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<blockquote data-quote="FAST6191" data-source="post: 10116353" data-attributes="member: 32303"><p>Have you tried anything? Assuming none of the tools made to handle the other uses are working (or this is a different format with the same name/extension).</p><p></p><p>Most compression is fairly similar in general nature until you hit compression contests (at which point compression = AI appears).</p><p></p><p><a href="https://ece.uwaterloo.ca/~ece611/LempelZiv.pdf" target="_blank">https://ece.uwaterloo.ca/~ece611/LempelZiv.pdf</a> is my usual choice for a primer on compression (and despite the name/title gives a decent overview of Huffman as well).</p><p></p><p>Grab a copy of the decompressed file from memory and compare the two.</p><p></p><p>LZ family compression tends to be a matter of [data][flag to say if compressed or not for the next section][compression split indicator* if compressed][more data][repeat until file end], and maybe something at the start to indicate it is compressed and what the final file size might be.</p><p></p><p>*so many bytes back (or maybe forward if it is a fancy one that does both directions) and how many to read (usually with a bit of maths as there is no point in telling it to read fewer bytes than the compression split indicator thing takes up). Custom changes to this break existing tools in a hurry, but are trivial to recompile with adjustments.</p><p><a href="https://www.romhacking.net/utilities/826/" target="_blank">https://www.romhacking.net/utilities/826/</a> is for the GBA and DS BIOS compressions but should be a reasonable jumping off point if whatever is out there for this system are not so hot.</p></blockquote><p></p>
[QUOTE="FAST6191, post: 10116353, member: 32303"] Have you tried anything? Assuming none of the tools made to handle the other uses are working (or this is a different format with the same name/extension). Most compression is fairly similar in general nature until you hit compression contests (at which point compression = AI appears). [URL]https://ece.uwaterloo.ca/~ece611/LempelZiv.pdf[/URL] is my usual choice for a primer on compression (and despite the name/title gives a decent overview of Huffman as well). Grab a copy of the decompressed file from memory and compare the two. LZ family compression tends to be a matter of [data][flag to say if compressed or not for the next section][compression split indicator* if compressed][more data][repeat until file end], and maybe something at the start to indicate it is compressed and what the final file size might be. *so many bytes back (or maybe forward if it is a fancy one that does both directions) and how many to read (usually with a bit of maths as there is no point in telling it to read fewer bytes than the compression split indicator thing takes up). Custom changes to this break existing tools in a hurry, but are trivial to recompile with adjustments. [URL]https://www.romhacking.net/utilities/826/[/URL] is for the GBA and DS BIOS compressions but should be a reasonable jumping off point if whatever is out there for this system are not so hot. [/QUOTE]
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