Initial checkin
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Bobbi Webber-Manners
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#!/usr/bin/python3
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#
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# Simple tool to manipulate MicroDrive/Turbo CF Disk Images
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# Bobbi 2021
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#
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import getopt
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import os
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import sys
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# Sensible defaults for 512MB CF Card
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default_cyls = 1006
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default_heads = 16
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default_sectors = 63
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default_gsvers = 0 # Apple //e
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parttab = dict()
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parttab['cyls'] = -1
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parttab['heads'] = -1
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parttab['sectors'] = -1
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parttab['gsvers'] = -1
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parttab['numparts1'] = 0
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parttab['numparts2'] = 0
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parttab['start1'] = list()
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parttab['len1'] = list()
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parttab['start2'] = list()
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parttab['len2'] = list()
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blocksz = 512
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# Write val as a 16 bit integer into array data[], starting at index start
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def write16(data, start, val):
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data[start] = val & 0x00ff
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data[start + 1] = (val & 0xff00) >> 8
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# Read a 32 bit integer from array data[], starting at index start
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def read32(data, start):
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return (data[start] + 256 * (data[start+ 1]
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+ (256 * data[start+ 2] + (256 * data[start+ 3]))))
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# Write val as a 32 bit integer into array data[], starting at index start
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def write32(data, start, val):
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data[start] = val & 0x000000ff
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data[start + 1] = (val & 0x0000ff00) >> 8
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data[start + 2] = (val & 0x00ff0000) >> 16
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data[start + 3] = (val & 0xff000000) >> 24
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# Parse partition table from file f and populate parttab
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def read_part_tbl(f):
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with open(f, 'rb') as infile:
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b = infile.read(blocksz)
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parttab['cyls'] = b[0x02] + b[0x03] * 256
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parttab['heads'] = b[0x06] + b[0x07] * 256
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parttab['sectors'] = b[0x08] + b[0x09] * 256
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parttab['numparts1'] = b[0x0c]
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parttab['numparts2'] = b[0x0d]
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parttab['gsvers'] = b[0x18] + b[0x19] * 256
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parttab['start1'] = list()
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parttab['len1'] = list()
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parttab['start2'] = list()
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parttab['len2'] = list()
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if parttab['numparts1'] > 0:
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idx = 0x20
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for i in range(parttab['numparts1']):
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parttab['start1'].append(read32(b, idx + i * 4))
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parttab['len1'].append(read32(b, idx + 0x20 + i * 4))
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if parttab['numparts2'] > 0:
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idx = 0x80
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for i in range(parttab['numparts2']):
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parttab['start2'].append(read32(b, idx + i * 4))
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parttab['len2'].append(read32(b, idx + 0x20 + i * 4))
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# Display partition table information in parttab
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def print_part_tbl():
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print('\nMicroDrive/Turbo Partition Table\n')
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print(' Cylinders: {}'.format(parttab['cyls']))
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print(' Heads: {}'.format(parttab['heads']))
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print(' Sectors: {}'.format(parttab['sectors']))
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print(' GS ROM Vers: {}'.format(parttab['gsvers']))
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if parttab['numparts1'] > 0:
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print('\n # Start End Length')
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for i in range(parttab['numparts1']):
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st = parttab['start1'][i]
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ln = parttab['len1'][i]
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print(' {0} {1:8d} {2:8d} {3:8d}'
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.format(i + 1, st, st + ln - 1, ln))
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if parttab['numparts2'] > 0:
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for i in range(parttab['numparts2']):
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st = parttab['start2'][i]
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ln = parttab['len2'][i]
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print(' {0} {1:8d} {2:8d} {3:8d}'
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.format(i + 9, st, st + ln - 1, ln))
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# Write partition table in parttab to file f
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# Writes 256 blocks (ie 128K)
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def write_part_tbl(f):
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magic = 0xcacc
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if ((parttab['cyls'] == -1)
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or (parttab['heads'] == -1)
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or (parttab['sectors'] == -1)
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or (parttab['gsvers'] == -1)
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or (parttab['numparts1'] == -1)
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or (parttab['numparts2'] == -1)):
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print('** Not writing partition table - uninitialized data **')
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exit()
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print(parttab)
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b = [0] * blocksz
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write16(b, 0x00, magic)
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write16(b, 0x02, parttab['cyls'])
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write16(b, 0x06, parttab['heads'])
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write16(b, 0x08, parttab['sectors'])
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b[0x0c] = parttab['numparts1']
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b[0x0d] = parttab['numparts2']
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write16(b, 0x18, parttab['gsvers'])
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for i in range(parttab['numparts1']):
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write32(b, 0x20 + i * 4, parttab['start1'][i])
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write32(b, 0x40 + i * 4, parttab['len1'][i])
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for i in range(parttab['numparts2']):
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write32(b, 0x80 + i * 4, parttab['start2'][i])
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write32(b, 0xa0 + i * 4, parttab['len2'][i])
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block = bytes(b)
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with open(f, 'wb') as outfile:
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outfile.write(block)
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blanks = bytes([0] * blocksz)
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for i in range(255):
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outfile.write(blanks)
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# Extract partition n from file f and write it to outputfile
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def extract_partition(f, n, outputfile):
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if n < 8:
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st = parttab['start1'][n]
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ln = parttab['len1'][n]
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else:
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st = parttab['start2'][n - 8]
