| Torrentzip is a program that brings zip archives into a ``normal |
| form'': if the contained files (and their names) are identical, the |
| zip archive will always be the same, byte-wise. Below is the |
| definition fo the Torrentzip normal form. |
| |
| * order of files in archive |
| |
| In ascending order, as determined by strcasecmp(3). |
| |
| XXX: How does it deal with file names differing in case only? |
| |
| |
| * compression used |
| |
| Deflate at best compression level: |
| |
| deflateInit2(..., Z_BEST_COMPRESSION, Z_DEFLATED, |
| -MAX_WBITS, 8, Z_DEFAULT_STRATEGY); |
| |
| * fields in local/central directory |
| |
| version made by 0 |
| version needed to extract 20 |
| general purpose flag 2 (maximum compression) |
| compression method 8 (Deflated) |
| last mod file time 0xbc00 (23:32 GMT+1) |
| last mod file date 0x2198 (1996/12/24) |
| extra fields none |
| file comment none |
| disk number start 0 |
| internal file attributes 0 |
| external file attributes 0 |
| |
| * archive comment: |
| |
| The archive comment contains a signature and a crc32 checksum of the |
| central directory (as specified by size/offset in EOCD record). This |
| is used to detect wether a torrentziped archive was modified by a |
| non-torrentzip aware program. |
| |
| TORRENTZIPPED-XXXXXXXX where XXXXXXX is the crc32 checksum of |
| central dir in hex, using uppercase letters A-F. |
