From 34865a8ef1723b9469a9abf50dd8bcf94c22f27a Mon Sep 17 00:00:00 2001
From: Misa <infoteddy@infoteddy.info>
Date: Sat, 6 Mar 2021 10:48:02 -0800
Subject: [PATCH] Add FILESYSTEM_isAssetMounted()

This function will check if a specific file is a mounted per-level
custom asset, instead of being a variable that's true if ANY file is a
mounted asset.
---
 desktop_version/src/FileSystemUtils.cpp | 20 ++++++++++++++++++++
 desktop_version/src/FileSystemUtils.h   |  1 +
 2 files changed, 21 insertions(+)

diff --git a/desktop_version/src/FileSystemUtils.cpp b/desktop_version/src/FileSystemUtils.cpp
index 24b6d5d5..a93f936d 100644
--- a/desktop_version/src/FileSystemUtils.cpp
+++ b/desktop_version/src/FileSystemUtils.cpp
@@ -361,6 +361,26 @@ void FILESYSTEM_unmountassets(void)
 	FILESYSTEM_assetsmounted = false;
 }
 
+bool FILESYSTEM_isAssetMounted(const char* filename)
+{
+	const char* realDir;
+
+	/* Fast path */
+	if (assetDir[0] == '\0')
+	{
+		return false;
+	}
+
+	realDir = PHYSFS_getRealDir(filename);
+
+	if (realDir == NULL)
+	{
+		return false;
+	}
+
+	return SDL_strcmp(assetDir, realDir) == 0;
+}
+
 void FILESYSTEM_freeMemory(unsigned char **mem);
 
 void FILESYSTEM_loadFileToMemory(
diff --git a/desktop_version/src/FileSystemUtils.h b/desktop_version/src/FileSystemUtils.h
index f3aee2e3..e9c885f8 100644
--- a/desktop_version/src/FileSystemUtils.h
+++ b/desktop_version/src/FileSystemUtils.h
@@ -20,6 +20,7 @@ void FILESYSTEM_loadZip(const char* filename);
 extern bool FILESYSTEM_assetsmounted;
 void FILESYSTEM_mountassets(const char *path);
 void FILESYSTEM_unmountassets(void);
+bool FILESYSTEM_isAssetMounted(const char* filename);
 
 void FILESYSTEM_loadFileToMemory(const char *name, unsigned char **mem,
                                  size_t *len, bool addnull = false);