Fixed C# files not getting approved

Problem was encoding: When you make a C# project, the .cs file is
encoded as "UTF-8 with BOM", meaning that there are three hidden symbols
in the beginning of the file.

commands/submit.py

@@ -16,6 +16,7 @@
 from helpers.config import getConfig, getUrl
 from commands.archive import archiveCommand
 from helpers.sound import losesound, winsound
+from helpers.fileutils import undoBOM
 
 
 class Response(Enum):
@@ -122,6 +123,7 @@ def postSubmission(config, session, problemName, programFile):
         data["mainclass"] = detectClassName(programFile)
 
     sub_files = []
+    undoBOM(programFile["relativePath"])
     with open(programFile["relativePath"]) as sub_file:
         sub_files.append(
             (

helpers/fileutils.py

@@ -41,3 +41,23 @@ def findProblemLocation(problemName):
         if os.path.exists(folder + problemName):
             return folder
     return None
+
+
+def undoBOM(path):
+    import sys, codecs
+    BUFSIZE = 4096
+    BOMLEN = len(codecs.BOM_UTF8)
+
+    with open(path, "r+b") as fp:
+        chunk = fp.read(BUFSIZE)
+        if chunk.startswith(codecs.BOM_UTF8):
+            i = 0
+            chunk = chunk[BOMLEN:]
+            while chunk:
+                fp.seek(i)
+                fp.write(chunk)
+                i += len(chunk)
+                fp.seek(BOMLEN, os.SEEK_CUR)
+                chunk = fp.read(BUFSIZE)
+            fp.seek(-BOMLEN, os.SEEK_CUR)
+            fp.truncate()