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Diffstat (limited to 'README')
| -rw-r--r-- | README | 29 |
1 files changed, 15 insertions, 14 deletions
@@ -5,20 +5,6 @@ small size makes it well suited for embedded devices or software installers that need to decompress files but do not need compression capabilities. Lunzip is fully compatible with lzip-1.4 or newer. -If the size of the output buffer is specified with the "--buffer-size" -option, lunzip uses the decompressed file as dictionary for distances -beyond the buffer size and is able to decompress any file using as -little memory as 50 kB, irrespective of the dictionary size used to -compress the file. Of course, the smaller the output buffer size used in -relation to the dictionary size, the more accesses to disk are needed -and the slower the decompression is. This "low memory" mode only works -when decompressing to a regular file and is intended for systems without -enough memory (RAM + swap) to keep the whole dictionary at once. - -The amount of memory required by lunzip to decompress a file is about -46 kB larger than the dictionary size used to compress that file, unless -the "--buffer-size" option is specified. - The lzip file format is designed for long-term data archiving. It is clean, provides very safe 4 factor integrity checking, and is backed by the recovery capabilities of lziprecover. @@ -28,6 +14,21 @@ bzip2, which makes it safer than decompressors returning ambiguous warning values (like gunzip) when it is used as a back end for tar or zutils. +Lunzip provides a "low memory" mode able to decompress any file using as +little memory as 50 kB, irrespective of the dictionary size used to +compress the file. To activate it, specify the size of the output buffer +with the "--buffer-size" option and lunzip will use the decompressed +file as dictionary for distances beyond the buffer size. Of course, the +smaller the output buffer size used in relation to the dictionary size, +the more accesses to disk are needed and the slower the decompression +is. This "low memory" mode only works when decompressing to a regular +file and is intended for systems without enough memory (RAM + swap) to +keep the whole dictionary at once. + +The amount of memory required by lunzip to decompress a file is about +46 kB larger than the dictionary size used to compress that file, unless +the "--buffer-size" option is specified. + Lunzip attempts to guess the name for the decompressed file from that of the compressed file as follows: |