def scan_root(self):
"""Step 2: scan root block.
Try to determine root block from boot block or guess number.
Returns True if the root block could be decoded.
"""
if self.boot != None:
# retrieve root block number from boot block
root_blk_num = self.boot.got_root_blk
# check root block number
if root_blk_num == 0:
new_root = self.blkdev.num_blocks // 2
self.log.msg(Log.INFO,"Boot contains not Root blk. Using default: %d" % new_root,root_blk_num)
root_blk_num = new_root
elif root_blk_num < self.blkdev.reserved or root_blk_num > self.blkdev.num_blocks:
new_root = self.blkdev.num_blocks // 2
self.log.msg(Log.INFO,"Invalid root block number: given %d using guess %d" % (root_blk_num, new_root),root_blk_num)
root_blk_num = new_root
else:
# guess root block number
root_blk_num = self.blkdev.num_blocks // 2
self.log.msg(Log.INFO,"Guessed root block number",root_blk_num)
# read root block
root = RootBlock(self.blkdev, root_blk_num)
root.read()
if not root.valid:
self.log.msg(Log.INFO,"Root block is not valid -> No file system",root_blk_num)
self.root = None # mode without root
return False
else:
self.root = root
return True
def scan_root(self):
"""Step 2: scan root block.
Try to determine root block from boot block or guess number.
Returns True if the root block could be decoded.
"""
if self.boot != None:
# retrieve root block number from boot block
root_blk_num = self.boot.got_root_blk
# check root block number
if root_blk_num == 0:
new_root = self.blkdev.num_blocks / 2
self.log.msg(Log.INFO,"Boot contains not Root blk. Using default: %d" % new_root,root_blk_num)
root_blk_num = new_root
elif root_blk_num < self.blkdev.reserved or root_blk_num > self.blkdev.num_blocks:
new_root = self.blkdev.num_blocks / 2
self.log.msg(Log.INFO,"Invalid root block number: given %d using guess %d" % (root_blk_num, new_root),root_blk_num)
root_blk_num = new_root
else:
# guess root block number
root_blk_num = self.blkdev.num_blocks / 2
self.log.msg(Log.INFO,"Guessed root block number",root_blk_num)
# read root block
root = RootBlock(self.blkdev, root_blk_num)
root.read()
if not root.valid:
self.log.msg(Log.INFO,"Root block is not valid -> No file system",root_blk_num)
self.root = None # mode without root
return False
else:
self.root = root
return True
def read_block(self, blk_num, is_bm=False, is_bm_ext=False):
"""read block from device, decode it, and return block info instance"""
try:
# read block from device
if is_bm:
blk = BitmapBlock(self.blkdev, blk_num)
elif is_bm_ext:
blk = BitmapExtBlock(self.blkdev, blk_num)
else:
blk = Block(self.blkdev, blk_num)
blk.read()
data = blk.data
# create block info
bi = BlockInfo(blk_num)
# --- classify block ---
if blk.valid:
# block is valid AmigaDOS
bi.blk_status = self.BS_VALID
# --- bitmap block ---
if is_bm:
bi.blk_type = self.BT_BITMAP
bi.blk_status = self.BS_TYPE
bi.bitmap = blk.get_bitmap_data()
# --- bitmap ext block ---
elif is_bm_ext:
bi.blk_type = self.BT_BITMAP_EXT
bi.blk_status = self.BS_TYPE
bi.bitmap_ptrs = blk.bitmap_ptrs
bi.next_blk = blk.bitmap_ext_blk
# --- root block ---
elif blk.is_root_block():
bi.blk_type = self.BT_ROOT
bi.blk_status = self.BS_TYPE
root = RootBlock(self.blkdev, blk_num)
root.set(data)
bi.name = root.name
bi.hash_table = root.hash_table
bi.parent_blk = 0
self.log.msg(Log.DEBUG, "Found Root: '%s'" % bi.name,
blk_num)
# chech hash size
nht = len(root.hash_table)
if root.hash_size != nht:
self.log.msg(Log.ERROR,
"Root block hash table size mismatch",
blk_num)
eht = self.blkdev.block_longs - 56
if nht != eht:
self.log.msg(
Log.WARN,
"Root block does not have normal hash size: %d != %d"
% (nht, eht),
blk_num,
)
# --- user dir block ---
elif blk.is_user_dir_block():
bi.blk_type = self.BT_DIR
bi.blk_status = self.BS_TYPE
user = UserDirBlock(self.blkdev, blk_num,
DosType.is_longname(self.dos_type))
user.set(data)
bi.name = user.name
bi.parent_blk = user.parent
bi.next_blk = user.hash_chain
bi.hash_table = user.hash_table
bi.own_key = user.own_key
self.log.msg(Log.DEBUG, "Found Dir : '%s'" % bi.name,
blk_num)
# --- filter header block ---
elif blk.is_file_header_block():
bi.blk_type = self.BT_FILE_HDR
bi.blk_status = self.BS_TYPE
fh = FileHeaderBlock(self.blkdev, blk_num,
DosType.is_longname(self.dos_type))
