diff --git a/benchmarks/benchmark_assimp/main.cpp b/benchmarks/benchmark_assimp/main.cpp
index 0688863..2bc9d44 100644
--- a/benchmarks/benchmark_assimp/main.cpp
+++ b/benchmarks/benchmark_assimp/main.cpp
@@ -284,7 +284,7 @@ static void stl_read(const void* filepath)
     mesh_creator.func_add_triangle = add_triangle;
     mesh_creator.func_end_solid = end_solid;
 
-    const int error = gmio_stl_read_file(str_filepath, mesh_creator, NULL);
+    const int error = gmio_stl_read_file(str_filepath, &mesh_creator, NULL);
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
 
@@ -305,7 +305,7 @@ static void stl_write(const char* filepath, gmio_stl_format format)
     gmio_stl_write_options opts = {};
     opts.stla_float32_format = GMIO_FLOAT_TEXT_FORMAT_SHORTEST_UPPERCASE;
     opts.stla_float32_prec = 7;
-    const int error = gmio_stl_write_file(format, filepath, mesh, NULL);
+    const int error = gmio_stl_write_file(format, filepath, &mesh, NULL);
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
 }
diff --git a/benchmarks/benchmark_gmio/main.c b/benchmarks/benchmark_gmio/main.c
index 0d4b0d5..47b192c 100644
--- a/benchmarks/benchmark_gmio/main.c
+++ b/benchmarks/benchmark_gmio/main.c
@@ -52,7 +52,7 @@ static void bmk_gmio_stl_read(const void* filepath)
 
     mesh_creator.cookie = &cookie;
     mesh_creator.func_add_triangle = dummy_process_triangle;
-    error = gmio_stl_read_file(filepath, mesh_creator, NULL);
+    error = gmio_stl_read_file(filepath, &mesh_creator, NULL);
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
 }
@@ -143,7 +143,7 @@ static void stl_readwrite_flush_triangles(struct stl_readwrite_conv* rw_conv)
     options.stla_float32_format = GMIO_FLOAT_TEXT_FORMAT_SCIENTIFIC_LOWERCASE;
     options.stla_float32_prec = 6;
 
-    gmio_stl_write(rw_conv->out_format, rw_conv->stream, mesh, &options);
+    gmio_stl_write(rw_conv->out_format, &rw_conv->stream, &mesh, &options);
     rw_conv->triangle_pos = 0;
 }
 
@@ -205,7 +205,7 @@ static void bmk_gmio_stl_readwrite_conv(const void* filepath)
     mesh_creator.func_add_triangle = &readwrite_add_triangle;
     mesh_creator.func_end_solid = &readwrite_end_solid;
 
-    error = gmio_stl_read(instream, mesh_creator, NULL);
+    error = gmio_stl_read(&instream, &mesh_creator, NULL);
 
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
@@ -220,9 +220,9 @@ void bmk_gmio_stl_infos_get_all(const void* filepath)
     FILE* file = fopen(filepath, "rb");
 
     if (file != NULL) {
-        const struct gmio_stream stream = gmio_stream_stdio(file);
+        struct gmio_stream stream = gmio_stream_stdio(file);
         struct gmio_stl_infos infos = {0};
-        gmio_stl_infos_get(&infos, stream, GMIO_STL_INFO_FLAG_ALL, NULL);
+        gmio_stl_infos_get(&infos, &stream, GMIO_STL_INFO_FLAG_ALL, NULL);
 
         if (!already_exec) {
             printf("stl_infos_get(ALL)\n"
@@ -253,9 +253,9 @@ void bmk_gmio_stl_infos_get_size(const void* filepath)
     FILE* file = fopen(filepath, "rb");
 
     if (file != NULL) {
-        const struct gmio_stream stream = gmio_stream_stdio(file);
+        struct gmio_stream stream = gmio_stream_stdio(file);
         struct gmio_stl_infos infos = {0};
-        gmio_stl_infos_get(&infos, stream, GMIO_STL_INFO_FLAG_SIZE, NULL);
+        gmio_stl_infos_get(&infos, &stream, GMIO_STL_INFO_FLAG_SIZE, NULL);
 
         if (!already_exec) {
             printf("stl_infos_get(SIZE)\n"
diff --git a/benchmarks/benchmark_opencascade/main.cpp b/benchmarks/benchmark_opencascade/main.cpp
index e7cfd03..1988da2 100644
--- a/benchmarks/benchmark_opencascade/main.cpp
+++ b/benchmarks/benchmark_opencascade/main.cpp
@@ -58,11 +58,10 @@ Handle_StlMesh_Mesh stlMesh;
 
