StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<p>Think <a href="http://download.oracle.com/otndocs/jcp/network_transfer_format-1.0-fr-spec-oth-JSpec/" rel="noreferrer">that's</a> what you're looking for. </p> <blockquote> <p>...However, for any given Pack200 archive, every decompressor is required to produce a particular byte-wise image for each class file transmitted. This requirement is placed on decompressors in order to make it possible for compressors to transmit information, such as message digests, which relates to the eventual byte-wise contents of transmitted class files. This section describes the restrictions placed on every decompressor that makes the byte-wise contents of its output files a well-defined function of its input.</p> </blockquote> <p>This means you can do what you want to do here. JNF/Pack200 works by taking out constants that are shared across classes and intelligently compressing the .class files - but this portion of the standard says that while it COULD be possible to reconstruct class files several ways, this would lead to not being able to verify these files with digests. To avoid that issue, Pack200 explicitly specifies how decoding should work - so while the output .class files may not be identical to the input .class files, every Pack200 decompressor's outputted .class files will match every other Pack200 decompressor's output .class files.</p> <p>So your best bet is to Pack 'em with Pack200, unpack them, then do MD5 or comparable digest algorithm, and use that to verify the unpacked files.</p> <p>Hope that answers your question!</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload