LZ4 Compression 1.3.0

The first release of LZ4 Compression: LZ4 packs for PS5 games, made right on
the console.

LZ4 asset packs

• Compress with LZ4 packs game data into seekable LZ4 packs that APR-EMU
  reads while the game runs. Executables, system files and already-compressed
  media stay loose.
• Works on any game that uses AMPR, not just the ones that ship APR-EMU. The
  app checks the game's eboot.bin and sce_module for libSceAmpr, and
  when there's no fakelib/libSceAmpr.sprx it adds the pack-capable APR-EMU
  runtime for you. Games that don't use AMPR get .ffpfsc compression
  instead.
• Compression level from 1 to 12, the same scale as Lazy_AMPR. 1 to 4 use
  LZ4's fast mode, 5 to 12 use LZ4 HC, and 9 is the default.
• Automatic profile, or your own ampr_pack TOML. Import config finds
  TOMLs on a USB drive or in /data/LZ4Compression/import and puts the ones
  named after the game first. You can also upload them from a PC or phone.
• Works on game folders and on .exfat and .ffpfs images. ShadowMount+
  only mounts images while a game runs, so the app mounts them itself for the
  job.
• Write the packed game next to the original, to the internal SSD or to
  external storage, or pack a folder in place to use the least free space.
• Every packed file is compared byte for byte with the original before
  anything is removed.
• Verify LZ4 Packs checks every block, and Uncompress LZ4 gives you back
  the normal loose game.

The app

• A native PS5 app (PPSA99420), no browser. D-pad and stick navigation,
  controller vibration, and Circle goes back.
• Your games run left to right like the home screen, every game opens its
  own page, and every action opens as a full page.
• The engine (lz4-compression.elf) does the work, and the app starts it
  through Payload Manager when it isn't running. The web page on port 5920
  is still there for a PC or phone.

It also does .ffpfsc compression and uncompression, exFAT/PFS images,
validate and repair, APR-EMU versions, and copy and move.

Install

1. Add lz4-compression.elf to Payload Manager, so it sits at
   /data/pldmgr/payloads/lz4-compression/lz4-compression.elf.
2. Unzip LZ4-Compression-PPSA99420.zip and copy the PPSA99420 folder to
   /data/homebrew/PPSA99420 over FTP. ShadowMount+ adds the
   LZ4 Compression tile (close any running game if it doesn't show up).
3. Open the tile.

Tested on firmware 13.60 with Payload Manager, kstuff and ShadowMount+ 1.7.
It has its own tile, port (5920) and settings folder
(/data/LZ4Compression), so it can be installed next to Game Compressor.

Keep your original game until you've launched the packed version.