How to concatenate boost crc16 checksum ?

[Pechkin]

Good Day.
I transfer a packet by chunks and use boost library for computing crc (16 bits) of packet.
I obtain other checksums for whole byte's array and concatenation by chunks.
For example:
step1 (transfer of first chunk)

boost::crc_16_type  crcobject;
...
                memcpy(ba_tosocket->data()+offset,(char *)&bin_tosocket[0],headersize);
                crcobject.reset(0);
                crcobject.process_bytes(ba_tosocket->data(),headersize);
                bin_tosocket[3] = crcobject.checksum();

boost::crc_16_type  crcobject;
...
                memcpy(ba_tosocket->data()+offset,(char *)&bin_tosocket[0],headersize);
                crcobject.reset(0);
                crcobject.process_bytes(ba_tosocket->data(),headersize);
                bin_tosocket[3] = crcobject.checksum();

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step2 (transfer of second chunk)

memcpy(ba_tosocket->data()+offset,batmp.data(),dataframesize);
                crcobject.reset(bin_tosocket[3]);
                crcobject.process_bytes(ba_tosocket->data(),dataframesize);
                bin_tosocket[3] = crcobject.checksum();

memcpy(ba_tosocket->data()+offset,batmp.data(),dataframesize);
                crcobject.reset(bin_tosocket[3]);
                crcobject.process_bytes(ba_tosocket->data(),dataframesize);
                bin_tosocket[3] = crcobject.checksum();

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First and second chunks were aligned on word's margin (16 bits).
Is it right approach for concatenation of CRCs ?

[Pechkin]

Thank's for attention.
The problem is solved.