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https://github.com/robmcmullen/atrcopy.git
synced 2024-11-29 11:51:14 +00:00
Initial support for multiple types of disk images
* added KBoot image detection * created base class for disk images
This commit is contained in:
Rob McMullen
parent
4093077e3c
commit
5ed7afc9c3
150
atrcopy.py
150
atrcopy.py
@ -14,6 +14,9 @@ class AtrError(RuntimeError):
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class InvalidAtrHeader(AtrError):
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pass
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class InvalidDiskImage(AtrError):
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pass
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class LastDirent(AtrError):
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pass
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@ -81,6 +84,9 @@ class AtrHeader(object):
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self.sector_size = 256
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self.initial_sector_size = 128
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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.sector_size = 128
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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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@ -413,14 +419,11 @@ class AtrFileSegment(ObjSegment):
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s += " " + self.error
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return s
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class AtrDiskImage(object):
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class DiskImageBase(object):
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def __init__(self, bytes):
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self.bytes = to_numpy(bytes)
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self.header = None
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self.first_vtoc = 360
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self.num_vtoc = 1
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self.vtoc2 = 0
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self.first_data_after_vtoc = 369
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self.total_sectors = 0
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self.unused_sectors = 0
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self.files = []
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@ -428,27 +431,10 @@ class AtrDiskImage(object):
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self.all_sane = True
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self.setup()
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def __str__(self):
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if self.all_sane:
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return "%s %d usable sectors (%d free), %d files" % (self.header, self.total_sectors, self.unused_sectors, len(self.files))
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else:
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return "%s bad directory entries; possible boot disk? Use -f option to try to extract anyway" % self.header
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def dir(self):
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lines = []
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lines.append(str(self))
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for dirent in self.files:
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if dirent.in_use:
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lines.append(str(dirent))
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return "\n".join(lines)
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def setup(self):
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self.size = len(self.bytes)
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self.size = np.alen(self.bytes)
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self.read_atr_header()
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self.check_size()
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self.get_vtoc()
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self.get_directory()
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def read_atr_header(self):
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bytes = self.bytes[0:16]
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@ -480,6 +466,47 @@ class AtrDiskImage(object):
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size += more
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return self.bytes[pos:pos + size]
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def get_contiguous_sectors(self, sector, num):
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start = 0
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count = 0
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for index in range(sector, sector + num):
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pos, size = self.header.get_pos(index)
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if start == 0:
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start = pos
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count += size
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return start, count
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class AtariDosDiskImage(DiskImageBase):
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def __init__(self, bytes):
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self.first_vtoc = 360
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self.num_vtoc = 1
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self.vtoc2 = 0
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self.first_data_after_vtoc = 369
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DiskImageBase.__init__(self, bytes)
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def __str__(self):
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if self.all_sane:
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return "%s Atari DOS Format: %d usable sectors (%d free), %d files" % (self.header, self.total_sectors, self.unused_sectors, len(self.files))
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else:
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return "%s bad directory entries; possible boot disk? Use -f option to try to extract anyway" % self.header
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def dir(self):
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lines = []
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lines.append(str(self))
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for dirent in self.files:
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if dirent.in_use:
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lines.append(str(dirent))
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return "\n".join(lines)
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def setup(self):
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self.size = np.alen(self.bytes)
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self.read_atr_header()
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self.check_size()
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self.get_vtoc()
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self.get_directory()
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vtoc_type = np.dtype([
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('code', 'u1'),
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('total','<u2'),
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@ -533,16 +560,6 @@ class AtrDiskImage(object):
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return self.get_file(dirent)
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return ""
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def get_contiguous_sectors(self, sector, num):
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start = 0
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count = 0
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for index in range(sector, sector + num):
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pos, size = self.header.get_pos(index)
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if start == 0:
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start = pos
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count += size
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return start, count
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def get_obj_segment(self, metadata_start, data_start, start_addr, end_addr, data, name):
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"""Subclass use: override this method to create a custom segment.
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@ -642,19 +659,36 @@ class AtrDiskImage(object):
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self.segments.extend(self.get_vtoc_segments())
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self.segments.extend(self.get_directory_segments())
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self.segments.extend(self.get_file_segments())
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# for dirent in self.atr.files:
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# try:
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# bytes = self.get_file(dirent)
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# error = None
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# except atrcopy.FileNumberMismatchError164:
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# bytes = None
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# error = "Error 164"
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# except atrcopy.ByteNotInFile166:
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# bytes = None
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# error = "Invalid sector"
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# a = AtrFileSegment(dirent, bytes, error)
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# self.segments.append(AtrSegment(dirent))
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class KBootImage(DiskImageBase):
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def __init__(self, bytes):
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self.exe_start = 0
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self.exe_size = 0
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DiskImageBase.__init__(self, bytes)
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def __str__(self):
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return "%s KBoot Format: %d byte executable" % (self.header, self.exe_size)
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def check_size(self):
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self.header.check_size(self.size)
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start, size = self.header.get_pos(4)
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i = self.header.atr_header_offset + 9
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count = self.bytes[i] + 256 * self.bytes[i+1] + 256 * 256 *self.bytes[i + 2]
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if start + count > self.size or start + count < self.size - 128:
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raise InvalidDiskImage("Doesn't seem to be KBoot header")
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self.exe_size = count
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self.exe_start = start
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def get_file_segment(self):
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return ObjSegment(0, 0, 0, self.exe_start, self.bytes[self.exe_start:self.exe_start + self.exe_size], name="KBoot Executable")
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def parse_segments(self):
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if self.header.image_size > 0:
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self.segments.append(ObjSegment(0, 0, 0, self.header.atr_header_offset, self.bytes[0:self.header.atr_header_offset], name="%s Header" % self.header.file_format))
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self.segments.append(RawSectorsSegment(1, self.header.max_sectors, self.header.image_size, self.bytes[self.header.atr_header_offset:], name="Raw disk sectors"))
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self.segments.append(self.get_file_segment())
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def to_numpy(value):
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if type(value) is np.ndarray:
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@ -710,9 +744,29 @@ if __name__ == "__main__":
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with open(filename, "rb") as fh:
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data = fh.read()
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try:
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atr = AtrDiskImage(data)
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print "%s: %s" % (filename, atr)
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data = to_numpy(data)
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atr = None
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try:
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header = AtrHeader(data[0:16])
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for format in [KBootImage, AtariDosDiskImage]:
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print "trying", format.__name__
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try:
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atr = format(data)
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print "%s: %s" % (filename, atr)
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break
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except InvalidDiskImage:
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pass
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except InvalidAtrHeader:
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for format in [AtariDosDiskImage]:
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try:
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atr = format(data)
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print "%s: %s" % (filename, atr)
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break
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except:
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raise
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#pass
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except:
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raise
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print "%s: Doesn't look like a supported disk image" % filename
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try:
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xex = AtariDosFile(data)
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