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require 'tins/concern'
module Tins
module StringByteOrderMark
def bom_encoding
prefix = self[0, 4].force_encoding(Encoding::ASCII_8BIT)
case prefix
when /\A\xef\xbb\xbf/n then Encoding::UTF_8
when /\A\x00\x00\xff\xfe/n then Encoding::UTF_32BE
when /\A\xff\xfe\x00\x00/n then Encoding::UTF_32LE
when /\A\xfe\xff/n then Encoding::UTF_16BE
when /\A\xff\xfe/n then Encoding::UTF_16LE
when /\A\x2b\x2f\x76[\x38-\x39\x2b\x2f]/n then Encoding::UTF_7
when /\A\x84\x31\x95\x33/n then Encoding::GB18030
end
end
end
end
require 'tins/alias'
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