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/**
* cell.h
* Cell definition.
*
* Matej Pfajfar <mp292@cam.ac.uk>
*/
/*
* Changes :
* $Log$
* Revision 1.1 2002/06/26 22:45:50 arma
* Initial revision
*
* Revision 1.14 2002/04/02 14:27:11 badbytes
* Final finishes.
*
* Revision 1.13 2002/03/03 00:06:45 mp292
* Modifications to support re-transmission.
*
* Revision 1.12 2002/02/09 17:51:52 mp292
* CELL_ACK should be 4 not 3
*
* Revision 1.11 2002/02/03 22:41:45 mp292
* Changes to cell size.
*
* Revision 1.10 2002/01/21 20:57:19 mp292
* Reviewed according to Secure-Programs-HOWTO.
*
* Revision 1.9 2002/01/17 15:00:43 mp292
* Fixed a bug which caused malloc() generate a seg fault.
*
* Revision 1.8 2002/01/14 13:05:37 badbytes
* System testing in progress.
*
* Revision 1.7 2002/01/10 13:15:54 badbytes
* Fixed ACI size from 32bits to 16bits.
*
* Revision 1.6 2002/01/09 08:10:32 badbytes
* *** empty log message ***
*
* Revision 1.5 2002/01/07 13:03:28 badbytes
* cell.ACI is now cell.aci
*
* Revision 1.4 2002/01/07 09:26:00 badbytes
* Added pack_create() and pack_data().
*
* Revision 1.3 2002/01/07 07:48:34 badbytes
* fixed new_create_cell()
*
* Revision 1.2 2002/01/04 12:08:34 badbytes
* Added functions for cell creation.
*
* Revision 1.1 2002/01/04 10:02:07 badbytes
* Added cell definition.
*
*/
#ifndef __CELL_H
#include <unistd.h>
#include <stdint.h>
/* cell commands */
#define CELL_PADDING 0
#define CELL_CREATE 1
#define CELL_DATA 2
#define CELL_DESTROY 3
#define CELL_ACK 4
#define CELL_NACK 5
#define CELL_PAYLOAD_SIZE 120
/* cell definition */
typedef struct
{
uint16_t aci; /* Anonymous Connection Identifier */
unsigned char command;
unsigned char length; /* of payload */
uint32_t seq; /* sequence number */
unsigned char payload[120];
} cell_t;
cell_t *new_padding_cell(void);
cell_t *new_create_cell(uint16_t aci, unsigned char length, unsigned char *buf);
cell_t *new_destroy_cell(uint16_t aci);
cell_t *new_data_cell(uint16_t aci, unsigned char length, unsigned char *buf);
cell_t *new_ack_cell(uint16_t aci);
cell_t *new_nack_cell(uint16_t aci);
int pack_create(uint16_t aci, unsigned char *onion, uint32_t onionlen, unsigned char **cellbuf, unsigned int *cellbuflen);
int pack_data(uint16_t aci, unsigned char *buf, size_t buflen, unsigned char **cellbuf, unsigned int *cellbuflen);
#define __CELL_H
#endif
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