physfs-serve: simplify extension replacement

1 files changed, 20 insertions, 20 deletions

diff --git a/jni/physfs-serve-sdl-wrap.c b/jni/physfs-serve-sdl-wrap.c
index c0de9df..92b2290 100644
--- a/jni/physfs-serve-sdl-wrap.c
+++ b/jni/physfs-serve-sdl-wrap.c
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <stdio.h>
+#include <assert.h>
 
 static void ignore_ret(bool b, ...) {};
 #define ignore_ret(x) ignore_ret(true, x);
@@ -117,28 +118,27 @@ content_type(struct physfs_serve *serve, const char *path) {
 }
 
 static bool
+replace_ext(char buf[], const size_t bufsz, const char *old, const char *new) {
+   if (!physfs_ends_with(buf, old)) return false;
+   size_t len = strlen(buf);
+   assert(len >= strlen(old));
+   len -= strlen(old);
+   assert(bufsz >= len);
+   snprintf(buf + len, bufsz - len, "%s", new);
+   return true;
+}
+
+static bool
 path_rewrite(struct physfs_serve *serve, char buf[], const size_t bufsz, struct PHYSFS_Stat *st) {
    if (physfs_default_path_rewrite(serve, buf, bufsz, st)) return true;
-   if (physfs_ends_with(buf, ".rpgmvm")) {
-      buf[strlen(buf) - 1] = 'o';
-      if (st->filetype == -1 && PHYSFS_stat(buf, st)) return false;
-   } else if (physfs_ends_with(buf, ".rpgmvo")) {
-      buf[strlen(buf) - 1] = 'm';
-      if (st->filetype == -1 && PHYSFS_stat(buf, st)) return false;
-   } else if (physfs_ends_with(buf, ".webm")) {
-      buf[strlen(buf) - 1] = 0;
-      buf[strlen(buf) - 2] = '4';
-      buf[strlen(buf) - 3] = 'p';
-      buf[strlen(buf) - 4] = 'm';
-      if (st->filetype == -1 && PHYSFS_stat(buf, st)) return false;
-   } else if (physfs_ends_with(buf, ".mp4")) {
-      buf[strlen(buf) + 2] = 0;
-      buf[strlen(buf) + 1] = 'm';
-      buf[strlen(buf)] = 'b';
-      buf[strlen(buf) - 1] = 'e';
-      buf[strlen(buf) - 2] = 'w';
-      if (st->filetype == -1 && PHYSFS_stat(buf, st)) return false;
-   }
+   if (st->filetype != -1) return false;
+   if (replace_ext(buf, bufsz, ".rpgmvm", ".rpgmvo")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".rpgmvo", ".rpgmvm")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".webm", ".mp4")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".mp4", ".webm")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".png", ".rpgmvp")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".ogg", ".rpgmvo")) return PHYSFS_stat(buf, st);
+   else if (replace_ext(buf, bufsz, ".mp4", ".rpgmvm")) return PHYSFS_stat(buf, st);
    return false;
 }