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采用 LZ77 运算规则 压缩及解压工具

Current Version: 1.0.3
See the file ChangeLog for the details of all changes.

User visible changes from 1.0.2 to 1.0.3

o Added -K option for znew to keep old .Z files if smaller

o Added -q option (quiet) to cancel -v in GZIP env variable.

o Made gzexe safer on systems with filename limitation to 14 chars.

o Fixed bugs in handling of GZIP env variable and incorrect free with Turbo C.


User visible changes from 1.0.1 to 1.0.2

o Added env variable GZIP for default options. Example:
   for sh:   GZIP="-8 -v"; export GZIP
   for csh:  setenv GZIP "-8 -v"

o Added support for the Amiga.

O znew now keeps the old .Z if it is smaller than the .z file.
  This can happen for some large and very redundant files.

o Do not complain about trailing garbage for record oriented IO (Vax/VMS).
  This implies however that multi-part gzip files are not supported
  on such systems.

o Added gzexe to compress rarely used executables.

o Reduce memory usage (required for MSDOS and useful on all systems).

o Preserve time stamp in znew -P (pipe option) if touch -r works.


User visible changes from 1.0 to 1.0.1

o fix trivial errors in the Borland makefile (msdos/Makefile.bor)


User visible changes from 0.8.2 to 1.0

o gzip now runs on Vax/VMS

o gzip will not not overwrite files without -f when using /bin/sh in
  background.

o Support the test option -t for compressed (.Z) files.
  Allow some data recovery for bad .Z files.

o Added makefiles for MSDOS (Only tested for MSC, not Borland).

o still more changes to configure for several systems


User visible changes from 0.8.1 to 0.8.2:

o yet more changes to configure for Linux and other systems

o Allow zcat on a file with multiple links.


User visible changes from 0.8 to 0.8.1:

o znew has now a pipe option -P to reduce the disk space requirements,
  but this option does not preserve timestamps.

o Fixed some #if directives for compilation with TurboC.


User visible changes from 0.7 to 0.8:

o gzip can now extract .z files created by 'pack'.

o configure should no longer believe that every machine is a 386

o Fix the entry for /etc/magic in INSTALL.

o Add patch for GNU tar 1.11.1 and a pointer to crypt++.el

o Uncompress files with multiple links only with -f.

o Fix for uncompress of .Z files on 16-bit machines

o Create a correct output name for file names of exactly N-1 chars when
  the system has a limit of N chars.


User visible changes from 0.6 to 0.7:

o Use "make check" instead of "make test".

o Keep time stamp and pass options to gzip in znew.

o Do not create .z.z files with gzip -r.

o Allow again gunzip .zip files (was working in 0.5)

o Allow again compilation with TurboC 2.0 (was working in 0.4)


User visible changes form 0.5 to 0.6:

o gunzip reported an error when extracting certain .z files. The .z files
  produced by gzip 0.5 are correct and can be read by gunzip 0.6.

o gunzip now supports multiple compressed members within a single .z file.

o Fix the check for i386 in configure.

o Added "make test" to check for compiler bugs. (gcc -finline-functions
  is broken at least on the NeXT.)

o Use environment variable PAGER in zmore if it is defined.

o Accept gzcat in addition to zcat for people having /usr/bin before
  /usr/local/bin in their path.