https://github.com/CGATOxford/cgat/blob/master/CGAT/dictzip.py
http://code.google.com/p/pytoolkits/source/browse/trunk/utils/stardict/dictzip.py
http://code.google.com/p/idzip/source/browse/idzip/decompressor.py
另外有两个库提供了很吊的gzip和bz2 random access
http://svn.ghostscript.com/ghostscript/tags/zlib-1.2.3/examples/zran.c