1 /* Prototype stuff for parsing Level-II data */
3 * TODO: ARGG, the packet sizses are all wrong..
4 * Check sizes of decompressed bzip files
5 * Split things back up to seperate files
6 * The second bzip contains different size packets?
17 level2_packet_t **level2_split_packets(char *data, int *num_packets, int data_size)
20 level2_packet_t *packet = (level2_packet_t *)data;
21 int max_packets = 128;
22 level2_packet_t **packets = malloc(sizeof(level2_packet_t *)*max_packets);
23 while ((void *)packet < (void *)(data+data_size)) {
24 /* Increase packets size if necessasairy */
25 if (packet_i >= max_packets) {
27 packets = realloc(packets, sizeof(level2_packet_t *)*max_packets);
30 /* Fix byte order for packet */
31 packet->size = g_ntohs(packet->size);
32 packet->seq = g_ntohs(packet->seq);
33 // TODO: Convert the rest of the bytes
35 /* Save packet location */
36 packets[packet_i] = packet;
38 /* Increment packet and packet_i */
39 // new = old + CTM + 2*size + fcs
40 //packet = (level2_packet_t *)( ((char *)packet) + 12 + 2*packet->size + 4 );
44 packets = realloc(packets, sizeof(level2_packet_t *)*packet_i);
45 *num_packets = packet_i;
49 level2_packet_t *level2_decompress(char *raw_data, int *num_packets)
52 FILE *fd = fopen(raw_data, "r");
54 error(1, errno, "Error opening files `%s'", raw_data);
55 level2_header_t header;
56 if (1 != fread(&header, sizeof(level2_header_t), 1, fd))
57 error(1, errno, "Error reading header");
59 /* Decompress the bzips
60 * store the entire sequence starting at data
61 * cur_data is for each individual bzip and is the last chunk of data */
63 int data_size = 0; // size of previously decmpressed data
64 char *bz2 = NULL; // temp buf for bzipped data
65 unsigned int _bz2_size = 0;
66 while ((int)_bz2_size >= 0) {
67 if (1 != fread(&_bz2_size, 4, 1, fd))
68 break; //error(1, errno, "Error reading _bz2_size, pos=%x", (unsigned int)ftell(fd));
69 _bz2_size = g_ntohl(_bz2_size);
70 int bz2_size = abs(_bz2_size);
73 if (NULL == (bz2 = (char *)realloc(bz2, bz2_size)))
74 error(1, errno, "cannot allocate `%d' bytes for buffer", bz2_size);
75 if (bz2_size != fread(bz2, 1, bz2_size, fd))
76 error(1, errno, "error reading from input file");
78 /* Decompress on individual bzip to the end of the sequence */
79 unsigned int cur_data_size = 1<<17;
80 int status = BZ_OUTBUFF_FULL;
81 while (status == BZ_OUTBUFF_FULL) {
83 data = realloc(data, data_size + cur_data_size);
84 status = BZ2_bzBuffToBuffDecompress(data + data_size, &cur_data_size, bz2, bz2_size, 0, 0);
87 error(1, 1, "Error decompressing data");
88 data_size += cur_data_size; // Add current chunk to decompressed data
91 printf("data_size = %d, cur_data_size = %d\n", data_size, cur_data_size);
93 data = realloc(data, data_size); // free unused space at the end
95 return (level2_packet_t *)data;
96 //return level2_split_packets(data, num_packets, data_size);
99 int main(int argc, char **argv)
102 printf("usage: %s <level2-data>\n", argv[0]);
107 level2_packet_t *packets = level2_decompress(argv[1], &num_packets);
108 printf("read %d packets\n", num_packets);
110 //FILE *output = fopen("output.dat", "w+");
111 //fwrite(packets[i], 1, 18470816, output);
114 FILE *output = fopen("output.dat", "w+");
116 for (i = 0; i < 10000; i++) {
117 printf("packet: size=%x, seq=%d\n", g_ntohs(packets[i].size), g_ntohs(packets[i].seq));
118 fwrite("################", 1, 16, output);
119 fwrite(packets+i, 1, sizeof(level2_packet_t), output);