Add FS API layer

src/http.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "config.h"
+#include "fs.h"
 #include "net.h"
 #include "str.h"
 
@@ -23,7 +24,8 @@ struct mg_http_serve_opts {
   const char *root_dir;       // Web root directory, must be non-NULL
   const char *ssi_pattern;    // SSI file name pattern, e.g. #.shtml
   const char *extra_headers;  // Extra HTTP headers to add in responses
-  bool use_packed_fs;         // Serve files embedded into binary
+  const char *mime_types;     // Extra mime types, ext1=type1,ext2=type2,..
+  struct mg_fs *fs;           // Filesystem implementation. Use NULL for POSIX
 };
 
 // Parameter for mg_http_next_multipart
@@ -43,9 +45,9 @@ struct mg_connection *mg_http_listen(struct mg_mgr *, const char *url,
 struct mg_connection *mg_http_connect(struct mg_mgr *, const char *url,
                                       mg_event_handler_t fn, void *fn_data);
 void mg_http_serve_dir(struct mg_connection *, struct mg_http_message *hm,
-                       struct mg_http_serve_opts *);
-void mg_http_serve_file(struct mg_connection *, struct mg_http_message *,
-                        const char *, const char *mime, const char *headers);
+                       struct mg_http_serve_opts *opts);
+void mg_http_serve_file(struct mg_connection *, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts);
 void mg_http_reply(struct mg_connection *, int status_code, const char *headers,
                    const char *body_fmt, ...);
 struct mg_str *mg_http_get_header(struct mg_http_message *, const char *name);