GZIPInputStream and number of read bytes

Question

Hi all,
I have a GZIPInputStream wrapped up in BufferedReader and would like to determine either the number of bytes read or the number of bytes left to read.
GZIPInputStream provides the available() function for determining the number of bytes left to read. However, this returns always one (http://java.sun.com/j2se/1.5.0/docs/api/java/io/FilterInputStream.html#available()).
The available() function of the FileInputStream returns always the length of the file in bytes.
Does anybody have an idea how to do this?
Thanks,
Andreas

Answer 1

I have a GZIPInputStream wrapped up inBufferedReader
and would like to determine either the number of
bytes read or the number of bytes left to read.
GZIPInputStream provides the available() functionfor
determining the number of bytes left to read.No! It provides the number of bytes that can be read
without blocking which may be much less that the
number of bytes left to read and can be zero with
bytes still to be read.That's true. I was aware of this, but not clear enough.
However, this returns always one
(http://java.sun.com/j2se/1.5.0/docs/api/java/io/Filte
rInputStream.html#available()).
The available() function of the FileInputStream
returns always the length of the file in bytes.No! It provides the number of bytes that can be read
without blocking. It cannot return the length of the
file since a file length can be greater than the
maximum integer.Again, that's true, but in my case it always returns the same number.
If I read a simple text file it works perfectly.
I want a way to determine approximately where in the file I am. Is there some way to do this for zipped files?