As it is, CSO support in PCSX2 (or PPSSPP) is quite fast, and only gets slower if you layer in the complicated caching layer used in PCSX2's GZ support.Įdit: that the XZ pull uses a file in /tmp to decompress to as a "cache" is slightly horrifying, but I'm sure the support will improve. On powerful desktops, this probably won't matter, but that's why I wasn't very excited about this change - personally - for PPSSPP in hrydgard/ppsspp#10417. Just to note: CHD is likely to decompress slower than CSO. Therefore it isn't really appropriate for Mode 2 PS1 games (see ISO file not aligned to sector size unknownbrackets/maxcso#13.) The existence of such tools doesn't really make CSO itself lossy.ĬSO, at least maxcso and the support in PCSX2, doesn't support files not a clean multiple of 2048 bytes. This is a destructive change, but such a tool could exist for CHD or gzip files. There are some CSO creation tools that are ALSO able to strip files (such as movies) from discs. If you decompress a CSO, you get the original ISO - just as with zlib. It basically applies raw zlib compression at an adjustable block size level + embedded index. The "CSO" format, used primarily for PSP and PS2 games, is LOSSLESS and totally separate. It is supported by Dolphin and involves deleting parts of the disc that have random data and are not accessible by games anyway. There are two formats sometimes referred to as CSO.
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