1 /* Prototype stuff for parsing Level-II data */
3 * TODO: ARGG, the packet sizses are all wrong..
4 * Check sizes of decompressed bzip files
15 level2_packet_t **level2_split_packets(char *data, int *num_packets, int data_size)
18 level2_packet_t *packet = (level2_packet_t *)data;
19 int max_packets = 128;
20 level2_packet_t **packets = malloc(sizeof(level2_packet_t *)*max_packets);
21 while ((void *)packet < (void *)(data+data_size)) {
22 /* Increase packets size if necessasairy */
23 if (packet_i >= max_packets) {
25 packets = realloc(packets, sizeof(level2_packet_t *)*max_packets);
28 /* Fix byte order for packet */
29 packet->size = g_ntohs(packet->size);
30 packet->seq = g_ntohs(packet->seq);
31 // TODO: Convert the rest of the bytes
33 /* Save packet location */
34 packets[packet_i] = packet;
36 /* Increment packet and packet_i */
37 // new = old + CTM + 2*size + fcs
38 //packet = (level2_packet_t *)( ((char *)packet) + 12 + 2*packet->size + 4 );
42 packets = realloc(packets, sizeof(level2_packet_t *)*packet_i);
43 *num_packets = packet_i;
47 level2_packet_t *level2_decompress(char *raw_data, int *num_packets)
50 FILE *fd = fopen(raw_data, "r");
52 error(1, errno, "Error opening files `%s'", raw_data);
53 level2_header_t header;
54 if (1 != fread(&header, sizeof(level2_header_t), 1, fd))
55 error(1, errno, "Error reading header");
57 /* Decompress the bzips
58 * store the entire sequence starting at data
59 * cur_data is for each individual bzip and is the last chunk of data */
61 int data_size = 0; // size of previously decmpressed data
62 char *bz2 = NULL; // temp buf for bzipped data
63 unsigned int _bz2_size = 0;
64 while ((int)_bz2_size >= 0) {
65 if (1 != fread(&_bz2_size, 4, 1, fd))
66 break; //error(1, errno, "Error reading _bz2_size, pos=%x", (unsigned int)ftell(fd));
67 _bz2_size = g_ntohl(_bz2_size);
68 int bz2_size = abs(_bz2_size);
71 if (NULL == (bz2 = (char *)realloc(bz2, bz2_size)))
72 error(1, errno, "cannot allocate `%d' bytes for buffer", bz2_size);
73 if (bz2_size != fread(bz2, 1, bz2_size, fd))
74 error(1, errno, "error reading from input file");
76 /* Decompress on individual bzip to the end of the sequence */
77 unsigned int cur_data_size = 1<<17;
78 int status = BZ_OUTBUFF_FULL;
79 while (status == BZ_OUTBUFF_FULL) {
81 data = realloc(data, data_size + cur_data_size);
82 status = BZ2_bzBuffToBuffDecompress(data + data_size, &cur_data_size, bz2, bz2_size, 0, 0);
84 data_size += cur_data_size; // Add current chunk to decompressed data
87 //printf("data_size = %d, cur_data_size = %d\n", data_size, cur_data_size);
89 data = realloc(data, data_size); // free unused space at the end
91 return (level2_packet_t *)data;
92 //return level2_split_packets(data, num_packets, data_size);
95 int main(int argc, char **argv)
98 printf("usage: %s <level2-data>\n", argv[0]);
103 level2_packet_t *packets = level2_decompress(argv[1], &num_packets);
104 printf("read %d packets\n", num_packets);
106 //FILE *output = fopen("output.dat", "w+");
107 //fwrite(packets[i], 1, 18470816, output);
110 FILE *output = fopen("output.dat", "w+");
112 for (i = 0; i < 10000; i++) {
113 printf("packet: size=%x, seq=%d\n", g_ntohs(packets[i].size), g_ntohs(packets[i].seq));
114 fwrite("################", 1, 16, output);
115 fwrite(packets+i, 1, sizeof(level2_packet_t), output);