http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=580
------- Comment #13 from guy@xxxxxxxxxxxx 2007-10-03 00:46 GMT -------
sgzip's sgzlib.c says
sgzip files are files based on the gzip compression
library which are also quickly seekable and therefore may be used
for applications where seeking is important.
and sgzlib.h says
The sgzip file format basically relies on breaking the file into
blocks, each of these blocks is compressed seperately (which
results in a slight decrease of compression for small blocks). The
file then stores these blocks in the compressed file. Just before
each compressed block, an offset is stored to the next block in the
file.
I.e., it is *NOT* a library that provides random access to gzipped files, it's
a library that defines its own file format, designed to better support random
access than gzip format does. That might be useful - although bzip2 format
*also* should support random access, and is, I suspect, more commonly used -
but it doesn't provide a way to do efficient random access to .gz files.
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