/*!
Read the Super block of an ISO 9660 image. This is the
Primary Volume Descriptor (PVD) and perhaps a Supplemental Volume
Descriptor if (Joliet) extensions are acceptable.
*/
bool
iso9660_ifs_read_superblock (iso9660_t *p_iso,
iso_extension_mask_t iso_extension_mask)
{
iso9660_svd_t p_svd; /* Secondary volume descriptor. */
int i;
if (!p_iso || !iso9660_ifs_read_pvd(p_iso, &(p_iso->pvd)))
return false;
p_iso->u_joliet_level = 0;
/* There may be multiple Secondary Volume Descriptors (eg. El Torito + Joliet) */
for (i=1; (0 != iso9660_iso_seek_read (p_iso, &p_svd, ISO_PVD_SECTOR+i, 1)); i++) {
if (ISO_VD_END == from_711(p_svd.type) ) /* Last SVD */
break;
if ( ISO_VD_SUPPLEMENTARY == from_711(p_svd.type) ) {
/* We're only interested in Joliet => make sure the SVD isn't overwritten */
if (p_iso->u_joliet_level == 0)
memcpy(&(p_iso->svd), &p_svd, sizeof(iso9660_svd_t));
if (p_svd.escape_sequences[0] == 0x25
&& p_svd.escape_sequences[1] == 0x2f) {
switch (p_svd.escape_sequences[2]) {
case 0x40:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL1)
p_iso->u_joliet_level = 1;
break;
case 0x43:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL2)
p_iso->u_joliet_level = 2;
break;
case 0x45:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL3)
p_iso->u_joliet_level = 3;
break;
default:
cdio_info("Supplementary Volume Descriptor found, but not Joliet");
}
if (p_iso->u_joliet_level > 0) {
cdio_info("Found Extension: Joliet Level %d", p_iso->u_joliet_level);
}
}
}
}
return true;
}
/*!
Read the Super block of an ISO 9660 image. This is the
Primary Volume Descriptor (PVD) and perhaps a Supplemental Volume
Descriptor if (Joliet) extensions are acceptable.
*/
bool
iso9660_ifs_read_superblock (iso9660_t *p_iso,
iso_extension_mask_t iso_extension_mask)
{
iso9660_svd_t *p_svd; /* Secondary volume descriptor. */
if (!p_iso || !iso9660_ifs_read_pvd(p_iso, &(p_iso->pvd)))
return false;
p_svd = &(p_iso->svd);
p_iso->i_joliet_level = 0;
if (0 != iso9660_iso_seek_read (p_iso, p_svd, ISO_PVD_SECTOR+1, 1)) {
if ( ISO_VD_SUPPLEMENTARY == from_711(p_svd->type) ) {
if (p_svd->escape_sequences[0] == 0x25
&& p_svd->escape_sequences[1] == 0x2f) {
switch (p_svd->escape_sequences[2]) {
case 0x40:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL1)
p_iso->i_joliet_level = 1;
break;
case 0x43:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL2)
p_iso->i_joliet_level = 2;
break;
case 0x45:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL3)
p_iso->i_joliet_level = 3;
break;
default:
cdio_info("Supplementary Volume Descriptor found, but not Joliet");
}
if (p_iso->i_joliet_level > 0) {
cdio_info("Found Extension: Joliet Level %d", p_iso->i_joliet_level);
}
}
}
}
return true;
}