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ln = parttab['len2'][n - 8]
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with open(f, 'rb') as infile:
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infile.seek(st * blocksz)
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d = infile.read(ln * blocksz)
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print('Writing {} bytes to {}'.format(len(d), outputfile))
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with open(outputfile, 'wb') as outfile:
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outfile.write(d)
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# Extract all partitions from file f
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def explode_mdt_image(f):
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for i in range(parttab['numparts1']):
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filename = 'partition{}.po'.format(i + 1)
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extract_partition(f, i, filename)
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for i in range(parttab['numparts2']):
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filename = 'partition{}.po'.format(i + 9)
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extract_partition(f, i + 8, filename)
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# Replace an existing partition n in file f with file newpartfile
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# Checks newpartfile is the correct size to fit the partition
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def replace_partition(f, n, newpartfile):
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# TODO
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pass
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# Build an MDT image file f from a list of .po files and update the
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# partition table to match the files
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def assemble_mdt_image(f, files):
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# Add a partition to parttab. i is the zero-based index
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def add_partition(i, start, length):
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if i < 8:
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parttab['start1'].append(start)
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parttab['len1'].append(length)
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parttab['numparts1'] += 1
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else:
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parttab['start2'].append(start)
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parttab['len2'].append(length)
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parttab['numparts2'] += 1
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currblk = 256
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numparts = 0
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for filename in files:
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status = os.stat(filename)
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sz = status.st_size // 512
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add_partition(numparts, currblk, sz)
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numparts += 1
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currblk += sz
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write_part_tbl(f)
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for filename in files:
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with open(filename, 'rb') as infile:
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d = infile.read()
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with open(f, 'ab') as outfile:
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outfile.write(d)
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def initialize_blank_mdt():
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pass
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def usage():
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print('Usage:')
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print(' mdttool [-haxlCHSG] [-o outputfile] inputfile [inputfile2...]\n')
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print(' -h Show this help')
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print(' -a Assemble CF Card image from list of .PO disk images')
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print(' -x eXplode a CF Card image into constituent partitions')
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print(' -l Display partition table');
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print(' -C Set number of cylinders (when assembling new image)')
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print(' -H Set number of heads (when assembling new image)')
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print(' -S Set number of sectors (when assembling new image)')
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print(' -G Set GS ROM version (when assembling new image)')
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# Main entry point and argument handling
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def main():
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try:
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opts, args = getopt.getopt(
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sys.argv[1:],
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'ho:axlCHSG',
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['help', 'output=', 'assemble', 'explode', 'list',
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'cylinders', 'heads', 'sectors', 'gs'])
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except getopt.GetoptError as err:
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print(err)
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usage()
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sys.exit(2)
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infile = None
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outfile = None
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assemble = False
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explode = False
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printtab = False
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cylinders = default_cyls
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heads = default_heads
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sectors = default_sectors
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gsvers = default_gsvers
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for o, a in opts:
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if o in ('-h', '--help'):
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usage()
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sys.exit()
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elif o in ('-o', '--output'):
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outfile = a
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elif o in ('-a', '--assemble'):
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assemble = True
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elif o in ('-x', '--explode'):
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explode = True
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elif o in ('-l', '--list'):
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printtab = True
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elif o in ('-C', '--cylinders'):
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cylinders = a
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elif o in ('-H', '--heads'):
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heads = a
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elif o in ('-S', '--sectors'):
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sectors = a
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elif o in ('G', '--gs'):
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gsvers = a
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else:
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assert False, 'Unhandled option'
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if assemble:
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if len(args) == 0:
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print('Need at least one input file to assemble')
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usage()
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sys.exit(2)
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if outfile == None:
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print('Must specify output file with -o')
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usage()
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sys.exit(2)
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parttab['cyls'] = cylinders
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parttab['heads'] = heads
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parttab['sectors'] = sectors
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parttab['gsvers'] = gsvers
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assemble_mdt_image(outfile, args)
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else:
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if len(args) == 0:
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print('No input file provided')
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usage()
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sys.exit(2)
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if len(args) > 1:
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print('Provide only one input file')
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usage()
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sys.exit(2)
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read_part_tbl(args[0])
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if printtab:
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print_part_tbl()
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if explode:
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explode_mdt_image(args[0])
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sys.exit()
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main()
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