1 files changed, 38 insertions, 0 deletions
diff --git a/src/open_lib.cpp b/src/open_lib.cpp
index 23ee79a0..ae387281 100644
--- a/src/open_lib.cpp
+++ b/src/open_lib.cpp
@@ -224,6 +224,16 @@ static bool is_rel_or_absolute_filename(const char *name)
             || (name[0] != '\0' && name[1] == ':' && strchr(dir_chars,name[2]));
 }
 
+static bool ignoreUserWritableDirectory()
+{
+    // Env var mostly for testing purposes and being independent from
+    // an existing installation
+    const char* envVarIgnoreUserWritableDirectory =
+        getenv("PROJ_IGNORE_USER_WRITABLE_DIRECTORY");
+    return envVarIgnoreUserWritableDirectory != nullptr &&
+           envVarIgnoreUserWritableDirectory[0] != '\0';
+}
+
 static void*
 pj_open_lib_internal(projCtx ctx, const char *name, const char *mode,
                      void* (*open_file)(projCtx, const char*, const char*),
@@ -279,6 +289,17 @@ pj_open_lib_internal(projCtx ctx, const char *name, const char *mode,
                     break;
             }
         }
+
+        else if( !ignoreUserWritableDirectory() &&
+                 (fid = open_file(ctx,
+                    (pj_context_get_user_writable_directory(ctx, false) +
+                     DIR_CHAR + name).c_str(), mode)) != nullptr ) {
+            fname = pj_context_get_user_writable_directory(ctx, false);
+            fname += DIR_CHAR;
+            fname += name;
+            sysname = fname.c_str();
+        }
+
         /* if is environment PROJ_LIB defined */
         else if ((sysname = getenv("PROJ_LIB")) != nullptr) {
             auto paths = NS_PROJ::internal::split(std::string(sysname), dirSeparator);
@@ -381,6 +402,23 @@ std::unique_ptr<NS_PROJ::File> NS_PROJ::FileManager::open_resource_file(
                             "Using %s", remote_file.c_str() );
                     pj_ctx_set_errno( ctx, 0 );
                 }
+            } else {
+                // For example for resource files like 'alaska'
+                auto remote_file_tif = remote_file + ".tif";
+                file = open(ctx, remote_file_tif.c_str());
+                if( file ) {
+                    pj_log( ctx, PJ_LOG_DEBUG_MAJOR,
+                            "Using %s", remote_file_tif.c_str() );
+                    pj_ctx_set_errno( ctx, 0 );
+                } else {
+                    // Init files
+                    file = open(ctx, remote_file.c_str());
+                    if( file ) {
+                        pj_log( ctx, PJ_LOG_DEBUG_MAJOR,
+                                "Using %s", remote_file.c_str() );
+                        pj_ctx_set_errno( ctx, 0 );
+                    }
+                }
             }
         }
     }