diff -rupN a/src/farray.c b/src/farray.c
--- a/src/farray.c	2013-12-25 20:27:20.000000000 +0800
+++ b/src/farray.c	2026-09-06 16:47:25.271850246 +0800
@@ -440,7 +440,7 @@ int farray_get_fixed(farray_t *fa)
  * @param fa Array of feature vectors
  * @param z Stream pointer
  */
-void farray_save(farray_t *fa, gzFile * z)
+void farray_save(farray_t *fa, gzFile z)
 {
     assert(fa && z);
     int i;
@@ -474,7 +474,7 @@ char *farray_get_label(farray_t *fa, int
  * @param z Stream point
  * @return  Array of feature vectors
 */
-farray_t *farray_load(gzFile * z)
+farray_t *farray_load(gzFile z)
 {
     assert(z);
     char buf[512], str[512];
@@ -531,7 +531,7 @@ farray_t *farray_load(gzFile * z)
 void farray_save_file(farray_t *fa, char *f)
 {
     assert(fa && f);
-    gzFile *z;
+    gzFile z;
 
     if (verbose > 0)
         printf("Saving %lu feature vectors to '%s'.\n", fa->len, f);
@@ -556,7 +556,7 @@ void farray_save_file(farray_t *fa, char
 void farray_append_file(farray_t *fa, char *f)
 {
     assert(fa && f);
-    gzFile *z;
+    gzFile z;
 
     if (verbose > 0)
         printf("Appending %lu feature vectors to '%s'.\n", fa->len, f);
@@ -593,7 +593,7 @@ farray_t *farray_load_file(char *f)
         printf("Load feature vectors from '%s'.\n", f);
 
     /* Open file */
-    gzFile *z = gzopen(f, "rb");
+    gzFile z = gzopen(f, "rb");
     if (!z) {
         error("Could not open '%s' for reading", f);
         return NULL;
diff -rupN a/src/farray.h b/src/farray.h
--- a/src/farray.h	2013-12-25 20:27:20.000000000 +0800
+++ b/src/farray.h	2026-09-06 16:47:25.272795788 +0800
@@ -69,10 +69,10 @@ farray_t *farray_extract_dir(char *);
 farray_t *farray_extract_archive(char *);
 
 /* I/O functions */
-void farray_save(farray_t *, gzFile *);
+void farray_save(farray_t *, gzFile);
 void farray_save_file(farray_t *, char *);
 void farray_append_file(farray_t *, char *);
-farray_t *farray_load(gzFile *);
+farray_t *farray_load( gzFile);
 farray_t *farray_load_file(char *);
 
 #endif                          /* FARRAY_H */
diff -rupN a/src/ftable.c b/src/ftable.c
--- a/src/ftable.c	2013-12-25 20:27:20.000000000 +0800
+++ b/src/ftable.c	2026-09-06 16:47:25.273562757 +0800
@@ -186,7 +186,7 @@ unsigned long ftable_size()
  * Saves a feature table to a file stream.
  * @param z Stream pointer
  */
-void ftable_save(gzFile * z)
+void ftable_save(gzFile z)
 {
     fentry_t *f;
     int i;
@@ -208,7 +208,7 @@ void ftable_save(gzFile * z)
  * Loads a feature table from a file stream (Not synchronized)
  * @param z Stream pointer
  */
-void ftable_load(gzFile * z)
+void ftable_load(gzFile z)
 {
     int i, r;
     unsigned long len;
diff -rupN a/src/ftable.h b/src/ftable.h
--- a/src/ftable.h	2013-12-25 20:27:20.000000000 +0800
+++ b/src/ftable.h	2026-09-06 16:47:25.274462612 +0800
@@ -44,8 +44,8 @@ void ftable_destroy();
 unsigned long ftable_size();
 void ftable_print();
 void ftable_remove(feat_t);
-void ftable_save(gzFile * z);
-void ftable_load(gzFile * z);
+void ftable_save(gzFile z);
+void ftable_load(gzFile z);
 int ftable_enabled();
 
 #endif                          /* FTABLE_H */
diff -rupN a/src/fvec.c b/src/fvec.c
--- a/src/fvec.c	2013-12-25 20:27:20.000000000 +0800
+++ b/src/fvec.c	2026-09-06 16:47:25.269862523 +0800
@@ -523,7 +523,7 @@ static void decode_delim(const char *s)
  * @param f Feature vector
  * @param z Stream pointer
  */
-void fvec_save(fvec_t *f, gzFile * z)
+void fvec_save(fvec_t *f, gzFile z)
 {
     assert(f && z);
     int i;
@@ -541,7 +541,7 @@ void fvec_save(fvec_t *f, gzFile * z)
  * @param z Stream point
  * @return Feature vector
  */
-fvec_t *fvec_load(gzFile * z)
+fvec_t *fvec_load(gzFile z)
 {
     assert(z);
     fvec_t *f;
diff -rupN a/src/fvec.h b/src/fvec.h
--- a/src/fvec.h	2013-12-25 20:27:20.000000000 +0800
+++ b/src/fvec.h	2026-09-06 16:47:25.271039533 +0800
@@ -45,8 +45,8 @@ fvec_t *fvec_extract(char *, int l, char
 void fvec_destroy(fvec_t *);
 fvec_t *fvec_clone(fvec_t *);
 void fvec_print(fvec_t *);
-void fvec_save(fvec_t *, gzFile *);
-fvec_t *fvec_load(gzFile *);
+void fvec_save(fvec_t *, gzFile);
+fvec_t *fvec_load( gzFile);
 void fvec_reset_delim();
 void fvec_realloc(fvec_t *);
 
diff -rupN a/tests/test_farray.c b/tests/test_farray.c
--- a/tests/test_farray.c	2013-12-25 20:27:20.000000000 +0800
+++ b/tests/test_farray.c	2026-09-06 16:48:48.109418476 +0800
@@ -114,7 +114,7 @@ int test_load_save()
 {
     int i, j, k, err = 0;
     char buf[STR_LENGTH + 1], label[32];
-    gzFile *z;
+    gzFile z;
 
     test_printf("Loading and saving of feature arrays");
 
diff -rupN a/tests/test_ftable.c b/tests/test_ftable.c
--- a/tests/test_ftable.c	2013-12-25 20:27:20.000000000 +0800
+++ b/tests/test_ftable.c	2026-09-06 16:48:48.107859300 +0800
@@ -124,7 +124,7 @@ int test_stress()
 int test_load_save()
 {
     int i, j, err = 0;
-    gzFile *z;
+    gzFile z;
     fentry_t *f;
 
     test_printf("Loading and saving of feature table");
diff -rupN a/tests/test_fvec.c b/tests/test_fvec.c
--- a/tests/test_fvec.c	2013-12-25 20:27:20.000000000 +0800
+++ b/tests/test_fvec.c	2026-09-06 16:48:48.106157083 +0800
@@ -159,7 +159,7 @@ int test_load_save()
 {
     int i, j, err = 0;
     fvec_t *f, *g;
-    gzFile *z;
+    gzFile z;
 
     test_printf("Loading and saving of feature vectors");