7-Zip method IDs (9.24) | |
----------------------- | |
Each compression or crypto method in 7z has unique binary value (ID). | |
The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). | |
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 only if old codec can not decode data encoded with new version. | |
List of defined IDs | |
------------------- | |
00 - Copy | |
03 - Delta | |
04 - x86 (BCJ) | |
05 - PPC (Big Endian) | |
06 - IA64 | |
07 - ARM (little endian) | |
08 - ARM Thumb (little endian) | |
09 - SPARC | |
21 - LZMA2 | |
02.. - Common | |
03 Swap | |
- 2 Swap2 | |
- 4 Swap4 | |
03.. - 7z | |
01 - LZMA | |
01 - Version | |
03 - Branch | |
01 - x86 | |
03 - BCJ | |
1B - BCJ2 | |
02 - PPC | |
05 - PPC (Big Endian) | |
03 - Alpha | |
01 - Alpha | |
04 - IA64 | |
01 - IA64 | |
05 - ARM | |
01 - ARM | |
06 - M68 | |
05 - M68 (Big Endian) | |
07 - ARM Thumb | |
01 - ARMT | |
08 - SPARC | |
05 - SPARC | |
04 - PPMD | |
01 - Version | |
7F - | |
01 - experimental methods. | |
04.. - Misc | |
00 - Reserved | |
01 - Zip | |
00 - Copy (not used). Use {00} instead | |
01 - Shrink | |
06 - Implode | |
08 - Deflate | |
09 - Deflate64 | |
10 - Imploding | |
12 - BZip2 (not used). Use {04 02 02} instead | |
14 - LZMA | |
60 - Jpeg | |
61 - WavPack | |
62 - PPMd | |
63 - wzAES | |
02 - BZip | |
02 - BZip2 | |
03 - Rar | |
01 - Rar15 | |
02 - Rar20 | |
03 - Rar29 | |
04 - Arj | |
01 - Arj (1,2,3) | |
02 - Arj 4 | |
05 - Z | |
06 - Lzh | |
07 - Reserved for 7z | |
08 - Cab | |
09 - NSIS | |
01 - DeflateNSIS | |
02 - BZip2NSIS | |
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 - Main Zip crypto algo | |
03 - RAR | |
02 - | |
03 - Rar29 AES-128 + (modified SHA-1) | |
07 - 7z | |
01 - AES-256 + SHA-256 | |
--- | |
End of document |