[armedbear-devel] is there a good method to read/write java byte arrays?

Alessio Stalla alessiostalla at gmail.com
Wed Mar 17 16:32:46 UTC 2010

On Wed, Mar 17, 2010 at 5:22 PM, Mark Evenson <evenson at panix.com> wrote:
> On 3/17/10 5:04 PM, Alessio Stalla wrote:
> […]
>> I wrote sys::%make-byte-array-output-stream in order to make the
>> runtime compiler capable of generating bytecode without using
>> temporary files; it wasn't meant to be used by the ABCL user, and as
>> such it's not very polished (for example, the type of a
>> byte-array-output-stream is simply STREAM). In any case, it's defined
>> in the ByteArrayOutputStream Java class, and as you correctly noted,
>> it explicitly sets the element type to (unsigned-byte 8). As a quick
>> and dirty solution, you could more or less copy-paste that class and
>> replace "output" with "input" :) (as well as update Autoload.java to
>> make ABCL know of the new primitives).
>> We should probably polish it a bit and release it as an extension.
> Well, at least we should quickly  whip out the inverse version so David
> doesn't have to rely on hacking Stream.java (although I'm not sure when
> telling Stream that initAsBinaryStream() means a format of unsigned 8bit
> bytes will fail).
> I think we can commit to the interface you've implemented in
> ByteArrayOutputStream, as those are the basic necessary operations.
> Or maybe I am not seeing what potential problems there would be with
> this as a short-term strategy, Alessio?

No problem at all in the implementation per se; however, when we'll
make it an "official" extension, the interface will change (if
anything, symbols won't probably be in sys anymore and they won't be
prefixed with %). Since this functionality will have approximately 1
user in the near future :), I think it's ok to commit a quick fix for
David. I'm working on it right now.


> --
> "A screaming comes across the sky.  It has happened before, but there
> is nothing to compare to it now."
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