Bug #17272 Updated: Failure to read Flash MX file size

ID: 17272 Updated by: derick@php.net Reported By: zzz123123123@hotmail.com -Status: Assigned +Status: Closed Bug Type: Feature/Change Request Operating System: N/A PHP Version: 4.1.2 Assigned To: derick New Comment: Added code to handle compressed SWF files to CVS, please try the latest snapshot (in a couple of hours from now) from http://snaps.php.net/ Derick Previous Comments: ------------------------------------------------------------------------ [2002-05-23 08:43:59] derick@php.net This is enough info.. I'll see if I can hack it in. Derick ------------------------------------------------------------------------ [2002-05-23 08:40:40] niels@creatype.nl I ran into the same problem when Flash 6 came out, so I tried to fix the problem with PHP code. The SWC format is a regular SWF file, but with a portion of the file compressed with zlib. Unfortunately the width and height of the SWC file is located inside the compressed portion. SWF: [HEADER - 3 bytes] 'FWS' [VERSION - 1 byte] In which version was this file created [SIZE - 4 bytes] size of file [TAGS] All tags SWC: [HEADER - 3 bytes] 'CWS' [VERSION - 1 byte] In which version was this file created [SIZE - 4 bytes] size of uncompressed file [ZLIBSTREAM] Zlib compressed stream of all tags To decompress the file you need to copy the first 8 bytes of the SWC file to a buffer and change to first byte of the buffer to 'C'. Then you need to decompress the remaining bytes of the SWC file and append it to the buffer. The following PHP function uses this method to decompress the file: function phpAds_SWFDecompress($buffer) { if (function_exists('gzuncompress') && substr($buffer, 0, 3) == swf_tag_compressed && ord(substr($buffer, 3, 1)) >= 6) { $output = 'F'; $output .= substr ($buffer, 1, 7); $output .= gzuncompress (substr ($buffer, 8)); return ($output); } else return ($buffer); } If you are only interested in retrieving the dimensions of the SWC file it can be even easier. Just strip the first 8 bytes of the SWC file and decompress the remaining bytes. The tags for the width and height should be first two tags inside the decompressed stream. ------------------------------------------------------------------------ [2002-05-17 13:27:46] derick@php.net I'm suspending this until somebody can show me some documentation on the new fileformat. Apperently there are two Flash 6 formats, the SWF one (which works fine and is the same as Flash 5) and the SWC one, which is some compressed format. Derick ------------------------------------------------------------------------ [2002-05-16 13:22:22] derick@php.net Not really a bug, as it was not written for this :) Anyway, if you could mail me empty flash movies with the following size, I'll see what I can do: 255x127 640x480 400x256 (and perhaps some more) Derick ------------------------------------------------------------------------ [2002-05-16 12:22:48] reywob@f2s.com The problem is with the getimagesize() function and its detection routines which don't detect Flash 6/MX content. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/17272 -- Edit this bug report at http://bugs.php.net/?id=17272&edit=1