move some functions from loadsave.c to loadsavefuncs.c

src/loadsavefuncs.h

@@ -0,0 +1,50 @@
+/* vim:expandtab:ts=2 sw=2:
+*/
+/*  Grafx2 - The Ultimate 256-color bitmap paint program
+
+    Copyright 2019 Thomas Bernard
+    Copyright 2007 Adrien Destugues
+    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)
+
+    Grafx2 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; version 2
+    of the License.
+
+    Grafx2 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 Grafx2; if not, see <http://www.gnu.org/licenses/>
+*/
+//////////////////////////////////////////////////////////////////////////////
+///@file loadsavefuncs.h
+/// helper functions for load/save
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef LOADSAVEFUNCS_H_INCLUDED
+#define LOADSAVEFUNCS_H_INCLUDED
+
+/// For use by Save_XXX() functions
+FILE * Open_file_write(T_IO_Context *context);
+
+/// For use by Load_XXX() and Test_XXX() functions
+FILE * Open_file_read(T_IO_Context *context);
+
+/// For use by Load_XXX() and Test_XXX() functions
+FILE * Open_file_read_with_alternate_ext(T_IO_Context *context, const char * ext);
+
+/// For use by Save_XXX() functions
+void Remove_file(T_IO_Context *context);
+
+/// For use by Save_XXX() functions
+FILE * Open_file_write_with_alternate_ext(T_IO_Context *context, const char * ext);
+
+#define Write_one_byte(file, b) do { if (!Write_byte(file,(b))) File_error=1; } while (0)
+
+void Palette_256_to_64(T_Palette palette);
+void Palette_64_to_256(T_Palette palette);
+
+#endif