swDataBuffer_trunk *swDataBuffer_getTrunk(swDataBuffer *data_buffer, swDataBuffer_item *item)
{
//第一次使用
if (item->last == NULL)
{
item->last = item->first;
//printf("1.-------------------------last=%p|first=%p\n", item->last, item->first);
return item->first;
}
//当前的trunk为空，可直接使用
else if (item->last->len == 0)
{
//printf("3.-------------------------\n");
return item->last;
}
//当前trunk
else
{
//printf("2.-------------------------\n");
swDataBuffer_trunk *trunk = swDataBuffer_newTrunk(data_buffer, item);
if (trunk == NULL)
{
swWarn("dataBufer: create trunk fail\n");
return NULL;
}
item->last->next = trunk;
trunk->pre = item->last;
item->last = trunk;
return trunk;
}
}
swDataBuffer_item* swDataBuffer_newItem(swDataBuffer *data_buffer, int fd, int trunk_size)
{
swDataBuffer_item *newItem = sw_malloc(sizeof(swDataBuffer_item));
//内存分配失败
if (newItem == NULL)
{
swWarn("malloc for newItem failed. Error: %s[%d]", strerror(errno), errno);
return NULL;
}
bzero(newItem, sizeof(swDataBuffer_item));
//创建item时，自动建立一个trunk
swDataBuffer_trunk *newTrunk = swDataBuffer_newTrunk(data_buffer, newItem);
if (newTrunk == NULL)
{
sw_free(newItem);
swWarn("malloc for newTrunk failed. Error: %s[%d]", strerror(errno), errno);
return NULL;
}
newItem->fd = fd;
swHashMap_add_int(&data_buffer->map, fd, newItem);
return newItem;
}
swDataBuffer_item* swDataBuffer_newItem(swDataBuffer *data_buffer, int fd, int trunk_size)
{
swDataBuffer_item *newItem = sw_malloc(sizeof(swDataBuffer_item));
//创建item时，自动建立一个trunk
swDataBuffer_trunk *newTrunk = swDataBuffer_newTrunk(data_buffer, newItem);
if (newItem == NULL)
{
return NULL;
}
else if (newTrunk == NULL)
{
sw_free(newItem);
return NULL;
}
else
{
bzero(newItem, sizeof(swDataBuffer_item));
newItem->fd = fd;
HASH_ADD_INT(data_buffer->ht, fd, newItem);
newItem->first = newTrunk;
return newItem;
}
return NULL;
}
