Ensure makefsdata.py generates valid variable names (#1841)

* Ensure makefsdata.py generates valid variable names

* Use mimetypes library in makefsdata.py

* Avoid generating duplicate variable names

src/rp2_common/pico_lwip/tools/makefsdata.py

@@ -1,30 +1,8 @@
 #!/usr/bin/env python3
 import argparse
+import mimetypes
 from pathlib import Path
-
-file_types = {
-    "html": "text/html",
-    "htm":  "text/html",
-    "shtml": "text/html",
-    "shtm": "text/html",
-    "ssi":  "text/html",
-    "gif":  "image/gif",
-    "png":  "image/png",
-    "jpg":  "image/jpeg",
-    "bmp":  "image/bmp",
-    "ico":  "image/x-icon",
-    "class": "application/octet-stream",
-    "cls":  "application/octet-stream",
-    "js":   "application/javascript",
-    "ram":  "application/javascript",
-    "css":  "text/css",
-    "swf":  "application/x-shockwave-flash",
-    "xml":  "text/xml",
-    "xsl":  "application/pdf",
-    "pdf":  "text/xml",
-    "json": "application/json",
-    "svg":  "image/svg+xml"
-}
+import re
 
 response_types = {
   200: "HTTP/1.0 200 OK",
@@ -41,9 +19,9 @@ def process_file(input_dir, file):
     results = []
 
     # Check content type
-    content_type = file_types[file.suffix[1:].lower()]
+    content_type, _ = mimetypes.guess_type(file)
     if content_type is None:
-        raise RuntimeError(f"Unsupported file type {file.suffix}")
+        content_type = "application/octet-stream"
 
     # file name
     data = f"/{file.relative_to(input_dir)}\x00"
@@ -103,8 +81,12 @@ def process_file_list(fd, input):
 
         # make a variable name
         var_name = str(file.relative_to(input_dir))
-        var_name = var_name.replace(".", "_")
-        var_name = var_name.replace("/", "_")
+        var_name = re.sub(r"\W+", "_", var_name, flags=re.ASCII)
+
+        # Add a suffix if the variable name is used already
+        if any(d["data_var"] == f"data_{var_name}" for d in data):
+            var_name += f"_{len(data)}"
+
         data_var = f"data_{var_name}"
         file_var = f"file_{var_name}"
 
@@ -121,7 +103,7 @@ def process_file_list(fd, input):
                 if byte_count % 16 == 0:
                     fd.write("\n")
             if byte_count % 16 != 0:
-                 fd.write("\n")
+                fd.write("\n")
         fd.write(f"}};\n\n")
 
         # set the flags
@@ -165,6 +147,11 @@ def run_tool():
     )
     args = parser.parse_args()
     print(args.input)
+
+    mimetypes.init()
+    for ext in [".shtml", ".shtm", ".ssi"]:
+        mimetypes.add_type("text/html", ext)
+
     with open(args.output, "w") as fd:
         process_file_list(fd, args.input)