 static void stl_read(const void* filepath)
 {
+    gmio_stl_mesh_creator mesh_creator = gmio_stl_occmesh_creator(stlMesh);
     stlMesh = new StlMesh_Mesh;
     const int error = gmio_stl_read_file(
-                static_cast<const char*>(filepath),
-                gmio_stl_occmesh_creator(stlMesh),
-                NULL);
+                static_cast<const char*>(filepath), &mesh_creator, NULL);
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
 }
@@ -72,12 +71,9 @@ static void stl_write(const char* filepath, gmio_stl_format format)
     gmio_stl_write_options options = {};
     options.stla_float32_format = GMIO_FLOAT_TEXT_FORMAT_SHORTEST_UPPERCASE;
     options.stla_float32_prec = 7;
-    const int error =
-            gmio_stl_write_file(
-                format,
-                static_cast<const char*>(filepath),
-                gmio_stl_occmesh(stlMesh),
-                &options);
+    gmio_stl_occmesh_iterator occ_itmesh(stlMesh);
+    const gmio_stl_mesh occmesh = gmio_stl_occmesh(occ_itmesh);
+    const int error = gmio_stl_write_file(format, filepath, &occmesh, &options);
     if (error != GMIO_ERROR_OK)
         printf("gmio error: 0x%X\n", error);
 }
diff --git a/src/gmio_stl/internal/stla_infos_get.c b/src/gmio_stl/internal/stla_infos_get.c
index bfc7114..ed223a0 100644
--- a/src/gmio_stl/internal/stla_infos_get.c
+++ b/src/gmio_stl/internal/stla_infos_get.c
@@ -62,7 +62,7 @@ static size_t gmio_stringstream_read(
 
 int gmio_stla_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags,
         const struct gmio_stl_infos_get_options* opts)
 {
@@ -85,7 +85,7 @@ int gmio_stla_infos_get(
         return err;
 
     /* Initialize string stream */
-    sstream.stream = stream;
+    sstream.stream = *stream;
     sstream.strbuff = gmio_string(mblock_ptr, 0, mblock_size);
     if (flag_size) {
         infos->size = 0;
diff --git a/src/gmio_stl/internal/stla_infos_get.h b/src/gmio_stl/internal/stla_infos_get.h
index 74a0991..9e5dcc0 100644
--- a/src/gmio_stl/internal/stla_infos_get.h
+++ b/src/gmio_stl/internal/stla_infos_get.h
@@ -21,7 +21,7 @@
 /*! Find infos from a STL ASCII stream */
 int gmio_stla_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags,
         const struct gmio_stl_infos_get_options* opts);
 
diff --git a/src/gmio_stl/internal/stla_write.c b/src/gmio_stl/internal/stla_write.c
index 3903c98..868fec4 100644
--- a/src/gmio_stl/internal/stla_write.c
+++ b/src/gmio_stl/internal/stla_write.c
@@ -134,8 +134,8 @@ GMIO_INLINE bool gmio_stream_flush_buffer(
 }
 
 int gmio_stla_write(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* opts)
 {
     /* Constants */
@@ -143,7 +143,7 @@ int gmio_stla_write(
     struct gmio_memblock_helper mblock_helper =
             gmio_memblock_helper(opts != NULL ? &opts->stream_memblock : NULL);
     const size_t mblock_size = mblock_helper.memblock.size;
-    const uint32_t total_facet_count = mesh.triangle_count;
+    const uint32_t total_facet_count = mesh != NULL ? mesh->triangle_count : 0;
     const uint32_t buffer_facet_count =
             gmio_size_to_uint32(mblock_size / GMIO_STLA_FACET_SIZE_P2);
     const char* opt_solid_name = opts != NULL ? opts->stla_solid_name : NULL;
@@ -167,7 +167,7 @@ int gmio_stla_write(
     /* Check validity of input parameters */
     if (!gmio_check_memblock_size(&error, mblock, GMIO_STLA_FACET_SIZE_P2))
         goto label_end;
-    if (!gmio_stl_check_mesh(&error, &mesh))
+    if (!gmio_stl_check_mesh(&error, mesh))
         goto label_end;
     if (!gmio_stla_check_float32_precision(&error, f32_prec))
         goto label_end;
@@ -189,7 +189,7 @@ int gmio_stla_write(
         char* buffpos = mblock_ptr;
         buffpos = gmio_write_rawstr(buffpos, "solid ");
         buffpos = gmio_write_rawstr_eol(buffpos, solid_name);
-        if (!gmio_stream_flush_buffer(&stream, mblock_ptr, buffpos)) {
+        if (!gmio_stream_flush_buffer(stream, mblock_ptr, buffpos)) {
             error = GMIO_ERROR_STREAM;
             goto label_end;
         }
@@ -213,7 +213,7 @@ int gmio_stla_write(
              ibuffer_facet < clamped_facet_count;
              ++ibuffer_facet)
         {
-            mesh.func_get_triangle(mesh.cookie, ibuffer_facet, &tri);
+            mesh->func_get_triangle(mesh->cookie, ibuffer_facet, &tri);
 
             buffpos = gmio_write_rawstr(buffpos, "facet normal ");
             buffpos = gmio_write_coords(buffpos, coords_format_str, &tri.n);
@@ -230,7 +230,7 @@ int gmio_stla_write(
             buffpos = gmio_write_rawstr(buffpos, "\nendfacet\n");
         } /* end for (ibuffer_facet) */
 
-        if (!gmio_stream_flush_buffer(&stream, mblock_ptr, buffpos))
+        if (!gmio_stream_flush_buffer(stream, mblock_ptr, buffpos))
             error = GMIO_ERROR_STREAM;
 
