mirror of
https://github.com/robmcmullen/atrcopy.git
synced 2024-11-29 11:51:14 +00:00
Moved file creation classes to utils.py
* prefer to pass around header than individual attributes so instances can get what they want
This commit is contained in:
Rob McMullen
parent
35c13bb9d5
commit
f84cea7170
@ -2,7 +2,7 @@ import numpy as np
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from errors import *
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from segments import SegmentData, EmptySegment, ObjSegment, RawSectorsSegment
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from utils import to_numpy
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from utils import *
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import logging
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log = logging.getLogger(__name__)
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@ -10,6 +10,7 @@ log = logging.getLogger(__name__)
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class BaseHeader(object):
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file_format = "generic" # text descriptor of file format
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sector_class = WriteableSector
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def __init__(self, sector_size=256, initial_sectors=0, vtoc_sector=0, starting_sector_label=0):
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self.image_size = 0
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@ -72,6 +73,8 @@ class BaseHeader(object):
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def strict_check(self, image):
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pass
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def create_sector(self, data):
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return self.sector_class(self.sector_size, data)
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@ -228,8 +231,8 @@ class DiskImageBase(object):
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return Directory
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@property
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def sector_list_class(self):
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return SectorList
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def sector_builder_class(self):
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return SectorBuilder
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def set_filename(self, filename):
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if "." in filename:
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@ -452,11 +455,11 @@ class DiskImageBase(object):
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"""
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state = self.begin_transaction()
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try:
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directory = self.directory_class(self.bytes_per_sector)
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directory = self.directory_class(self.header)
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self.get_directory(directory)
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dirent = directory.add_dirent(filename, filetype)
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data = to_numpy(data)
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sector_list = self.sector_list_class(self.bytes_per_sector, self.payload_bytes_per_sector, data, self.writeable_sector_class)
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sector_list = self.sector_builder_class(self.header, self.payload_bytes_per_sector, data, self.writeable_sector_class)
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vtoc_segments = self.get_vtoc_segments()
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vtoc = self.vtoc_class(self.bytes_per_sector, vtoc_segments)
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directory.save_dirent(self, dirent, vtoc, sector_list)
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@ -479,12 +482,12 @@ class DiskImageBase(object):
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def delete_file(self, filename):
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state = self.begin_transaction()
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try:
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directory = self.directory_class(self.bytes_per_sector)
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directory = self.directory_class(self.header)
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self.get_directory(directory)
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dirent = directory.find_dirent(filename)
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sector_list = dirent.get_sector_list(self)
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vtoc_segments = self.get_vtoc_segments()
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vtoc = self.vtoc_class(self.bytes_per_sector, vtoc_segments)
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vtoc = self.vtoc_class(self.header, vtoc_segments)
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directory.remove_dirent(self, dirent, vtoc, sector_list)
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self.write_sector_list(sector_list)
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self.write_sector_list(vtoc)
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@ -497,270 +500,6 @@ class DiskImageBase(object):
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self.get_metadata()
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class WriteableSector(object):
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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(object):
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def __init__(self, bytes_per_sector):
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self.bytes_per_sector = bytes_per_sector
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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 __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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def append(self, sector):
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self.sectors.append(sector)
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class Directory(BaseSectorList):
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def __init__(self, bytes_per_sector, num_dirents=-1, sector_class=WriteableSector):
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BaseSectorList.__init__(self, bytes_per_sector)
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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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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 = self.dirents.items()
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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 NoSpaceInDirectory()
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i += 1
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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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for dirent in self.dirents.values():
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if filename == dirent.get_filename():
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return dirent
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raise FileNotFound("%s not found on disk" % filename)
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def save_dirent(self, image, dirent, vtoc, sector_list):
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self.place_sector_list(dirent, vtoc, sector_list)
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dirent.update_sector_info(sector_list)
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self.calc_sectors(image)
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def place_sector_list(self, dirent, vtoc, 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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sector_list.calc_extra_sectors()
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num = len(sector_list)
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order = vtoc.reserve_space(num)
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if len(order) != num:
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raise 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 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 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 = 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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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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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.bytes_per_sector)
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def encode_empty(self):
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raise NotImplementedError
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def encode_dirent(self, dirent):
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raise NotImplementedError
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def store_encoded(self, data):
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while True:
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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 NotImplementedError
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class VTOC(BaseSectorList):
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def __init__(self, bytes_per_sector, segments=None):
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BaseSectorList.__init__(self, bytes_per_sector)
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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 parse_segments(self, segments):
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raise NotImplementedError
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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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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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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 NotEnoughSpaceOnDisk("No space left in VTOC")
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def calc_bitmap(self):
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raise 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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class SectorList(BaseSectorList):
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def __init__(self, bytes_per_sector, usable, data, sector_class):
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BaseSectorList.__init__(self, bytes_per_sector)
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self.data = to_numpy(data)
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self.usable_bytes = usable
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self.split_into_sectors(sector_class)
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self.file_length = -1
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def split_into_sectors(self, sector_class):
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index = 0
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while index < len(self.data):
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count = min(self.usable_bytes, len(self.data) - index)
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sector = sector_class(self.bytes_per_sector, self.data[index:index + count])
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self.sectors.append(sector)
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index += count
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def calc_extra_sectors(self):
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""" Add extra sectors to the list.
