369 lines
11 KiB
Python
369 lines
11 KiB
Python
import types
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import uuid as stdlib_uuid
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import numpy as np
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from . import errors
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import logging
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log = logging.getLogger(__name__)
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try: # Expensive debugging
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_xd = _expensive_debugging
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except NameError:
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_xd = False
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def uuid():
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u = stdlib_uuid.uuid4()
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# Force it to use unicode(py2) or str(py3) so it isn't serialized as
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# future.types.newstr.newstr on py2
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try:
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u = unicode(u)
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except:
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u = str(u)
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return u
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def to_numpy(value):
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if type(value) is np.ndarray:
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return value
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elif type(value) is bytes:
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return np.copy(np.frombuffer(value, dtype=np.uint8))
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elif type(value) is list:
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return np.asarray(value, dtype=np.uint8)
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raise TypeError("Can't convert to numpy data")
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def to_numpy_list(value):
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if type(value) is np.ndarray:
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return value
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return np.asarray(value, dtype=np.uint32)
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def text_to_int(text, default_base="hex"):
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""" Convert text to int, raising exeception on invalid input
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"""
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if text.startswith("0x"):
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value = int(text[2:], 16)
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elif text.startswith("$"):
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value = int(text[1:], 16)
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elif text.startswith("#"):
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value = int(text[1:], 10)
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elif text.startswith("%"):
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value = int(text[1:], 2)
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else:
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if default_base == "dec":
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value = int(text)
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else:
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value = int(text, 16)
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return value
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class WriteableSector:
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def __init__(self, sector_size, data=None, num=-1):
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self._sector_num = num
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self._next_sector = 0
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self.sector_size = sector_size
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self.file_num = 0
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self.data = np.zeros([sector_size], dtype=np.uint8)
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self.used = 0
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self.ptr = self.used
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if data is not None:
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self.add_data(data)
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def __str__(self):
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return "sector=%d next=%d size=%d used=%d" % (self._sector_num, self._next_sector, self.sector_size, self.used)
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@property
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def sector_num(self):
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return self._sector_num
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@sector_num.setter
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def sector_num(self, value):
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self._sector_num = value
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@property
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def next_sector_num(self):
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return self._next_sector_num
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@sector_num.setter
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def next_sector_num(self, value):
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self._next_sector_num = value
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@property
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def space_remaining(self):
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return self.sector_size - self.ptr
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@property
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def is_empty(self):
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return self.ptr == 0
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def add_data(self, data):
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count = len(data)
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if self.ptr + count > self.sector_size:
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count = self.space_remaining
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self.data[self.ptr:self.ptr + count] = data[0:count]
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self.ptr += count
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self.used += count
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return data[count:]
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class BaseSectorList:
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def __init__(self, header):
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self.header = header
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self.sector_size = header.sector_size
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self.sectors = []
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def __len__(self):
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return len(self.sectors)
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def __str__(self):
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return "\n".join(" %d: %s" % (i, str(s)) for i, s in enumerate(self))
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def __getitem__(self, index):
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if index < 0 or index >= len(self):
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raise IndexError
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return self.sectors[index]
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@property
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def num_sectors(self):
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return len(self.sectors)
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@property
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def first_sector(self):
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if self.sectors:
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return self.sectors[0].sector_num
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return -1
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@property
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def bytes_used(self):
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size = 0
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for s in self:
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size += s.used
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return size
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def append(self, sector):
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self.sectors.append(sector)
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def extend(self, sectors):
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self.sectors.extend(sectors)
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class Dirent:
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"""Abstract base class for a directory entry
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"""
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def __init__(self, file_num=0):
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self.file_num = file_num
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def __eq__(self, other):
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raise errors.NotImplementedError
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def extra_metadata(self, image):
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raise errors.NotImplementedError
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def mark_deleted(self):
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raise errors.NotImplementedError
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def parse_raw_dirent(self, image, bytes):
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raise errors.NotImplementedError
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def encode_dirent(self):
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raise errors.NotImplementedError
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def get_sectors_in_vtoc(self, image):
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raise errors.NotImplementedError
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def start_read(self, image):
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raise errors.NotImplementedError
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def read_sector(self, image):
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raise errors.NotImplementedError
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class Directory(BaseSectorList):
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def __init__(self, header, num_dirents=-1, sector_class=WriteableSector):
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BaseSectorList.__init__(self, header)
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self.sector_class = sector_class
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self.num_dirents = num_dirents
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# number of dirents may be unlimited, so use a dict instead of a list
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self.dirents = {}
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def set(self, index, dirent):
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self.dirents[index] = dirent
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if _xd: log.debug("set dirent #%d: %s" % (index, dirent))
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def get_free_dirent(self):
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used = set()
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d = list(self.dirents.items())
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if d:
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d.sort()
