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Edit File : binhex.py \| Size : 13.63 KB
"""Macintosh binhex compression/decompression. easy interface: binhex(inputfilename, outputfilename) hexbin(inputfilename, outputfilename) """ # # Jack Jansen, CWI, August 1995. # # The module is supposed to be as compatible as possible. Especially the # easy interface should work "as expected" on any platform. # XXXX Note: currently, textfiles appear in mac-form on all platforms. # We seem to lack a simple character-translate in python. # (we should probably use ISO-Latin-1 on all but the mac platform). # XXXX The simple routines are too simple: they expect to hold the complete # files in-core. Should be fixed. # XXXX It would be nice to handle AppleDouble format on unix # (for servers serving macs). # XXXX I don't understand what happens when you get 0x90 times the same byte on # input. The resulting code (xx 90 90) would appear to be interpreted as an # escaped value of 0x90. All coders I've seen appear to ignore this nicety... # import io import os import struct import binascii __all__ = ["binhex","hexbin","Error"] class Error(Exception): pass # States (what have we written) _DID_HEADER = 0 _DID_DATA = 1 # Various constants REASONABLY_LARGE = 32768 # Minimal amount we pass the rle-coder LINELEN = 64 RUNCHAR = b"\x90" # # This code is no longer byte-order dependent class FInfo: def __init__(self): self.Type = '????' self.Creator = '????' self.Flags = 0 def getfileinfo(name): finfo = FInfo() with io.open(name, 'rb') as fp: # Quick check for textfile data = fp.read(512) if 0 not in data: finfo.Type = 'TEXT' fp.seek(0, 2) dsize = fp.tell() dir, file = os.path.split(name) file = file.replace(':', '-', 1) return file, finfo, dsize, 0 class openrsrc: def __init__(self, args): pass def read(self, args): return b'' def write(self, args): pass def close(self): pass class _Hqxcoderengine: """Write data to the coder in 3-byte chunks""" def __init__(self, ofp): self.ofp = ofp self.data = b'' self.hqxdata = b'' self.linelen = LINELEN - 1 def write(self, data): self.data = self.data + data datalen = len(self.data) todo = (datalen // 3) 3 data = self.data[:todo] self.data = self.data[todo:] if not data: return self.hqxdata = self.hqxdata + binascii.b2a_hqx(data) self._flush(0) def _flush(self, force): first = 0 while first <= len(self.hqxdata) - self.linelen: last = first + self.linelen self.ofp.write(self.hqxdata[first:last] + b'\n') self.linelen = LINELEN first = last self.hqxdata = self.hqxdata[first:] if force: self.ofp.write(self.hqxdata + b':\n') def close(self): if self.data: self.hqxdata = self.hqxdata + binascii.b2a_hqx(self.data) self._flush(1) self.ofp.close() del self.ofp class _Rlecoderengine: """Write data to the RLE-coder in suitably large chunks""" def __init__(self, ofp): self.ofp = ofp self.data = b'' def write(self, data): self.data = self.data + data if len(self.data) < REASONABLY_LARGE: return rledata = binascii.rlecode_hqx(self.data) self.ofp.write(rledata) self.data = b'' def close(self): if self.data: rledata = binascii.rlecode_hqx(self.data) self.ofp.write(rledata) self.ofp.close() del self.ofp class BinHex: def __init__(self, name_finfo_dlen_rlen, ofp): name, finfo, dlen, rlen = name_finfo_dlen_rlen close_on_error = False if isinstance(ofp, str): ofname = ofp ofp = io.open(ofname, 'wb') close_on_error = True try: ofp.write(b'(This file must be converted with BinHex 4.0)\r\r:') hqxer = _Hqxcoderengine(ofp) self.ofp = _Rlecoderengine(hqxer) self.crc = 0 if finfo is None: finfo = FInfo() self.dlen = dlen self.rlen = rlen self._writeinfo(name, finfo) self.state = _DID_HEADER except: if close_on_error: ofp.close() raise def _writeinfo(self, name, finfo): nl = len(name) if nl > 63: raise Error('Filename too long') d = bytes([nl]) + name.encode("latin-1") + b'\0' tp, cr = finfo.Type, finfo.Creator if isinstance(tp, str): tp = tp.encode("latin-1") if isinstance(cr, str): cr = cr.encode("latin-1") d2 = tp + cr # Force all structs to be packed with big-endian d3 = struct.pack('>h', finfo.Flags) d4 = struct.pack('>ii', self.dlen, self.rlen) info = d + d2 + d3 + d4 self._write(info) self._writecrc() def _write(self, data): self.crc = binascii.crc_hqx(data, self.crc) self.ofp.write(data) def _writecrc(self): # XXXX Should this be here?? # self.crc = binascii.crc_hqx('\0\0', self.crc) if self.crc < 0: fmt = '>h' else: fmt = '>H' self.ofp.write(struct.pack(fmt, self.crc)) self.crc = 0 def write(self, data): if self.state != _DID_HEADER: raise Error('Writing data at the wrong time') self.dlen = self.dlen - len(data) self._write(data) def close_data(self): if self.dlen != 0: raise Error('Incorrect data size, diff=%r' % (self.rlen,)) self._writecrc() self.state = _DID_DATA def write_rsrc(self, data): if self.state < _DID_DATA: self.close_data() if self.state != _DID_DATA: raise Error('Writing resource data at the wrong time') self.rlen = self.rlen - len(data) self._write(data) def close(self): if self.state is None: return try: if self.state < _DID_DATA: self.close_data() if self.state != _DID_DATA: raise Error('Close at the wrong time') if self.rlen != 0: raise Error("Incorrect resource-datasize, diff=%r" % (self.rlen,)) self._writecrc() finally: self.state = None ofp = self.ofp del self.ofp ofp.close() def binhex(inp, out): """binhex(infilename, outfilename): create binhex-encoded copy of a file""" finfo = getfileinfo(inp) ofp = BinHex(finfo, out) with io.open(inp, 'rb') as ifp: # XXXX Do textfile translation on non-mac systems while True: d = ifp.read(128000) if not d: break ofp.write(d) ofp.close_data() ifp = openrsrc(inp, 'rb') while True: d = ifp.read(128000) if not d: break ofp.write_rsrc(d) ofp.close() ifp.close() class _Hqxdecoderengine: """Read data via the decoder in 4-byte chunks""" def __init__(self, ifp): self.ifp = ifp self.eof = 0 def read(self, totalwtd): """Read at least wtd bytes (or until EOF)""" decdata = b'' wtd = totalwtd # # The loop here is convoluted, since we don't really now how # much to decode: there may be newlines in the incoming data. while wtd > 0: if self.eof: return decdata wtd = ((wtd + 2) // 3) * 4 data = self.ifp.read(wtd) # # Next problem: there may not be a complete number of # bytes in what we pass to a2b. Solve by yet another # loop. # while True: try: decdatacur, self.eof = binascii.a2b_hqx(data) break except binascii.Incomplete: pass newdata = self.ifp.read(1) if not newdata: raise Error('Premature EOF on binhex file') data = data + newdata decdata = decdata + decdatacur wtd = totalwtd - len(decdata) if not decdata and not self.eof: raise Error('Premature EOF on binhex file') return decdata def close(self): self.ifp.close() class _Rledecoderengine: """Read data via the RLE-coder""" def __init__(self, ifp): self.ifp = ifp self.pre_buffer = b'' self.post_buffer = b'' self.eof = 0 def read(self, wtd): if wtd > len(self.post_buffer): self._fill(wtd - len(self.post_buffer)) rv = self.post_buffer[:wtd] self.post_buffer = self.post_buffer[wtd:] return rv def _fill(self, wtd): self.pre_buffer = self.pre_buffer + self.ifp.read(wtd + 4) if self.ifp.eof: self.post_buffer = self.post_buffer + \ binascii.rledecode_hqx(self.pre_buffer) self.pre_buffer = b'' return # # Obfuscated code ahead. We have to take care that we don't # end up with an orphaned RUNCHAR later on. So, we keep a couple # of bytes in the buffer, depending on what the end of # the buffer looks like: # '\220\0\220' - Keep 3 bytes: repeated \220 (escaped as \220\0) # '?