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# encoding: binary
# This was written by Arai-san and published at
# http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/31987
module HexDump
# str must be in BINARY encoding in 1.9
def encode(str)
offset = 0
result = []
while raw = str.slice(offset, 16) and raw.length > 0
# data field
data = ''
for v in raw.unpack('N* a*')
if v.kind_of? Integer
data << sprintf("%08x ", v)
else
v.each_byte {|c| data << sprintf("%02x", c) }
end
end
# text field
text = raw.tr("\000-\037\177-\377", ".")
result << sprintf("%08x %-36s %s", offset, data, text)
offset += 16
# omit duplicate line
if /^(#{regex_quote_n(raw)})+/n =~ str[offset .. -1]
result << sprintf("%08x ...", offset)
offset += $&.length
# should print at the end
if offset == str.length
result << sprintf("%08x %-36s %s", offset-16, data, text)
end
end
end
result
end
module_function :encode
if RUBY_VERSION >= "1.9"
# raw must be in BINARY encoding in 1.9
def self.regex_quote_n(raw)
Regexp.quote(raw)
end
else
def self.regex_quote_n(raw)
Regexp.quote(raw, 'n')
end
end
end
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