cmd/hexdump.py

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1.8 KiB
Python
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2019-06-12 05:41:31 +00:00
import argparse
import sys
DEFAULT_WIDTH = 16
def hexy(i, width=0):
return hex(i)[2:].upper().rjust(width, '0')
def hexdump(handle, width=DEFAULT_WIDTH, ellipse=False, start=None, end=None):
if start is not None:
start = int(start, 16)
handle.seek(start)
address = start
else:
address = 0
if end is not None:
end = int(end, 16)
did_ellipse = False
previous_line = None
while True:
if end is not None:
if address > end:
break
this_width = min(width, end - address)
else:
this_width = width
line = handle.read(this_width)
if not line:
break
line = [hexy(x, 2) for x in line]
line = ' '.join(line)
if ellipse:
if line == previous_line:
if not did_ellipse:
print('...')
did_ellipse = True
address += width
continue
previous_line = line
print('%s | ' % hexy(address, 8), end='', flush=False)
print(line)
address += width
def hexdump_argparse(args):
handle = open(args.filename, 'rb')
return hexdump(handle, width=args.width, ellipse=args.ellipse, start=args.start, end=args.end)
def main(argv):
parser = argparse.ArgumentParser()
parser.add_argument('filename')
parser.add_argument('--width', dest='width', default=DEFAULT_WIDTH, type=int)
parser.add_argument('--start', dest='start', default=None)
parser.add_argument('--end', dest='end', default=None)
parser.add_argument('--ellipse', dest='ellipse', action='store_true')
parser.set_defaults(func=hexdump_argparse)
args = parser.parse_args(argv)
args.func(args)
if __name__ == '__main__':
main(sys.argv[1:])