born as fork of https://github.com/ickerwx/pattern

renamed as gpattern to avoid confusion

main differences:

• by default, the script creates
• you can use anything that starts with c to create, and with o to find offset (i'm lazy...)
• you can specify pattern length both in decimal and hex (thanks phra)
• you can specify badchars as last arg using for example a three hex string like 0x41,\x42,43 ( this works just by expliciting create)

examples:

• ./gpattern c 60 # creates the same pattern
• ./gpattern create 60 # creates the same pattern
• ./gpattern c 0x3C # creates the same pattern
• ./gpattern c 0x3C 0x41,0x42 # creates a pattern given badchars 0x41 and 0x42
• ./gpattern 60 # creates the same pattern
• ./gpattern o a1Aa # given a default len of 8192, find offset for given pattern
• ./gpattern off a1Aa # same as above
• ./gpattern off a1Aa 10000 # same as above, but given a pattern len 10000
• ./gpattern off a1Aa 0x8000 # same as above, but given a pattern len 0x8000
• ./gpattern off a1Ca 0x8000 41,42 # same as above, but given a pattern len 0x8000 AND two badchars 0x41 0x42