In this guide I’ll show you how to safely extract your own BIOS files to use with PS2 and PS1 emulators, thanks to a new tool that works with the official Sony PS3 firmware update file. If (!wxFileName::FileExists(fileName) || !fileName.Lower().EndsWith(L".Last updated: 17FEB2023 (see Changelog for details) #include "CDVD/CompressedFileReaderUtils.h"īool ChdrFileReader::CanHandle(const wxString &fileName)
IMO it is pretty much the best at everything it seeks to be and makes it really straightforward to have a collection with one file per-game with no need to worry about CD vs DVD games or wasted space due to a format with better compression but worse features being available since CHD is already near the top in terms of its typical ratios. The tools that can manipulate CHDs are robust and flexible as well. tar.gz, I don't think it does).ĬHD has had stellar compression across all of my romsets for systems with emulators that support it.
This is also a problem for GZIP since it can't compress more than 1 file (not sure if PCSX2 supports. Additionally, ISO/CSO doesn't work for games with CD audio as that would require multiple files (ISO does not support multi-track). The only thing really comparable to CHD right now is CSO, but I've found slightly better compression ratios using GZIP for my PS2 games, though this has the issue of requiring index generation. I agree that support for this feature would be useful. 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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