gzip 1.4(稳定版)

gzip是GNU zip的缩写，它是一个GNU自由软件的文件压缩程序，也经常用来表示gzip这种文件格式。
软件的作者是Jean-loup Gailly和Mark Adler。1992年10月31日第一次公开发布，版本号是0.1。
ChangeLog:
Bug fixes：
gzip -d could segfault and/or clobber the stack, possibly leading to
arbitrary code execution. This affects x86_64 but not 32-bit systems.
This fixes CVE-2010-0001.

gzip -d would fail with a CRC error for some valid inputs.
So far, the only valid input known to exhibit this failure was
compressed "from FAT filesystem (MS-DOS, OS/2, NT)". In addition,
to trigger the failure, your memcpy implementation must copy in
the "reverse" order.