5 Commits

Author	SHA1	Message	Date
Kevin Bortis	6be36b6bda	Add Zstandard compression support ... Implements zstd as an alternative to LZMA for data block and subchannel compression using the allocated compression IDs 4 (kCompressionZstd) and 5 (kCompressionZstdCst). Adds zstd v1.5.7 as a bundled submodule with a static library build including x86_64 assembly fast path for decompression. Write path selects zstd or LZMA based on the zstd option. Subchannel blocks use zstd+CST instead of LZMA+CST when enabled. LZMA properties header is only written for LZMA-based compression types, preventing format corruption in zstd-compressed images. Activated via options string: "zstd=true;zstd_level=19". Default remains LZMA for backwards compatibility. Tested: SHA-256 verified lossless roundtrips across 9 disc systems (Dreamcast, Saturn, Mega CD, PC Engine CD, Neo Geo CD, PS1, PS2 CD, PS2 DVD) and PS1 SBI subchannel preservation with zstd+CST.	2026-03-19 08:45:07 +01:00
Natalia Portillo	050810c91d	Update copyright year to 2026.	2025-12-23 08:23:40 +00:00
Natalia Portillo	5c7610c1c0	Use heuristics to setup table shift.	2025-10-02 04:40:16 +01:00
Natalia Portillo	41aee42c53	Enhance documentation for various structures with detailed descriptions and formatting improvements	2025-10-01 05:35:39 +01:00
Natalia Portillo	3b012797cb	Implement creating AaruFormat image and writing header.	2025-08-07 15:43:35 +01:00