As per GvR recomendations, remove the restriction that binhex only run on

big-endian machines.  This is done by directing the struct module's pack
and unpack methods to treat the data always in bin endian format.
This has been tested on irix (big endian) and solaris x86 (little endian)
but not yet on the mac.

1 files changed, 43 insertions, 33 deletions

diff --git a/Lib/binhex.py b/Lib/binhex.py
index cdb961e..1d2ba2a 100644
--- a/Lib/binhex.py
+++ b/Lib/binhex.py
@@ -14,8 +14,8 @@ hexbin(inputfilename, outputfilename)
 # (we should probably use ISO-Latin-1 on all but the mac platform).
 # XXXX The simeple 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 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...
@@ -37,9 +37,7 @@ LINELEN=64
 RUNCHAR=chr(0x90)	# run-length introducer
 
 #
-# The code is currently byte-order dependent
-if struct.pack('i', 0177) != '\0\0\0\177':
-	raise ImportError, 'Module binhex is big-endian only'
+# This code is no longer byte-order dependent
 
 #
 # Workarounds for non-mac machines.
@@ -92,9 +90,10 @@ else:
 		fp = open(name)
 		data = open(name).read(256)
 		for c in data:
-			if not c in string.whitespace and (c<' ' or ord(c) > 0177):
-				break
-		else:
+		    if not c in string.whitespace \
+			and (c<' ' or ord(c) > 0177):
+			break
+		    else:
 			finfo.Type = 'TEXT'
 		fp.seek(0, 2)
 		dsize = fp.tell()
@@ -149,7 +148,8 @@ class _Hqxcoderengine:
 
 	def close(self):
 		if self.data:
-			self.hqxdata = self.hqxdata + binascii.b2a_hqx(self.data)
+			self.hqxdata = \
+			     self.hqxdata + binascii.b2a_hqx(self.data)
 		self._flush(1)
 		self.ofp.close()
 		del self.ofp
@@ -202,8 +202,10 @@ class BinHex:
 			raise Error, 'Filename too long'
 		d = chr(nl) + name + '\0'
 		d2 = finfo.Type + finfo.Creator
-		d3 = struct.pack('h', finfo.Flags)
-		d4 = struct.pack('ii', self.dlen, self.rlen)
+
+		# 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()
@@ -213,9 +215,10 @@ class BinHex:
 		self.ofp.write(data)
 
 	def _writecrc(self):
-##		self.crc = binascii.crc_hqx('\0\0', self.crc) # XXXX Should this be here??
-		self.ofp.write(struct.pack('h', self.crc))
-		self.crc = 0
+	    # XXXX Should this be here??
+	    # self.crc = binascii.crc_hqx('\0\0', self.crc)
+	    self.ofp.write(struct.pack('>h', self.crc))
+	    self.crc = 0
 
 	def write(self, data):
 		if self.state != _DID_HEADER:
@@ -243,7 +246,8 @@ class BinHex:
 		if self.state != _DID_DATA:
 			raise Error, 'Close at the wrong time'
 		if self.rlen <> 0:
-			raise Error, "Incorrect resource-datasize, diff="+`self.rlen`
+			raise Error, \
+			      "Incorrect resource-datasize, diff="+`self.rlen`
 		self._writecrc()
 		self.ofp.close()
 		self.state = None
@@ -283,25 +287,28 @@ class _Hqxdecoderengine:
 		decdata = ''
 		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.
+		# 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.
+			# Next problem: there may not be a complete number of
+			# bytes in what we pass to a2b. Solve by yet another
+			# loop.
 			#
 			while 1:
 				try:
-					decdatacur, self.eof = binascii.a2b_hqx(data)
+					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'
+					raise Error, \
+					      'Premature EOF on binhex file'
 				data = data + newdata
 			decdata = decdata + decdatacur
 			wtd = totalwtd - len(decdata)
@@ -330,9 +337,10 @@ class _Rledecoderengine:
 
 	def _fill(self, wtd):
 		#
-		# Obfuscated code ahead. We keep at least one byte in the pre_buffer,
-		# so we don't stumble over an orphaned RUNCHAR later on. If the
-		# last or second-last char is a RUNCHAR we keep more bytes.
+		# Obfuscated code ahead. We keep at least one byte in the
+		# pre_buffer, so we don't stumble over an orphaned RUNCHAR
+		# later on. If the last or second-last char is a RUNCHAR
+		# we keep more bytes.
 		#
 		self.pre_buffer = self.pre_buffer + self.ifp.read(wtd+2)
 		if self.ifp.eof:
@@ -384,11 +392,13 @@ class HexBin:
 		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??
+		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)
+			raise Error, 'CRC error, computed %x, read %x' \
+			      %(self.crc, filecrc)
 		self.crc = 0
 
 	def _readheader(self):
@@ -399,9 +409,9 @@ class HexBin:
 		
 		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]
+		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()
@@ -496,9 +506,9 @@ def _test():
 		fname = fss.as_pathname()
 	else:
 		fname = sys.argv[1]
-	#binhex(fname, fname+'.hqx')
-	#hexbin(fname+'.hqx', fname+'.viahqx')
-	hexbin(fname, fname+'.unpacked')
+	binhex(fname, fname+'.hqx')
+	hexbin(fname+'.hqx', fname+'.viahqx')
+	#hexbin(fname, fname+'.unpacked')
 	sys.exit(1)
 	
 if __name__ == '__main__':