(DAT/CSPACK): support version 1. #477
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* Version check now only compares against ASCII `"CsPack"`. Version is then calculated/validated from the byte at offset 6: `'1'` or `'2'` (`Signature` property remains unchanged). * Entry size is now calculated based on version: `12` or `24` bytes. * Entry count of `0` is now explicitly allowed (as it's supported *and* has been observed in CatSystem releases). * `CsNameDecryptor` requires an additional argument: `extension_pos`. This replaces usage of `0x10` for extension check (which is specific to the `CsPack2` version).
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Add support for early CatSystem archive version
CsPack1inArcDAT.cs.Changes
"CsPack". Version is then calculated/validated from the byte at offset 6:'1'or'2'(Signatureproperty remains unchanged).12or24bytes.0is now explicitly allowed (as it's supported and has been observed in CatSystem releases).CsNameDecryptorrequires an additional argument:extension_pos. This replaces usage of0x10for extension check (which is specific to theCsPack2version).About CsPack1 and version differences
Research is based off early CatSystem trial games: Purupuru Magic and Remel
CsPack1archives never use.datextensions, and instead use extensions that reflect the contents of the archive. It's safer to say its extension is a wildcard:*(whileCsPack2still always uses.datextension).CsPackarchives may contain 0 entries, as observed with Cradle Song trial/cs_vl.dat.CsPack1andCsPack2archive versions are identical with exception to entry size and name decoding constants.CsPack1uses an8.3filename.CsPack2uses a (very broken)16.3(/26.0) filename.CsPack1filename decoding is broken in newer engines supportingCsPack2(so it cannot be reliably confirmed from them)