Convert map into an .o file

1 files changed, 77 insertions, 0 deletions

diff --git a/tools/map.py b/tools/map.py
new file mode 100755
index 0000000..2f3479a
--- /dev/null
+++ b/tools/map.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+
+from argparse import ArgumentParser
+import subprocess
+import os
+import json
+
+__version__ = "1.0"
+
+ld = os.environ.get("LD", "i586-pc-msdosdjgpp-ld")
+strip = os.environ.get("STRIP", "i586-pc-msdosdjgpp-strip")
+
+
+def get_layer(data, name):
+    for layer in data["layers"]:
+        if layer["name"] == name:
+            return layer
+    raise ValueError("Layer %s not found" % name)
+
+
+def main():
+    parser = ArgumentParser(
+        description="Tiled JSON Map to .o",
+        epilog="Copyright (C) 2023 Juan J Martinez <jjm@usebox.net>",
+    )
+
+    parser.add_argument(
+        "--version", action="version", version="%(prog)s " + __version__
+    )
+    parser.add_argument("file_json", help="JSON map to convert")
+    parser.add_argument("output", help="object name for the map data")
+
+    args = parser.parse_args()
+
+    with open(args.file_json, "rt") as fd:
+        data = json.load(fd)
+
+    if len(data["tilesets"]) != 1:
+        parser.error("Unsupported number of tilesets %d" % len(data["tilesets"]))
+
+    tileset = data["tilesets"][0]
+
+    map_layer = get_layer(data, "Map")
+
+    out = map(lambda x: x - tileset["firstgid"], map_layer["data"])
+
+    # TODO: process map entities
+
+    tmp = args.output.rstrip(".o")
+    with open(tmp, "wb") as fd:
+        fd.write(bytearray(out))
+        fd.flush()
+
+        # create an object file from the binary
+        rc = subprocess.call(
+            [
+                ld,
+                "-r",
+                "-b",
+                "binary",
+                "-o",
+                args.output,
+                tmp,
+            ]
+        )
+        os.unlink(tmp)
+        if rc != 0:
+            parser.error("Failed to run %s" % ld)
+
+        # strip unwanted symbols
+        rc = subprocess.call([strip, "-w", "-K", "*_%s_*" % tmp, args.output])
+        if rc != 0:
+            parser.error("Failed to run %s" % ld)
+
+
+if __name__ == "__main__":
+    main()