\220' - Keep 2 bytes: repeated something-else # '\220\0' - Escaped \220: Keep 2 bytes. # '?\220?' - Complete repeat sequence: decode all # otherwise: keep 1 byte. # mark = len(self.pre_buffer) if self.pre_buffer[-3:] == RUNCHAR + b'\0' + RUNCHAR: mark = mark - 3 elif self.pre_buffer[-1:] == RUNCHAR: mark = mark - 2 elif self.pre_buffer[-2:] == RUNCHAR + b'\0': mark = mark - 2 elif self.pre_buffer[-2:-1] == RUNCHAR: pass # Decode all else: mark = mark - 1 self.post_buffer = self.post_buffer + \ binascii.rledecode_hqx(self.pre_buffer[:mark]) self.pre_buffer = self.pre_buffer[mark:] def close(self): self.ifp.close() class HexBin: def __init__(self, ifp): if isinstance(ifp, str): ifp = io.open(ifp, 'rb') # # Find initial colon. # while True: ch = ifp.read(1) if not ch: raise Error("No binhex data found") # Cater for \r\n terminated lines (which show up as \n\r, hence # all lines start with \r) if ch == b'\r': continue if ch == b':': break hqxifp = _Hqxdecoderengine(ifp) self.ifp = _Rledecoderengine(hqxifp) self.crc = 0 self._readheader() def _read(self, len): data = self.ifp.read(len) self.crc = binascii.crc_hqx(data, self.crc) return data def _checkcrc(self): filecrc = struct.unpack('>h', self.ifp.read(2))[0] & 0xffff #self.crc = binascii.crc_hqx('\0\0', self.crc) # XXXX Is this needed?? self.crc = self.crc & 0xffff if filecrc != self.crc: raise Error('CRC error, computed %x, read %x' % (self.crc, filecrc)) self.crc = 0 def _readheader(self): len = self._read(1) fname = self._read(ord(len)) rest = self._read(1 + 4 + 4 + 2 + 4 + 4) self._checkcrc() type = rest[1:5] creator = rest[5:9] flags = struct.unpack('>h', rest[9:11])[0] self.dlen = struct.unpack('>l', rest[11:15])[0] self.rlen = struct.unpack('>l', rest[15:19])[0] self.FName = fname self.FInfo = FInfo() self.FInfo.Creator = creator self.FInfo.Type = type self.FInfo.Flags = flags self.state = _DID_HEADER def read(self, n): if self.state != _DID_HEADER: raise Error('Read data at wrong time') if n: n = n[0] n = min(n, self.dlen) else: n = self.dlen rv = b'' while len(rv) < n: rv = rv + self._read(n-len(rv)) self.dlen = self.dlen - n return rv def close_data(self): if self.state != _DID_HEADER: raise Error('close_data at wrong time') if self.dlen: dummy = self._read(self.dlen) self._checkcrc() self.state = _DID_DATA def read_rsrc(self, n): if self.state == _DID_HEADER: self.close_data() if self.state != _DID_DATA: raise Error('Read resource data at wrong time') if n: n = n[0] n = min(n, self.rlen) else: n = self.rlen self.rlen = self.rlen - n return self._read(n) def close(self): if self.state is None: return try: if self.rlen: dummy = self.read_rsrc(self.rlen) self._checkcrc() finally: self.state = None self.ifp.close() def hexbin(inp, out): """hexbin(infilename, outfilename) - Decode binhexed file""" ifp = HexBin(inp) finfo = ifp.FInfo if not out: out = ifp.FName with io.open(out, 'wb') as ofp: # XXXX Do translation on non-mac systems while True: d = ifp.read(128000) if not d: break ofp.write(d) ifp.close_data() d = ifp.read_rsrc(128000) if d: ofp = openrsrc(out, 'wb') ofp.write(d) while True: d = ifp.read_rsrc(128000) if not d: break ofp.write(d) ofp.close() ifp.close() Back

