On Wed December 31 2008, Frank B. Brokken wrote:
> Hi William,
>
> Thanks for your reply. I followed your suggestion and changed the buffer size
> to 480: where the original program shows `500' it now has
> `480'. Unfortunately, after uncommenting the `Doesn't work' section the
> problem remains. Only the first block is decoded. Since 480 clearly fits the
> requirement of being divisible by both 8 and 6 I'm slightly worried about how
> to `find the exact point where an 8 bit is not shared'.
>
> So I thought about reading larger chunks and extracting a smaller number of
> characters so as not to exhaust the input buffer. After all extracting in
> blocks from a s_mem that completely contains the encoded file works fine, so
> why not do it while s_mem is being filled?
>
> But this was met with variable results: reading blocks of 700 bytes and then
> converting 480 bytes after each read-operation works fine, but reading blocks
> of 500 bytes and then extracting blocks of 240 bytes fails.
>
Are you stripping the bytes that might appear in the stream
that do not represent encoded characters or a part of the count?
> Somehow I don't like this shotgun-approach, thinking that there must be a more
> systematic way to handle my problem....
>
There is, I posted the link to one such solution. Have you read it?
> Anyway, here are the essential changes I made to read + extract information:
>
Is this a homework assignment?
Mike
> size_t const bufSize = 700;
> size_t const readBlock = 480;
>
> while ((inlen = fread(inbuf, 1, bufSize, stdin)) != 0)
> {
> BIO_write(mem, inbuf, inlen);
> BIO_flush(mem);
> // decode some chars at each
> // read from stdin
> inlen = BIO_read(bio, inbuf, readBlock);
>
> if (inlen <= 0) // once this happens no more
> break; // successful decodes occur
>
> fwrite(inbuf, 1, inlen, stdout);
> }
>
> So, thanks again for the reply, but I think I'm still looking for a general
> (algorithmic) solution....
>
> Cheers,
>
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