size_t data_length() const noexcept {
if (is_ext2())
return __builtin_bswap64(*(uint64_t*) vla) & 0xffffffff;
if (is_ext())
return __builtin_bswap16(*(uint16_t*) vla);
return payload();
}
void filesys_init (bool format){
fs_device = block_get_role(BLOCK_FILESYS);
if(fs_device == NULL)
PANIC("No file system device found, can't initialize file system.");
if(is_ext2(fs_device) == false)
PANIC("Device file system not recognised!");
else {
ext2_init();
ext2_register(fs_device);
printf("File system type: ext2.\n");
}
}
void set_payload(const size_t len)
{
uint16_t pbits = len;
if (len > 65535) pbits = 127;
else if (len > 125) pbits = 126;
bits &= 0x80ff;
bits |= (pbits & 0x7f) << 8;
if (is_ext())
*(uint16_t*) vla = __builtin_bswap16(len);
else if (is_ext2())
*(uint64_t*) vla = __builtin_bswap64(len);
assert(data_length() == len);
}
size_t data_offset() const noexcept {
size_t len = mask_length();
if (is_ext2()) return len + 8;
if (is_ext()) return len + 2;
return len;
}
int guess_filesystem(int start_session)
{
int ret = 0;
read_super(start_session);
#undef _DEBUG
#ifdef _DEBUG
/* buffer is defined */
if (is_cdi()) printf("CD-I, ");
if (is_cd_rtos()) printf("CD-RTOS, ");
if (is_isofs()) printf("ISOFS, ");
if (is_hs()) printf("HS, ");
if (is_bridge()) printf("BRIDGE, ");
if (is_xa()) printf("XA, ");
if (is_cdtv()) printf("CDTV, ");
puts("");
#endif
/* filesystem */
if (is_cdi() && is_cd_rtos() && !is_bridge() && !is_xa()) {
return FS_INTERACTIVE;
} else { /* read sector 0 ONLY, when NO greenbook CD-I !!!! */
read_super2(start_session);
#ifdef _DEBUG
/* buffer2 is defined */
if (is_photocd()) printf("PHOTO CD, ");
if (is_hfs()) printf("HFS, ");
if (is_ext2()) printf("EXT2 FS, ");
puts("");
#endif
if (is_hs())
ret |= FS_HIGH_SIERRA;
else if (is_isofs()) {
if (is_cd_rtos() && is_bridge())
ret = FS_ISO_9660_INTERACTIVE;
else if (is_hfs())
ret = FS_ISO_HFS;
else
ret = FS_ISO_9660;
isofs_size = get_size();
read_super4(start_session);
#ifdef _DEBUG
/* buffer4 is defined */
if (is_bootable()) printf("BOOTABLE, ");
puts("");
#endif
if (is_bootable())
ret |= BOOTABLE;
if (is_bridge() && is_xa() && is_isofs() && is_cd_rtos()) {
read_super5(start_session);
#ifdef _DEBUG
/* buffer5 is defined */
if (is_video_cdi()) printf("VIDEO-CDI, ");
puts("");
#endif
if (is_video_cdi())
ret |= VIDEOCDI;
}
} else if (is_hfs())
ret |= FS_HFS;
else if (is_ext2())
ret |= FS_EXT2;
else {
read_super3(start_session);
#ifdef _DEBUG
/* buffer3 is defined */
if (is_ufs()) printf("UFS, ");
puts("");
#endif
if (is_ufs())
ret |= FS_UFS;
else
ret |= FS_UNKNOWN;
}
}
/* other checks */
if (is_xa())
ret |= XA;
if (is_photocd())
ret |= PHOTO_CD;
if (is_cdtv())
ret |= CDTV;
return ret;
}