         /* Task control */
@@ -243,7 +243,7 @@ int gmio_stla_write(
         char* buffpos = mblock_ptr;
         buffpos = gmio_write_rawstr(buffpos, "endsolid ");
         buffpos = gmio_write_rawstr_eol(buffpos, solid_name);
-        if (!gmio_stream_flush_buffer(&stream, mblock_ptr, buffpos))
+        if (!gmio_stream_flush_buffer(stream, mblock_ptr, buffpos))
             error = GMIO_ERROR_STREAM;
     }
 
diff --git a/src/gmio_stl/internal/stla_write.h b/src/gmio_stl/internal/stla_write.h
index 52f438d..d9e8b14 100644
--- a/src/gmio_stl/internal/stla_write.h
+++ b/src/gmio_stl/internal/stla_write.h
@@ -27,8 +27,8 @@
  *          if <tt>options->stream_memblock.size < 512</tt>
  */
 int gmio_stla_write(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* options);
 
 #endif /* GMIO_INTERNAL_STLA_WRITE_H */
diff --git a/src/gmio_stl/internal/stlb_infos_get.c b/src/gmio_stl/internal/stlb_infos_get.c
index f96495f..0a54bce 100644
--- a/src/gmio_stl/internal/stlb_infos_get.c
+++ b/src/gmio_stl/internal/stlb_infos_get.c
@@ -32,7 +32,7 @@ static enum gmio_endianness gmio_stl_format_to_endianness(
 
 int gmio_stlb_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags,
         const struct gmio_stl_infos_get_options* opts)
 {
@@ -44,7 +44,7 @@ int gmio_stlb_infos_get(
 
         { /* Read header and facet count into buff */
             const size_t read_size =
-                    gmio_stream_read(&stream, buff, 1, sizeof(buff));
+                    gmio_stream_read_bytes(stream, buff, sizeof(buff));
             if (read_size != sizeof(buff))
                 return GMIO_ERROR_STREAM;
         }
diff --git a/src/gmio_stl/internal/stlb_infos_get.h b/src/gmio_stl/internal/stlb_infos_get.h
index cbf7af1..e48d4a2 100644
--- a/src/gmio_stl/internal/stlb_infos_get.h
+++ b/src/gmio_stl/internal/stlb_infos_get.h
@@ -22,7 +22,7 @@
 /*! Finds infos from a STL binary stream */
 int gmio_stlb_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags,
         const struct gmio_stl_infos_get_options* opts);
 
diff --git a/src/gmio_stl/internal/stlb_write.c b/src/gmio_stl/internal/stlb_write.c
index 224965c..f31b4be 100644
--- a/src/gmio_stl/internal/stlb_write.c
+++ b/src/gmio_stl/internal/stlb_write.c
@@ -87,8 +87,8 @@ static void gmio_stlb_encode_facets_byteswap(
 
 int gmio_stlb_write(
         enum gmio_endianness byte_order,
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* opts)
 {
     /* Constants */
@@ -96,7 +96,7 @@ int gmio_stlb_write(
     struct gmio_memblock_helper mblock_helper =
             gmio_memblock_helper(opts != NULL ? &opts->stream_memblock : NULL);
     const size_t mblock_size = mblock_helper.memblock.size;
-    const uint32_t facet_count = mesh.triangle_count;
+    const uint32_t facet_count = mesh != NULL ? mesh->triangle_count : 0;
     const func_gmio_stlb_encode_facets_t func_encode_facets =
             byte_order != GMIO_ENDIANNESS_HOST ?
                 gmio_stlb_encode_facets_byteswap :
@@ -116,13 +116,13 @@ int gmio_stlb_write(
     /* Check validity of input parameters */
     if (!gmio_check_memblock(&error, &mblock_helper.memblock))
         goto label_end;
-    if (!gmio_stl_check_mesh(&error, &mesh))
+    if (!gmio_stl_check_mesh(&error, mesh))
         goto label_end;
     if (!gmio_stlb_check_byteorder(&error, byte_order))
         goto label_end;
 
     if (!write_triangles_only) {
-        error = gmio_stlb_write_header(&stream, byte_order, header, facet_count);
+        error = gmio_stlb_write_header(stream, byte_order, header, facet_count);
         if (gmio_error(error))
             goto label_end;
     }
@@ -136,11 +136,11 @@ int gmio_stlb_write(
 
         /* Write to memory block */
         write_facet_count = GMIO_MIN(write_facet_count, facet_count - i_facet);
-        func_encode_facets(&mesh, mblock_ptr, write_facet_count, i_facet);
+        func_encode_facets(mesh, mblock_ptr, write_facet_count, i_facet);
 
         /* Write memory block to stream */
         if (gmio_stream_write(
-                    &stream,
+                    stream,
                     mblock_ptr,
                     GMIO_STLB_TRIANGLE_RAWSIZE,
                     write_facet_count)
diff --git a/src/gmio_stl/internal/stlb_write.h b/src/gmio_stl/internal/stlb_write.h
index 52cd1ce..abce2fd 100644
--- a/src/gmio_stl/internal/stlb_write.h
+++ b/src/gmio_stl/internal/stlb_write.h
@@ -29,8 +29,8 @@
  */
 int gmio_stlb_write(
         enum gmio_endianness byte_order,
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* opts);
 
