twn_util: file_read() :images

src/twn_util.c

@@ -151,6 +151,39 @@ char *file_to_str(const char *path, size_t *out_len) {
     return str_out;
 }
 
+
+struct ImageCollectionData {
+    char *list;
+    size_t length;
+};
+static PHYSFS_EnumerateCallbackResult image_collection_callback(void *data,
+                                                                const char *origdir,
+                                                                const char *fname)
+{
+    struct ImageCollectionData *result = data;
+    (void)origdir;
+
+    /* TODO: settle down on supported images */
+    size_t file_len = SDL_strlen(fname);
+    size_t dir_len = SDL_strlen(origdir);
+
+    if (CHECK_ENDING(fname, file_len, ".png")) {
+        result->list = SDL_realloc(result->list, result->length + dir_len + file_len + 1);
+        if (result->length != 0)
+            result->list[result->length-1] = '\n';
+        SDL_strlcpy(&result->list[result->length], origdir, dir_len);
+        result->length += dir_len;
+        result->list[result->length-1] = '/';
+        SDL_strlcpy(&result->list[result->length], fname, file_len + 1);
+        result->length += file_len + 1;
+        result->list[result->length-1] = '\0';
+    }
+
+    return PHYSFS_ENUM_OK;
+}
+
+
+/* TODO: caching on file and operation inputs */
 static String *read_files;
 
 String file_read(char const *file, char const *operation) {
@@ -175,9 +208,8 @@ String file_read(char const *file, char const *operation) {
         arrpush(read_files, s);
 
         return s;
-    }
 
-    else if (SDL_strncmp(operation, ":binary", sizeof (":binary") - 1) == 0) {
+    } else if (SDL_strncmp(operation, ":binary", sizeof (":binary") - 1) == 0) {
         uint8_t *data;
         int64_t length = file_to_bytes(file, &data);
 
@@ -193,6 +225,19 @@ String file_read(char const *file, char const *operation) {
         bool exists = file_exists(file);
         return exists ? (String){"yes", 3} : (String){"no", 2};
 
+    } else if (SDL_strncmp(operation, ":images", sizeof (":images") - 1) == 0) {
+        struct ImageCollectionData list = {0};
+        if (PHYSFS_enumerate(file, image_collection_callback, &list) == 0) {
+            CRY_PHYSFS("Error enumerating images");
+            if (list.list) SDL_free(list.list);
+            return (String){NULL, 0};
+        }
+
+        String s = {(char *)list.list, (float)list.length - 1};
+        arrpush(read_files, s);
+
+        return s;
+
     } else
         log_warn("No valid operation specified by %s", operation);