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137 lines
4.6 KiB
Python
137 lines
4.6 KiB
Python
r"""Routines to decode AppleSingle files
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"""
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import struct
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import sys
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try:
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import MacOS
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import Carbon.File
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except:
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class MacOS:
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def openrf(path, mode):
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return open(path + '.rsrc', mode)
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openrf = classmethod(openrf)
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class Carbon:
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class File:
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class FSSpec:
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pass
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class FSRef:
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pass
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class Alias:
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pass
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# all of the errors in this module are really errors in the input
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# so I think it should test positive against ValueError.
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class Error(ValueError):
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pass
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# File header format: magic, version, unused, number of entries
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AS_HEADER_FORMAT=">LL16sh"
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AS_HEADER_LENGTH=26
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# The flag words for AppleSingle
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AS_MAGIC=0x00051600
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AS_VERSION=0x00020000
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# Entry header format: id, offset, length
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AS_ENTRY_FORMAT=">lll"
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AS_ENTRY_LENGTH=12
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# The id values
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AS_DATAFORK=1
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AS_RESOURCEFORK=2
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AS_IGNORE=(3,4,5,6,8,9,10,11,12,13,14,15)
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class AppleSingle(object):
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datafork = None
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resourcefork = None
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def __init__(self, fileobj, verbose=False):
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header = fileobj.read(AS_HEADER_LENGTH)
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try:
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magic, version, ig, nentry = struct.unpack(AS_HEADER_FORMAT, header)
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except ValueError, arg:
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raise Error, "Unpack header error: %s" % (arg,)
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if verbose:
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print 'Magic: 0x%8.8x' % (magic,)
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print 'Version: 0x%8.8x' % (version,)
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print 'Entries: %d' % (nentry,)
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if magic != AS_MAGIC:
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raise Error, "Unknown AppleSingle magic number 0x%8.8x" % (magic,)
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if version != AS_VERSION:
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raise Error, "Unknown AppleSingle version number 0x%8.8x" % (version,)
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if nentry <= 0:
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raise Error, "AppleSingle file contains no forks"
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headers = [fileobj.read(AS_ENTRY_LENGTH) for i in xrange(nentry)]
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self.forks = []
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for hdr in headers:
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try:
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restype, offset, length = struct.unpack(AS_ENTRY_FORMAT, hdr)
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except ValueError, arg:
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raise Error, "Unpack entry error: %s" % (arg,)
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if verbose:
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print "Fork %d, offset %d, length %d" % (restype, offset, length)
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fileobj.seek(offset)
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data = fileobj.read(length)
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if len(data) != length:
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raise Error, "Short read: expected %d bytes got %d" % (length, len(data))
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self.forks.append((restype, data))
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if restype == AS_DATAFORK:
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self.datafork = data
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elif restype == AS_RESOURCEFORK:
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self.resourcefork = data
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def tofile(self, path, resonly=False):
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outfile = open(path, 'wb')
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data = False
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if resonly:
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if self.resourcefork is None:
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raise Error, "No resource fork found"
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fp = open(path, 'wb')
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fp.write(self.resourcefork)
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fp.close()
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elif (self.resourcefork is None and self.datafork is None):
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raise Error, "No useful forks found"
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else:
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if self.datafork is not None:
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fp = open(path, 'wb')
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fp.write(self.datafork)
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fp.close()
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if self.resourcefork is not None:
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fp = MacOS.openrf(path, '*wb')
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fp.write(self.resourcefork)
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fp.close()
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def decode(infile, outpath, resonly=False, verbose=False):
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"""decode(infile, outpath [, resonly=False, verbose=False])
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Creates a decoded file from an AppleSingle encoded file.
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If resonly is True, then it will create a regular file at
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outpath containing only the resource fork from infile.
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Otherwise it will create an AppleDouble file at outpath
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with the data and resource forks from infile. On platforms
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without the MacOS module, it will create inpath and inpath+'.rsrc'
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with the data and resource forks respectively.
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"""
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if not hasattr(infile, 'read'):
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if isinstance(infile, Carbon.File.Alias):
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infile = infile.ResolveAlias()[0]
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if isinstance(infile, (Carbon.File.FSSpec, Carbon.File.FSRef)):
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infile = infile.as_pathname()
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infile = open(infile, 'rb')
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asfile = AppleSingle(infile, verbose=verbose)
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asfile.tofile(outpath, resonly=resonly)
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def _test():
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if len(sys.argv) < 3 or sys.argv[1] == '-r' and len(sys.argv) != 4:
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print 'Usage: applesingle.py [-r] applesinglefile decodedfile'
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sys.exit(1)
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if sys.argv[1] == '-r':
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resonly = True
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del sys.argv[1]
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else:
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resonly = False
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decode(sys.argv[1], sys.argv[2], resonly=resonly)
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if __name__ == '__main__':
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_test()
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