14 files changed, 140 insertions, 68 deletions

diff --git a/TODO_COORDINATES b/TODO_COORDINATES
index 78ed704..5aa0544 100644
--- a/TODO_COORDINATES
+++ b/TODO_COORDINATES
@@ -1,4 +1,5 @@
 - coord solver
+  - add checkdata for coord
   - return to fully qualified solver name
     x undo chnages to API
     - add a parameter to gendata to get a shortname (filename) for the table
@@ -30,3 +31,4 @@
 
 - refactor common parts of coord and h48 solvers
 - move parse_h48 to h48 module?
+  then maybe do like for coordinate and exclude the "h48" part
diff --git a/python/nissy_module.c b/python/nissy_module.c
index 29facc4..db63dbb 100644
--- a/python/nissy_module.c
+++ b/python/nissy_module.c
@@ -219,27 +219,33 @@ getcube(PyObject *self, PyObject *args)
         return string_result(err, result);
 }
 
-PyDoc_STRVAR(datasize_doc,
-"datasize(solver)\n"
+PyDoc_STRVAR(solverinfo_doc,
+"solverinfo(solver)\n"
 "--\n\n"
-"Returns the size of the data (pruning table) for the given solver\n"
+"Returns the size and the short name of the data for the given solver\n"
 "\n"
 "Parameters:\n"
 "  - solver: the name of the solver\n"
 "\n"
-"Returns: the size of the data for the solver, in bytes\n"
+"Returns: a pair containing the size and the short name "
+"of the data for the solver, in bytes\n"
 );
 static PyObject *
-datasize(PyObject *self, PyObject *args)
+solverinfo(PyObject *self, PyObject *args)
 {
         long long result;
         const char *solver;
+        char buf[NISSY_DATAID_SIZE];
+        PyObject *py_result, *py_buf;
 
         if (!PyArg_ParseTuple(args, "s", &solver))
                 return NULL;
 
-        result = nissy_datasize(solver);
-        return long_result(result);
+        result = nissy_solverinfo(solver, buf);
+        
+        py_result = PyLong_FromLong(result);
+        py_buf = PyUnicode_FromString(buf);
+        return PyTuple_Pack(2, py_result, py_buf);
 }
 
 PyDoc_STRVAR(gendata_doc,
@@ -257,12 +263,12 @@ gendata(PyObject *self, PyObject *args)
 {
         long long size, err;
         const char *solver;
-        char *buf;
+        char *buf, dataid[NISSY_DATAID_SIZE];
 
         if (!PyArg_ParseTuple(args, "s", &solver))
                 return NULL;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
         if (!check_error(size))
                 return NULL;
 
@@ -394,7 +400,7 @@ static PyMethodDef nissy_methods[] = {
         { "applytrans", applytrans, METH_VARARGS, applytrans_doc },
         { "convert", convert, METH_VARARGS, convert_doc },
         { "getcube", getcube, METH_VARARGS, getcube_doc },
-        { "datasize", datasize, METH_VARARGS, datasize_doc },
+        { "solverinfo", solverinfo, METH_VARARGS, solverinfo_doc },
         { "gendata", gendata, METH_VARARGS, gendata_doc },
         { "checkdata", checkdata, METH_VARARGS, checkdata_doc },
         { "solve", solve, METH_VARARGS, solve_doc },
diff --git a/shell/shell.c b/shell/shell.c
index 2a1a8cd..0387856 100644
--- a/shell/shell.c
+++ b/shell/shell.c
@@ -65,7 +65,7 @@ static int64_t applytrans_exec(args_t *);
 static int64_t frommoves_exec(args_t *);
 static int64_t convert_exec(args_t *);
 static int64_t randomcube_exec(args_t *);
-static int64_t datasize_exec(args_t *);
+static int64_t solverinfo_exec(args_t *);
 static int64_t gendata_exec(args_t *);
 static int64_t solve_exec(args_t *);
 static int64_t solve_scramble_exec(args_t *);
@@ -180,11 +180,11 @@ struct {
                 randomcube_exec
         ),
         COMMAND(
-                "datasize",
-                "datasize " FLAG_SOLVER " SOLVER",
-                "Return the size in bytes of the data table used by "
-                "SOLVER when called with the given OPTIONS.",
-                datasize_exec
+                "solverinfo",
+                "solverinfo " FLAG_SOLVER " SOLVER",
+                "Return the size in bytes and the id of the data table "
+                "used by SOLVER when called with the given OPTIONS.",
+                solverinfo_exec
         ),
         COMMAND(
                 "gendata",
@@ -340,14 +340,15 @@ randomcube_exec(args_t *args)
 }
 
 static int64_t
-datasize_exec(args_t *args)
+solverinfo_exec(args_t *args)
 {
         int64_t ret;
+        char buf[NISSY_DATAID_SIZE];
 
