17-Zip method IDs for 7z and xz archives 2--------------------------------------- 3 4Version: 18.06 5Date: 2018-06-30 6 7Each compression or crypto method in 7z is associated with unique binary value (ID). 8The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). 9 10xz and 7z formats use same ID map. 11 12If you want to add some new ID, you have two ways: 13 1) Write request for allocating IDs to 7-Zip developers. 14 2) Generate 8-bytes ID: 15 16 3F ZZ ZZ ZZ ZZ ZZ MM MM 17 18 3F - Prefix for random IDs (1 byte) 19 ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes. 20 21 MM MM - Method ID (2 bytes) 22 23 You can notify 7-Zip developers about your Developer ID / Method ID. 24 25 Note: Use new ID, if old codec can not decode data encoded with new version. 26 27 28List of defined IDs 29------------------- 30 3100 - Copy 32 3303 - Delta 3404 - BCJ (x86) 3505 - PPC (big-endian) 3606 - IA64 3707 - ARM (little-endian) 3808 - ARMT (little-endian) 3909 - SPARC 40 4121 - LZMA2 42 4302.. - Common 44 03 [Swap] 45 - 2 Swap2 46 - 4 Swap4 47 4803.. - 7z 49 01 - 50 01 - LZMA 51 52 03 - [Branch Codecs] 53 01 - [x86 Codecs] 54 03 - BCJ 55 1B - BCJ2 (4 packed streams) 56 02 - 57 05 - PPC (big-endian) 58 03 - 59 01 - Alpha 60 04 - 61 01 - IA64 62 05 - 63 01 - ARM (little-endian) 64 06 - 65 05 - M68 (big-endian) 66 07 - 67 01 - ARMT (little-endian) 68 08 - 69 05 - SPARC 70 71 04 - 72 01 - PPMD 73 74 7F - 75 01 - experimental method. 76 77 7804.. - Misc codecs 79 80 00 - Reserved 81 82 01 - [Zip] 83 00 - Copy (not used. Use {00} instead) 84 01 - Shrink 85 06 - Implode 86 08 - Deflate 87 09 - Deflate64 88 0A - Imploding 89 0C - BZip2 (not used. Use {040202} instead) 90 0E - LZMA (LZMA-zip) 91 5F - xz 92 60 - Jpeg 93 61 - WavPack 94 62 - PPMd (PPMd-zip) 95 63 - wzAES 96 97 02 - 98 02 - BZip2 99 100 03 - [Rar] 101 01 - Rar1 102 02 - Rar2 103 03 - Rar3 104 05 - Rar5 105 106 04 - [Arj] 107 01 - Arj(1,2,3) 108 02 - Arj4 109 110 05 - [Z] 111 112 06 - [Lzh] 113 114 07 - Reserved for 7z 115 116 08 - [Cab] 117 118 09 - [NSIS] 119 01 - DeflateNSIS 120 02 - BZip2NSIS 121 122 F7 - External codecs (that are not included to 7-Zip) 123 124 0x xx - reserved 125 126 10 xx - reserved (LZHAM) 127 01 - LZHAM 128 129 11 xx - reserved (Tino Reichardt) 130 01 - ZSTD 131 02 - BROTLI 132 04 - LZ4 133 05 - LZ5 134 06 - LIZARD 135 136 12 xx - reserverd (Denis Anisimov) 137 138 01 - WavPack2 139 FE - eSplitter 140 FF - RawSplitter 141 142 14306.. - Crypto 144 145 F0 - Ciphers without hashing algo 146 147 01 - [AES] 148 0x - AES-128 149 4x - AES-192 150 8x - AES-256 151 Cx - AES 152 153 x0 - ECB 154 x1 - CBC 155 x2 - CFB 156 x3 - OFB 157 x4 - CTR 158 159 F1 - Combine Ciphers 160 161 01 - [Zip] 162 01 - ZipCrypto (Main Zip crypto algo) 163 164 03 - [RAR] 165 02 - 166 03 - Rar29AES (AES-128 + modified SHA-1) 167 168 07 - [7z] 169 01 - 7zAES (AES-256 + SHA-256) 170 171 172--- 173End of document 174