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https://github.com/robmcmullen/atrcopy.git
synced 2024-11-26 08:49:50 +00:00
Added BaseHeader for superclass
This commit is contained in:
Rob McMullen
parent
04edbed853
commit
35c13bb9d5
@ -8,7 +8,74 @@ import logging
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log = logging.getLogger(__name__)
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class AtrHeader(object):
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class BaseHeader(object):
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file_format = "generic" # text descriptor of file format
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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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self.sector_size = sector_size
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self.initial_sector_size = 0
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self.num_initial_sectors = 0
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self.crc = 0
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self.unused = 0
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self.flags = 0
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self.header_offset = 0
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self.starting_sector_label = starting_sector_label
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self.max_sectors = 0 # number of sectors, -1 is unlimited
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self.tracks_per_disk = 0
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self.sectors_per_track = 0
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self.first_vtoc = vtoc_sector
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self.num_vtoc = 1
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self.extra_vtoc = []
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self.first_directory = 0
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self.num_directory = 0
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def __len__(self):
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return self.header_offset
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def to_array(self):
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header_bytes = np.zeros([self.header_offset], dtype=np.uint8)
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self.encode(header_bytes)
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return header_bytes
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def encode(self, header_bytes):
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"""Subclasses should override this to put the byte values into the
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header.
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"""
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return
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def sector_is_valid(self, sector):
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return (self.max_sectors < 0) | (sector >= self.starting_sector_label and sector < (self.max_sectors + self.starting_sector_label))
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def get_pos(self, sector):
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"""Get index (into the raw data of the disk image) of start of sector
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This base class method assumes the sectors are one after another, in
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order starting from the beginning of the raw data.
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"""
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if not self.sector_is_valid(sector):
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raise ByteNotInFile166("Sector %d out of range" % sector)
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pos = sector * self.sector_size + self.header_offset
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size = self.sector_size
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return pos, size
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def sector_from_track(self, track, sector):
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return (track * self.sectors_per_track) + sector
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def track_from_sector(self, sector):
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track, sector = divmod(sector, self.sectors_per_track)
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return track, sector
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def check_size(self, size):
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raise InvalidDiskImage("BaseHeader subclasses need custom checks for size")
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def strict_check(self, image):
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pass
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class AtrHeader(BaseHeader):
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# ATR Format described in http://www.atarimax.com/jindroush.atari.org/afmtatr.html
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format = np.dtype([
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('wMagic', '<u2'),
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@ -22,16 +89,7 @@ class AtrHeader(object):
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file_format = "ATR"
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def __init__(self, bytes=None, sector_size=128, initial_sectors=3, create=False):
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self.image_size = 0
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self.sector_size = sector_size
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self.crc = 0
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self.unused = 0
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self.flags = 0
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self.header_offset = 0
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self.starting_sector_label = 1
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self.initial_sector_size = sector_size
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self.num_initial_sectors = initial_sectors
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self.max_sectors = 0
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BaseHeader.__init__(self, sector_size, initial_sectors, 360)
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if create:
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self.header_offset = 16
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self.check_size(0)
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@ -54,11 +112,7 @@ class AtrHeader(object):
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def __str__(self):
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return "%s Disk Image (size=%d (%dx%db), crc=%d flags=%d unused=%d)" % (self.file_format, self.image_size, self.max_sectors, self.sector_size, self.crc, self.flags, self.unused)
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def __len__(self):
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return self.header_offset
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def to_array(self):
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raw = np.zeros([16], dtype=np.uint8)
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def encode(self, raw):
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values = raw.view(dtype=self.format)[0]
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values[0] = 0x296
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paragraphs = self.image_size / 16
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@ -89,14 +143,14 @@ class AtrHeader(object):
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self.num_initial_sectors = 3
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else:
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self.image_size = size
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self.first_vtoc = 360
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self.num_vtoc = 1
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self.first_directory = 361
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self.num_directory = 8
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self.tracks_per_disk = 40
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self.sectors_per_track = 18
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initial_bytes = self.initial_sector_size * self.num_initial_sectors
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self.max_sectors = ((self.image_size - initial_bytes) / self.sector_size) + self.num_initial_sectors
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def strict_check(self, image):
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pass
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def sector_is_valid(self, sector):
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return sector > 0 and sector <= self.max_sectors
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def get_pos(self, sector):
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if not self.sector_is_valid(sector):
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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 AtrHeader, DiskImageBase, Directory, VTOC, WriteableSector, BaseSectorList
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from diskimages import BaseHeader, DiskImageBase, Directory, VTOC, WriteableSector, BaseSectorList
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from segments import DefaultSegment, EmptySegment, ObjSegment, RawTrackSectorSegment, SegmentSaver
