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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.
178 lines
3.3 KiB
Plaintext
178 lines
3.3 KiB
Plaintext
7-Zip method IDs for 7z and xz archives
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---------------------------------------
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Version: 24.02
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Date: 2024-03-22
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Each compression or crypto method in 7z is associated with unique binary value (ID).
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The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes).
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xz and 7z formats use same ID map.
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If you want to add some new ID, you have two ways:
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1) Write request for allocating IDs to 7-Zip developers.
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2) Generate 8-bytes ID:
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3F ZZ ZZ ZZ ZZ ZZ MM MM
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3F - Prefix for random IDs (1 byte)
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ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes.
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MM MM - Method ID (2 bytes)
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You can notify 7-Zip developers about your Developer ID / Method ID.
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Note: Use new ID, if old codec can not decode data encoded with new version.
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List of defined IDs
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-------------------
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00 - Copy
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03 - Delta
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04 - BCJ (x86)
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05 - PPC (big-endian)
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06 - IA64
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07 - ARM (little-endian)
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08 - ARMT (little-endian)
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09 - SPARC
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0A - ARM64
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0B - RISCV
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21 - LZMA2
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02.. - Common
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03 [Swap]
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- 2 Swap2
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- 4 Swap4
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03.. - 7z
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01 -
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01 - LZMA
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03 - [Branch Codecs]
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01 - [x86 Codecs]
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03 - BCJ
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1B - BCJ2 (4 packed streams)
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02 -
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05 - PPC (big-endian)
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03 -
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01 - Alpha
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04 -
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01 - IA64
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05 -
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01 - ARM (little-endian)
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06 -
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05 - M68 (big-endian)
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07 -
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01 - ARMT (little-endian)
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08 -
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05 - SPARC
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04 -
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01 - PPMD
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7F -
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01 - experimental method.
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04.. - Misc codecs
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00 - Reserved
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01 - [Zip]
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00 - Copy (not used. Use {00} instead)
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01 - Shrink
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06 - Implode
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08 - Deflate
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09 - Deflate64
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0A - Imploding
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0C - BZip2 (not used. Use {040202} instead)
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0E - LZMA (LZMA-zip)
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5D - ZSTD
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5F - xz
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60 - Jpeg
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61 - WavPack
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62 - PPMd (PPMd-zip)
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63 - wzAES
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02 -
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02 - BZip2
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03 - [Rar]
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01 - Rar1
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02 - Rar2
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03 - Rar3
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05 - Rar5
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04 - [Arj]
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01 - Arj(1,2,3)
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02 - Arj4
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05 - [Z]
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06 - [Lzh]
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07 - Reserved for 7z
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08 - [Cab]
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09 - [NSIS]
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01 - DeflateNSIS
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02 - BZip2NSIS
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F7 - External codecs (that are not included to 7-Zip)
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0x xx - reserved
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10 xx - reserved (LZHAM)
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01 - LZHAM
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11 xx - reserved (Tino Reichardt)
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01 - ZSTD
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02 - BROTLI
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04 - LZ4
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05 - LZ5
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06 - LIZARD
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12 xx - reserved (Denis Anisimov)
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01 - WavPack2
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FE - eSplitter
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FF - RawSplitter
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06.. - Crypto
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F0 - Ciphers without hashing algo
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01 - [AES]
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0x - AES-128
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4x - AES-192
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8x - AES-256
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Cx - AES
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x0 - ECB
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x1 - CBC
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x2 - CFB
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x3 - OFB
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x4 - CTR
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F1 - Combine Ciphers
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01 - [Zip]
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01 - ZipCrypto (Main Zip crypto algo)
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03 - [RAR]
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02 -
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03 - Rar29AES (AES-128 + modified SHA-1)
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07 - [7z]
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01 - 7zAES (AES-256 + SHA-256)
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---
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End of document
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