Posted by Jochem Maas on 10/26/05 22:15

Graham Anderson wrote:
> Just to show I am not a total leech, I did consult the manual before I
> posted the question :)

ack.

>
> The compressor in the file data says: dcomzlib
>
> I tried the below with gzinflate and with gzuncompress.
> Both give errors:
> gzinflate(): data error
> gzuncompress(): data error
>
> The below is the copy/pasted hex of the compressed movie header in the
> Quicktime Movie File
> FYI ,I did not compress the string myself...it is compressed
> automatically when a Quicktime movie is exported.
>
> $compressed =
> "DE789CB552BF6F133114F65D2852A50A7568E14041B2A00B120CB081549514860CA9545
> 15431743167E7CE8AED3B9D9D2B65E9D4FF0484F8079810EC8C0C8CFC2BE1D9E7FB91A4A
> 008C44B7CF67B7EFEDE67BF0FA1B59F32CB4A849090654A61465F2FD21B762014BE72234
> 0F6DFDA9CB3EC3F6D56F6FC92F520FEC1146402EB133371357B6DCD1AAD3D3B9BAD5E37B
> 09F07CEDD61D46898FB4C68D39EF0B8EE6CB8262927B0C092FEE6EE080D613C4EA928ECB
> E4C4561D81B43F2FC914309822FD120CF05C32F218C0F1800E2215154303810BC935C8D2
> 171944857204A2050B19D39F3C4EE5BD0151FB62143810C115C0319B15991F9EEC90C042
> 71A3F27A64306EDD08A4C9F166CDC29B16141FCFA9336AF05CC2FB4D1B493B3EF082ED09
> ABB42659BB6BF16B372AF264CB1D23E318AB471FDA811EA5EF4A1523C1F6FC616ECBDF57
> B7B6D2CCEDAFCF007CCBB7146D9C2E3DDD38CA80E96B5ED098862F1616F4DA9B10CAF292
> 299EBE2C36A234CFE20D3D0E734323DFF3B99462223B4835567AF20DFE0FD8AF27DD2956
> FC929F38A0188E0F3CD4A31C710CE96F4FBCCEB77ABACF41B7474FB5F75F8CDEB70BCA0C
> 3E302501B1F7EB668E55E818780B60CFDA55DC6FA4071490CCF14BADCB0BBCABF6AF336B
> A549BBD6D98EF78795DB7F21A1D1DE27D124F92229BAAFA5E273EE3EE477D5A2068DE01A
> 10C9F7293E2112FD9912109C38785058E72314D64567266D17653809256F81BB139CB55A
> 6EC7A3D17E4CC01FF027425F9B1";
>
> $string = pack("H*", $compressed);

ok I don't understand pack() very well at all, but why are you using it
here? as far as I can tell gzinflate()/gzuncompress() don't work on binary
strings. what happens is you don't use pack()?

> $uncompressed = gzinflate($string);
> //$uncompressed = gzuncompress($string);
> echo $uncompressed;
>
> ?>
>
>
> On Oct 26, 2005, at 10:20 AM, Jochem Maas wrote:
>
>> Graham Anderson wrote:
>>
>>> How do you decompress a zlib'd string located in a file with php ?
>>> I need to dynamically write a password string into a movie file.....
>>> It appears that in QuickTime movie API, all sprite variables/ values
>>> are zlib'd inside the movie file
>>> So I need to:
>>> find the string
>>> decompress a zlib'd string inside a file.
>>> change its value => password=new_password
>>> recompress the new value
>>> write the zlib'd string back to the file
>>> I'm sure if I can decompress the string, then it will not be too
>>> hard to do the rest :)
>>>
>>
>> I'm sure if you spent 5 seconds searching the manual you would find
>> this page:
>> http://php.net/manual/en/function.gzuncompress.php
>>
>> and this one:
>>
>> http://php.net/manual/en/function.gzcompress.php
>>
>> (HINT: I typed http://php.net/zlib into the address bar to find them)
>>
>>
>> 'the rest' involves find your substring's beginning and ending offset
>> and then
>> using those values to 'splice' the new substring (aka password) into
>> the file/stream,
>> I can visualize how ot do it but have never actually needed to do
>> something like
>> that ... I would say the compress/decompress is the easier part
>> personally ...
>> buy hey as long as you get it working :-)
>>
>>
>>
>>> many thanks
>>>
>>
>> back at ya, I learnt some stuff answering (hopefully) you question ;-)
>>
>>
>>> g
>>
>>
>

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