From a91d8cdb19176ad356bce06ab2c0834f9ed5fe91 Mon Sep 17 00:00:00 2001
From: Noel Grandin <noel.grandin@collabora.co.uk>
Date: Sun, 20 Jun 2021 20:19:28 +0200
Subject: [PATCH] WIP

Change-Id: I4410d066b8a4d2fd2eb746a5dd8f4ee763a8aa3e
---
 sal/rtl/bootstrap.cxx | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/sal/rtl/bootstrap.cxx b/sal/rtl/bootstrap.cxx
index 45c330a56edb..bb7fe573376d 100644
--- a/sal/rtl/bootstrap.cxx
+++ b/sal/rtl/bootstrap.cxx
@@ -37,6 +37,7 @@
 #include <rtl/malformeduriexception.hxx>
 #include <rtl/uri.hxx>
 #include <sal/log.hxx>
+#include <o3tl/lru_map.hxx>
 
 #include <vector>
 #include <algorithm>
@@ -590,21 +591,35 @@ bootstrap_map_t bootstrap_map;
 
 rtlBootstrapHandle SAL_CALL rtl_bootstrap_args_open(rtl_uString * pIniName)
 {
-    OUString iniName( pIniName );
+    static o3tl::lru_map<OUString,OUString> fileUrlLookupCache(16);
+
+    OUString originalIniName( pIniName );
+    OUString iniName;
+
+    osl::ResettableMutexGuard guard(osl::Mutex::getGlobalMutex());
+    auto cacheIt = fileUrlLookupCache.find(originalIniName);
+    bool foundInCache = cacheIt != fileUrlLookupCache.end();
+    if (foundInCache)
+        iniName = cacheIt->second;
+    guard.clear();
 
     // normalize path
-    FileStatus status(osl_FileStatus_Mask_FileURL);
-    DirectoryItem dirItem;
-    if (DirectoryItem::get(iniName, dirItem) != DirectoryItem::E_None ||
-        dirItem.getFileStatus(status) != DirectoryItem::E_None)
+    if (iniName.isEmpty())
     {
-        return nullptr;
+        FileStatus status(osl_FileStatus_Mask_FileURL);
+        DirectoryItem dirItem;
+        if (DirectoryItem::get(iniName, dirItem) != DirectoryItem::E_None ||
+            dirItem.getFileStatus(status) != DirectoryItem::E_None)
+        {
+            return nullptr;
+        }
+        iniName = status.getFileURL();
     }
 
-    iniName = status.getFileURL();
-
+    guard.reset();
+    if (!foundInCache)
+        fileUrlLookupCache.insert({originalIniName, iniName});
     Bootstrap_Impl * that;
-    osl::ResettableMutexGuard guard(osl::Mutex::getGlobalMutex());
     auto iFind(bootstrap_map.find(iniName));
     if (iFind == bootstrap_map.end())
     {
-- 
2.27.0