STRLCPY/100-redteam-projects

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Projects/47_hexdump/HEXDUMP.md

1	+	# hexdump
2	+
3	+	````
4	+	read binary data from file given in arg1
5	+	output a table containing 10 byte rows
6	+	containing the data conversioned to hexadecimal pairs for readability
7	+	also we output the conversion to ascii text so we can read the strings contained in the document
8	+	````
9	+

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Projects/47_hexdump/hexdump.py

1	+	#!/usr/bin/python3
2	+
3	+
4	+	import os
5	+	import sys
6	+	import argparse
7	+
8	+
9	+	if __name__ == '__main__':
10	+	parser = argparse.ArgumentParser()
11	+	parser.add_argument("FILE", help="file to be dump", type=str)
12	+	parser.add_argument("-b", "--binary", help="display bytes in binary instead of hex", action="store_true")
13	+	args = parser.parse_args()
14	+
15	+	try:
16	+	with open(args.FILE, "rb") as f:
17	+	n = 0
18	+	b = f.read(16)
19	+	filesize = os.path.getsize(args.FILE)
20	+	print(f"Size {args.FILE}: {filesize} bytes - 0x{filesize:08x}")
21	+	while b:
22	+	if not args.binary:
23	+	s1 = " ".join([f"{i:02x}" for i in b]) # hex string
24	+	s1 = s1[0:23] + " " + s1[23:] # insert extra space between groups of 8 hex values
25	+	width = 48
26	+	else:
27	+	s1 = " ".join([f"{i:08b}" for i in b])
28	+	s1 = s1[0:71] + " " + s1[71:]
29	+	width = 144
30	+	s2 = "".join([chr(i) if 32 <= i <= 127 else "." for i in b]) # ascii string; chained comparison
31	+	print(f"{n * 16:08x} {s1:<{width}} \|{s2}\|")
32	+
33	+	n += 1
34	+	b = f.read(16)
35	+
36	+	except Exception as e:
37	+	print(__file__, ": ", type(e).__name__, " - ", e, sep="", file=sys.stderr)
38	+
39	+
40	+