Initial commit

scripts/cfe-partition-tag.py

@@ -0,0 +1,139 @@
+#!/usr/bin/env python3
+
+"""
+CFE Partition Tag
+
+{
+	u32 part_id;
+	u32 part_size;
+	u16 flags;
+	char part_name[33];
+	char part_version[21];
+	u32 part_crc32;
+}
+
+"""
+
+import argparse
+import os
+import struct
+import binascii
+
+
+PART_NAME_SIZE = 33
+PART_VERSION_SIZE = 21
+
+
+def auto_int(x):
+    return int(x, 0)
+
+
+def str_to_bytes_pad(string, size):
+    str_bytes = string.encode()
+    num_bytes = len(str_bytes)
+    if num_bytes >= size:
+        str_bytes = str_bytes[: size - 1] + "\0".encode()
+    else:
+        str_bytes += "\0".encode() * (size - num_bytes)
+    return str_bytes
+
+
+def create_tag(args, in_bytes, size):
+    # JAM CRC32 is bitwise not and unsigned
+    crc = ~binascii.crc32(in_bytes) & 0xFFFFFFFF
+
+    tag = bytearray()
+    tag += struct.pack(">I", args.part_id)
+    tag += struct.pack(">I", size)
+    tag += struct.pack(">H", args.part_flags)
+    tag += str_to_bytes_pad(args.part_name, PART_NAME_SIZE)
+    tag += str_to_bytes_pad(args.part_version, PART_VERSION_SIZE)
+    tag += struct.pack(">I", crc)
+
+    return tag
+
+
+def create_output(args):
+    in_st = os.stat(args.input_file)
+    in_size = in_st.st_size
+
+    in_f = open(args.input_file, "r+b")
+    in_bytes = in_f.read(in_size)
+    in_f.close()
+
+    tag = create_tag(args, in_bytes, in_size)
+
+    out_f = open(args.output_file, "w+b")
+    out_f.write(tag)
+    out_f.close()
+
+
+def main():
+    global args
+
+    parser = argparse.ArgumentParser(description="")
+
+    parser.add_argument(
+        "--flags",
+        dest="part_flags",
+        action="store",
+        type=auto_int,
+        help="Partition Flags",
+    )
+
+    parser.add_argument(
+        "--id",
+        dest="part_id",
+        action="store",
+        type=auto_int,
+        help="Partition ID",
+    )
+
+    parser.add_argument(
+        "--input-file",
+        dest="input_file",
+        action="store",
+        type=str,
+        help="Input file",
+    )
+
+    parser.add_argument(
+        "--output-file",
+        dest="output_file",
+        action="store",
+        type=str,
+        help="Output file",
+    )
+
+    parser.add_argument(
+        "--name",
+        dest="part_name",
+        action="store",
+        type=str,
+        help="Partition Name",
+    )
+
+    parser.add_argument(
+        "--version",
+        dest="part_version",
+        action="store",
+        type=str,
+        help="Partition Version",
+    )
+
+    args = parser.parse_args()
+
+    if (
+        (not args.part_flags)
+        or (not args.part_id)
+        or (not args.input_file)
+        or (not args.output_file)
+        or (not args.part_name)
+        or (not args.part_version)
+    ):
+        parser.print_help()
+    else:
+        create_output(args)
+
+
+main()