stringtobytes

#!/usr/bin/env python
#
# Example:
# $ sudo dtruss -n firefox -t write |& stringtobytes '^ [0-9]*/[0-9]*:  write\(.*?, "(.*)",.*$' 1

import sys
import re
import string

class Reader(object):
    @staticmethod
    def fromargs(args):
        regex = None
        group = 0

        if len(args) >= 2:
            regex = args[1]

        if len(args) >= 3:
            group = int(args[2])

        return Reader(regex, group)



    def __init__(self, regex=None, group=0):
        if regex is not None:
            self.regex = re.compile(regex)
            self.group = group

        else:
            self.regex = None
            self.group = None


    def string_data(self, line):
        if self.regex is not None:
            return self.match(line).group(0)

        return line

    def hex_data(self, line):
        if not all([c in string.printable for c in line]):
            return ' '.join(map(lambda x: hex(ord(x)),
                                list(line.decode('string-escape'))))

        return line

    def hex_line(self, line):
        if self.regex:
            m = self.regex.match(line)

            if m:
                s,e = m.start(self.group), m.end(self.group)
                return line[:s] + self.hex_data(line) + line[e:]

        return self.hex_data(line)

def main ():
    reader = Reader.fromargs(sys.argv)

    print "Group:", reader.group
    line = sys.stdin.readline()
    while line:
        sys.stdout.write(reader.hex_line(line) + "\n")
        sys.stdout.flush()

        line = sys.stdin.readline()


if __name__ == "__main__":
    main()