LMMS

Hi,

Am Freitag, 4. Juni 2010, um 14:54:09 schrieb Andy Kelley:
> My failed attempts:
> 
> $ gunzip 1-blank.mmpz
> gzip: 1-blank.mmpz: unknown suffix -- ignored
> 
> $ zcat 1-blank.mmpz
lmms -d blank.mmpz > blank.mmp


> It looks like the file is compressed with qCompress() and qDecompress()
> with the default compression setting, which means that the above should
> work!
Almost.. 4 bytes of data length are prepended:

http://doc.trolltech.com/4.6/qbytearray.html#qUncompress

Toby

"If you want to use this function to* uncompress external data compressed
using zlib*, you first need to prepend four bytes to the byte array that
contain the expected length"

I want to do the opposite - uncompress data compressed using qCompress().

I don't want to have to have lmms installed to do it

On Fri, Jun 4, 2010 at 6:04 AM, Tobias Doerffel
<tobias.doerffel@...:

> Hi,
>
> Am Freitag, 4. Juni 2010, um 14:54:09 schrieb Andy Kelley:
> > My failed attempts:
> >
> > $ gunzip 1-blank.mmpz
> > gzip: 1-blank.mmpz: unknown suffix -- ignored
> >
> > $ zcat 1-blank.mmpz
> lmms -d blank.mmpz > blank.mmp
>
>
> > It looks like the file is compressed with qCompress() and qDecompress()
> > with the default compression setting, which means that the above should
> > work!
> Almost.. 4 bytes of data length are prepended:
>
> http://doc.trolltech.com/4.6/qbytearray.html#qUncompress
>
> Toby
>
>
> ------------------------------------------------------------------------------
> ThinkGeek and WIRED's GeekDad team up for the Ultimate
> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the
> lucky parental unit.  See the prize list and enter to win:
> http://p.sf.net/sfu/thinkgeek-promo
> _______________________________________________
> LMMS-devel mailing list
> LMMS-devel@...
> https://lists.sourceforge.net/lists/listinfo/lmms-devel
>
>


-- 
Andy Kelley
http://superjoesoftware.com/

On 4 June 2010 09:08, Andrew R Kelley <andrew.r.kelley@...> wrote:
> "If you want to use this function to uncompress external data compressed
> using zlib, you first need to prepend four bytes to the byte array that
> contain the expected length"
>
> I want to do the opposite - uncompress data compressed using qCompress().
>
> I don't want to have to have lmms installed to do it

(On Linux) : Strip off the first four bytes first :

$ tail --bytes=+4 | uncompress -c - > outputfilename.uncompressed

(or something along those lines).

This works:

lmms -d inputfile.mmpz > output.mmp

http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ

<http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ>
-Octosquidopus
<http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ>

On Fri, Jun 4, 2010 at 08:54, Andy Kelley <superjoe30@...> wrote:

> My failed attempts:
>
> $ gunzip 1-blank.mmpz
> gzip: 1-blank.mmpz: unknown suffix -- ignored
>
> $ zcat 1-blank.mmpz
>
> gzip: 1-blank.mmpz: not in gzip format
>
> $ python
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
> [GCC 4.4.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import zlib
> >>> zlib.decompress(open('1-blank.mmpz', 'rb').read())
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> zlib.error: Error -3 while decompressing data: unknown compression method
>
>
> It looks like the file is compressed with qCompress() and qDecompress()
> with the default compression setting, which means that the above should
> work!
>
>
> --
> Andy Kelley
> http://superjoesoftware.com/
>
>
> ------------------------------------------------------------------------------
> ThinkGeek and WIRED's GeekDad team up for the Ultimate
> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the
> lucky parental unit.  See the prize list and enter to win:
> http://p.sf.net/sfu/thinkgeek-promo
> _______________________________________________
> LMMS-devel mailing list
> LMMS-devel@...
> https://lists.sourceforge.net/lists/listinfo/lmms-devel
>
>

yeah but then my project is dependent on LMMS, Qt, and a dozen other libs.

On Fri, Jun 4, 2010 at 6:19 AM, Kevin <octosquidopus@...> wrote:

> This works:
>
> lmms -d inputfile.mmpz > output.mmp
>
> http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ
>
> <http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ>
> -Octosquidopus
> <http://lmms.sourceforge.net/wiki/index.php?title=Developer_FAQ>
>
> On Fri, Jun 4, 2010 at 08:54, Andy Kelley <superjoe30@...> wrote:
>
>> My failed attempts:
>>
>> $ gunzip 1-blank.mmpz
>> gzip: 1-blank.mmpz: unknown suffix -- ignored
>>
>> $ zcat 1-blank.mmpz
>>
>> gzip: 1-blank.mmpz: not in gzip format
>>
>> $ python
>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
>> [GCC 4.4.3] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import zlib
>> >>> zlib.decompress(open('1-blank.mmpz', 'rb').read())
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> zlib.error: Error -3 while decompressing data: unknown compression method
>>
>>
>> It looks like the file is compressed with qCompress() and qDecompress()
>> with the default compression setting, which means that the above should
>> work!
>>
>>
>> --
>> Andy Kelley
>> http://superjoesoftware.com/
>>
>>
>> ------------------------------------------------------------------------------
>> ThinkGeek and WIRED's GeekDad team up for the Ultimate
>> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the
>> lucky parental unit.  See the prize list and enter to win:
>> http://p.sf.net/sfu/thinkgeek-promo
>> _______________________________________________
>> LMMS-devel mailing list
>> LMMS-devel@...
>> https://lists.sourceforge.net/lists/listinfo/lmms-devel
>>
>>
>


-- 
Andy Kelley
http://superjoesoftware.com/

Hi,

Am Freitag, 4. Juni 2010, um 14:54:09 schrieb Andy Kelley:
> >>> import zlib
> >>> zlib.decompress(open('1-blank.mmpz', 'rb').read())
(bash) tail -c+5 foo.mmpz > foo
(python) zlib.decompress(open('foo', 'rb').read())

works for me :)

Toby

Hey me too!

Thanks Toby.

On Fri, Jun 4, 2010 at 6:22 AM, Tobias Doerffel
<tobias.doerffel@...:

> Hi,
>
> Am Freitag, 4. Juni 2010, um 14:54:09 schrieb Andy Kelley:
> > >>> import zlib
> > >>> zlib.decompress(open('1-blank.mmpz', 'rb').read())
> (bash) tail -c+5 foo.mmpz > foo
> (python) zlib.decompress(open('foo', 'rb').read())
>
> works for me :)
>
> Toby
>
>
> ------------------------------------------------------------------------------
> ThinkGeek and WIRED's GeekDad team up for the Ultimate
> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the
> lucky parental unit.  See the prize list and enter to win:
> http://p.sf.net/sfu/thinkgeek-promo
> _______________________________________________
> LMMS-devel mailing list
> LMMS-devel@...
> https://lists.sourceforge.net/lists/listinfo/lmms-devel
>
>


-- 
Andy Kelley
http://superjoesoftware.com/