From a231d650f2f43f683452583b6c5e194ef8edda73 Mon Sep 17 00:00:00 2001
From: veclavtalica <veclavtalica@tutamail.com>
Date: Thu, 20 Feb 2025 19:51:52 +0300
Subject: [PATCH] twn_util.c: add file_read()

---
 include/twn_util.h              |  3 ++
 share/twn_api.json              | 10 ++++++
 src/twn_loop.c                  |  6 ++++
 src/twn_util.c                  | 18 ++++++++++
 src/twn_util_c.h                |  2 ++
 third-party/fast_obj/fast_obj.h | 64 ---------------------------------
 6 files changed, 39 insertions(+), 64 deletions(-)

diff --git a/include/twn_util.h b/include/twn_util.h
index f21494f..3a3c334 100644
--- a/include/twn_util.h
+++ b/include/twn_util.h
@@ -42,6 +42,9 @@
 
 #endif /* TWN_NOT_C */
 
+/* read file to null terminated string, it is freed when the frame ends */
+TWN_API char const *file_read(char const *file);
+
 /* calculates the overlap of two rectangles */
 TWN_API Rect rect_overlap(Rect a, Rect b);
 /* returns true if two rectangles are intersecting */
diff --git a/share/twn_api.json b/share/twn_api.json
index 5811e2e..98dad5e 100644
--- a/share/twn_api.json
+++ b/share/twn_api.json
@@ -264,6 +264,16 @@
             ]
         },
 
+        "file_read": {
+            "module": "util",
+            "symbol": "read",
+            "header": "twn_util.h",
+            "params": [
+                { "name": "file", "type": "char *" }
+            ],
+            "return": "char *"
+        },
+
         "timer_tick_seconds": {
             "module": "util",
             "symbol": "tick_seconds",
diff --git a/src/twn_loop.c b/src/twn_loop.c
index 7c182a8..d6a58f3 100644
--- a/src/twn_loop.c
+++ b/src/twn_loop.c
@@ -754,6 +754,11 @@ static bool try_mounting_root_pack(char *path) {
 }
 
 
+static void garbage_collect(void) {
+    file_read_garbage_collect();
+}
+
+
 int enter_loop(int argc, char **argv) {
     profile_start("startup");
 
@@ -866,6 +871,7 @@ int enter_loop(int argc, char **argv) {
         /* dispatch all filewatch driven events, such as game object and asset pack reload */
         filewatch_poll();
         main_loop();
+        garbage_collect();
     }
 
     if (ctx.game.debug)
diff --git a/src/twn_util.c b/src/twn_util.c
index fe624bf..40d88c2 100644
--- a/src/twn_util.c
+++ b/src/twn_util.c
@@ -154,6 +154,24 @@ char *file_to_str(const char *path) {
     return str_out;
 }
 
+static char **read_files;
+
+char const *file_read(char const *file) {
+    char *s = file_to_str(file);
+
+    if (s) arrpush(read_files, s);
+
+    return s;
+}
+
+
+void file_read_garbage_collect(void) {
+    for (size_t i = 0; i < arrlenu(read_files); ++i)
+        SDL_free(read_files[i]);
+    arrfree(read_files);
+    read_files = NULL;
+}
+
 
 bool file_exists(const char *path) {
     return PHYSFS_exists(path);
diff --git a/src/twn_util_c.h b/src/twn_util_c.h
index 15ce61f..f2d6f8f 100644
--- a/src/twn_util_c.h
+++ b/src/twn_util_c.h
@@ -29,6 +29,8 @@ char *expand_asterisk(const char *mask, const char *to);
 
 void profile_list_stats(void);
 
+void file_read_garbage_collect(void);
+
 /* http://www.azillionmonkeys.com/qed/sqroot.html */
 static inline float fast_sqrt(float x)
 {
diff --git a/third-party/fast_obj/fast_obj.h b/third-party/fast_obj/fast_obj.h
index a884472..bc6cf7c 100644
--- a/third-party/fast_obj/fast_obj.h
+++ b/third-party/fast_obj/fast_obj.h
@@ -297,58 +297,6 @@ static void* array_realloc(void* ptr, fastObjUInt n, fastObjUInt b)
 }
 
 
-static
-void* file_open(const char* path, void* user_data)
-{
-    (void)(user_data);
-    return fopen(path, "rb");
-}
-
-
-static
-void file_close(void* file, void* user_data)
-{
-    FILE* f;
-    (void)(user_data);
-    
-    f = (FILE*)(file);
-    fclose(f);
-}
-
-
-static
-size_t file_read(void* file, void* dst, size_t bytes, void* user_data)
-{
-    FILE* f;
-    (void)(user_data);
-    
-    f = (FILE*)(file);
-    return fread(dst, 1, bytes, f);
-}
-
-
-static
-unsigned long file_size(void* file, void* user_data)
-{
-    FILE* f;
-    long p;
-    long n;
-    (void)(user_data);
-
-    f = (FILE*)(file);
-
-    p = ftell(f);
-    fseek(f, 0, SEEK_END);
-    n = ftell(f);
-    fseek(f, p, SEEK_SET);
-
-    if (n > 0)
-        return (unsigned long)(n);
-    else
-        return 0;
-}
-
-
 static
 char* string_copy(const char* s, const char* e)
 {
@@ -1408,18 +1356,6 @@ void fast_obj_destroy(fastObjMesh* m)
 }
 
 
-fastObjMesh* fast_obj_read(const char* path)
-{
-    fastObjCallbacks callbacks;
-    callbacks.file_open = file_open;
-    callbacks.file_close = file_close;
-    callbacks.file_read = file_read;
-    callbacks.file_size = file_size;
-
-    return fast_obj_read_with_callbacks(path, &callbacks, 0);
-}
-
-
 fastObjMesh* fast_obj_read_with_callbacks(const char* path, const fastObjCallbacks* callbacks, void* user_data)
 {
     fastObjData  data;