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For example, DOS 3.3 uses a track/sector list at the beginning of the
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file
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"""
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pass
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class BootDiskImage(DiskImageBase):
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def __str__(self):
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@ -1,7 +1,7 @@
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import numpy as np
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from errors import *
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from diskimages import BaseHeader, DiskImageBase, Directory, VTOC, WriteableSector, BaseSectorList
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from diskimages import BaseHeader, DiskImageBase, Directory, VTOC, WriteableSector, BaseSectorList, SectorBuilder
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from segments import DefaultSegment, EmptySegment, ObjSegment, RawTrackSectorSegment, SegmentSaver
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import logging
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@ -232,16 +232,16 @@ class Dos33Dirent(object):
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self.sector_map = sector_list
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def get_sector_list(self, image):
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sector_list = BaseSectorList(image.bytes_per_sector)
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sector_list = BaseSectorList(image.header.bytes_per_sector)
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self.start_read(image)
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sector_num = image.header.sector_from_track(self.track, self.sector)
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while sector_num > 0:
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sector = WriteableSector(image.bytes_per_sector, None, sector_num)
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sector = WriteableSector(image.header.bytes_per_sector, None, sector_num)
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sector_list.append(sector)
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values, style = image.get_sectors(sector_num)
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sector = image.header.sector_from_track(values[1], values[2])
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for sector_num in sector_list:
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sector = WriteableSector(image.bytes_per_sector, None, sector_num)
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sector = WriteableSector(image.header.bytes_per_sector, None, sector_num)
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sector_list.append(sector)
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return sector_list
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@ -279,6 +279,14 @@ class Dos33Dirent(object):
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self.deleted = False
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class Dos33SectorBuilder(SectorBuilder):
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def calc_extra_sectors(self):
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"""Add track/sector list
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"""
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for ts_group_start in range(0, len(self), self.header.ts_pairs):
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print ts_group_start
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class Dos33Header(BaseHeader):
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file_format = "DOS 3.3"
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@ -331,6 +339,10 @@ class Dos33DiskImage(DiskImageBase):
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def raw_sector_class(self):
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return RawTrackSectorSegment
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@property
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def sector_builder_class(self):
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return Dos33SectorBuilder
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def get_boot_sector_info(self):
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# based on logic from a2server
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data, style = self.get_sectors(0)
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@ -370,12 +382,13 @@ class Dos33DiskImage(DiskImageBase):
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def get_vtoc(self):
