Method: Origami::Filter::ASCII85#encode

Defined in:
lib/origami/filters/ascii.rb

#encode(stream) ⇒ Object

Encodes given data into base85.

stream

The data to encode.



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# File 'lib/origami/filters/ascii.rb', line 80

def encode(stream)
    i = 0
    code = ::String.new.b
    input = stream.dup

    while i < input.size do

        if input.length - i < 4
            addend = 4 - (input.length - i)
            input << "\0" * addend
        else
            addend = 0
        end

        # Encode the 4 bytes input value into a 5 character string.
        value = input[i, 4].unpack("L>")[0]
        outblock = encode_block(value)

        outblock = "z" if outblock == "!!!!!" and addend == 0

        if addend != 0
            outblock = outblock[0, 4 - addend + 1]
        end

        code << outblock

        i = i + 4
    end

    code
end