1 files changed, 54 insertions, 0 deletions
diff --git a/misc-utils/mcast_image.h b/misc-utils/mcast_image.h
new file mode 100644
index 0000000..8e94ffa
--- /dev/null
+++ b/misc-utils/mcast_image.h
@@ -0,0 +1,54 @@
+#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);