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Diffstat (limited to 'DOC/Methods.txt')
| -rwxr-xr-x | DOC/Methods.txt | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/DOC/Methods.txt b/DOC/Methods.txt index 34e1a5a9..393e1b0c 100755 --- a/DOC/Methods.txt +++ b/DOC/Methods.txt @@ -1,9 +1,26 @@ -Compression method IDs (4.27) +Compression method IDs (4.38) ----------------------------- Each compression method in 7z has unique binary value (ID). The length of ID in bytes is arbitrary but it can not exceed 15 bytes. +If you want to add some new ID, you have two ways: +1) Write request for allocating IDs to 7-zip developers. +2) Use such random ID: + 03 E0 ZZ ... ZZ MM ... MM VV ... VV + + ZZ != 0, MM != 0, VV != 0 + + 03 E0 - Prefix for random IDs + ZZ ... ZZ - Developer ID. (length >= 4). Use real random bytes. + You can notify 7-Zip developers about your Developer ID. + MM ... MM - Method ID (length >= 1) + VV ... VV - Version (length >= 1) + + Note: Use new ID (MM ... MM VV .. VV) only if old codec can not decode + data encoded with new version. + + List of defined IDs ------------------- @@ -41,6 +58,10 @@ List of defined IDs 04 - PPMD 01 - Version + 80 - reserved for independent developers + + E0 - Random IDs + 04 - Misc 00 - Reserved 01 - Zip @@ -63,6 +84,9 @@ List of defined IDs 06 - Lzh 07 - Reserved for 7z 08 - Cab + 09 - NSIS + 01 - DeflateNSIS + 02 - BZip2NSIS 06 - Crypto |