On Nov 23, 12:03 pm, Zach Tellman <ztell...@gmail.com> wrote:
> When writing Calx [1], I discovered it was a huge pain to deal with
> mixed C datatypes in Java. When writing Aleph [2], I discovered the
> problem increases by a factor of ten when dealing with streams of
> bytes. In an attempt to alleviate my own pain, and hopefully help a
> few other people out, I've written Gloss, which can transform a simple
> byte-format specification into an encoder and streaming decoder.
>
> A full writeup can be found athttps://github.com/ztellman/gloss/wiki.
>
> A few people have already asked me how this differs from protocol
> buffers, so I'll preemptively answer that protocol buffers are a fixed
> format that cannot be used to interface with external systems. Gloss
> is less performant than protocol buffers, but is also much less picky
> about formats.
>
> If anyone has any questions, I'd be happy to answer them.
>
Looks very useful, Zach. Thanks.
I have a question.
I have only taken a quick look, so maybe I'm misunderstanding the
intent, but it's not clear to me how you would use this for sending
and receiving structured data from, say, a C program.
Taking your example from the wiki:
(def fr (compile-frame {:a :int16, :b :float32}))
Let's say I want to talk to a C program that speaks in structs, like
this:
struct Foo { short a; float b; }
The problem is, the C program cares about order - the short comes
before the float. How does the Clojure program know what order I need
the fields in, since I have specified the format with a map; an
unordered data structure? Is there another way to specify a structure
where order of the fields matters? If so, why have two ways of doing
it? Or am I just missing something?
Thanks,
- Chris
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