This isn't a bug. The zlib module decompressed the raw gzipped buffer and
stopped. It isn't the job of zlib to try to infer any structure on the
buffer you gave it, or to attempt to look for more work to do after
finishing what it was asked to do. Subsequent data in the buffer could be
anything, after all, not just gzipped data. In contrast, the gunzip command
is being told "this is a gzipped file (and nothing else)", so it's
reasonable for it to continue after processing one compressed buffer to see
if it can do more.
Note that, in your case, you can gunzip the second chunk by slicing it from
the original buffer. But remember that only you know the structure of the
file you are reading; there is no structure embedded within the file for
some piece of code to interpret.
--
Martin Cooper
On Fri, Aug 9, 2013 at 11:45 PM, ribao wei <riba...@gmail.com> wrote:
> Hi,
>
> I just encounter this and not sure whether it is a bug in zlib module.
>
> echo "1" > 1.txt
> echo "2" > 2.txt
> gzip 1.txt
> gzip 2.txt
> cat 1.txt.gz 2.txt.gz > 3.txt.gz
>
> Now,
>
> gunzip 3.txt.gz
>
> prints:
> 1
> 2
>
>
> However,
>
> zlib.gunzip(fs.writeReadSync("**c.gz"), function (err, buffer) {
>
> console.log(buffer.toString())**;
>
> });
>
> prints:
>
> 1
>
> (empty line)
>
>
> Am I missing something?
>
>
> Thanks,
>
> Wei
>
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