 #endif /* GMIO_INTERNAL_STLB_WRITE_H */
diff --git a/src/gmio_stl/stl_infos.c b/src/gmio_stl/stl_infos.c
index 651114f..f82b485 100644
--- a/src/gmio_stl/stl_infos.c
+++ b/src/gmio_stl/stl_infos.c
@@ -25,12 +25,12 @@
 
 int gmio_stl_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags,
         const struct gmio_stl_infos_get_options* opts)
 {
     int error = GMIO_ERROR_OK;
-    const struct gmio_streampos begin_streampos = gmio_streampos(&stream, NULL);
+    const struct gmio_streampos begin_streampos = gmio_streampos(stream, NULL);
     struct gmio_memblock_helper mblock_helper =
             gmio_memblock_helper(opts != NULL ? &opts->stream_memblock : NULL);
     enum gmio_stl_format format =
@@ -43,7 +43,7 @@ int gmio_stl_infos_get(
 
     /* Guess format when left unspecified */
     if (format == GMIO_STL_FORMAT_UNKNOWN) {
-        format = gmio_stl_get_format(&stream);
+        format = gmio_stl_get_format(stream);
         if (format == GMIO_STL_FORMAT_UNKNOWN) {
             error = GMIO_STL_ERROR_UNKNOWN_FORMAT;
             goto label_end;
@@ -69,7 +69,7 @@ int gmio_stl_infos_get(
     }
 
 label_end:
-    gmio_stream_set_pos(&stream, &begin_streampos);
+    gmio_stream_set_pos(stream, &begin_streampos);
     gmio_memblock_helper_release(&mblock_helper);
     return error;
 }
@@ -81,6 +81,6 @@ gmio_streamsize_t gmio_stla_infos_get_streamsize(
     struct gmio_stl_infos_get_options options = {0};
     options.stream_memblock = *stream_memblock;
     options.format_hint = GMIO_STL_FORMAT_ASCII;
-    gmio_stl_infos_get(&infos, *stream, GMIO_STL_INFO_FLAG_SIZE, &options);
+    gmio_stl_infos_get(&infos, stream, GMIO_STL_INFO_FLAG_SIZE, &options);
     return infos.size;
 }
diff --git a/src/gmio_stl/stl_infos.h b/src/gmio_stl/stl_infos.h
index a00c92f..4e4d7ef 100644
--- a/src/gmio_stl/stl_infos.h
+++ b/src/gmio_stl/stl_infos.h
@@ -113,7 +113,7 @@ GMIO_C_LINKAGE_BEGIN
 GMIO_LIBSTL_EXPORT
 int gmio_stl_infos_get(
         struct gmio_stl_infos* infos,
-        struct gmio_stream stream,
+        struct gmio_stream* stream,
         unsigned flags, /*!< Bitor combination of gmio_stl_info_flag values */
         const struct gmio_stl_infos_get_options* options);
 
diff --git a/src/gmio_stl/stl_io.c b/src/gmio_stl/stl_io.c
index 25da1af..72871de 100644
--- a/src/gmio_stl/stl_io.c
+++ b/src/gmio_stl/stl_io.c
@@ -24,11 +24,11 @@
 #include "../gmio_core/internal/helper_stream.h"
 
 int gmio_stl_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* options)
 {
-    const enum gmio_stl_format format = gmio_stl_get_format(&stream);
+    const enum gmio_stl_format format = gmio_stl_get_format(stream);
     switch (format) {
     case GMIO_STL_FORMAT_ASCII:
         return gmio_stla_read(stream, mesh_creator, options);
@@ -46,13 +46,13 @@ int gmio_stl_read(
 
 int gmio_stl_read_file(
         const char* filepath,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* options)
 {
     FILE* file = fopen(filepath, "rb");
     if (file != NULL) {
-        const int error =
-                gmio_stl_read(gmio_stream_stdio(file), mesh_creator, options);
+        struct gmio_stream stream = gmio_stream_stdio(file);
+        const int error = gmio_stl_read(&stream, mesh_creator, options);
         fclose(file);
         return error;
     }
@@ -61,8 +61,8 @@ int gmio_stl_read_file(
 
 int gmio_stl_write(
         enum gmio_stl_format format,
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* options)
 {
     switch (format) {
@@ -81,13 +81,13 @@ int gmio_stl_write(
 int gmio_stl_write_file(
         enum gmio_stl_format format,
         const char* filepath,
-        struct gmio_stl_mesh mesh,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* options)
 {
     FILE* file = fopen(filepath, "wb");
     if (file != NULL) {
-        const int error =
-                gmio_stl_write(format, gmio_stream_stdio(file), mesh, options);
+        struct gmio_stream stream = gmio_stream_stdio(file);
+        const int error = gmio_stl_write(format, &stream, mesh, options);
         fclose(file);
         return error;
     }
diff --git a/src/gmio_stl/stl_io.h b/src/gmio_stl/stl_io.h
index ab9fead..728629d 100644
--- a/src/gmio_stl/stl_io.h
+++ b/src/gmio_stl/stl_io.h
@@ -39,8 +39,8 @@ GMIO_C_LINKAGE_BEGIN
  *  \return Error code (see gmio_core/error.h and stl_error.h)
  */
 GMIO_LIBSTL_EXPORT int gmio_stl_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* options);
 