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data, style = self.get_sectors(self.header.first_vtoc)
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values = data[0:self.vtoc_type.itemsize].view(dtype=self.vtoc_type)[0]
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self.first_directory = self.header.sector_from_track(values['cat_track'], values['cat_sector'])
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self.sector_size = int(values['bytes_per_sector'])
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self.max_sectors = int(values['num_tracks']) * int(values['sectors_per_track'])
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self.dos_release = values['dos_release']
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self.last_track_num = values['last_track']
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self.track_alloc_dir = values['track_dir']
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self.header.first_directory = self.header.sector_from_track(values['cat_track'], values['cat_sector'])
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self.header.sector_size = int(values['bytes_per_sector'])
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self.header.max_sectors = int(values['num_tracks']) * int(values['sectors_per_track'])
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self.header.ts_pairs = int(values['max_pairs'])
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self.header.dos_release = values['dos_release']
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self.header.last_track_num = values['last_track']
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self.header.track_alloc_dir = values['track_dir']
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self.assert_valid_sector(self.first_directory)
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def get_directory(self, directory=None):
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267
atrcopy/utils.py
267
atrcopy/utils.py
@ -17,3 +17,270 @@ 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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class WriteableSector(object):
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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
|
||||
self.used += count
|
||||
return data[count:]
|
||||
|
||||
|
||||
class BaseSectorList(object):
|
||||
def __init__(self, bytes_per_sector):
|
||||
self.bytes_per_sector = bytes_per_sector
|
||||
self.sectors = []
|
||||
|
||||
def __len__(self):
|
||||
return len(self.sectors)
|
||||
|
||||
def __getitem__(self, index):
|
||||
if index < 0 or index >= len(self):
|
||||
raise IndexError
|
||||
return self.sectors[index]
|
||||
|
||||
@property
|
||||
def num_sectors(self):
|
||||
return len(self.sectors)
|
||||
|
||||
@property
|
||||
def first_sector(self):
|
||||
if self.sectors:
|
||||
return self.sectors[0].sector_num
|
||||
return -1
|
||||
|
||||
def append(self, sector):
|
||||
self.sectors.append(sector)
|
||||
|
||||
|
||||
class Directory(BaseSectorList):
|
||||
def __init__(self, header, num_dirents=-1, sector_class=WriteableSector):
|
||||
BaseSectorList.__init__(self, header.bytes_per_sector)
|
||||
self.sector_class = sector_class
|
||||
self.num_dirents = num_dirents
|
||||
# number of dirents may be unlimited, so use a dict instead of a list
|
||||
self.dirents = {}
|
||||
|
||||
def set(self, index, dirent):
|
||||
self.dirents[index] = dirent
|
||||
log.debug("set dirent #%d: %s" % (index, dirent))
|
||||
|
||||
def get_free_dirent(self):
|
||||
used = set()
|
||||
d = self.dirents.items()
|
||||
d.sort()
|
||||
for i, dirent in d:
|
||||
if not dirent.in_use:
|
||||
return i
|
||||
used.add(i)
|
||||
if self.num_dirents > 0 and (len(used) >= self.num_dirents):
|
||||
raise NoSpaceInDirectory()
|
||||
i += 1
|
||||
used.add(i)
|
||||
return i
|
||||
|
||||
def add_dirent(self, filename, filetype):
|
||||
index = self.get_free_dirent()
|
||||
dirent = self.dirent_class(None)
|
||||
dirent.set_values(filename, filetype, index)
|
||||
self.set(index, dirent)
|
||||
return dirent
|
||||
|
||||
def find_dirent(self, filename):
|
||||
for dirent in self.dirents.values():
|
||||
if filename == dirent.get_filename():
|
||||
return dirent
|
||||
raise FileNotFound("%s not found on disk" % filename)
|
||||
|
||||
def save_dirent(self, image, dirent, vtoc, sector_list):
|
||||
self.place_sector_list(dirent, vtoc, sector_list)
|
||||
dirent.update_sector_info(sector_list)
|
||||
self.calc_sectors(image)
|
||||
|
||||
def place_sector_list(self, dirent, vtoc, sector_list):
|
||||
""" Map out the sectors and link the sectors together
|
||||
|
||||
raises NotEnoughSpaceOnDisk if the whole file won't fit. It will not
|
||||
allow partial writes.
