204,8 +209,9 @@ Return values:
    Any value >= 0             - The size of the data, in bytes.
 */
 long long
-nissy_datasize(
-        const char *solver
+nissy_solverinfo(
+        const char *solver,
+        char dataid[static NISSY_DATAID_SIZE]
 );
 
 /*