9 is_extended(int type) {
10 return (type == 5 || type == 0xf || type == 0x85);
13 /* assemble badly aligned little endian integer */
14 static inline unsigned int
15 assemble4le(unsigned char *p) {
16 return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
19 static inline unsigned int
20 partition_start(struct partition *p) {
21 return assemble4le(&(p->start_sect[0]));
24 static inline unsigned int
25 partition_size(struct partition *p) {
26 return assemble4le(&(p->nr_sects[0]));
30 read_extended_partition(int fd, struct partition *ep,
31 struct slice *sp, int ns, int ssf)
34 unsigned long start, here;
40 here = start = partition_start(ep);;
47 bp = getblock(fd, here);
51 if (bp[510] != 0x55 || bp[511] != 0xaa)
54 p = (struct partition *) (bp + 0x1be);
56 for (i=0; i<2; i++, p++) {
57 if (partition_size(p) == 0 || is_extended(p->sys_type))
60 sp[n].start = (here + partition_start(p)) * ssf;
61 sp[n].size = partition_size(p) * ssf;
65 "dos_extd_partition: too many slices\n");
72 for (i=0; i<2; i++, p++) {
73 if (partition_size(p) != 0 &&
74 is_extended(p->sys_type)) {
75 here = start + partition_start(p);
86 return (type == 0xEE);
90 read_dos_pt(int fd, struct slice all, struct slice *sp, int ns) {
92 unsigned long offset = all.start;
97 bp = getblock(fd, offset);
101 if (bp[510] != 0x55 || bp[511] != 0xaa)
104 /* msdos PT depends sector size... */
105 if (blkdev_get_sector_size(fd, &ssf) != 0)
106 ssf = DEFAULT_SECTOR_SIZE;
108 /* ... but partx counts everything in 512-byte sectors */
111 p = (struct partition *) (bp + 0x1be);
112 for (i=0; i<4; i++) {
113 if (is_gpt(p->sys_type))
117 p = (struct partition *) (bp + 0x1be);
118 for (i=0; i<4; i++) {
119 /* always add, even if zero length */
121 sp[n].start = partition_start(p) * ssf;
122 sp[n].size = partition_size(p) * ssf;
126 "dos_partition: too many slices\n");
131 p = (struct partition *) (bp + 0x1be);
132 for (i=0; i<4; i++) {
133 if (is_extended(p->sys_type))
134 n += read_extended_partition(fd, p, sp+n, ns-n, ssf);