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for i, dirent in d:
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if not dirent.in_use:
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return i
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used.add(i)
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if self.num_dirents > 0 and (len(used) >= self.num_dirents):
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raise errors.NoSpaceInDirectory()
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i += 1
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else:
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i = 0
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used.add(i)
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return i
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def add_dirent(self, filename, filetype):
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index = self.get_free_dirent()
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dirent = self.dirent_class(None)
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dirent.set_values(filename, filetype, index)
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self.set(index, dirent)
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return dirent
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def find_dirent(self, filename):
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if hasattr(filename, "filename"):
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# we've been passed a dirent instead of a filename
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for dirent in list(self.dirents.values()):
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if dirent == filename:
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return dirent
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else:
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for dirent in list(self.dirents.values()):
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if filename == dirent.filename:
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return dirent
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raise errors.FileNotFound("%s not found on disk" % filename)
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def save_dirent(self, image, dirent, vtoc, sector_list):
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vtoc.assign_sector_numbers(dirent, sector_list)
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dirent.add_metadata_sectors(vtoc, sector_list, image.header)
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dirent.update_sector_info(sector_list)
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self.calc_sectors(image)
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def remove_dirent(self, image, dirent, vtoc, sector_list):
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vtoc.free_sector_list(sector_list)
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dirent.mark_deleted()
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self.calc_sectors(image)
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@property
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def dirent_class(self):
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raise errors.NotImplementedError
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def calc_sectors(self, image):
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self.sectors = []
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self.current_sector = self.get_dirent_sector()
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self.encode_index = 0
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d = list(self.dirents.items())
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d.sort()
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# there may be gaps, so fill in missing entries with blanks
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current = 0
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for index, dirent in d:
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for missing in range(current, index):
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if _xd: log.debug("Encoding empty dirent at %d" % missing)
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data = self.encode_empty()
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self.store_encoded(data)
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if _xd: log.debug("Encoding dirent: %s" % dirent)
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data = self.encode_dirent(dirent)
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self.store_encoded(data)
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current = index + 1
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self.finish_encoding(image)
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def get_dirent_sector(self):
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return self.sector_class(self.sector_size)
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def encode_empty(self):
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raise errors.NotImplementedError
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def encode_dirent(self, dirent):
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raise errors.NotImplementedError
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def store_encoded(self, data):
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while True:
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if _xd: log.debug("store_encoded: %d bytes in %s" % (len(data), self.current_sector))
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data = self.current_sector.add_data(data)
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if len(data) > 0:
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self.sectors.append(self.current_sector)
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self.current_sector = self.get_dirent_sector()
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else:
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break
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def finish_encoding(self, image):
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if not self.current_sector.is_empty:
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self.sectors.append(self.current_sector)
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self.set_sector_numbers(image)
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def set_sector_numbers(self, image):
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raise errors.NotImplementedError
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class VTOC(BaseSectorList):
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def __init__(self, header, segments=None):
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BaseSectorList.__init__(self, header)
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# sector map: 1 is free, 0 is allocated
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self.sector_map = np.zeros([1280], dtype=np.uint8)
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if segments is not None:
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self.parse_segments(segments)
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def __str__(self):
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return "%s\n (%d free)" % ("\n".join(["track %02d: %s" % (i, line) for i, line in enumerate(str(self.sector_map[self.header.starting_sector_label:(self.header.tracks_per_disk*self.header.sectors_per_track) + self.header.starting_sector_label].reshape([self.header.tracks_per_disk,self.header.sectors_per_track])).splitlines())]), self.num_free_sectors)
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@property
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def num_free_sectors(self):
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free = np.where(self.sector_map == 1)[0]
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return len(free)
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def iter_free_sectors(self):
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for i, pos, size in self.header.iter_sectors():
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if self.sector_map[i] == 1:
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yield i, pos, size
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def parse_segments(self, segments):
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raise errors.NotImplementedError
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def assign_sector_numbers(self, dirent, sector_list):
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""" Map out the sectors and link the sectors together
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raises NotEnoughSpaceOnDisk if the whole file won't fit. It will not
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allow partial writes.
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"""
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num = len(sector_list)
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order = self.reserve_space(num)
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if len(order) != num:
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raise errors.InvalidFile("VTOC reserved space for %d sectors. Sectors needed: %d" % (len(order), num))
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file_length = 0
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last_sector = None
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for sector, sector_num in zip(sector_list.sectors, order):
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sector.sector_num = sector_num
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sector.file_num = dirent.file_num
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file_length += sector.used
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if last_sector is not None:
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last_sector.next_sector_num = sector_num
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last_sector = sector
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if last_sector is not None:
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last_sector.next_sector_num = 0
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sector_list.file_length = file_length
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def reserve_space(self, num):
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order = []
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for i in range(num):
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order.append(self.get_next_free_sector())
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if _xd: log.debug("Sectors reserved: %s" % order)
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self.calc_bitmap()
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return order
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def get_next_free_sector(self):
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free = np.nonzero(self.sector_map)[0]
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if len(free) > 0:
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num = free[0]
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if _xd: log.debug("Found sector %d free" % num)
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self.sector_map[num] = 0
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return num
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raise errors.NotEnoughSpaceOnDisk("No space left in VTOC")
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def calc_bitmap(self):
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raise errors.NotImplementedError
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def free_sector_list(self, sector_list):
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for sector in sector_list:
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self.sector_map[sector.sector_num] = 1
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self.calc_bitmap()
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