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- 7-Zip method IDs for 7z and xz archives
- ---------------------------------------
- Version: 15.06
- Date: 2015-06-23
- 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
- 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
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