static int
getFAT32VolumeDescription( BVRef bvr, char *str, long strMaxLen)
{
struct fat32_header {
unsigned char code[3];
unsigned char oem_id[8];
unsigned char data[56];
unsigned long serial;
unsigned char label[11];
unsigned char fsid[8];
unsigned char reserved[420];
unsigned short signature;
} __attribute__((packed));
char *buf, *name;
struct fat32_header *fat32_p;
int label_len = sizeof(fat32_p->label);
int error;
buf = (char *)malloc(BPS);
name = (char *)malloc(label_len + 1);
fat32_p = (struct fat32_header *)buf;
diskSeek(bvr, 0ULL);
error = diskRead(bvr, (long)buf, BPS);
if ( error ) return 0;
if (fat32_p->signature != 0xaa55) return 0;
if (strMaxLen < label_len) label_len = strMaxLen;
strncpy(str, fat32_p->label, label_len);
str[label_len] = '\0';
return 1;
}
Byte* getDiskBlock (BlkNo blk) {
int hash = blk%CACHESIZE;
if (diskCacheMap[hash]==blk)
return diskCache[hash];
if (diskCacheMap[hash]!=0)
diskWrite(diskCacheMap[hash],diskCache[hash]);
diskCacheMap[hash] = blk;
diskRead(blk,diskCache[hash]);
return diskCache[hash];
}
Byte* getDiskBlock (BlkNo blk) {
int base=blk%CACHESIZE;
int cursor=base;
for (int i=0; i<CACHESIZE; i++) {
cursor=(base+i)%CACHESIZE;
if (diskCacheMap[cursor]==blk) return diskCache[cursor];
if (diskCacheMap[cursor]==0) break;
}
if (diskCacheMap[cursor]!=0){
cursor=base;
diskWrite(diskCacheMap[cursor],diskCache[cursor]);
}
diskCacheMap[cursor] = blk;
diskRead(blk,diskCache[cursor]);
return diskCache[cursor];
}
