multi-algorithm compression

 DACT compresses each block within the file with all its known algorithms and
 uses the block with the best compression ratio.
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 DACT can encrypt the compressed data with one of two algorithms.
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 Compression time for DACT is slow as each block is compressed multiple times.
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 Current supported compression algorithms include RLE, Delta, Text, Zlib,
 Modified Zlib, Bzip2 and Seminibble Encoding.