Decompressing A SWF With Java
Posted by Brooks in Flash, Java on Aug 10th, 2006 | 8 commentsThis example reads a swf file into a byte array and decompresses / inflates all of the bytes of the swf except for the the first 8 bytes which are always uncompressed. As most swf files have zlib compression applied, file decompression is necessary if you wish to fully parse the swf. As with the previous post on swf compression, this is a very raw example–no file signature or compression checking is performed before attempting to inflate the file.
8 Responses to “ “Decompressing A SWF With Java”
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look dude, this makes no sense at all.
Heh, heh–you should read the file format specification….you know you’re in trouble when it starts to make sense to you.
What type of compression is used for an SWF file? Gzip? zip? bzip? tar?
Hey Mark,
The swf file format uses zlib compression.
Yep…
Yes, I’ve heard of “decaf.” What’s your point?
…
hey there, first comment after 2 year!!!
thank you for the code
I’m using it in my own project and I’ve found a bug related to inflater: sometimes finished() is read as false when in fact should be true… workaround is use also count!=0 in while loop.
cheers
hi, it’s me again ;) , the project I was talking about in the last post had become a quite structured one… it is called JavaSWF9 , if you or someone in the audience interested in contributing drop a message at http://www.stefanocottafavi.com
cheers
This can be done with a Perl one-liner instead of 115 lines of Java ;-),
perl -MCompress::Zlib -0777 -e \
‘print uncompress substr , 8;’ flash.swf > flash