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import logging
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@ -279,59 +279,30 @@ class Dos33Dirent(object):
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self.deleted = False
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class Dos33Header(AtrHeader):
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class Dos33Header(BaseHeader):
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file_format = "DOS 3.3"
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def __init__(self):
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AtrHeader.__init__(self, None, 256, 0)
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self.starting_sector_label = 0
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self.header_offset = 0
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self.sector_order = range(16)
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self.vtoc_sector = 17 * 16
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self.tracks_per_disk = 0
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self.sectors_per_track = 0
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self.max_sectors = -1
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BaseHeader.__init__(self, 256)
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def __str__(self):
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return "%s Disk Image (size=%d (%dx%db)" % (self.file_format, self.image_size, self.max_sectors, self.sector_size)
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def __len__(self):
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return 0
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def to_array(self):
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raw = np.zeros([0], dtype=np.uint8)
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return raw
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def check_size(self, size):
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AtrHeader.check_size(self, size)
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if size != 143360:
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raise InvalidDiskImage("Incorrect size for DOS 3.3 image")
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self.first_vtoc = 17 * 16
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self.num_vtoc = 1
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self.first_directory = self.first_vtoc + 15
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self.num_directory = 8
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self.tracks_per_disk = 35
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self.sectors_per_track = 16
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self.max_sectors = self.tracks_per_disk * self.sectors_per_track
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def sector_is_valid(self, sector):
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# DOS 3.3 sectors count from 0
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return (self.max_sectors < 0) | (sector >= 0 and sector < self.max_sectors)
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def get_pos(self, sector):
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if not self.sector_is_valid(sector):
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raise ByteNotInFile166("Sector %d out of range" % sector)
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pos = sector * self.sector_size
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size = self.sector_size
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return pos, size
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def sector_from_track(self, track, sector):
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return track * 16 + sector
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def track_from_sector(self, sector):
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track, sector = divmod(sector, 16)
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return track, sector
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class Dos33DiskImage(DiskImageBase):
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def __init__(self, rawdata, filename=""):
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self.first_catalog = 0
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self.first_directory = 0
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DiskImageBase.__init__(self, rawdata, filename)
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def __str__(self):
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@ -367,10 +338,10 @@ class Dos33DiskImage(DiskImageBase):
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if (magic == [1, 56, 176, 3]).all():
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raise InvalidDiskImage("ProDOS format found; not DOS 3.3 image")
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swap_order = False
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data, style = self.get_sectors(self.header.vtoc_sector)
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data, style = self.get_sectors(self.header.first_vtoc)
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if data[3] == 3:
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if data[1] < 35 and data[2] < 16:
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data, style = self.get_sectors(self.header.vtoc_sector + 14)
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data, style = self.get_sectors(self.header.first_vtoc + 14)
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if data[2] != 13:
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swap_order = True
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else:
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@ -397,17 +368,18 @@ class Dos33DiskImage(DiskImageBase):
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])
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def get_vtoc(self):
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data, style = self.get_sectors(self.header.vtoc_sector)
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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_catalog = self.header.sector_from_track(values[1], values[2])
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self.assert_valid_sector(self.first_catalog)
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self.total_sectors = int(values['num_tracks']) * int(values['sectors_per_track'])
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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.assert_valid_sector(self.first_directory)
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def get_directory(self, directory=None):
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sector = self.first_catalog
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sector = self.first_directory
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num = 0
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files = []
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while sector > 0:
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@ -451,8 +423,8 @@ class Dos33DiskImage(DiskImageBase):
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r = self.rawdata
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segments = []
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addr = 0
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start, count = self.get_contiguous_sectors(self.header.vtoc_sector, 1)
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segment = RawTrackSectorSegment(r[start:start+count], self.header.vtoc_sector, 1, count, 0, 0, self.header.sector_size, name="VTOC")
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start, count = self.get_contiguous_sectors(self.header.first_vtoc, 1)
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segment = RawTrackSectorSegment(r[start:start+count], self.header.first_vtoc, 1, count, 0, 0, self.header.sector_size, name="VTOC")
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segments.append(segment)
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return segments
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@ -460,7 +432,7 @@ class Dos33DiskImage(DiskImageBase):
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byte_order = []
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r = self.rawdata
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segments = []
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sector = self.first_catalog
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sector = self.first_directory
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while sector > 0:
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self.assert_valid_sector(sector)
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print "reading catalog sector", sector
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@ -474,7 +446,7 @@ class Dos33DiskImage(DiskImageBase):
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def get_next_directory_sector(self, sector):
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if sector == -1:
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sector = self.first_catalog
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sector = self.first_directory
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print "reading catalog sector", sector
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self.assert_valid_sector(sector)
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raw, _, _ = self.get_raw_bytes(sector)
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