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@mooware
Created April 2, 2013 20:24
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Python script that takes lines of text containing byte hex values, and appends a printable representation of the bytes to each line. It's similar to xxd, but it takes already dumped bytes instead of the original binary data. Example: "70 79 74 68 6f 6e" -> "70 79 74 68 6f 6e python"
#!/usr/bin/env python
import fileinput
import re
# pattern to match lines of hex byte values
PATTERN = re.compile("^[a-zA-Z0-9]{1,2}( [a-zA-Z0-9]{1,2})*$")
# margin between bytes and text
MARGIN = 2
# expected number of bytes for which the text is aligned
MINBYTES = 16
# expected width of a line of bytes
MINLINELEN = MINBYTES * 3 - 1
# translate hex byte string to printable character
def translate(bytestr):
value = int(bytestr, 16)
if 32 <= value <= 127:
return chr(value)
else:
return "."
for line in fileinput.input():
# eat newline
line = line.strip()
if PATTERN.match(line):
# translate the bytes
text = "".join(map(translate, line.split(" ")))
# calculate the margin
linelen = max(MINLINELEN, len(line))
# append to the original line
line += (" " * (linelen - len(line) + MARGIN))
line += text
print line
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