Function cache_append_data

adapter/micro_thread/mt_cache.cpp:282–350

}

int32_t cache_append_data(TRWCache* cache, const void* data, uint32_t len)
{
    if ((NULL == data) || (NULL == cache) || (NULL == cache->pool)) 
    {
        return -1;
    }

    if (len == 0)
    {
        return 0;
    }

    uint32_t left = len;
    uint32_t remain = 0;

    TSkBuffer* tail = TAILQ_LAST(&cache->list, __sk_buff_list);
    if (tail != NULL)
    {
        if (tail->end > (tail->data + tail->data_len))
        {
            remain = tail->end - tail->data - tail->data_len;
        }
        
        if (remain >= len)
        {
            memcpy(tail->data + tail->data_len, data, len);
            tail->data_len += len;
            cache->len += len;
            return (int32_t)len;
        }
    }

    TRWCache keep_list;
    rw_cache_init(&keep_list, cache->pool);
    left -= remain;
    while (left > 0)
    {
        TSkBuffer* item = alloc_sk_buffer(cache->pool);
        if (item == NULL) 
        {
            rw_cache_destroy(&keep_list);
            return -2;
        }
        cache_append_buffer(&keep_list, item);

        if (left <= item->size)
        {
            memcpy(item->head, (char*)data + len - left, left);
            item->data_len = left;
            break;
        }
        
        memcpy(item->head, (char*)data + len - left, item->size);
        item->data_len = item->size;
        left -= item->size;
    }

    if ((tail != NULL) && (remain > 0))