 /*! Reads STL mesh from a file, format is automatically guessed
@@ -53,7 +53,7 @@ GMIO_LIBSTL_EXPORT int gmio_stl_read(
  */
 GMIO_LIBSTL_EXPORT int gmio_stl_read_file(
         const char* filepath,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* options);
 
 /*! Reads geometry from STL ascii stream
@@ -62,8 +62,8 @@ GMIO_LIBSTL_EXPORT int gmio_stl_read_file(
  */
 GMIO_LIBSTL_EXPORT
 int gmio_stla_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* options);
 
 /*! Reads geometry from STL binary stream
@@ -74,8 +74,8 @@ int gmio_stla_read(
  */
 GMIO_LIBSTL_EXPORT
 int gmio_stlb_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         enum gmio_endianness byte_order,
         const struct gmio_stl_read_options* options);
 
@@ -86,8 +86,8 @@ int gmio_stlb_read(
 GMIO_LIBSTL_EXPORT
 int gmio_stl_write(
         enum gmio_stl_format format,
-        struct gmio_stream stream,
-        struct gmio_stl_mesh mesh,
+        struct gmio_stream* stream,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* options);
 
 /*! Writes STL mesh to stream
@@ -104,7 +104,7 @@ GMIO_LIBSTL_EXPORT
 int gmio_stl_write_file(
         enum gmio_stl_format format,
         const char* filepath,
-        struct gmio_stl_mesh mesh,
+        const struct gmio_stl_mesh* mesh,
         const struct gmio_stl_write_options* options);
 
 /*! Writes STL binary header data to stream
diff --git a/src/gmio_stl/stla_read.c b/src/gmio_stl/stla_read.c
index b23b2c9..15393fc 100644
--- a/src/gmio_stl/stla_read.c
+++ b/src/gmio_stl/stla_read.c
@@ -106,8 +106,8 @@ static size_t gmio_stringstream_stla_read(
 static void parse_solid(struct gmio_stla_parse_data* data);
 
 int gmio_stla_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         const struct gmio_stl_read_options* opts)
 {
     struct gmio_memblock_helper mblock_helper =
@@ -124,11 +124,11 @@ int gmio_stla_read(
 
     parse_data.strstream_cookie.stream_size =
             opts != NULL && opts->func_stla_get_streamsize != NULL ?
-                opts->func_stla_get_streamsize(&stream, mblock) :
-                gmio_stream_size(&stream);
+                opts->func_stla_get_streamsize(stream, mblock) :
+                gmio_stream_size(stream);
     parse_data.strstream_cookie.is_stop_requested = false;
 
-    parse_data.strstream.stream = stream;
+    parse_data.strstream.stream = *stream;
     parse_data.strstream.strbuff.ptr = mblock->ptr;
     parse_data.strstream.strbuff.max_len = mblock->size;
     parse_data.strstream.cookie = &parse_data.strstream_cookie;
@@ -137,7 +137,7 @@ int gmio_stla_read(
 
     parse_data.token_str = gmio_string(fixed_buffer, 0, sizeof(fixed_buffer));
 
-    parse_data.creator = &mesh_creator;
+    parse_data.creator = mesh_creator;
 
     parse_solid(&parse_data);
 
diff --git a/src/gmio_stl/stlb_read.c b/src/gmio_stl/stlb_read.c
index 1f3725f..773da18 100644
--- a/src/gmio_stl/stlb_read.c
+++ b/src/gmio_stl/stlb_read.c
@@ -90,8 +90,8 @@ static void gmio_stlb_decode_facets_byteswap(
 }
 
 int gmio_stlb_read(
-        struct gmio_stream stream,
-        struct gmio_stl_mesh_creator mesh_creator,
+        struct gmio_stream* stream,
+        struct gmio_stl_mesh_creator* mesh_creator,
         enum gmio_endianness byte_order,
         const struct gmio_stl_read_options* opts)
 {
@@ -119,13 +119,13 @@ int gmio_stlb_read(
         goto label_end;
 
     /* Read header */
-    if (gmio_stream_read(&stream, &header, GMIO_STLB_HEADER_SIZE, 1) != 1) {
+    if (gmio_stream_read(stream, &header, GMIO_STLB_HEADER_SIZE, 1) != 1) {
         error = GMIO_STL_ERROR_HEADER_WRONG_SIZE;
         goto label_end;
     }
 
     /* Read facet count */
-    if (gmio_stream_read(&stream, mblock->ptr, sizeof(uint32_t), 1) != 1) {
+    if (gmio_stream_read(stream, mblock->ptr, sizeof(uint32_t), 1) != 1) {
         error = GMIO_STL_ERROR_FACET_COUNT;
         goto label_end;
     }
@@ -142,7 +142,7 @@ int gmio_stlb_read(
                     GMIO_STL_FORMAT_BINARY_BE;
         infos.stlb_header = &header;
         infos.stlb_triangle_count = total_facet_count;
-        gmio_stl_mesh_creator_begin_solid(&mesh_creator, &infos);
+        gmio_stl_mesh_creator_begin_solid(mesh_creator, &infos);
     }
 
