Re: [Boost-users] Compress to buffer

Subject: Re: [Boost-users] Compress to buffer
From: Kenneth Adam Miller (kennethadammiller_at_[hidden])
Date: 2014-01-14 10:09:53

So, I found that I could use a array_sink and pass it the location and size
of an array to use. But now I need to know, when bytes are written in, how
much is written into it in order that I can get that exact data out. I also
need to make sure that, in the case of something like not enough space
occurring, I can still get the rest of the data compressed.

Is there anything that I can pass to an array_sink initializer other than a
char * pointer that might help me accomplish this?

On Tue, Jan 14, 2014 at 8:20 AM, Kenneth Adam Miller <
kennethadammiller_at_[hidden]> wrote:

> I have an object for which operator << is defined, myobj.
>
> I want to compress into a buffer, and I know that this can be done with
> boost. I would prefer a buffer that dynamically resizes, but that only
> allocates new space, preferably treating discontiguous space brought on by
> new allocations as though the whole buffer was one piece; I don't want to
> find that it's copying data at all. So vector won't work as a buffer;
> there's no need for it to be contiguous, just as fast as possible.
>
> I've been trying to do this with filtering_istreambuf by pushing a
> bzip2_compressor (any compression filter will work). So far, it's giving me
> a lot of trouble. I did find an example where a string was passed to a
> function, but they went through a process where they first moved the string
> into an stringstream. I don't want to settle for that extra copy either.
>
> What would be nice is to be able to do something like
>
> compressor << myobj
>
> compressor.buf(); //returns compressed myobj output
>