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Songlx516
8bee84bd49
Groundwork for 7z support (the second of the six format x volume
combinations). No engine code yet: this lands the vendor subset, real
fixtures and the end-to-end driver, so the engine has something to be
built and checked against.
Vendor (third_party/7z, LZMA SDK 26.03, public domain):
- decoder-only subset: 7zArcIn/7zDec container, Lzma/Lzma2/Ppmd7/Bcj2/
Bra/Delta codecs, Aes/Sha256 for the password channel to come
- the encoder half (LzmaEnc, Xz*, Sort, Threads, ...) is deliberately
not vendored; the engine never encodes
- README.md records two SDK limitations that shape the engine design:
* CSzFolder caps a folder at 4 coders / 3 bonds, so 7-Zip's own BCJ2
chain (BCJ2 + 4xLZMA2 = 5 coders) is refused by SzAr_DecodeFolder
even though SzArEx_Open parses it happily - the engine therefore
parses folder blobs and drives the codec chain itself
* the C decoder ships no 7zAES coder at all, so both -p and -mhe=on
archives are rejected until the engine implements it on top of the
vendored Aes.c / Sha256.c
Tests:
- make_sevenz_fixtures.py builds real archives with an actual 7-Zip
binary (7za from the Extra package; falls back to the reduced 7zr,
which has no PPMd encoder): store/lzma/lzma2/ppmd/bcj/delta/bcj2,
AES with plain and with encrypted headers, a 7-part -v100k volume
set, and UTF-8 entry names
- sevenz_e2e.c extracts an archive and validates every entry against
the stored CRC; it calls the wide-character file APIs on Windows, so
non-ASCII entry names are really created instead of silently failing
- run-sevenz-tests.sh builds the subset and the driver, then runs the
fixture matrix with an explicit KNOWN_GAPS list that fails loudly
when one of the gaps starts passing
Status: store, lzma, lzma2, ppmd, bcj, delta and utf8 all extract
byte-identical to the source tree (7/10). bcj2, aes, aeshe and
vol.7z.001 are the known gaps, each mapped to a specific piece of
engine work still to come.