Function addChunk

dependency/densecrf/examples/lodepng.cpp:4862–4867

chunkName must be string of 4 characters*/

/*chunkName must be string of 4 characters*/
static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length)
{
    CERROR_TRY_RETURN(lodepng_chunk_create(&out->data, &out->size, (unsigned)length, chunkName, data));
    out->allocsize = out->size; /*fix the allocsize again*/
    return 0;
}

static void writeSignature(ucvector* out)
{