131 lines
4.2 KiB
Python
131 lines
4.2 KiB
Python
#!/usr/bin/env python3
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#Created by Don Barber, don@dgb3.net
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#Pass the raw disk image on the command line as argument 1
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#add verbose as argument 2 if you want some extra details
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#MFS implementation details from https://www.macgui.com/news/article.php?t=482
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#If the image is a diskcopy 4.2 image, extract the raw MFS image first via:
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# dd if=INPUTFILE of=OUTPUTFILE bs=84 skip=1
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#Idea for improvement: extract files as macbinary format instead of
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#individual data and resource forks
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import sys
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import os
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import math
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filename=sys.argv[1]
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file_size = os.path.getsize(filename)
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fh=open(filename,"rb")
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fh.seek(1026)
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drCrDate = int.from_bytes(fh.read(4),'big')
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drLsBkUp = int.from_bytes(fh.read(4),'big')
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drAtrb=int.from_bytes(fh.read(2),'big')
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drNmFls=int.from_bytes(fh.read(2),'big')
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drDirSt=int.from_bytes(fh.read(2),'big')
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drBlLen=int.from_bytes(fh.read(2),'big')
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drNmAlBlks=int.from_bytes(fh.read(2),'big')
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drAlBlkSiz=int.from_bytes(fh.read(4),'big')
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drClpSiz=int.from_bytes(fh.read(4),'big')
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drAlBlSt=int.from_bytes(fh.read(2),'big')
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drNxtFNum=int.from_bytes(fh.read(4),'big')
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drFreeBks=int.from_bytes(fh.read(2),'big')
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drVNl=int.from_bytes(fh.read(1),'big')
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drVN=fh.read(drVNl)
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print("Volume Name:",drVN)
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if 'verbose' in sys.argv:
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print("Volume Create Datestamp:",drCrDate)
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print("Volume Modify Datestamp:",drLsBkUp)
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maplocation=0x440
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def getmapentry(blocknum):
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location=((blocknum-2)*12/8)
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if location==math.ceil(location):
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fh.seek(maplocation+int(location))
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entry=(int.from_bytes(fh.read(2),'big') >> 4)
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else:
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fh.seek(maplocation+math.floor(location))
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entry=(int.from_bytes(fh.read(2),'big') & 0xFFF )
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return entry
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def getfilecontents(block,length):
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blocklist=[block]
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while True:
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block=getmapentry(block)
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#print(block)
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if block==1:
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break
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blocklist.append(block)
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if block==0:
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raise Exception("Unused Block")
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if 'verbose' in sys.argv:
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print("Blocklist:",blocklist)
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contents=b''
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for block in blocklist:
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if 'verbose' in sys.argv:
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print("Seeking to:",hex(drAlBlSt*512+(block-2)*drAlBlkSiz),"for block",block)
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fh.seek(drAlBlSt*512+(block-2)*drAlBlkSiz)
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data=fh.read(drAlBlkSiz)
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contents+=data
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return contents[:length]
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fh.seek(drDirSt*512)
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while True:
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flFlgs=fh.read(1)
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flType=int.from_bytes(fh.read(1),'big')
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while flFlgs==b'\x00': #loop until next record found
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flFlgs=fh.read(1)
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flType=int.from_bytes(fh.read(1),'big')
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if fh.tell()>=((drDirSt+drBlLen-1)*512): #we're past the end of the file directory, exit out
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break
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if fh.tell()>=((drDirSt+drBlLen-1)*512): #we're past the end of the file directory, exit out
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break
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if flFlgs!=b'\x00':
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flUsrWds=fh.read(16)
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flFlNum=int.from_bytes(fh.read(4),'big')
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flStBlk=int.from_bytes(fh.read(2),'big')
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flLgLen=int.from_bytes(fh.read(4),'big')
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flPyLen=int.from_bytes(fh.read(4),'big')
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flRStBlk=int.from_bytes(fh.read(2),'big')
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flRLgLen=int.from_bytes(fh.read(4),'big')
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flRPyLen=int.from_bytes(fh.read(4),'big')
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flCrDat=int.from_bytes(fh.read(4),'big')
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flMdDat=int.from_bytes(fh.read(4),'big')
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flNaml=int.from_bytes(fh.read(1),'big')
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flNam=fh.read(flNaml)
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if (fh.tell()%2==1): #align to word boundary after reading name
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fh.read(1)
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if flFlNum!=0:
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print(hex(fh.tell()),flFlNum,flNaml,flNam)
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if 'verbose' in sys.argv:
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print("Create Datestamp:",flCrDat)
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print("Modify Datestamp:",flMdDat)
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location=fh.tell()
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oh=open(flNam+b".info","wb")
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oh.write(flUsrWds)
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oh.close()
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if(flStBlk==0 and flRStBlk==0):
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print("Error:",flNam,"has neither data nor resource fork")
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if flStBlk!=0:
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content=getfilecontents(flStBlk,flLgLen)
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oh=open(flNam+b".data","wb")
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oh.write(content)
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oh.close()
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if flRStBlk!=0:
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content=getfilecontents(flRStBlk,flRLgLen)
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oh=open(flNam+b".rsrc","wb")
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oh.write(content)
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oh.close()
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fh.seek(location)
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fh.close()
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