From 581208b2ffeeb2a2128aee0741fa3fd9e46358e2 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tomasz@kramkow.ski>
Date: Wed, 6 Aug 2025 17:50:53 +0100
Subject: Run black on all first party python code

---
 scripts/update_chitu.py | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

(limited to 'scripts/update_chitu.py')

diff --git a/scripts/update_chitu.py b/scripts/update_chitu.py
index cf7fcfe9..62145371 100755
--- a/scripts/update_chitu.py
+++ b/scripts/update_chitu.py
@@ -11,14 +11,16 @@ import uuid
 import sys
 import hashlib
 
+
 def calculate_crc(contents, seed):
-    accumulating_xor_value = seed;
+    accumulating_xor_value = seed
 
     for i in range(0, len(contents), 4):
-        value = struct.unpack('<I', contents[ i : i + 4])[0]
+        value = struct.unpack("<I", contents[i : i + 4])[0]
         accumulating_xor_value = accumulating_xor_value ^ value
     return accumulating_xor_value
 
+
 def xor_block(r0, r1, block_number, block_size, file_key):
     # This is the loop counter
     loop_counter = 0x0
@@ -27,17 +29,17 @@ def xor_block(r0, r1, block_number, block_size, file_key):
     key_length = 0x18
 
     # This is an initial seed
-    xor_seed = 0x4bad
+    xor_seed = 0x4BAD
 
     # This is the block counter
     block_number = xor_seed * block_number
 
-    #load the xor key from the file
-    r7 =  file_key
+    # load the xor key from the file
+    r7 = file_key
 
     for loop_counter in range(0, block_size):
         # meant to make sure different bits of the key are used.
-        xor_seed = int(loop_counter/key_length)
+        xor_seed = int(loop_counter / key_length)
 
         # IP is a scratch register / R12
         ip = loop_counter - (key_length * xor_seed)
@@ -57,10 +59,10 @@ def xor_block(r0, r1, block_number, block_size, file_key):
         # and then with IP
         xor_seed = xor_seed ^ ip
 
-        #Now store the byte back
+        # Now store the byte back
         r1[loop_counter] = xor_seed & 0xFF
 
-        #increment the loop_counter
+        # increment the loop_counter
         loop_counter = loop_counter + 1
 
 
@@ -74,12 +76,12 @@ def encode_file(input, output_file, file_length):
     print("Update UUID ", uid_value)
     file_key = int(uid_value.hex[0:8], 16)
 
-    xor_crc = 0xef3d4323;
+    xor_crc = 0xEF3D4323
 
     # the input file is expected to be in chunks of 0x800
     # so round the size
     while len(input_file) % block_size != 0:
-        input_file.extend(b'0x0')
+        input_file.extend(b"0x0")
 
     # write the file header
     output_file.write(struct.pack(">I", 0x443D2D3F))
@@ -88,15 +90,15 @@ def encode_file(input, output_file, file_length):
     # write the file_key
     output_file.write(struct.pack("<I", file_key))
 
-    #TODO - how to enforce that the firmware aligns to block boundaries?
+    # TODO - how to enforce that the firmware aligns to block boundaries?
     block_count = int(len(input_file) / block_size)
     print("Block Count is ", block_count)
     for block_number in range(0, block_count):
-        block_offset = (block_number * block_size)
+        block_offset = block_number * block_size
         block_end = block_offset + block_size
-        block_array = bytearray(input_file[block_offset: block_end])
+        block_array = bytearray(input_file[block_offset:block_end])
         xor_block(block_array, block_array, block_number, block_size, file_key)
-        for n in range (0, block_size):
+        for n in range(0, block_size):
             input_file[block_offset + n] = block_array[n]
 
         # update the expected CRC value.
@@ -109,6 +111,7 @@ def encode_file(input, output_file, file_length):
     output_file.write(input_file)
     return
 
+
 def main():
     if len(sys.argv) != 3:
         print("Usage: update_chitu <input_file> <output_file>")
@@ -132,5 +135,6 @@ def main():
 
     print("Encoding complete.")
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     main()
-- 
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