Edit File : binhex.py | Size : 13.63 KB

"""Macintosh binhex compression/decompression.

easy interface:
binhex(inputfilename, outputfilename)
hexbin(inputfilename, outputfilename)
"""

#
# Jack Jansen, CWI, August 1995.
#
# The module is supposed to be as compatible as possible. Especially the
# easy interface should work "as expected" on any platform.
# XXXX Note: currently, textfiles appear in mac-form on all platforms.
# We seem to lack a simple character-translate in python.
# (we should probably use ISO-Latin-1 on all but the mac platform).
# XXXX The simple routines are too simple: they expect to hold the complete
# files in-core. Should be fixed.
# XXXX It would be nice to handle AppleDouble format on unix
# (for servers serving macs).
# XXXX I don't understand what happens when you get 0x90 times the same byte on
# input. The resulting code (xx 90 90) would appear to be interpreted as an
# escaped *value* of 0x90. All coders I've seen appear to ignore this nicety...
#
import io
import os
import struct
import binascii

__all__ = ["binhex","hexbin","Error"]

class Error(Exception):
    pass

# States (what have we written)
_DID_HEADER = 0
_DID_DATA = 1

# Various constants
REASONABLY_LARGE = 32768  # Minimal amount we pass the rle-coder
LINELEN = 64
RUNCHAR = b"\x90"

#
# This code is no longer byte-order dependent

class FInfo:
    def __init__(self):
        self.Type = '????'
        self.Creator = '????'
        self.Flags = 0

def getfileinfo(name):
    finfo = FInfo()
    with io.open(name, 'rb') as fp:
        # Quick check for textfile
        data = fp.read(512)
        if 0 not in data:
            finfo.Type = 'TEXT'
        fp.seek(0, 2)
        dsize = fp.tell()
    dir, file = os.path.split(name)
    file = file.replace(':', '-', 1)
    return file, finfo, dsize, 0

class openrsrc:
    def __init__(self, *args):
        pass

def read(self, *args):
        return b''

def write(self, *args):
        pass

def close(self):
        pass

class _Hqxcoderengine:
    """Write data to the coder in 3-byte chunks"""

def __init__(self, ofp):
        self.ofp = ofp
        self.data = b''
        self.hqxdata = b''
        self.linelen = LINELEN - 1

def write(self, data):
        self.data = self.data + data
        datalen = len(self.data)
        todo = (datalen // 3) * 3
        data = self.data[:todo]
        self.data = self.data[todo:]
        if not data:
            return
        self.hqxdata = self.hqxdata + binascii.b2a_hqx(data)
        self._flush(0)

def _flush(self, force):
        first = 0
        while first <= len(self.hqxdata) - self.linelen:
            last = first + self.linelen
            self.ofp.write(self.hqxdata[first:last] + b'\n')
            self.linelen = LINELEN
            first = last
        self.hqxdata = self.hqxdata[first:]
        if force:
            self.ofp.write(self.hqxdata + b':\n')

def close(self):
        if self.data:
            self.hqxdata = self.hqxdata + binascii.b2a_hqx(self.data)
        self._flush(1)
        self.ofp.close()
        del self.ofp

class _Rlecoderengine:
    """Write data to the RLE-coder in suitably large chunks"""

def __init__(self, ofp):
        self.ofp = ofp
        self.data = b''

def write(self, data):
        self.data = self.data + data
        if len(self.data) < REASONABLY_LARGE:
            return
        rledata = binascii.rlecode_hqx(self.data)
        self.ofp.write(rledata)
        self.data = b''

def close(self):
        if self.data:
            rledata = binascii.rlecode_hqx(self.data)
            self.ofp.write(rledata)
        self.ofp.close()
        del self.ofp

class BinHex:
    def __init__(self, name_finfo_dlen_rlen, ofp):
        name, finfo, dlen, rlen = name_finfo_dlen_rlen
        close_on_error = False
        if isinstance(ofp, str):
            ofname = ofp
            ofp = io.open(ofname, 'wb')
            close_on_error = True
        try:
            ofp.write(b'(This file must be converted with BinHex 4.0)\r\r:')
            hqxer = _Hqxcoderengine(ofp)
            self.ofp = _Rlecoderengine(hqxer)
            self.crc = 0
            if finfo is None:
                finfo = FInfo()
            self.dlen = dlen
            self.rlen = rlen
            self._writeinfo(name, finfo)
            self.state = _DID_HEADER
        except:
            if close_on_error:
                ofp.close()
            raise

def _writeinfo(self, name, finfo):
        nl = len(name)
        if nl > 63:
            raise Error('Filename too long')
        d = bytes([nl]) + name.encode("latin-1") + b'\0'
        tp, cr = finfo.Type, finfo.Creator
        if isinstance(tp, str):
            tp = tp.encode("latin-1")
        if isinstance(cr, str):
            cr = cr.encode("latin-1")
        d2 = tp + cr

# Force all structs to be packed with big-endian
        d3 = struct.pack('>h', finfo.Flags)
        d4 = struct.pack('>ii', self.dlen, self.rlen)
        info = d + d2 + d3 + d4
        self._write(info)
        self._writecrc()

def _write(self, data):
        self.crc = binascii.crc_hqx(data, self.crc)
        self.ofp.write(data)

def _writecrc(self):
        # XXXX Should this be here??
        # self.crc = binascii.crc_hqx('\0\0', self.crc)
        if self.crc < 0:
            fmt = '>h'
        else:
            fmt = '>H'
        self.ofp.write(struct.pack(fmt, self.crc))
        self.crc = 0

def write(self, data):
        if self.state != _DID_HEADER:
            raise Error('Writing data at the wrong time')
        self.dlen = self.dlen - len(data)
        self._write(data)

def close_data(self):
        if self.dlen != 0:
            raise Error('Incorrect data size, diff=%r' % (self.rlen,))
        self._writecrc()
        self.state = _DID_DATA

def write_rsrc(self, data):
        if self.state < _DID_DATA:
            self.close_data()
        if self.state != _DID_DATA:
            raise Error('Writing resource data at the wrong time')
        self.rlen = self.rlen - len(data)
        self._write(data)

def close(self):
        if self.state is None:
            return
        try:
            if self.state < _DID_DATA:
                self.close_data()
            if self.state != _DID_DATA:
                raise Error('Close at the wrong time')
            if self.rlen != 0:
                raise Error("Incorrect resource-datasize, diff=%r" % (self.rlen,))
            self._writecrc()
        finally:
            self.state = None
            ofp = self.ofp
            del self.ofp
            ofp.close()

def binhex(inp, out):
    """binhex(infilename, outfilename): create binhex-encoded copy of a file"""
    finfo = getfileinfo(inp)
    ofp = BinHex(finfo, out)

with io.open(inp, 'rb') as ifp:
        # XXXX Do textfile translation on non-mac systems
        while True:
            d = ifp.read(128000)
            if not d: break
            ofp.write(d)
        ofp.close_data()

ifp = openrsrc(inp, 'rb')
    while True:
        d = ifp.read(128000)
        if not d: break
        ofp.write_rsrc(d)
    ofp.close()
    ifp.close()

class _Hqxdecoderengine:
    """Read data via the decoder in 4-byte chunks"""

def __init__(self, ifp):
        self.ifp = ifp
        self.eof = 0

def read(self, totalwtd):
        """Read at least wtd bytes (or until EOF)"""
        decdata = b''
        wtd = totalwtd
        #
        # The loop here is convoluted, since we don't really now how
        # much to decode: there may be newlines in the incoming data.
        while wtd > 0:
            if self.eof: return decdata
            wtd = ((wtd + 2) // 3) * 4
            data = self.ifp.read(wtd)
            #
            # Next problem: there may not be a complete number of
            # bytes in what we pass to a2b. Solve by yet another
            # loop.
            #
            while True:
                try:
                    decdatacur, self.eof = binascii.a2b_hqx(data)
                    break
                except binascii.Incomplete:
                    pass
                newdata = self.ifp.read(1)
                if not newdata:
                    raise Error('Premature EOF on binhex file')
                data = data + newdata
            decdata = decdata + decdatacur
            wtd = totalwtd - len(decdata)
            if not decdata and not self.eof:
                raise Error('Premature EOF on binhex file')
        return decdata

def close(self):
        self.ifp.close()

class _Rledecoderengine:
    """Read data via the RLE-coder"""

def __init__(self, ifp):
        self.ifp = ifp
        self.pre_buffer = b''
        self.post_buffer = b''
        self.eof = 0

def read(self, wtd):
        if wtd > len(self.post_buffer):
            self._fill(wtd - len(self.post_buffer))
        rv = self.post_buffer[:wtd]
        self.post_buffer = self.post_buffer[wtd:]
        return rv

def _fill(self, wtd):
        self.pre_buffer = self.pre_buffer + self.ifp.read(wtd + 4)
        if self.ifp.eof:
            self.post_buffer = self.post_buffer + \
                binascii.rledecode_hqx(self.pre_buffer)
            self.pre_buffer = b''
            return

#
        # Obfuscated code ahead. We have to take care that we don't
        # end up with an orphaned RUNCHAR later on. So, we keep a couple
        # of bytes in the buffer, depending on what the end of
        # the buffer looks like:
        # '\220\0\220' - Keep 3 bytes: repeated \220 (escaped as \220\0)
        # '?\220' - Keep 2 bytes: repeated something-else
        # '\220\0' - Escaped \220: Keep 2 bytes.
        # '?\220?' - Complete repeat sequence: decode all
        # otherwise: keep 1 byte.
        #
        mark = len(self.pre_buffer)
        if self.pre_buffer[-3:] == RUNCHAR + b'\0' + RUNCHAR:
            mark = mark - 3
        elif self.pre_buffer[-1:] == RUNCHAR:
            mark = mark - 2
        elif self.pre_buffer[-2:] == RUNCHAR + b'\0':
            mark = mark - 2
        elif self.pre_buffer[-2:-1] == RUNCHAR:
            pass # Decode all
        else:
            mark = mark - 1

self.post_buffer = self.post_buffer + \
            binascii.rledecode_hqx(self.pre_buffer[:mark])
        self.pre_buffer = self.pre_buffer[mark:]

def close(self):
        self.ifp.close()

class HexBin:
    def __init__(self, ifp):
        if isinstance(ifp, str):
            ifp = io.open(ifp, 'rb')
        #
        # Find initial colon.
        #
        while True:
            ch = ifp.read(1)
            if not ch:
                raise Error("No binhex data found")
            # Cater for \r\n terminated lines (which show up as \n\r, hence
            # all lines start with \r)
            if ch == b'\r':
                continue
            if ch == b':':
                break

hqxifp = _Hqxdecoderengine(ifp)
        self.ifp = _Rledecoderengine(hqxifp)
        self.crc = 0
        self._readheader()

def _read(self, len):
        data = self.ifp.read(len)
        self.crc = binascii.crc_hqx(data, self.crc)
        return data

def _checkcrc(self):
        filecrc = struct.unpack('>h', self.ifp.read(2))[0] & 0xffff
        #self.crc = binascii.crc_hqx('\0\0', self.crc)
        # XXXX Is this needed??
        self.crc = self.crc & 0xffff
        if filecrc != self.crc:
            raise Error('CRC error, computed %x, read %x'
                        % (self.crc, filecrc))
        self.crc = 0

def _readheader(self):
        len = self._read(1)
        fname = self._read(ord(len))
        rest = self._read(1 + 4 + 4 + 2 + 4 + 4)
        self._checkcrc()

type = rest[1:5]
        creator = rest[5:9]
        flags = struct.unpack('>h', rest[9:11])[0]
        self.dlen = struct.unpack('>l', rest[11:15])[0]
        self.rlen = struct.unpack('>l', rest[15:19])[0]

self.FName = fname
        self.FInfo = FInfo()
        self.FInfo.Creator = creator
        self.FInfo.Type = type
        self.FInfo.Flags = flags

self.state = _DID_HEADER

def read(self, *n):
        if self.state != _DID_HEADER:
            raise Error('Read data at wrong time')
        if n:
            n = n[0]
            n = min(n, self.dlen)
        else:
            n = self.dlen
        rv = b''
        while len(rv) < n:
            rv = rv + self._read(n-len(rv))
        self.dlen = self.dlen - n
        return rv

def close_data(self):
        if self.state != _DID_HEADER:
            raise Error('close_data at wrong time')
        if self.dlen:
            dummy = self._read(self.dlen)
        self._checkcrc()
        self.state = _DID_DATA

def read_rsrc(self, *n):
        if self.state == _DID_HEADER:
            self.close_data()
        if self.state != _DID_DATA:
            raise Error('Read resource data at wrong time')
        if n:
            n = n[0]
            n = min(n, self.rlen)
        else:
            n = self.rlen
        self.rlen = self.rlen - n
        return self._read(n)

def close(self):
        if self.state is None:
            return
        try:
            if self.rlen:
                dummy = self.read_rsrc(self.rlen)
            self._checkcrc()
        finally:
            self.state = None
            self.ifp.close()

def hexbin(inp, out):
    """hexbin(infilename, outfilename) - Decode binhexed file"""
    ifp = HexBin(inp)
    finfo = ifp.FInfo
    if not out:
        out = ifp.FName

with io.open(out, 'wb') as ofp:
        # XXXX Do translation on non-mac systems
        while True:
            d = ifp.read(128000)
            if not d: break
            ofp.write(d)
    ifp.close_data()

d = ifp.read_rsrc(128000)
    if d:
        ofp = openrsrc(out, 'wb')
        ofp.write(d)
        while True:
            d = ifp.read_rsrc(128000)
            if not d: break
            ofp.write(d)
        ofp.close()

ifp.close()

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