def _get_tot_size(self):
tot = cur_lvl_size = align_to(self.size,
self.section_header.lvls[-1].block_size)
for n in reversed(range(IVFCSuperblock.IVFC_MAX_LEVEL - 1)):
cur_lvl_size = align_to(
cur_lvl_size // self.section_header.lvls[n].block_size * 0x20,
self.section_header.lvls[n - 1].block_size)
tot += cur_lvl_size
return tot
def _gen_dir_metadata(self, dir_entry):
if self.prev_dir is not None:
self.prev_dir.next = dir_entry
dir_entry.prev, self.prev_dir = self.prev_dir, dir_entry
dir_entry.hash = self._calc_path_hash(dir_entry.offsets['Parent'],
dir_entry.name.encode())
for child in dir_entry.childs:
self.dir_nb += 1
if dir_entry.offsets['Child'] == ROMFS_ENTRY_EMPTY:
dir_entry.offsets['Child'] = self.dir_table_size
child.offsets['Parent'] = dir_entry.offsets['Self']
child.offsets['Self'] = self.dir_table_size
self.dir_table_size += DirEntry.ROMFS_DIRENTRY_LENGTH + align_to(
len(child.name), 4)
self._gen_dir_metadata(child)
if child != dir_entry.childs[-1]:
child.offsets['Sibling'] = self.dir_table_size
else:
child.offsets['Sibling'] = ROMFS_ENTRY_EMPTY
for file_entry in dir_entry.files:
self.file_nb += 1
if self.prev_file is not None:
self.prev_file.next = file_entry
file_entry.prev, self.prev_file = self.prev_file, file_entry
if dir_entry.offsets['File'] == ROMFS_ENTRY_EMPTY:
dir_entry.offsets['File'] = self.file_table_size
file_entry.offsets['Parent'] = dir_entry.offsets['Self']
file_entry.offsets['Self'] = self.file_table_size
self.file_table_size += FileEntry.ROMFS_FILEENTRY_LENGTH + align_to(
len(file_entry.name), 4)
if file_entry != dir_entry.files[-1]:
file_entry.offsets['Sibling'] = self.file_table_size
else:
file_entry.offsets['Sibling'] = ROMFS_ENTRY_EMPTY
file_entry.hash = self._calc_path_hash(
file_entry.offsets['Parent'], file_entry.name.encode())
file_entry.offsets['Size'] = file_entry.size
file_entry.offsets['Data'] = self.data_size
self.data_size += align_to(file_entry.size, 0x10)
def _buffered_repack(self, block_size=0x4000, disp=True):
lvl_1, lvl_2, lvl_3, lvl_4, lvl_5 = self._gen_hash_tree(
block_size=block_size, disp=disp)
if disp:
print('Writing IVFC levels...')
yield lvl_1
yield (align_to(self.lvl_1_size, block_size) - self.lvl_1_size) * b'\0'
yield lvl_2
yield (align_to(self.lvl_2_size, block_size) - self.lvl_2_size) * b'\0'
yield lvl_3
yield (align_to(self.lvl_3_size, block_size) - self.lvl_3_size) * b'\0'
yield lvl_4
yield (align_to(self.lvl_4_size, block_size) - self.lvl_4_size) * b'\0'
yield lvl_5
yield (align_to(self.lvl_5_size, block_size) - self.lvl_5_size) * b'\0'
if disp:
print('Writing RomFS...')
written = 0
for buf in super(HashTreeWrappedRomFS,
self)._buffered_repack(disp=disp):
written += len(buf)
yield buf
yield (align_to(written, block_size) - written) * b'\0'
def read(self, length=None):
if self.crypto == 'None' or self.crypto == 'BTKR' or self.crypto == 'XTS':
data = super(NCA3.SectionInNCA3, self).read(length)
return data
elif self.crypto == 'CTR':
aligned_length = align_to(length + self.sector_offset, 0x10)
dec_data = self.cipher.decrypt(
super(NCA3.SectionInNCA3, self).read(aligned_length))
if aligned_length != length:
try:
return dec_data[self.sector_offset:length +
self.sector_offset]
finally: # Seek to what the offset should be if not for the crypto
self.seek(self.ifo + self.tell() - aligned_length +
length)
else:
return dec_data[:length]
