Source code
Revision control
Copy as Markdown
Other Tools
7-Zip method IDs for 7z and xz archives↩
---------------------------------------↩
↩
Version: 17.01↩
Date: 2017-05-27↩
↩
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↩
↩
↩
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)↩
↩
↩
---↩
End of document↩