-        ret = nissy_datasize(args->str_solver);
+        ret = nissy_solverinfo(args->str_solver, buf);
         if (ret < 0)
                 fprintf(stderr, "Unknown error (make sure solver is valid)\n");
-        printf("%" PRId64 "\n", ret);
+        printf("%" PRId64 "\n%s\n", ret, buf);
 
         return ret;
 }
@@ -357,14 +358,22 @@ gendata_exec(args_t *args)
 {
         int i;
         FILE *file;
-        char *buf, path[MAX_PATH_LENGTH];
+        char *buf, path[MAX_PATH_LENGTH], dataid[NISSY_DATAID_SIZE];
         int64_t ret, size;
         size_t written;
 
+        size = nissy_solverinfo(args->str_solver, dataid);
+
+        if (size < 0) {
+                fprintf(stderr, "gendata: unknown solver %s\n",
+                    args->str_solver);
+                return -3;
+        }
+
         /* TODO: should give warning if overwriting existing file */
         for (i = 0; tablepaths[i] != NULL; i++) {
                 strcpy(path, tablepaths[i]);
-                strcat(path, args->str_solver);
+                strcat(path, dataid);
                 file = fopen(path, "wb");
                 if (file != NULL)
                         break;
@@ -376,16 +385,6 @@ gendata_exec(args_t *args)
                 return -2;
         }
 
-        size = nissy_datasize(args->str_solver);
-
-        if (size < 0) {
-                fprintf(stderr,
-                    "Unknown error in retrieving data size"
-                    "(make sure solver is valid)\n");
-                fclose(file);
-                return -3;
-        }
-
         buf = malloc(size);
 
         ret = nissy_gendata(args->str_solver, size, buf);
@@ -427,15 +426,24 @@ solve_exec(args_t *args)
         uint8_t nissflag;
         FILE *file;
         char *buf, solutions[SOLUTIONS_BUFFER_SIZE], path[MAX_PATH_LENGTH];
+        char dataid[NISSY_DATAID_SIZE];
         long long stats[NISSY_SIZE_SOLVE_STATS];
         int64_t ret, gendata_ret, size;
         size_t read;
 
         nissflag = NISSY_NISSFLAG_NORMAL; /* TODO: parse str_nisstype */
 
+        size = nissy_solverinfo(args->str_solver, dataid);
+
+        if (size < 0) {
+                fprintf(stderr, "solve: unknown solver %s\n",
+                    args->str_solver);
+                return size;
+        }
+
         for (i = 0; tablepaths[i] != NULL; i++) {
                 strcpy(path, tablepaths[i]);
-                strcat(path, args->str_solver);
+                strcat(path, dataid);
                 file = fopen(path, "rb");
                 if (file != NULL)
                         break;
@@ -454,7 +462,7 @@ solve_exec(args_t *args)
         if (file == NULL) {
                 for (i = 0; tablepaths[i] != NULL; i++) {
                         strcpy(path, tablepaths[i]);
-                        strcat(path, args->str_solver);
+                        strcat(path, dataid);
                         file = fopen(path, "rb");
                         if (file != NULL)
                                 break;
@@ -467,7 +475,6 @@ solve_exec(args_t *args)
                 return -1;
         }
 
