[transform-swf-updates] BUG: Transform SWF 3.0 Beta: DefineMorphShapes with blocks of zeroes terminates movie decoding

[News on r. b. a. p. f. T. S. f. J. <tra...@li...>]

Some Flash files contain "corrupted" DefineMorphShape tags where a block 
of 33 zero bytes are included in the body of the tag. Transform tests 
explicitly for this and treats the tag as being empty allowing the 
remainder of the file to be decoded. The corrupted object is never used 
so movies can be decoded and re-encoded successfully.

However after successive refactorings the block of zero bytes is still 
detected but not skipped over. The result is that when the block of zero 
bytes is read it appears to be an "end of movie" marker and so decoding 
of the movie terminates prematurely but no error is reported.

Changing line 219-221 of DefineMorphShape.java from

        if (length - coder.bytesRead() != 33) {
            coder.check(length);
        }

to

        if (length - coder.bytesRead() == 33) {
            coder.skip(33);
        } else {
            coder.check(length);
        }

fixes this bug. A patch file is also included that performs this task. 
The repository has been updated.

Regards,

Stuart
--
Flagstone Software Ltd.