[CDG5] Random questions

Jason Duerstock jason.duerstock at gmail.com
Fri Dec 14 11:12:43 AWST 2018


The "tome" format uses this "InstaCompOne" algorithm.  It's possible
they recycled that for resource compression as well.
On Thu, Dec 13, 2018 at 9:52 PM Max Poliakovski
<maximumspatium at googlemail.com> wrote:
>
> Hi guys,
>
>> Good call on the Huffman code. Any chance it could be a well known algo?
>
>
> Our mysterious compression method #3 looks like a variant of Deflate; it's based on the same principles: matching and reusing of already encoded data and Huffman coding.
>
> The decompression code includes two copy routines: one for copying data pointed by a backward distance and another one for copying bits directly from source to destination. They are controlled by various Huffman codes implemented as bit-crunching subroutines. There are 15 such subroutines corresponding to 15 various variable-length coding tables.
>
> As opposite to Deflate, OS9 novel Rez compression doesn't have any headers, just raw Huffman codes interleaved with plain-text data...
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