55 lines
1.5 KiB
C
Executable File
55 lines
1.5 KiB
C
Executable File
#include <stdint.h>
|
|
|
|
#define PKT_SIZE 2820
|
|
|
|
struct image_pkt_hdr {
|
|
uint32_t resend;
|
|
uint32_t totcrc;
|
|
uint32_t nr_blocks;
|
|
uint32_t blocksize;
|
|
uint32_t block_crc;
|
|
uint32_t block_nr;
|
|
uint32_t pkt_sequence;
|
|
uint16_t pkt_nr;
|
|
uint16_t nr_pkts;
|
|
uint32_t thislen;
|
|
uint32_t thiscrc;
|
|
};
|
|
|
|
struct image_pkt {
|
|
struct image_pkt_hdr hdr;
|
|
unsigned char data[PKT_SIZE];
|
|
};
|
|
|
|
struct fec_parms;
|
|
|
|
/* k - number of actual data packets
|
|
* n - total number of packets including data and redundant packets
|
|
* (actual packet size isn't relevant here) */
|
|
struct fec_parms *fec_new(int k, int n);
|
|
void fec_free(struct fec_parms *p);
|
|
|
|
/* src - array of (n) pointers to data packets
|
|
* fec - buffer for packet to be generated
|
|
* index - index of packet to be generated (0 <= index < n)
|
|
* sz - data packet size
|
|
*
|
|
* _linear version just takes a pointer to the raw data; no
|
|
* mucking about with packet pointers.
|
|
*/
|
|
void fec_encode(struct fec_parms *code, unsigned char *src[],
|
|
unsigned char *fec, int index, int sz);
|
|
void fec_encode_linear(struct fec_parms *code, unsigned char *src,
|
|
unsigned char *fec, int index, int sz);
|
|
|
|
/* data - array of (k) pointers to data packets, in arbitrary order (see i)
|
|
* i - indices of (data) packets
|
|
* sz - data packet size
|
|
*
|
|
* Will never fail as long as you give it (k) individual data packets.
|
|
* Will re-order the (data) pointers but not the indices -- data packets
|
|
* are ordered on return.
|
|
*/
|
|
int fec_decode(struct fec_parms *code, unsigned char *data[],
|
|
int i[], int sz);
|