Hello, Sean.
2012/8/4 Sean Bartell <[email protected]>:
> Hello, everyone,
>
> I've implemented conditions and repetition in Bithenge[0]. There are
> more examples in the test files[1].
Nice. I am still playing with my BMP script - with repetitions it
almost works but it would be very helpful to have some simple
expressions. At least comparisons and adding/multiplying with a
constant.
I also started working on a GIF script (to try something more cryptic)
and I encountered a problem which I think is actually a bug. Below is
my minimal example:
transform main = struct {
.kind <- uint8;
switch (.kind) {
0: { };
else: {
.str <- ascii <- known_length(.kind);
};
}
};
I would say that such script is syntactically okay and semantically it
shall express: treat some values specifically (here only 0) and for
the rest just skip following .kind bytes.
Running Bithenge with hex:00 works as expected and {"kind":0} is printed.
I would expect that for hex:0120, the output would be { "kind": 1,
"str": " "}. However, Bithenge prints {"kind": 1Error printing node:
No such file or directory.
But if the known_length(.kind) is changed to known_length(1), hex:0120
works as expected.
Ideas what could be wrong?
Otherwise, good job. I like the simple syntax though sometimes I am a
bit confused where is the semicolon required and where it is
prohibited ;-).
Bye,
- Vojta
>
> My next task is to implement bitfields. Decoding a sequence of bits is
> similar to decoding a sequence of bytes, so I will reuse the existing
> code and syntax as much as possible. I'm still two days late, partly
> because repetitions required more thought than I expected, but I'm still
> hoping to catch up.
>
> Thanks,
> Sean Bartell
>
> [0] http://trac.helenos.org/wiki/StructuredBinaryData#FlowControl
> [1]
> https://bazaar.launchpad.net/~wtachi/helenos/bithenge/files/head:/uspace/dist/src/bithenge/
>
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