scripts: move makepak.py from android project repo to engine main repo, port to python3, replace spaces by tabs

scripts/makepak.py

@@ -0,0 +1,46 @@
+from __future__ import print_function
+import sys
+import struct
+import os
+
+#dummy class for stuffing the file headers into
+class FileEntry:
+	pass
+
+#arguments are source directory, then target filename e.g. "pak1.pak"
+rootdir = sys.argv[1]
+pakfilename = sys.argv[2]
+
+pakfile = open(pakfilename,"wb")
+
+#write a dummy header to start with
+pakfile.write(struct.Struct("<4s2l").pack(b"PACK",0,0))
+
+#walk the directory recursively, add the files and record the file entries
+offset = 12
+fileentries = []
+for root, subFolders, files in os.walk(rootdir):
+	for file in files:
+		entry = FileEntry()
+		impfilename = os.path.join(root,file)
+		entry.filename = os.path.relpath(impfilename,rootdir).replace("\\","/")
+		if(entry.filename.startswith(".git")):continue
+		print("pak: "+entry.filename)
+		with open(impfilename, "rb") as importfile:
+			pakfile.write(importfile.read())
+			entry.offset = offset
+			entry.length = importfile.tell()
+			offset = offset + entry.length
+		fileentries.append(entry)
+tablesize = 0
+
+#after all the file data, write the list of entries
+for entry in fileentries:
+	pakfile.write(struct.Struct("<56s").pack(entry.filename.encode("ascii")))
+	pakfile.write(struct.Struct("<l").pack(entry.offset))
+	pakfile.write(struct.Struct("<l").pack(entry.length))
+	tablesize = tablesize + 64
+
+#return to the header and write the values correctly
+pakfile.seek(0)
+pakfile.write(struct.Struct("<4s2l").pack(b"PACK",offset,tablesize))