1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
#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);
|
