I've been getting further towards the Pack200 implementation with finishing off the codecs that are used to decode values from the file. Although most of the default codecs were in place, the pack200 spec allows for dynamic switching to arbitrary codecs should the compressor warrant it, including a population-based encoding for (in)frequent values. I've submitted Harmony 1019 with the patch; if someone could apply that, I'd be grateful.
At present, the pack200 algorithm gets as far as the inner class definitions, but I've still got to decode the annotations and bytecode. I'm thinking that as a first-cut, I will ignore any pack files with annotations in and plough through the bytecode so that we can at least start using it for simple pack files. I've got a bit of work left to integrate the dynamic switching of band encodings (but that's OK since most of the simple pack files only use the default) that will involve a bit of refactoring, and essentially then just the bytecode (as long as there are no annotations). I don't think it will be too long before we can unpack simple files on some of the lower-quality settings :-) Also, when I get around to implementing some of the coding (as opposed to decoding), I'm pretty sure that some of the techniques might be useful for compressing arbitrary data streams. It would be interesting to see what other uses there are for the codecs. Onwards, upwards, and/or sideways, Alex. --------------------------------------------------------------------- Terms of use : http://incubator.apache.org/harmony/mailing.html To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
