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    RunLength decoder (Adobe version) implementation based on PDF Reference
    version 1.4 section 3.3.4:
        The RunLengthDecode filter decodes data that has been encoded in a
        simple byte-oriented format based on run length. The encoded data
        is a sequence of runs, where each run consists of a length byte
        followed by 1 to 128 bytes of data. If the length byte is in the
        range 0 to 127, the following length + 1 (1 to 128) bytes are
        copied literally during decompression. If length is in the range
        129 to 255, the following single byte is to be copied 257 - length
        (2 to 128) times during decompression. A length value of 128
        denotes EOD.
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