57 	if (block[510] != 0x55 || block[511] != 0xaa) {  in readboot()
63 	memset(boot, 0, sizeof *boot);  in readboot()
79 	if (boot->bpbSecPerClust == 0 || !powerof2(boot->bpbSecPerClust)) {  in readboot()
94 	if (boot->bpbFATs == 0) {  in readboot()
102 		/* bpbRootDirEnts = 0 suggests that we are FAT32 */  in readboot()
108 	if (boot->bpbSectors != 0 && (boot->flags & FAT32)) {  in readboot()
119 	if (boot->bpbFATsmall != 0 && (boot->flags & FAT32)) {  in readboot()
136 	if (boot->bpbHugeSectors == 0) {  in readboot()
140 		} else if (boot->bpbSectors == 0) {  in readboot()
146 		if (boot->bpbSectors != 0) {  in readboot()
164 		if (block[40] & 0x80)  in readboot()
165 			boot->ValidFat = block[40] & 0x0f;  in readboot()
189 		if (boot->bpbFSInfo == 0) {  in readboot()
207 		    || memcmp(fsinfo + 0x1e4, "rrAa", 4)  in readboot()
208 		    || fsinfo[0x1fc]  in readboot()
209 		    || fsinfo[0x1fd]  in readboot()
210 		    || fsinfo[0x1fe] != 0x55  in readboot()
211 		    || fsinfo[0x1ff] != 0xaa  in readboot()
212 		    || fsinfo[0x3fc]  in readboot()
213 		    || fsinfo[0x3fd]  in readboot()
214 		    || fsinfo[0x3fe] != 0x55  in readboot()
215 		    || fsinfo[0x3ff] != 0xaa) {  in readboot()
217 			if (ask(0, "Fix")) {  in readboot()
219 				memcpy(fsinfo + 0x1e4, "rrAa", 4);  in readboot()
220 				fsinfo[0x1fc] = fsinfo[0x1fd] = 0;  in readboot()
221 				fsinfo[0x1fe] = 0x55;  in readboot()
222 				fsinfo[0x1ff] = 0xaa;  in readboot()
223 				fsinfo[0x3fc] = fsinfo[0x3fd] = 0;  in readboot()
224 				fsinfo[0x3fe] = 0x55;  in readboot()
225 				fsinfo[0x3ff] = 0xaa;  in readboot()
236 				boot->bpbFSInfo = 0;  in readboot()
239 			boot->FSFree = fsinfo[0x1e8] + (fsinfo[0x1e9] << 8)  in readboot()
240 				       + (fsinfo[0x1ea] << 16)  in readboot()
241 				       + (fsinfo[0x1eb] << 24);  in readboot()
242 			boot->FSNext = fsinfo[0x1ec] + (fsinfo[0x1ed] << 8)  in readboot()
243 				       + (fsinfo[0x1ee] << 16)  in readboot()
244 				       + (fsinfo[0x1ef] << 24);  in readboot()
331 	boot->NumFree = 0;  in readboot()
347 	fsinfo[0x1e8] = (u_char)boot->FSFree;  in writefsinfo()
348 	fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);  in writefsinfo()
349 	fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);  in writefsinfo()
350 	fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);  in writefsinfo()
351 	fsinfo[0x1ec] = (u_char)boot->FSNext;  in writefsinfo()
352 	fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);  in writefsinfo()
353 	fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);  in writefsinfo()
354 	fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);  in writefsinfo()
373 	return 0;  in writefsinfo()