-        size = nissy_datasize(args->str_solver);
         buf = malloc(size);
         read = fread(buf, size, 1, file);
         fclose(file);
diff --git a/src/nissy.c b/src/nissy.c
index eb483a0..2766b12 100644
--- a/src/nissy.c
+++ b/src/nissy.c
@@ -19,6 +19,7 @@ STATIC bool distribution_equal(const uint64_t [static INFO_DISTRIBUTION_LEN],
     const uint64_t [static INFO_DISTRIBUTION_LEN], uint8_t);
 STATIC long long write_result(cube_t, char [static NISSY_SIZE_B32]);
 STATIC size_t my_strnlen(const char *, size_t); 
+STATIC long long nissy_dataid(const char *, char [static NISSY_DATAID_SIZE]);
 STATIC long long nissy_gendata_unsafe(
     const char *, unsigned long long, char *);
 
@@ -412,11 +413,37 @@ nissy_datainfo(
         return NISSY_OK;
 }
 
+STATIC long long
+nissy_dataid(const char *solver, char dataid[static NISSY_DATAID_SIZE])
+{
+        if (!strncmp(solver, "h48", 3)) {
+                uint8_t h, k;
+                long long err;
+                if ((err = parse_h48_solver(solver, &h, &k)) != NISSY_OK)
+                        return err;
+                /* TODO: also check that h and k are admissible */
+                else strcpy(dataid, solver);
+                return err;
+                /* TODO: do this when moved parser */
+                /* return dataid_h48(solver, dataid); */
+        } else if (!strncmp(solver, "coord_", 6)) {
+                return dataid_coord(solver+6, dataid);
+        } else {
+                LOG("gendata: unknown solver %s\n", solver);
+                return NISSY_ERROR_INVALID_SOLVER;
+        }
+}
+
 long long
-nissy_datasize(
-        const char *solver
+nissy_solverinfo(
+        const char *solver,
+        char dataid[static NISSY_DATAID_SIZE]
 )
 {
+        long long err;
+        if ((err = nissy_dataid(solver, dataid)) != NISSY_OK)
+                return err;
+
         /* gendata() handles a NULL *data as a "dryrun" request */
         return nissy_gendata_unsafe(solver, 0, NULL);
 }
@@ -447,7 +474,7 @@ nissy_gendata_unsafe(
         }
 
         if ((size_t)data % 8 != 0) {
-                LOG("nissy_datainfo: buffere is not 8-byte aligned\n");
+                LOG("nissy_gendata: buffere is not 8-byte aligned\n");
                 return NISSY_ERROR_DATA;
         }
 
@@ -478,7 +505,7 @@ nissy_checkdata(
         int64_t err;
 
         if ((size_t)data % 8 != 0) {
-                LOG("nissy_datainfo: buffere is not 8-byte aligned\n");
+                LOG("nissy_checkdata: buffere is not 8-byte aligned\n");
                 return NISSY_ERROR_DATA;
         }
 
@@ -560,7 +587,7 @@ nissy_solve(
         }
 
         if ((size_t)data % 8 != 0) {
-                LOG("nissy_datainfo: buffere is not 8-byte aligned\n");
+                LOG("nissy_solve: buffere is not 8-byte aligned\n");
                 return NISSY_ERROR_DATA;
         }
 
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]
 );
 
 /*
diff --git a/src/solvers/coord/common.h b/src/solvers/coord/common.h
index f21a903..d570b6d 100644
--- a/src/solvers/coord/common.h
+++ b/src/solvers/coord/common.h
@@ -7,6 +7,7 @@ STATIC void append_coord_name(const coord_t *, char *);
 STATIC coord_t *parse_coord(const char *, int);
 STATIC uint8_t parse_axis(const char *, int);
 STATIC void parse_coord_and_axis(const char *, int, coord_t **, uint8_t *);
+STATIC int64_t dataid_coord(const char *, char [static NISSY_DATAID_SIZE]);
 
 STATIC void
 append_coord_name(const coord_t *coord, char *str)
@@ -61,3 +62,20 @@ parse_coord_and_axis(const char *str, int n, coord_t **coord, uint8_t *axis)
         if (axis != NULL)
                 *axis = i == n ? UINT8_ERROR : parse_axis(str+i+1, n-i-1);
 }
+
+STATIC int64_t
+dataid_coord(const char *ca, char dataid[static NISSY_DATAID_SIZE])
+{
+        coord_t *c;
+
+        parse_coord_and_axis(ca, strlen(ca), &c, NULL);
+
+        if (c == NULL) {
+                LOG("dataid_coord: cannot parse coordinate from '%s'\n", ca);
+                return NISSY_ERROR_INVALID_SOLVER;
+        }
+
+        strcpy(dataid, c->name);
+
+        return NISSY_OK;
+}
diff --git a/src/solvers/coord/types_macros.h b/src/solvers/coord/types_macros.h
index 594f594..84085ad 100644
--- a/src/solvers/coord/types_macros.h
+++ b/src/solvers/coord/types_macros.h
@@ -3,7 +3,7 @@
 #define COORD_MASK(i)  (UINT8_C(0xF) << COORD_SHIFT(i))
 
