/**
* Loads a volume descriptor
* @param fs Filesystem
* @param type Type of volume descriptor
* @param buf Buffer for volume descriptor
* @return 0=success; -1=failure
*/
int iso9660_voldesc_load(struct cdi_fs_filesystem *fs,iso9660_voldesc_type_t type,void *buf) {
debug("iso9660_voldesc_load(0x%x,%d,0x%x)\n",fs,type,buf);
struct iso9660_voldesc header;
size_t i;
for (i=ISO9660_FIRST_SECTOR;header.type!=type && header.type!=ISO9660_VOLDESC_TERM;i++) {
iso9660_sector_read(fs,i*ISO9660_DEFAULT_SECTOR_SIZE,sizeof(header),&header);
if (!iso9660_voldesc_checksig(header.signature)) return -1;
}
i--;
if (header.type==type) {
iso9660_sector_read(fs,i*ISO9660_DEFAULT_SECTOR_SIZE,sizeof(struct iso9660_voldesc_prim),buf);
return 0;
}
else {
debug("Volume Descriptor: Wrong type: %d\n",header.type);
return -1;
}
}
/**
* Reads data from device for cache
* @param cache CDI cache
* @param block Block to read
* @param count How many blocks to read
* @param dest Buffer to store data in
* @param prv Private data (CDI filesystem)
*/
int iso9660_sector_read_cache(struct cdi_cache *cache,uint64_t block,size_t count,void *dest,void *prv) {
debug("iso9660_sector_read_cache(0x%x,0x%x,0x%x,0x%x,0x%x,0x%x)\n",cache,block,count,dest,prv);
uint64_t start = ((uint64_t)block)*ISO9660_DEFAULT_SECTOR_SIZE;
size_t size = count*ISO9660_DEFAULT_SECTOR_SIZE;
return iso9660_sector_read(prv,start,size,dest)/ISO9660_DEFAULT_SECTOR_SIZE;
}
