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@@ -11,8 +11,36 @@ multiprocessor machines, which makes it specially well suited for distribution of big software files and large scale data archiving. On files big enough, plzip can use hundreds of processors. +Plzip replaces every file given in the command line with a compressed +version of itself, with the name "original_name.lz". Each compressed +file has the same modification date, permissions, and, when possible, +ownership as the corresponding original, so that these properties can be +correctly restored at decompression time. Plzip is able to read from some +types of non regular files if the "--stdout" option is specified. -Copyright (C) 2009, 2010, 2011, 2012 Antonio Diaz Diaz. +If no file names are specified, plzip compresses (or decompresses) from +standard input to standard output. In this case, plzip will decline to +write compressed output to a terminal, as this would be entirely +incomprehensible and therefore pointless. + +Plzip will correctly decompress a file which is the concatenation of two +or more compressed files. The result is the concatenation of the +corresponding uncompressed files. Integrity testing of concatenated +compressed files is also supported. + +As a self-check for your protection, plzip stores in the member trailer +the 32-bit CRC of the original data and the size of the original data, +to make sure that the decompressed version of the data is identical to +the original. This guards against corruption of the compressed data, and +against undetected bugs in plzip (hopefully very unlikely). The chances +of data corruption going undetected are microscopic, less than one +chance in 4000 million for each member processed. Be aware, though, that +the check occurs upon decompression, so it can only tell you that +something is wrong. It can't help you recover the original uncompressed +data. + + +Copyright (C) 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz. This file is free documentation: you have unlimited permission to copy, distribute and modify it. |