mirror of
https://github.com/keylase/nvidia-patch
synced 2024-11-01 09:20:09 +00:00
141 lines
4.3 KiB
Python
Executable File
141 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
import sys
|
|
import argparse
|
|
import os.path
|
|
import itertools
|
|
|
|
PATCH_EXT = ".1337"
|
|
CRLF = b"\x0d\x0a"
|
|
HEADER_FORMAT = b">%s"
|
|
LINE_FORMAT = CRLF + b"%016X:%02X->%02X"
|
|
OFFSET_ADJUSTMENT = 0xC00
|
|
|
|
|
|
class ByteDiffException(Exception):
|
|
""" Base class for all exceptions """
|
|
pass
|
|
|
|
|
|
class LengthMismatchException(ByteDiffException):
|
|
""" Throwed when length of input sequences do not match """
|
|
pass
|
|
|
|
|
|
class DiffLimitException(ByteDiffException):
|
|
""" Throwed when difference limit hit """
|
|
pass
|
|
|
|
|
|
def check_positive_int(value):
|
|
value = int(value)
|
|
if value <= 0:
|
|
raise argparse.ArgumentTypeError(
|
|
"%s is an invalid positive number value" % value)
|
|
return value
|
|
|
|
|
|
def parse_args():
|
|
parser = argparse.ArgumentParser(
|
|
description="Make .1337 patch file from original and patched files")
|
|
parser.add_argument("orig_file",
|
|
metavar="ORIG_FILE",
|
|
help="original file")
|
|
parser.add_argument("patched_file",
|
|
metavar="PATCHED_FILE",
|
|
help="patched file")
|
|
parser.add_argument("output_file",
|
|
metavar="OUTPUT_FILE",
|
|
nargs='?',
|
|
help="filename for patch output. Default: basename of "
|
|
"original filename with .1337 extension")
|
|
parser.add_argument("-f", "--header-filename",
|
|
metavar="FILENAME",
|
|
help="filename specified in resulting patch header. "
|
|
"Default: basename of original filename.")
|
|
parser.add_argument("-l", "--limit",
|
|
help="stop after number of differences",
|
|
type=check_positive_int)
|
|
args = parser.parse_args()
|
|
return args
|
|
|
|
|
|
def feed_chunks(f, chunk_size=4096):
|
|
""" Reads file-like object with chunks having up to `chunk_size` length """
|
|
while True:
|
|
buf = f.read(chunk_size)
|
|
if not buf:
|
|
break
|
|
yield buf
|
|
|
|
|
|
def zip_files_bytes(left, right):
|
|
""" Iterate over two files, returning pair of bytes.
|
|
Throw LengthMismatch if file sizes is uneven. """
|
|
class EndMarker(object):
|
|
pass
|
|
end_marker = EndMarker()
|
|
|
|
left_iter = itertools.chain.from_iterable(
|
|
feed_chunks(left))
|
|
right_iter = itertools.chain.from_iterable(
|
|
feed_chunks(right))
|
|
for a, b in itertools.zip_longest(left_iter,
|
|
right_iter,
|
|
fillvalue=end_marker):
|
|
if a is end_marker or b is end_marker:
|
|
raise LengthMismatchException("Length of input files inequal.")
|
|
yield a, b
|
|
|
|
|
|
def diff(left, right, limit=None):
|
|
offset = 0
|
|
diff_count = 0
|
|
for a, b in zip_files_bytes(left, right):
|
|
if a != b:
|
|
diff_count += 1
|
|
if limit is not None and diff_count > limit:
|
|
raise DiffLimitException()
|
|
yield offset, a, b
|
|
offset += 1
|
|
|
|
|
|
def compose_diff_file(orig, patched, output, header, *,
|
|
limit=None, offset_adjustment=True):
|
|
output.write(HEADER_FORMAT % (header.encode('latin-1'),))
|
|
adj = OFFSET_ADJUSTMENT if offset_adjustment else 0
|
|
for offset, a, b in diff(orig, patched, limit):
|
|
output.write(LINE_FORMAT % (offset + adj, a, b))
|
|
|
|
|
|
def main():
|
|
args = parse_args()
|
|
|
|
output_filename = args.output_file
|
|
if not output_filename:
|
|
orig_bname = os.path.basename(args.orig_file)
|
|
before, _, after = orig_bname.rpartition('.')
|
|
orig_bname_noext = before if before else after
|
|
output_filename = orig_bname_noext + PATCH_EXT
|
|
|
|
header_filename = args.header_filename
|
|
if not header_filename:
|
|
header_filename = os.path.basename(args.orig_file)
|
|
|
|
with open(args.orig_file, 'rb') as orig,\
|
|
open(args.patched_file, 'rb') as patched,\
|
|
open(output_filename, 'wb') as output:
|
|
try:
|
|
compose_diff_file(orig, patched, output, header_filename,
|
|
limit=args.limit)
|
|
except LengthMismatchException:
|
|
print("Input files have inequal length. Aborting...",
|
|
file=sys.stderr)
|
|
except DiffLimitException:
|
|
print("Differences limit hit. Aborting...",
|
|
file=sys.stderr)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|