Thread Subject: unzip/gunzip into memory

Hi,

I would like to unzip/gunzip a file into memory instead of writing it to a file first and then
having to read it in again. Is this possible ?
I had a look at the gunzip command and it involves java, can I get to the unzipped data before it is written to file ?

Thanks !

"E " <ehelden@hotmail.com> wrote in message <ggodom$65o$1@fred.mathworks.com>...
> Hi,
>
> I would like to unzip/gunzip a file into memory instead of writing it to a file first and then
> having to read it in again. Is this possible ?
> I had a look at the gunzip command and it involves java, can I get to the unzipped data before it is written to file ?
>
> Thanks !

Hi

I don't think it is possible. What prevents you from reading the file from disk immediately after gunzipping it? Surely not the lack of disk space. If the time constraints are issue, try virtual drive. This is not matlab topic.

E wrote:

> I would like to unzip/gunzip a file into memory instead of writing it to a file first and then
> having to read it in again. Is this possible ?

Yes, you could write a mex interface to zlib.

Alternately, you could mmap the output file. It will still be written to disk, but it
would also be available in memory.

--
.signature note: I am now avoiding replying to unclear or ambiguous postings.
Please review questions before posting them. Be specific. Use examples of what you mean,
of what you don't mean. Specify boundary conditions, and data classes and value
relationships -- what if we scrambled your data or used -Inf, NaN, or complex(rand,rand)?

On 28 Nov 2008, 15:29, Walter Roberson <rober...@hushmail.com> wrote:
> E wrote:
> > I would like to unzip/gunzip a file into memory instead of writing it to a file first and then
> > having to read it in again. Is this possible ?
>
> Yes, you could write a mex interface tozlib.

Somewhat related - does anyone know of a Matlab native implementation
of zlib?
(say analogous to csharp native implementation
http://www.icsharpcode.net/OpenSource/SharpZipLib/ etc)

I expect unlikely but thought I'd better ask.

Thanks in advance,
Ljubomir