     /* Read triangles */
@@ -154,12 +154,12 @@ int gmio_stlb_read(
         const uint32_t read_facet_count =
                 gmio_size_to_uint32(
                     gmio_stream_read(
-                        &stream,
+                        stream,
                         mblock->ptr,
                         GMIO_STLB_TRIANGLE_RAWSIZE,
                         facet_count_to_read));
 
-        if (gmio_stream_error(&stream) != 0)
+        if (gmio_stream_error(stream) != 0)
             error = GMIO_ERROR_STREAM;
         else if (read_facet_count > 0)
             error = GMIO_ERROR_OK;
@@ -168,7 +168,7 @@ int gmio_stlb_read(
 
         if (gmio_no_error(error)) {
             func_decode_facets(
-                        &mesh_creator, mblock->ptr, read_facet_count, i_facet);
+                        mesh_creator, mblock->ptr, read_facet_count, i_facet);
             i_facet += read_facet_count;
             if (gmio_task_iface_is_stop_requested(task))
                 error = GMIO_ERROR_TRANSFER_STOPPED;
@@ -177,7 +177,7 @@ int gmio_stlb_read(
     } /* end while */
 
     if (gmio_no_error(error))
-        gmio_stl_mesh_creator_end_solid(&mesh_creator);
+        gmio_stl_mesh_creator_end_solid(mesh_creator);
 
     if (gmio_no_error(error) && i_facet != total_facet_count)
         error = GMIO_STL_ERROR_FACET_COUNT;
diff --git a/src/gmio_support/stl_occ.h b/src/gmio_support/stl_occ.h
index 1666d1c..d3a93ac 100644
--- a/src/gmio_support/stl_occ.h
+++ b/src/gmio_support/stl_occ.h
@@ -48,8 +48,8 @@ class TColgp_SequenceOfXYZ;
 struct GMIO_LIBSUPPORT_EXPORT gmio_stl_occmesh_iterator
 {
     gmio_stl_occmesh_iterator();
-    gmio_stl_occmesh_iterator(const StlMesh_Mesh* mesh);
-    gmio_stl_occmesh_iterator(const Handle_StlMesh_Mesh& hnd);
+    explicit gmio_stl_occmesh_iterator(const StlMesh_Mesh* mesh);
+    explicit gmio_stl_occmesh_iterator(const Handle_StlMesh_Mesh& hnd);
 
     bool move_to_next_tri(uint32_t tri_id);
     inline const Handle_StlMesh_MeshTriangle& domain_tri(uint32_t tri_id) const;
@@ -76,21 +76,9 @@ private:
  *  Example of use:
  *  \code
  *      Handle_StlMesh_Mesh occmesh = ...;
- *      gmio_stl_write_file(
- *              stl_format,
- *              filepath,
- *              gmio_stl_occmesh(occmesh), // Implicit temporary iterator
- *              &options);
- *  \endcode
- *
- *  Dangerous use:
- *  \code
- *      Handle_StlMesh_Mesh occmesh = ...;
- *      const gmio_stl_mesh mesh =
- *              gmio_stl_occmesh(gmio_stl_occmesh_iterator(occmesh));
- *      // At this point the iterator object is destroyed, mesh.cookie points to
- *      // some garbage. The following line may cause a crash.
- *      gmio_stl_write_file(stl_format, filepath, mesh, &options);
+ *      const gmio_stl_occmesh_iterator it(occmesh);
+ *      const gmio_stl_mesh mesh = gmio_stl_occmesh(it);
+ *      gmio_stl_write_file(stl_format, filepath, &mesh, &options);
  *  \endcode
  */
 GMIO_LIBSUPPORT_EXPORT
diff --git a/tests/test_stl_infos.c b/tests/test_stl_infos.c
index 97c818f..a3ce992 100644
--- a/tests/test_stl_infos.c
+++ b/tests/test_stl_infos.c
@@ -58,7 +58,7 @@ const char* generic_test_stl_infos(const struct gmio_test_stl_infos* test)
 
     infos.stla_solidname = stla_solid_name;
     infos.stla_solidname_maxlen = sizeof(stla_solid_name) - 1;
-    error = gmio_stl_infos_get(&infos, stream, GMIO_STL_INFO_FLAG_ALL, NULL);
+    error = gmio_stl_infos_get(&infos, &stream, GMIO_STL_INFO_FLAG_ALL, NULL);
     if (test->format != GMIO_STL_FORMAT_UNKNOWN) {
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
     }
diff --git a/tests/test_stl_io.c b/tests/test_stl_io.c
index 5803b2d..ed77d51 100644
--- a/tests/test_stl_io.c
+++ b/tests/test_stl_io.c
@@ -145,7 +145,7 @@ const char* test_stl_read()
         const enum gmio_stl_format format =
                 gmio_stl_get_format_file(expected[i].filepath);
         const int err =
-                gmio_stl_read_file(expected[i].filepath, mesh_creator, NULL);
+                gmio_stl_read_file(expected[i].filepath, &mesh_creator, NULL);
 
