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net: lwm2m: introduce getter/setter for OPAQUE data

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Each content formatter should have a way of handling opaque data.

For instance TLV data will individually be able to specify a length
but plain text will take up the rest of the packet.

Signed-off-by: Michael Scott <michael.scott@linaro.org>
This commit is contained in:
Michael Scott 2017-10-26 23:32:47 -07:00 • committed by Jukka Rissanen
commit dd95dbcd9e
6 changed files with 84 additions and 5 deletions
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24
subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -1834,6 +1834,30 @@ static int lwm2m_read_handler(struct lwm2m_engine_obj_inst *obj_inst,
return 0;
}
size_t lwm2m_engine_get_opaque_more(struct lwm2m_input_context *in,
u8_t *buf, size_t buflen, bool *last_block)
{
u16_t in_len = in->opaque_len;
if (in_len > buflen) {
in_len = buflen;
}
in->opaque_len -= in_len;
if (in->opaque_len == 0) {
*last_block = true;
}
in->frag = net_frag_read(in->frag, in->offset, &in->offset, in_len,
buf);
if (!in->frag && in->offset == 0xffff) {
*last_block = true;
return 0;
}
return (size_t)in_len;
}
/* This function is exposed for the content format writers */
int lwm2m_write_handler(struct lwm2m_engine_obj_inst *obj_inst,
struct lwm2m_engine_res_inst *res,