Reading and writing CBOR documents in pieces

Hi,

Is it possible to parse and and emit a CBOR document in parts? The use case here is where I might have a CBOR file that's in the order of 2kB in size, but I don't want to allocate a 2kB buffer to read the whole thing in one go (I've allocated 4kB for a stack and don't have a lot of heap space available).

The thinking is when reading, I might allocate a 256 or 512-byte buffer (on the stack), read the first buffer-full worth of data, then call the parser on that. As I get near the end, I watch for `CborErrorAdvancePastEOF`… when this happens, I obtain a copy of TinyCBOR's read pointer, do a `memmove` to move the unread data to the start of my buffer, `read` some more in, then tell TinyCBOR to move back to the start of the buffer to resume reading whatever CBOR value was being pointed to at the time.

Likewise writing; when `CborErrorOutOfMemory` is encountered, I can do a `write` of the buffer, then tell TinyCBOR to continue from the start of the buffer and resume writing the output.

Such a feature would *really* work well with CoAP block-wise transfers, as the data could be effectively "streamed" instead of having to buffer the lot.

I tried looking around for whether there was a flag I could specify on the decoder, but couldn't see any flags in the documentation.

Regards,
Stuart Longland