         /* Check format */
         if (format != expected[i].format) {
@@ -209,8 +209,8 @@ const char* test_stlb_write_header()
 
     {
         struct gmio_stl_data data = {0};
-        error = gmio_stl_read_file(
-                    filepath, gmio_stl_data_mesh_creator(&data), NULL);
+        struct gmio_stl_mesh_creator creator = gmio_stl_data_mesh_creator(&data);
+        error = gmio_stl_read_file(filepath, &creator, NULL);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
         UTEST_ASSERT(gmio_stlb_header_equal(&header, &data.header));
         UTEST_COMPARE_UINT(0, data.tri_array.count);
@@ -230,16 +230,16 @@ static void fclose_2(FILE* f1, FILE* f2)
 
 const char* test_stlb_write()
 {
-    const char* model_filepath = stl_grabcad_arm11_filepath;
-    const char* model_filepath_out = "temp/solid.le_stlb";
-    const char* model_filepath_out_be = "temp/solid.be_stlb";
+    const char* model_fpath = stl_grabcad_arm11_filepath;
+    const char* model_fpath_out = "temp/solid.le_stlb";
+    const char* model_fpath_out_be = "temp/solid.be_stlb";
     struct gmio_stl_data data = {0};
     int error = GMIO_ERROR_OK;
 
     /* Read input model file */
     {
-        error = gmio_stl_read_file(
-                    model_filepath, gmio_stl_data_mesh_creator(&data), NULL);
+        struct gmio_stl_mesh_creator creator = gmio_stl_data_mesh_creator(&data);
+        error = gmio_stl_read_file(model_fpath, &creator, NULL);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
     }
 
@@ -247,21 +247,16 @@ const char* test_stlb_write()
      * Write also the model file in big-endian STL format
      */
     {
+        const struct gmio_stl_mesh mesh = gmio_stl_data_mesh(&data);
         struct gmio_stl_write_options opts = {0};
         opts.stlb_header = data.header;
         error = gmio_stl_write_file(
-                    GMIO_STL_FORMAT_BINARY_LE,
-                    model_filepath_out,
-                    gmio_stl_data_mesh(&data),
-                    &opts);
+                    GMIO_STL_FORMAT_BINARY_LE, model_fpath_out, &mesh, &opts);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
 
         /* Big-endian version */
         error = gmio_stl_write_file(
-                    GMIO_STL_FORMAT_BINARY_BE,
-                    model_filepath_out_be,
-                    gmio_stl_data_mesh(&data),
-                    &opts);
+                    GMIO_STL_FORMAT_BINARY_BE, model_fpath_out_be, &mesh, &opts);
     }
 
     /* Check input and output models are equal */
@@ -271,8 +266,8 @@ const char* test_stlb_write()
         const size_t buff_size = 2048;
         size_t bytes_read_in = 0;
         size_t bytes_read_out = 0;
-        FILE* in = fopen(model_filepath, "rb");
-        FILE* out = fopen(model_filepath_out, "rb");
+        FILE* in = fopen(model_fpath, "rb");
+        FILE* out = fopen(model_fpath_out, "rb");
         if (in == NULL || out == NULL) {
             fclose_2(in, out);
             perror("test_stlb_write()");
@@ -297,10 +292,8 @@ const char* test_stlb_write()
     /* Check output LE/BE models are equal */
     {
         struct gmio_stl_data data_be = {0};
-        error = gmio_stl_read_file(
-                    model_filepath_out_be,
-                    gmio_stl_data_mesh_creator(&data_be),
-                    NULL);
+        struct gmio_stl_mesh_creator creator = gmio_stl_data_mesh_creator(&data_be);
+        error = gmio_stl_read_file(model_fpath_out_be, &creator, NULL);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
         UTEST_ASSERT(gmio_stlb_header_equal(&data.header, &data_be.header));
         UTEST_COMPARE_UINT(data.tri_array.count, data_be.tri_array.count);
@@ -326,23 +319,21 @@ const char* test_stla_write()
 
     /* Read input model file */
     {
-        error = gmio_stl_read_file(
-                    model_filepath, gmio_stl_data_mesh_creator(&data), NULL);
+        struct gmio_stl_mesh_creator creator = gmio_stl_data_mesh_creator(&data);
+        error = gmio_stl_read_file(model_filepath, &creator, NULL);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
     }
 
     /* Write the model to STL ascii format */
     {
         struct gmio_stl_write_options opts = {0};
+        const struct gmio_stl_mesh mesh = gmio_stl_data_mesh(&data);
         gmio_stlb_header_to_printable_str(&data.header, header_str, '_');
         opts.stla_solid_name = header_str;
         opts.stla_float32_prec = 7;
         opts.stla_float32_format = GMIO_FLOAT_TEXT_FORMAT_SHORTEST_LOWERCASE;
         error = gmio_stl_write_file(
-                    GMIO_STL_FORMAT_ASCII,
-                    model_filepath_out,
-                    gmio_stl_data_mesh(&data),
-                    &opts);
+                    GMIO_STL_FORMAT_ASCII, model_filepath_out, &mesh, &opts);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
     }
 
