Made the memory backend, should somewhat work

platform/file.c

@@ -18,6 +18,20 @@
 #define __miniffs_internal
 #include <miniffs.h>
 
+/* Exported API */
+miniffs_t *miniffs_openfs(char *host_file)
+{
+    return NULL;
+}
+
+
+/* Some internal functions */
+void *miniffs_getfileaddr(miniffs_t *fs, fileentry_t *fent)
+{
+
+}
+
+
 size_t host_map_file(char *filename, char **dest)
 {
     char *ret_ptr;

platform/memory.c

@@ -7,4 +7,40 @@
  ******************************************************************************/
 
 #define __miniffs_internal
-#include <miniffs.h>
+#include <miniffs.h>
+
+#include <stdlib.h>
+
+/* Public API */
+miniffs_t *miniffs_openfs(uintptr_t address)
+{
+    miniffs_t *fs = (miniffs_t *)calloc(1, sizeof(miniffs_t));
+    if (fs == NULL)
+    {
+        miniffs_seterror(MINIFFS_ALLOCATION_ERROR);
+        goto exit;
+    }
+
+    fs->header = (miniffs_header_t *)address;
+
+    if (!miniffs_isvalidfs(fs))
+    {
+        miniffs_seterror(MINIFFS_INVALID_FS);
+        goto free_and_exit;
+    }
+
+    goto exit;
+
+free_and_exit:
+    free(fs);
+    fs = NULL;
+
+exit:
+    return fs;
+}
+
+/* Private API */
+void *miniffs_getfileaddr(miniffs_t *fs, fileentry_t *fent)
+{
+    return fs->memoryOffset + fent->offset;
+}