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Merged in Jack's fixes. This brings some lines beyond 79 chars again; 

I'll clean that up later.  Also corrected a mistake introduced by the
previous reformatting: an 'else' belonging to a 'for' was accidentally
reindented to belong to the 'if' inside the 'for'.  Note that the
module uses inconsistent indentation -- most code is indented with 8
spaces, but some of the reformatted code uses 4 spaces.  I'll fix this
later in the promised cleanup pass.
This commit is contained in:
Guido van Rossum 1997-02-11 16:39:31 +00:00
parent 838cb28290
commit 50b82e8e18
1 changed files with 32 additions and 17 deletions
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45
Lib/binhex.py
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@ -336,28 +336,36 @@ class _Rledecoderengine:
return rv
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.
#
self.pre_buffer = self.pre_buffer + self.ifp.read(wtd+2)
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 = ''
return
lastrle = string.rfind(self.pre_buffer, RUNCHAR)
if lastrle > 0 and lastrle == len(self.pre_buffer)-1:
# Last byte is an RLE, keep two bytes
mark = len(self.pre_buffer)-2
elif lastrle > 0 and lastrle == len(self.pre_buffer)-2:
# second-last byte is an RLE. Decode all.
#
# 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 + '\0' + RUNCHAR:
mark = mark - 3
elif self.pre_buffer[-1] == RUNCHAR:
mark = mark - 2
elif self.pre_buffer[-2:] == RUNCHAR + '\0':
mark = mark - 2
elif self.pre_buffer[-2] == RUNCHAR:
pass # Decode all
else:
mark = len(self.pre_buffer)-1
mark = mark - 1
self.post_buffer = self.post_buffer + \
binascii.rledecode_hqx(self.pre_buffer[:mark])
self.pre_buffer = self.pre_buffer[mark:]
@ -376,6 +384,10 @@ class HexBin:
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 == '\r':
continue
if ch == ':':
break
if ch != '\n':
@ -429,8 +441,11 @@ class HexBin:
n = min(n, self.dlen)
else:
n = self.dlen
rv = ''
while len(rv) < n:
rv = rv + self._read(n-len(rv))
self.dlen = self.dlen - n
return self._read(n)
return rv
def close_data(self):
if self.state != _DID_HEADER: