138 lines
4.6 KiB
Python
138 lines
4.6 KiB
Python
r"""Routines to decode AppleSingle files
|
|
"""
|
|
import struct
|
|
import sys
|
|
try:
|
|
import MacOS
|
|
import Carbon.File
|
|
except:
|
|
class MacOS:
|
|
def openrf(path, mode):
|
|
return open(path + '.rsrc', mode)
|
|
openrf = classmethod(openrf)
|
|
class Carbon:
|
|
class File:
|
|
class FSSpec:
|
|
pass
|
|
class FSRef:
|
|
pass
|
|
class Alias:
|
|
pass
|
|
|
|
# all of the errors in this module are really errors in the input
|
|
# so I think it should test positive against ValueError.
|
|
class Error(ValueError):
|
|
pass
|
|
|
|
# File header format: magic, version, unused, number of entries
|
|
AS_HEADER_FORMAT=">ll16sh"
|
|
AS_HEADER_LENGTH=26
|
|
# The flag words for AppleSingle
|
|
AS_MAGIC=0x00051600
|
|
AS_VERSION=0x00020000
|
|
|
|
# Entry header format: id, offset, length
|
|
AS_ENTRY_FORMAT=">lll"
|
|
AS_ENTRY_LENGTH=12
|
|
|
|
# The id values
|
|
AS_DATAFORK=1
|
|
AS_RESOURCEFORK=2
|
|
AS_IGNORE=(3,4,5,6,8,9,10,11,12,13,14,15)
|
|
|
|
class AppleSingle(object):
|
|
datafork = None
|
|
resourcefork = None
|
|
|
|
def __init__(self, fileobj, verbose=False):
|
|
header = fileobj.read(AS_HEADER_LENGTH)
|
|
try:
|
|
magic, version, ig, nentry = struct.unpack(AS_HEADER_FORMAT, header)
|
|
except ValueError, arg:
|
|
raise Error, "Unpack header error: %s" % (arg,)
|
|
if verbose:
|
|
print 'Magic: 0x%8.8x' % (magic,)
|
|
print 'Version: 0x%8.8x' % (version,)
|
|
print 'Entries: %d' % (nentry,)
|
|
if magic != AS_MAGIC:
|
|
raise Error, "Unknown AppleSingle magic number 0x%8.8x" % (magic,)
|
|
if version != AS_VERSION:
|
|
raise Error, "Unknown AppleSingle version number 0x%8.8x" % (version,)
|
|
if nentry <= 0:
|
|
raise Error, "AppleSingle file contains no forks"
|
|
headers = [fileobj.read(AS_ENTRY_LENGTH) for i in xrange(nentry)]
|
|
self.forks = []
|
|
for hdr in headers:
|
|
try:
|
|
restype, offset, length = struct.unpack(AS_ENTRY_FORMAT, hdr)
|
|
except ValueError, arg:
|
|
raise Error, "Unpack entry error: %s" % (arg,)
|
|
if verbose:
|
|
print "Fork %d, offset %d, length %d" % (restype, offset, length)
|
|
fileobj.seek(offset)
|
|
data = fileobj.read(length)
|
|
if len(data) != length:
|
|
raise Error, "Short read: expected %d bytes got %d" % (length, len(data))
|
|
self.forks.append((restype, data))
|
|
if restype == AS_DATAFORK:
|
|
self.datafork = data
|
|
elif restype == AS_RESOURCEFORK:
|
|
self.resourcefork = data
|
|
|
|
def tofile(self, path, resonly=False):
|
|
outfile = open(path, 'wb')
|
|
data = False
|
|
if resonly:
|
|
if self.resourcefork is None:
|
|
raise Error, "No resource fork found"
|
|
fp = open(path, 'wb')
|
|
fp.write(self.resourcefork)
|
|
fp.close()
|
|
elif (self.resourcefork is None and self.datafork is None):
|
|
raise Error, "No useful forks found"
|
|
else:
|
|
if self.datafork is not None:
|
|
fp = open(path, 'wb')
|
|
fp.write(self.datafork)
|
|
fp.close()
|
|
if self.resourcefork is not None:
|
|
fp = MacOS.openrf(path, '*wb')
|
|
fp.write(self.resourcefork)
|
|
fp.close()
|
|
|
|
def decode(infile, outpath, resonly=False, verbose=False):
|
|
"""decode(infile, outpath [, resonly=False, verbose=False])
|
|
|
|
Creates a decoded file from an AppleSingle encoded file.
|
|
If resonly is True, then it will create a regular file at
|
|
outpath containing only the resource fork from infile.
|
|
Otherwise it will create an AppleDouble file at outpath
|
|
with the data and resource forks from infile. On platforms
|
|
without the MacOS module, it will create inpath and inpath+'.rsrc'
|
|
with the data and resource forks respectively.
|
|
|
|
"""
|
|
if not hasattr(infile, 'read'):
|
|
if isinstance(infile, Carbon.File.Alias):
|
|
infile = infile.ResolveAlias()[0]
|
|
if isinstance(infile, (Carbon.File.FSSpec, Carbon.File.FSRef)):
|
|
infile = infile.as_pathname()
|
|
infile = open(infile, 'rb')
|
|
|
|
asfile = AppleSingle(infile, verbose=verbose)
|
|
asfile.tofile(outpath, resonly=resonly)
|
|
|
|
def _test():
|
|
if len(sys.argv) < 3 or sys.argv[1] == '-r' and len(sys.argv) != 4:
|
|
print 'Usage: applesingle.py [-r] applesinglefile decodedfile'
|
|
sys.exit(1)
|
|
if sys.argv[1] == '-r':
|
|
resonly = True
|
|
del sys.argv[1]
|
|
else:
|
|
resonly = False
|
|
decode(sys.argv[1], sys.argv[2], resonly=resonly)
|
|
|
|
if __name__ == '__main__':
|
|
_test()
|