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unescape_bytea(s) private

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# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 408
        def unescape_bytea(s)
          if PGconn.respond_to? :unescape_bytea
            self.class.send(:define_method, :unescape_bytea) do |s|
              PGconn.unescape_bytea(s) if s
            end
          else
            self.class.send(:define_method, :unescape_bytea) do |s|
              if s
                result = ''
                i, max = 0, s.size
                while i < max
                  char = s[i]
                  if char == ?\\
                    if s[i+1] == ?\\
                      char = ?\\
                      i += 1
                    else
                      char = s[i+1..i+3].oct
                      i += 3
                    end
                  end
                  result << char
                  i += 1
                end
                result
              end
            end
          end
          unescape_bytea(s)
        end
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