@@ -350,13 +341,12 @@ const char* test_stla_write()
     {
         char trim_header_str[sizeof(header_str)] = {0};
         struct gmio_stl_data data_stla = {0};
+        struct gmio_stl_mesh_creator creator =
+                gmio_stl_data_mesh_creator(&data_stla);
         size_t i = 0;
         strncpy(trim_header_str, header_str, sizeof(header_str));
         gmio_string_trim_from_end(trim_header_str, sizeof(header_str));
-        error = gmio_stl_read_file(
-                    model_filepath_out,
-                    gmio_stl_data_mesh_creator(&data_stla),
-                    NULL);
+        error = gmio_stl_read_file(model_filepath_out, &creator, NULL);
         UTEST_COMPARE_INT(GMIO_ERROR_OK, error);
         UTEST_COMPARE_UINT(data.tri_array.count, data_stla.tri_array.count);
         UTEST_COMPARE_CSTR(trim_header_str, data_stla.solid_name);
@@ -378,12 +368,12 @@ const char* generic_test_stl_read_multi_solid(
     if (infile != NULL) {
         unsigned solid_count = 0;
         int error = GMIO_ERROR_OK;
+        struct gmio_stream stream = gmio_stream_stdio(infile);
         struct gmio_stl_read_options roptions = {0};
+        struct gmio_stl_mesh_creator null_creator = {0};
         roptions.func_stla_get_streamsize = gmio_stla_infos_get_streamsize;
         while (gmio_no_error(error)) {
-            const struct gmio_stl_mesh_creator null_creator = {0};
-            error = gmio_stl_read(
-                        gmio_stream_stdio(infile), null_creator, &roptions);
+            error = gmio_stl_read(&stream, &null_creator, &roptions);
             if (gmio_no_error(error))
                 ++solid_count;
         }
@@ -417,6 +407,8 @@ void generate_stlb_tests_models()
     }
 
     {
+        const char model_fpath_le[] = "models/solid_one_facet.le_stlb";
+        const char model_fpath_be[] = "models/solid_one_facet.be_stlb";
         struct gmio_stl_triangle tri = {
             { 0.f, 0.f, 1.f },  /* normal */
             { 0.f, 0.f, 0.f },  /* v1 */
@@ -425,41 +417,35 @@ void generate_stlb_tests_models()
             0                   /* attr */
         };
         struct gmio_stl_data data = {0};
+        struct gmio_stl_mesh mesh = {0};
 
         data.tri_array.ptr = &tri;
         data.tri_array.count = 1;
+        mesh = gmio_stl_data_mesh(&data);
 
         gmio_stl_write_file(
-                    GMIO_STL_FORMAT_BINARY_LE,
-                    "models/solid_one_facet.le_stlb",
-                    gmio_stl_data_mesh(&data),
-                    NULL);
+                    GMIO_STL_FORMAT_BINARY_LE, model_fpath_le, &mesh, NULL);
         gmio_stl_write_file(
-                    GMIO_STL_FORMAT_BINARY_BE,
-                    "models/solid_one_facet.be_stlb",
-                    gmio_stl_data_mesh(&data),
-                    NULL);
+                    GMIO_STL_FORMAT_BINARY_BE, model_fpath_be, &mesh, NULL);
     }
 
     {
         FILE* infile = fopen("models/solid_4meshs.stla", "rb");
         FILE* outfile = fopen("models/solid_4meshs.le_stlb", "wb");
         int read_error = GMIO_ERROR_OK;
-        struct gmio_stl_read_options roptions = {0};
-        roptions.func_stla_get_streamsize = gmio_stla_infos_get_streamsize;
+        struct gmio_stream istream = gmio_stream_stdio(infile);
+        struct gmio_stream ostream = gmio_stream_stdio(outfile);
+        struct gmio_stl_read_options ropts = {0};
+        ropts.func_stla_get_streamsize = gmio_stla_infos_get_streamsize;
         while (gmio_no_error(read_error)) {
             struct gmio_stl_data data = {0};
-            struct gmio_stl_write_options woptions = {0};
-            read_error = gmio_stla_read(
-                        gmio_stream_stdio(infile),
-                        gmio_stl_data_mesh_creator(&data),
-                        &roptions);
-            woptions.stlb_header = gmio_stlb_header_str(data.solid_name);
-            gmio_stl_write(
-                        GMIO_STL_FORMAT_BINARY_LE,
-                        gmio_stream_stdio(outfile),
-                        gmio_stl_data_mesh(&data),
-                        &woptions);
+            struct gmio_stl_mesh_creator creator = gmio_stl_data_mesh_creator(&data);
+            struct gmio_stl_mesh mesh = {0};
+            struct gmio_stl_write_options wopts = {0};
+            read_error = gmio_stla_read(&istream, &creator, &ropts);
+            mesh = gmio_stl_data_mesh(&data);
+            wopts.stlb_header = gmio_stlb_header_str(data.solid_name);
+            gmio_stl_write(GMIO_STL_FORMAT_BINARY_LE, &ostream, &mesh, &wopts);
             gmio_stl_triangle_array_free(&data.tri_array);
         }
         fclose(infile);