You can get that if you don't read in the file as binary. Try:Check out the compress/decompress functions. They use zlib.For a project I am working on I need access to zlib decompression (Version 6 SWF files can be compressed using zlib and I need to decompress them to get their header information).
Hmmm, I tried that once but kept getting an error message that the string I provided wasn't a compressed string so assumed the functions used a different compression type. Must have been user error, I will give it another go.
decompress(url ("binfile:test.swf"))
Monte,
Thanks for the suggestion but the way a Version 6 SWF is created you can't decompress the file like that. The first 8 bytes are uncompressed data which contain the file signature ("FWS" or "CWS" if compressed), file version and file size (after decompression if compressed).
Here is what I have tried so far. I read the file as binary with start 9 to EOF. As I understand it this should start reading from the 9th byte until the end of file. Looking at the data that is being read it seems to be correct when compared with the data as viewed from within HexEditor. I then pass this data directly to decompress which says it is not a valid string.
I'm not really sure how to troubleshoot the problem at this point. As I don't know how to ensure that the data I am getting is in fact the full string and if decompress really should decompress it.
If anyone has any additional ideas I would appreciate it. I posted a SWF file at http://www.mangomultimedia.com/examples/test.swf which is a version 6 SWF with compression applied if anyone wants to fiddle with it.
Thanks,
Trevor
Here is what the Flash file format spec says. Note that they say the sig for compressed files is "FWC" which is wrong. It is "CWS".
--- SWF File Format Spec-------
The header begins with a three-byte Signature of either 0x46, 0x57, 0x53 (“FWS”) or 0x46, 0x57, 0x43 (“FWC”). An FWS signature indicates an uncompressed SWF file; FWC indicates that the entire file after the first 8 bytes (that is, after the FileLength field) has been compressed using the open standard ZLIB. The data format used by the ZLIB library is described by Request for Comments (RFCs) documents 1950 to 1952. FWC file compression is only permitted in SWF version 6 or greater.
A one-byte Version number follows the signature. The version number is not an ASCII character, but an 8-bit number. For example, for SWF 4 the version byte is 0x04, not the ASCII character ‘4’ (0x35). The FileLength field is the total length of the SWF file including the header. If this is an
uncompressed SWF (FWS signature), the FileLength field should exactly match the file size. If this is a compressed SWF (FWC signature), the FileLength field indicates the total length of the file after decompression, and thus will generally not match the file size. Having the uncompressed size available can make the decompression process more efficient.
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