 typedef struct {
-        char name[255];
+        const char name[255];
         uint64_t (*coord)(cube_t, const void *);
         cube_t (*cube)(uint64_t, const void *);
         size_t (*gendata)(void *);
diff --git a/tools/000_gendata/gendata.c b/tools/000_gendata/gendata.c
index 213852f..51c2f47 100644
--- a/tools/000_gendata/gendata.c
+++ b/tools/000_gendata/gendata.c
@@ -8,9 +8,9 @@ static void
 run(void) {
         int64_t size;
         bool consistent, expected;
-        char *buf, filename[1024];
+        char *buf, filename[1024], dataid[NISSY_DATAID_SIZE];
         
-        size = generatetable(solver, &buf);
+        size = generatetable(solver, &buf, dataid);
         switch (size) {
         case -1:
                 return;
@@ -23,7 +23,7 @@ run(void) {
                 if (consistent && expected) {
                         printf("\n");
                         printf("Generated %" PRId64 " bytes.\n", size);
-                        sprintf(filename, "tables/%s", solver);
+                        sprintf(filename, "tables/%s", dataid);
                         writetable(buf, size, filename);
                 }
                 if (!consistent)
diff --git a/tools/100_checkdata/checkdata.c b/tools/100_checkdata/checkdata.c
index fe94427..8bc308c 100644
--- a/tools/100_checkdata/checkdata.c
+++ b/tools/100_checkdata/checkdata.c
@@ -6,13 +6,13 @@ char *solver, *filename;
 static void
 run(void) {
         long long int size, result;
-        char *buf;
+        char *buf, dataid[NISSY_DATAID_SIZE];
         FILE *f;
         
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
 
         if (size <= 0) {
-                printf("Error in datasize\n");
+                printf("Error in solverinfo\n");
                 return;
         }
 
diff --git a/tools/300_solve_small/solve_small.c b/tools/300_solve_small/solve_small.c
index 073de89..6a1f7b5 100644
--- a/tools/300_solve_small/solve_small.c
+++ b/tools/300_solve_small/solve_small.c
@@ -46,7 +46,7 @@ void run(void) {
 }
 
 int main(int argc, char **argv) {
-        char filename[255];
+        char filename[255], dataid[NISSY_DATAID_SIZE];
 
         if (argc < 2) {
                 printf("Error: not enough arguments. "
@@ -63,7 +63,7 @@ int main(int argc, char **argv) {
         if (getdata(solver, &buf, filename) != 0)
                 return 1;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
 
         timerun(run);
 
diff --git a/tools/301_solve_file/solve_file.c b/tools/301_solve_file/solve_file.c
index fe41bb7..cefc608 100644
--- a/tools/301_solve_file/solve_file.c
+++ b/tools/301_solve_file/solve_file.c
@@ -33,7 +33,7 @@ void run(void) {
 }
 
 int main(int argc, char **argv) {
-        char filename[255], *scrfilename;
+        char filename[255], dataid[NISSY_DATAID_SIZE], *scrfilename;
         FILE *scrfile;
 
         if (argc < 3) {
@@ -52,7 +52,7 @@ int main(int argc, char **argv) {
         if (getdata(solver, &buf, filename) != 0)
                 return 1;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
 
         if ((scrfile = fopen(scrfilename, "r")) == NULL) {
                 printf("Error: could not read given file '%s'.\n",
diff --git a/tools/302_solve_multisol/solve_multisol.c b/tools/302_solve_multisol/solve_multisol.c
index a03c2a0..c6ab685 100644
--- a/tools/302_solve_multisol/solve_multisol.c
+++ b/tools/302_solve_multisol/solve_multisol.c
@@ -39,7 +39,7 @@ void run(void) {
 }
 
