"""Macintosh binhex compression/decompression.
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...
__all__ = ["binhex","hexbin","Error"]
# States (what have we written)
REASONABLY_LARGE=32768 # Minimal amount we pass the rle-coder
RUNCHAR=chr(0x90) # run-length introducer
# This code is no longer byte-order dependent
# Workarounds for non-mac machines.
from Carbon.File import FSSpec, FInfo
finfo = FSSpec(name).FSpGetFInfo()
dir, file = os.path.split(name)
# XXX Get resource/data sizes
return file, finfo, dlen, rlen
def openrsrc(name, *mode):
return openrf(name, mode)
# Glue code for non-macintosh usage
# Quick check for textfile
data = open(name).read(256)
if not c.isspace() and (c<' ' or ord(c) > 0x7f):
dir, file = os.path.split(name)
file = file.replace(':', '-', 1)
return file, finfo, dsize, 0
def __init__(self, *args):
"""Write data to the coder in 3-byte chunks"""
self.data = self.data + data
self.data = self.data[todo:]
self.hqxdata = self.hqxdata + binascii.b2a_hqx(data)
while first <= len(self.hqxdata)-self.linelen:
last = first + self.linelen
self.ofp.write(self.hqxdata[first:last]+'\n')
self.hqxdata = self.hqxdata[first:]
self.ofp.write(self.hqxdata + ':\n')
self.hqxdata + binascii.b2a_hqx(self.data)
"""Write data to the RLE-coder in suitably large chunks"""
self.data = self.data + data
if len(self.data) < REASONABLY_LARGE:
rledata = binascii.rlecode_hqx(self.data)
rledata = binascii.rlecode_hqx(self.data)
def __init__(self, name_finfo_dlen_rlen, ofp):
name, finfo, dlen, rlen = name_finfo_dlen_rlen
if type(ofp) == type(''):
ofp.write('(This file must be converted with BinHex 4.0)\n\n:')
hqxer = _Hqxcoderengine(ofp)
self.ofp = _Rlecoderengine(hqxer)
self._writeinfo(name, finfo)
def _writeinfo(self, name, finfo):
raise Error, 'Filename too long'
d = chr(nl) + name + '\0'
d2 = finfo.Type + finfo.Creator
# Force all structs to be packed with big-endian
d3 = struct.pack('>h', finfo.Flags)
d4 = struct.pack('>ii', self.dlen, self.rlen)
self.crc = binascii.crc_hqx(data, self.crc)
# XXXX Should this be here??
# self.crc = binascii.crc_hqx('\0\0', self.crc)
self.ofp.write(struct.pack(fmt, self.crc))
if self.state != _DID_HEADER:
raise Error, 'Writing data at the wrong time'
self.dlen = self.dlen - len(data)
raise Error, 'Incorrect data size, diff=%r' % (self.rlen,)
def write_rsrc(self, data):
if self.state < _DID_DATA:
if self.state != _DID_DATA:
raise Error, 'Writing resource data at the wrong time'
self.rlen = self.rlen - len(data)
if self.state < _DID_DATA:
if self.state != _DID_DATA:
raise Error, 'Close at the wrong time'
"Incorrect resource-datasize, diff=%r" % (self.rlen,)
"""(infilename, outfilename) - Create binhex-encoded copy of a file"""
# XXXX Do textfile translation on non-mac systems
ifp = openrsrc(inp, 'rb')
"""Read data via the decoder in 4-byte chunks"""
def read(self, totalwtd):
"""Read at least wtd bytes (or until EOF)"""
# The loop here is convoluted, since we don't really now how
# much to decode: there may be newlines in the incoming data.
if self.eof: return decdata
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
except binascii.Incomplete:
newdata = self.ifp.read(1)
'Premature EOF on binhex file'
decdata = decdata + decdatacur
wtd = totalwtd - len(decdata)
if not decdata and not self.eof:
raise Error, 'Premature EOF on binhex file'
"""Read data via the RLE-coder"""
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:]
self.pre_buffer = self.pre_buffer + self.ifp.read(wtd+4)
self.post_buffer = self.post_buffer + \
binascii.rledecode_hqx(self.pre_buffer)
# 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
# '\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 + '\0' + RUNCHAR:
elif self.pre_buffer[-1] == RUNCHAR:
elif self.pre_buffer[-2:] == RUNCHAR + '\0':
elif self.pre_buffer[-2] == RUNCHAR:
self.post_buffer = self.post_buffer + \
binascii.rledecode_hqx(self.pre_buffer[:mark])
self.pre_buffer = self.pre_buffer[mark:]
if type(ifp) == type(''):
raise Error, "No binhex data found"
# Cater for \r\n terminated lines (which show up as \n\r, hence
# all lines start with \r)
hqxifp = _Hqxdecoderengine(ifp)
self.ifp = _Rledecoderengine(hqxifp)
data = self.ifp.read(len)
self.crc = binascii.crc_hqx(data, self.crc)
filecrc = struct.unpack('>h', self.ifp.read(2))[0] & 0xffff
#self.crc = binascii.crc_hqx('\0\0', self.crc)
self.crc = self.crc & 0xffff
raise Error, 'CRC error, computed %x, read %x' \
fname = self._read(ord(len))
rest = self._read(1+4+4+2+4+4)
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.FInfo.Creator = creator
if self.state != _DID_HEADER:
raise Error, 'Read data at wrong time'
rv = rv + self._read(n-len(rv))
self.dlen = self.dlen - n
if self.state != _DID_HEADER:
raise Error, 'close_data at wrong time'
dummy = self._read(self.dlen)
if self.state == _DID_HEADER:
if self.state != _DID_DATA:
raise Error, 'Read resource data at wrong time'
self.rlen = self.rlen - n
dummy = self.read_rsrc(self.rlen)
"""(infilename, outfilename) - Decode binhexed file"""
# XXXX Do translation on non-mac systems
d = ifp.read_rsrc(128000)
ofp = openrsrc(out, 'wb')
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
