| 
 Data Structures | 
| struct   | pbuf | 
 Defines | 
| #define  | PBUF_TRANSPORT_HLEN   20 | 
| #define  | PBUF_IP_HLEN   20 | 
| #define  | PBUF_FLAG_RAM   0x00 | 
| #define  | PBUF_FLAG_ROM   0x01 | 
| #define  | PBUF_FLAG_POOL   0x02 | 
 Enumerations | 
| enum   | pbuf_layer { PBUF_TRANSPORT, 
PBUF_IP, 
PBUF_LINK, 
PBUF_RAW
 } | 
| enum   | pbuf_flag { PBUF_RAM, 
PBUF_ROM, 
PBUF_POOL
 } | 
 Functions | 
| void  | pbuf_init (void) | 
| pbuf *  | pbuf_alloc (pbuf_layer l, uInt16 size, pbuf_flag flag) | 
| void  | pbuf_realloc (struct pbuf *p, uInt16 size) | 
| uInt8  | pbuf_header (struct pbuf *p, Int16 header_size) | 
| void  | pbuf_ref (struct pbuf *p) | 
| uInt8  | pbuf_free (struct pbuf *p) | 
| uInt8  | pbuf_clen (struct pbuf *p) | 
| void  | pbuf_chain (struct pbuf *h, struct pbuf *t) | 
| pbuf *  | pbuf_dechain (struct pbuf *p) |