 int main(int argc, char **argv) {
-        char filename[255];
+        char filename[255], dataid[NISSY_DATAID_SIZE];
 
         if (argc < 3) {
                 printf("Error: not enough arguments. "
@@ -57,7 +57,7 @@ int main(int argc, char **argv) {
         if (getdata(solver, &buf, filename) != 0)
                 return 1;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
 
         timerun(run);
 
diff --git a/tools/400_solvetest/solve_test.c b/tools/400_solvetest/solve_test.c
index 9b6c094..a98be26 100644
--- a/tools/400_solvetest/solve_test.c
+++ b/tools/400_solvetest/solve_test.c
@@ -94,7 +94,7 @@ void run(void) {
 }
 
 int main(int argc, char **argv) {
-        char filename[255];
+        char filename[255], dataid[NISSY_DATAID_SIZE];
 
         if (argc < 2) {
                 printf("Error: not enough arguments. "
@@ -110,7 +110,7 @@ int main(int argc, char **argv) {
         if (getdata(solver, &buf, filename) != 0)
                 return 1;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
 
         timerun(run);
 
diff --git a/tools/tool.h b/tools/tool.h
index 3488f34..b65f33a 100644
--- a/tools/tool.h
+++ b/tools/tool.h
@@ -13,7 +13,8 @@ static void log_stderr(const char *, ...);
 static void log_stdout(const char *, ...);
 static double timerun(void (*)(void));
 static void writetable(const char *, int64_t, const char *);
-static long long int generatetable(const char *, char **);
+static long long int generatetable(const char *, char **,
+    char [static NISSY_DATAID_SIZE]);
 static long long int derivetable(
     const char *, const char *, const char *, char **);
 static int getdata(const char *, char **, const char *);
@@ -86,11 +87,15 @@ writetable(const char *buf, int64_t size, const char *filename)
 }
 
 static long long int
-generatetable(const char *solver, char **buf)
+generatetable(
+        const char *solver,
+        char **buf,
+        char dataid[static NISSY_DATAID_SIZE]
+)
 {
         long long int size, gensize;
 
-        size = nissy_datasize(solver);
+        size = nissy_solverinfo(solver, dataid);
         if (size < 0) {
                 printf("Error getting table size.\n");
                 return -1;
@@ -120,7 +125,7 @@ derivetable(
 {
         uint8_t h, k;
         long long int size, gensize;
-        char *fulltable;
+        char *fulltable, dataid[NISSY_DATAID_SIZE];
 
         if (getdata(solver_large, &fulltable, filename_large) != 0) {
                 printf("Error reading full table.\n");
@@ -128,7 +133,7 @@ derivetable(
                 goto derivetable_error_nofree;
         }
 
-        size = nissy_datasize(solver_small);
+        size = nissy_solverinfo(solver_small, dataid);
         if (size == -1) {
                 printf("Error getting table size.\n");
                 gensize = -2;
@@ -164,10 +169,11 @@ getdata(
 ) {
         long long int size, sizeread;
         FILE *f;
+        char dataid[NISSY_DATAID_SIZE];
 
         if ((f = fopen(filename, "rb")) == NULL) {
                 printf("Table file not found, generating it.\n");
-                size = generatetable(solver, buf);
+                size = generatetable(solver, buf, dataid);
                 switch (size) {
                 case -1:
                         goto getdata_error_nofree;
@@ -179,7 +185,7 @@ getdata(
                 }
         } else {
                 printf("Reading tables from file %s\n", filename);
-                size = nissy_datasize(solver);
+                size = nissy_solverinfo(solver, dataid);
                 *buf = malloc(size);
                 sizeread = fread(*buf, size, 1, f);
                 fclose(f);
@@ -203,10 +209,10 @@ gendata_run(
         uint64_t expected[static 21]
 ) {
         long long int size;
-        char *buf, filename[1024];
+        char *buf, filename[1024], dataid[NISSY_DATAID_SIZE];
 
-        sprintf(filename, "tables/%s", solver);
-        size = generatetable(solver, &buf);
+        size = generatetable(solver, &buf, dataid);
+        sprintf(filename, "tables/%s", dataid);
         switch (size) {
         case -1:
                 return;