fh.set(data)
bi.name = fh.name
bi.parent_blk = fh.parent
bi.next_blk = fh.hash_chain
bi.own_key = fh.own_key
bi.byte_size = fh.byte_size
bi.data_blocks = fh.data_blocks
bi.extension = fh.extension
self.log.msg(Log.DEBUG, "Found File: '%s'" % bi.name,
blk_num)
# --- file list block ---
elif blk.is_file_list_block():
bi.blk_type = self.BT_FILE_LIST
fl = FileListBlock(self.blkdev, blk_num)
fl.set(data)
bi.blk_status = self.BS_TYPE
bi.ext_blk = fl.extension
bi.blk_list = fl.data_blocks
bi.own_key = fl.own_key
bi.data_blocks = fl.data_blocks
bi.extension = fl.extension
bi.parent_blk = fl.parent
# --- file data block (OFS) ---
elif blk.is_file_data_block():
bi.blk_type = self.BT_FILE_DATA
bi.blk_status = self.BS_TYPE
fd = FileDataBlock(self.blkdev, blk_num)
fd.set(data)
bi.data_size = fd.data_size
bi.hdr_key = fd.hdr_key
bi.seq_num = fd.seq_num
elif blk.is_comment_block():
bi.blk_type = self.BT_COMMENT
bi.blk_status = self.BS_TYPE
cblk = CommentBlock(self.blkdev, blk_num)
bi.hdr_key = cblk.hdr_key
bi.own_key = cblk.own_key
except IOError as e:
self.log.msg(Log.ERROR, "Can't read block", blk_num)
bi = BlockInfo(blk_num)
bi.blk_status = BS_READ_ERROR
# sort block info into map and arrays assigned by status/type
self.block_map[blk_num] = bi
self.map_status[bi.blk_status].append(bi)
self.map_type[bi.blk_type].append(bi)
return bi
def read_block(self, blk_num, is_bm=False, is_bm_ext=False):
"""read block from device, decode it, and return block info instance"""
try:
# read block from device
if is_bm:
blk = BitmapBlock(self.blkdev, blk_num)
elif is_bm_ext:
blk = BitmapExtBlock(self.blkdev, blk_num)
else:
blk = Block(self.blkdev, blk_num)
blk.read()
data = blk.data
# create block info
bi = BlockInfo(blk_num)
# --- classify block ---
if blk.valid:
# block is valid AmigaDOS
bi.blk_status = self.BS_VALID
# --- bitmap block ---
if is_bm:
bi.blk_type = self.BT_BITMAP
bi.blk_status = self.BS_TYPE
bi.bitmap = blk.get_bitmap_data()
# --- bitmap ext block ---
elif is_bm_ext:
bi.blk_type = self.BT_BITMAP_EXT
bi.blk_status = self.BS_TYPE
bi.bitmap_ptrs = blk.bitmap_ptrs
bi.next_blk = blk.bitmap_ext_blk
# --- root block ---
elif blk.is_root_block():
bi.blk_type = self.BT_ROOT
bi.blk_status = self.BS_TYPE
root = RootBlock(self.blkdev, blk_num)
root.set(data)
bi.name = FSString(root.name)
bi.hash_table = root.hash_table
bi.parent_blk = 0
self.log.msg(Log.DEBUG, "Found Root: '%s'" % bi.name, blk_num)
# chech hash size
nht = len(root.hash_table)
if root.hash_size != nht:
self.log.msg(Log.ERROR, "Root block hash table size mismatch", blk_num)
eht = self.blkdev.block_longs - 56
if nht != eht:
self.log.msg(Log.WARN, "Root block does not have normal hash size: %d != %d" % (nht, eht), blk_num)
# --- user dir block ---
elif blk.is_user_dir_block():
bi.blk_type = self.BT_DIR
bi.blk_status = self.BS_TYPE
user = UserDirBlock(self.blkdev, blk_num)
user.set(data)
bi.name = FSString(user.name)
bi.parent_blk = user.parent
bi.next_blk = user.hash_chain
bi.hash_table = user.hash_table
bi.own_key = user.own_key
self.log.msg(Log.DEBUG, "Found Dir : '%s'" % bi.name, blk_num)
# --- filter header block ---
elif blk.is_file_header_block():
bi.blk_type = self.BT_FILE_HDR
bi.blk_status = self.BS_TYPE
fh = FileHeaderBlock(self.blkdev, blk_num)
fh.set(data)
bi.name = FSString(fh.name)
bi.parent_blk = fh.parent
bi.next_blk = fh.hash_chain
bi.own_key = fh.own_key
bi.byte_size = fh.byte_size
bi.data_blocks = fh.data_blocks
bi.extension = fh.extension
self.log.msg(Log.DEBUG, "Found File: '%s'" % bi.name, blk_num)
# --- file list block ---
elif blk.is_file_list_block():
bi.blk_type = self.BT_FILE_LIST
fl = FileListBlock(self.blkdev, blk_num)
fl.set(data)
bi.blk_status = self.BS_TYPE
bi.ext_blk = fl.extension
bi.blk_list = fl.data_blocks
bi.own_key = fl.own_key
bi.data_blocks = fl.data_blocks
bi.extension = fl.extension
bi.parent_blk = fl.parent
# --- file data block (OFS) ---
elif blk.is_file_data_block():
bi.blk_type = self.BT_FILE_DATA
bi.blk_status = self.BS_TYPE
fd = FileDataBlock(self.blkdev, blk_num)
fd.set(data)
bi.data_size = fd.data_size
bi.hdr_key = fd.hdr_key
bi.seq_num = fd.seq_num
except IOError,e:
self.log.msg(Log.ERROR, "Can't read block", blk_num)
bi = BlockInfo(blk_num)
bi.blk_status = BS_READ_ERROR
