/*
Read a particular block into the global array to be used for further
analysis later.
*/
static int
_cdio_read_block(const CdIo *cdio, int superblock, uint32_t offset,
uint8_t bufnum, track_t track_num)
{
unsigned int track_sec_count = cdio_get_track_sec_count(cdio, track_num);
memset(buffer[bufnum], 0, CDIO_CD_FRAMESIZE);
if ( track_sec_count < superblock) {
cdio_debug("reading block %u skipped track %d has only %u sectors\n",
superblock, track_num, track_sec_count);
return -1;
}
cdio_debug("about to read sector %lu\n",
(long unsigned int) offset+superblock);
if (cdio_get_track_green(cdio, track_num)) {
if (0 > cdio_read_mode2_sector(cdio, buffer[bufnum],
offset+superblock, false))
return -1;
} else {
if (0 > cdio_read_mode1_sector(cdio, buffer[bufnum],
offset+superblock, false))
return -1;
}
return 0;
}
static void
_fs_stat_root (const CdIo *cdio, iso9660_stat_t *stat, bool is_mode2)
{
char block[ISO_BLOCKSIZE] = { 0, };
const iso9660_pvd_t *pvd = (void *) █
const iso9660_dir_t *idr = (void *) pvd->root_directory_record;
if (is_mode2) {
if (cdio_read_mode2_sector (cdio, &block, ISO_PVD_SECTOR, false))
cdio_assert_not_reached ();
} else {
if (cdio_read_mode1_sector (cdio, &block, ISO_PVD_SECTOR, false))
cdio_assert_not_reached ();
}
_idr2statbuf (idr, stat, is_mode2);
}
int
cdio_read_mode1_sectors (const CdIo *cdio, void *data, lsn_t lsn,
bool is_form2, unsigned int num_sectors)
{
uint32_t size = is_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
int retval;
int i;
cdio_assert (cdio != NULL);
for (i = 0; i < num_sectors; i++) {
if ( (retval = cdio_read_mode1_sector (cdio,
((char *)data) + (size * i),
lsn + i, is_form2)) )
return retval;
}
return 0;
}
/*!
Read the Primary Volume Descriptor for of CD.
*/
bool
iso9660_fs_read_pvd(const CdIo_t *p_cdio, /*out*/ iso9660_pvd_t *p_pvd)
{
/* A bit of a hack, we'll assume track 1 contains ISO_PVD_SECTOR.*/
bool b_mode2;
char buf[CDIO_CD_FRAMESIZE_RAW] = { 0, };
int i_rc;
switch(cdio_get_track_format(p_cdio, 1)) {
case TRACK_FORMAT_CDI:
case TRACK_FORMAT_XA:
b_mode2 = true;
break;
case TRACK_FORMAT_DATA:
b_mode2 = false;
break;
case TRACK_FORMAT_AUDIO:
case TRACK_FORMAT_PSX:
case TRACK_FORMAT_ERROR:
default:
return false;
}
i_rc = b_mode2
? cdio_read_mode2_sector (p_cdio, buf, ISO_PVD_SECTOR, false)
: cdio_read_mode1_sector (p_cdio, buf, ISO_PVD_SECTOR, false);
if (i_rc) {
cdio_warn ("error reading PVD sector (%d)", ISO_PVD_SECTOR);
return false;
}
/* The size of a PVD or SVD is smaller than a sector. So we
allocated a bigger block above (buf) and now we'll copy just
the part we need to save.
*/
cdio_assert (sizeof(buf) >= sizeof (iso9660_pvd_t));
memcpy(p_pvd, buf, sizeof(iso9660_pvd_t));
return check_pvd(p_pvd);
}
/*!
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_fs_read_superblock (CdIo_t *p_cdio,
iso_extension_mask_t iso_extension_mask)
{
if (!p_cdio) return false;
{
generic_img_private_t *p_env = (generic_img_private_t *) p_cdio->env;
iso9660_pvd_t *p_pvd = &(p_env->pvd);
iso9660_svd_t *p_svd = &(p_env->svd);
char buf[CDIO_CD_FRAMESIZE_RAW] = { 0, };
bool b_mode2;
int i_rc;
/* A bit of a hack, we'll assume track 1 contains ISO_PVD_SECTOR.*/
switch(cdio_get_track_format(p_cdio, 1)) {
case TRACK_FORMAT_CDI:
case TRACK_FORMAT_XA:
b_mode2 = true;
break;
case TRACK_FORMAT_DATA:
b_mode2 = false;
break;
case TRACK_FORMAT_AUDIO:
case TRACK_FORMAT_PSX:
case TRACK_FORMAT_ERROR:
default:
return false;
}
if ( !iso9660_fs_read_pvd(p_cdio, p_pvd) )
return false;
p_env->i_joliet_level = 0;
i_rc = (b_mode2)
? cdio_read_mode2_sector (p_cdio, buf, ISO_PVD_SECTOR+1, false)
: cdio_read_mode1_sector (p_cdio, buf, ISO_PVD_SECTOR+1, false);
if (0 == i_rc) {
/* The size of a PVD or SVD is smaller than a sector. So we
allocated a bigger block above (buf) and now we'll copy just
the part we need to save.
*/
cdio_assert (sizeof(buf) >= sizeof (iso9660_svd_t));
memcpy(p_svd, buf, sizeof(iso9660_svd_t));
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_env->i_joliet_level = 1;
break;
case 0x43:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL2)
p_env->i_joliet_level = 2;
break;
case 0x45:
if (iso_extension_mask & ISO_EXTENSION_JOLIET_LEVEL3)
p_env->i_joliet_level = 3;
break;
default:
cdio_info("Supplementary Volume Descriptor found, but not Joliet");
}
if (p_env->i_joliet_level > 0) {
cdio_info("Found Extension: Joliet Level %d",
p_env->i_joliet_level);
}
}
}
}
}
return true;
}
