7-Zip method IDs for 7z and xz archives | |
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Version: 18.06 | |
Date: 2018-06-30 | |
Each compression or crypto method in 7z is associated with unique binary value (ID). | |
The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). | |
xz and 7z formats use same ID map. | |
If you want to add some new ID, you have two ways: | |
1) Write request for allocating IDs to 7-Zip developers. | |
2) Generate 8-bytes ID: | |
3F ZZ ZZ ZZ ZZ ZZ MM MM | |
3F - Prefix for random IDs (1 byte) | |
ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes. | |
MM MM - Method ID (2 bytes) | |
You can notify 7-Zip developers about your Developer ID / Method ID. | |
Note: Use new ID, if old codec can not decode data encoded with new version. | |
List of defined IDs | |
------------------- | |
00 - Copy | |
03 - Delta | |
04 - BCJ (x86) | |
05 - PPC (big-endian) | |
06 - IA64 | |
07 - ARM (little-endian) | |
08 - ARMT (little-endian) | |
09 - SPARC | |
21 - LZMA2 | |
02.. - Common | |
03 [Swap] | |
- 2 Swap2 | |
- 4 Swap4 | |
03.. - 7z | |
01 - | |
01 - LZMA | |
03 - [Branch Codecs] | |
01 - [x86 Codecs] | |
03 - BCJ | |
1B - BCJ2 (4 packed streams) | |
02 - | |
05 - PPC (big-endian) | |
03 - | |
01 - Alpha | |
04 - | |
01 - IA64 | |
05 - | |
01 - ARM (little-endian) | |
06 - | |
05 - M68 (big-endian) | |
07 - | |
01 - ARMT (little-endian) | |
08 - | |
05 - SPARC | |
04 - | |
01 - PPMD | |
7F - | |
01 - experimental method. | |
04.. - Misc codecs | |
00 - Reserved | |
01 - [Zip] | |
00 - Copy (not used. Use {00} instead) | |
01 - Shrink | |
06 - Implode | |
08 - Deflate | |
09 - Deflate64 | |
0A - Imploding | |
0C - BZip2 (not used. Use {040202} instead) | |
0E - LZMA (LZMA-zip) | |
5F - xz | |
60 - Jpeg | |
61 - WavPack | |
62 - PPMd (PPMd-zip) | |
63 - wzAES | |
02 - | |
02 - BZip2 | |
03 - [Rar] | |
01 - Rar1 | |
02 - Rar2 | |
03 - Rar3 | |
05 - Rar5 | |
04 - [Arj] | |
01 - Arj(1,2,3) | |
02 - Arj4 | |
05 - [Z] | |
06 - [Lzh] | |
07 - Reserved for 7z | |
08 - [Cab] | |
09 - [NSIS] | |
01 - DeflateNSIS | |
02 - BZip2NSIS | |
F7 - External codecs (that are not included to 7-Zip) | |
0x xx - reserved | |
10 xx - reserved (LZHAM) | |
01 - LZHAM | |
11 xx - reserved (Tino Reichardt) | |
01 - ZSTD | |
02 - BROTLI | |
04 - LZ4 | |
05 - LZ5 | |
06 - LIZARD | |
12 xx - reserverd (Denis Anisimov) | |
01 - WavPack2 | |
FE - eSplitter | |
FF - RawSplitter | |
06.. - Crypto | |
F0 - Ciphers without hashing algo | |
01 - [AES] | |
0x - AES-128 | |
4x - AES-192 | |
8x - AES-256 | |
Cx - AES | |
x0 - ECB | |
x1 - CBC | |
x2 - CFB | |
x3 - OFB | |
x4 - CTR | |
F1 - Combine Ciphers | |
01 - [Zip] | |
01 - ZipCrypto (Main Zip crypto algo) | |
03 - [RAR] | |
02 - | |
03 - Rar29AES (AES-128 + modified SHA-1) | |
07 - [7z] | |
01 - 7zAES (AES-256 + SHA-256) | |
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End of document |