|
||||
"""
|
||||
sector_list.calc_extra_sectors()
|
||||
num = len(sector_list)
|
||||
order = vtoc.reserve_space(num)
|
||||
if len(order) != num:
|
||||
raise InvalidFile("VTOC reserved space for %d sectors. Sectors needed: %d" % (len(order), num))
|
||||
file_length = 0
|
||||
last_sector = None
|
||||
for sector, sector_num in zip(sector_list.sectors, order):
|
||||
sector.sector_num = sector_num
|
||||
sector.file_num = dirent.file_num
|
||||
file_length += sector.used
|
||||
if last_sector is not None:
|
||||
last_sector.next_sector_num = sector_num
|
||||
last_sector = sector
|
||||
if last_sector is not None:
|
||||
last_sector.next_sector_num = 0
|
||||
sector_list.file_length = file_length
|
||||
|
||||
def remove_dirent(self, image, dirent, vtoc, sector_list):
|
||||
vtoc.free_sector_list(sector_list)
|
||||
dirent.mark_deleted()
|
||||
self.calc_sectors(image)
|
||||
|
||||
@property
|
||||
def dirent_class(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def calc_sectors(self, image):
|
||||
self.sectors = []
|
||||
self.current_sector = self.get_dirent_sector()
|
||||
self.encode_index = 0
|
||||
|
||||
d = self.dirents.items()
|
||||
d.sort()
|
||||
# there may be gaps, so fill in missing entries with blanks
|
||||
current = 0
|
||||
for index, dirent in d:
|
||||
for missing in range(current, index):
|
||||
log.debug("Encoding empty dirent at %d" % missing)
|
||||
data = self.encode_empty()
|
||||
self.store_encoded(data)
|
||||
log.debug("Encoding dirent: %s" % dirent)
|
||||
data = self.encode_dirent(dirent)
|
||||
self.store_encoded(data)
|
||||
current = index + 1
|
||||
self.finish_encoding(image)
|
||||
|
||||
def get_dirent_sector(self):
|
||||
return self.sector_class(self.bytes_per_sector)
|
||||
|
||||
def encode_empty(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def encode_dirent(self, dirent):
|
||||
raise NotImplementedError
|
||||
|
||||
def store_encoded(self, data):
|
||||
while True:
|
||||
log.debug("store_encoded: %d bytes in %s" % (len(data), self.current_sector))
|
||||
data = self.current_sector.add_data(data)
|
||||
if len(data) > 0:
|
||||
self.sectors.append(self.current_sector)
|
||||
self.current_sector = self.get_dirent_sector()
|
||||
else:
|
||||
break
|
||||
|
||||
def finish_encoding(self, image):
|
||||
if not self.current_sector.is_empty:
|
||||
self.sectors.append(self.current_sector)
|
||||
self.set_sector_numbers(image)
|
||||
|
||||
def set_sector_numbers(self, image):
|
||||
raise NotImplementedError
|
||||
|
||||
|
||||
class VTOC(BaseSectorList):
|
||||
def __init__(self, header, segments=None):
|
||||
BaseSectorList.__init__(self, header.bytes_per_sector)
|
||||
|
||||
# sector map: 1 is free, 0 is allocated
|
||||
self.sector_map = np.zeros([1280], dtype=np.uint8)
|
||||
if segments is not None:
|
||||
self.parse_segments(segments)
|
||||
|
||||
def parse_segments(self, segments):
|
||||
raise NotImplementedError
|
||||
|
||||
def reserve_space(self, num):
|
||||
order = []
|
||||
for i in range(num):
|
||||
order.append(self.get_next_free_sector())
|
||||
log.debug("Sectors reserved: %s" % order)
|
||||
self.calc_bitmap()
|
||||
return order
|
||||
|
||||
def get_next_free_sector(self):
|
||||
free = np.nonzero(self.sector_map)[0]
|
||||
if len(free) > 0:
|
||||
num = free[0]
|
||||
log.debug("Found sector %d free" % num)
|
||||
self.sector_map[num] = 0
|
||||
return num
|
||||
raise NotEnoughSpaceOnDisk("No space left in VTOC")
|
||||
|
||||
def calc_bitmap(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def free_sector_list(self, sector_list):
|
||||
for sector in sector_list:
|
||||
self.sector_map[sector.sector_num] = 1
|
||||
|
||||
|
||||
class SectorBuilder(BaseSectorList):
|
||||
def __init__(self, header, usable, data, sector_class):
|
||||
BaseSectorList.__init__(self, header.bytes_per_sector)
|
||||
self.data = to_numpy(data)
|
||||
self.usable_bytes = usable
|
||||
self.split_into_sectors(header)
|
||||
self.file_length = -1
|
||||
|
||||
def split_into_sectors(self, header):
|
||||
index = 0
|
||||
while index < len(self.data):
|
||||
count = min(self.usable_bytes, len(self.data) - index)
|
||||
sector = header.create_sector(self.data[index:index + count])
|
||||
self.sectors.append(sector)
|
||||
index += count
|
||||
|
||||
|
||||
def calc_extra_sectors(self):
|
||||
""" Add extra sectors to the list.
|
||||
|
||||
For example, DOS 3.3 uses a track/sector list at the beginning
|
||||
of the file
|
||||
|
||||
Sectors will have their sector assignments when this function is
|
||||
called.
|
||||
"""
|
||||
pass
|
||||
|
||||
Loading…
Reference in New Issue
Block a user