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v0.5.1
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Revision 785261684e0e660dcdce48daf683cec541f4a8f2 authored by Tim Peters on 05 September 2001, 00:53:45 UTC, committed by Tim Peters on 05 September 2001, 00:53:45 UTC
getting Infs, NaNs, or nonsense in 2.1 and before; in yesterday's CVS we were getting OverflowError; but these functions always make good sense for positive arguments, no matter how large).
1 parent 63c9453
Tip revision: 785261684e0e660dcdce48daf683cec541f4a8f2 authored by Tim Peters on 05 September 2001, 00:53:45 UTC
Return reasonable results for math.log(long) and math.log10(long) (we were
Return reasonable results for math.log(long) and math.log10(long) (we were
Tip revision: 7852616
quopri.py
#! /usr/bin/env python
"""Conversions to/from quoted-printable transport encoding as per RFC 1521."""
# (Dec 1991 version).
__all__ = ["encode", "decode", "encodestring", "decodestring"]
ESCAPE = '='
MAXLINESIZE = 76
HEX = '0123456789ABCDEF'
EMPTYSTRING = ''
def needsquoting(c, quotetabs):
"""Decide whether a particular character needs to be quoted.
The 'quotetabs' flag indicates whether embedded tabs and spaces should be
quoted. Note that line-ending tabs and spaces are always encoded, as per
RFC 1521.
"""
if c in ' \t':
return quotetabs
return c == ESCAPE or not (' ' <= c <= '~')
def quote(c):
"""Quote a single character."""
i = ord(c)
return ESCAPE + HEX[i//16] + HEX[i%16]
def encode(input, output, quotetabs):
"""Read 'input', apply quoted-printable encoding, and write to 'output'.
'input' and 'output' are files with readline() and write() methods.
The 'quotetabs' flag indicates whether embedded tabs and spaces should be
quoted. Note that line-ending tabs and spaces are always encoded, as per
RFC 1521.
"""
def write(s, output=output, lineEnd='\n'):
# RFC 1521 requires that the line ending in a space or tab must have
# that trailing character encoded.
if s and s[-1:] in ' \t':
output.write(s[:-1] + quote(s[-1]) + lineEnd)
else:
output.write(s + lineEnd)
prevline = None
while 1:
line = input.readline()
if not line:
break
outline = []
# Strip off any readline induced trailing newline
stripped = ''
if line[-1:] == '\n':
line = line[:-1]
stripped = '\n'
# Calculate the un-length-limited encoded line
for c in line:
if needsquoting(c, quotetabs):
c = quote(c)
outline.append(c)
# First, write out the previous line
if prevline is not None:
write(prevline)
# Now see if we need any soft line breaks because of RFC-imposed
# length limitations. Then do the thisline->prevline dance.
thisline = EMPTYSTRING.join(outline)
while len(thisline) > MAXLINESIZE:
# Don't forget to include the soft line break `=' sign in the
# length calculation!
write(thisline[:MAXLINESIZE-1], lineEnd='=\n')
thisline = thisline[MAXLINESIZE-1:]
# Write out the current line
prevline = thisline
# Write out the last line, without a trailing newline
if prevline is not None:
write(prevline, lineEnd=stripped)
def encodestring(s, quotetabs=0):
from cStringIO import StringIO
infp = StringIO(s)
outfp = StringIO()
encode(infp, outfp, quotetabs)
return outfp.getvalue()
def decode(input, output):
"""Read 'input', apply quoted-printable decoding, and write to 'output'.
'input' and 'output' are files with readline() and write() methods."""
new = ''
while 1:
line = input.readline()
if not line: break
i, n = 0, len(line)
if n > 0 and line[n-1] == '\n':
partial = 0; n = n-1
# Strip trailing whitespace
while n > 0 and line[n-1] in " \t\r":
n = n-1
else:
partial = 1
while i < n:
c = line[i]
if c != ESCAPE:
new = new + c; i = i+1
elif i+1 == n and not partial:
partial = 1; break
elif i+1 < n and line[i+1] == ESCAPE:
new = new + ESCAPE; i = i+2
elif i+2 < n and ishex(line[i+1]) and ishex(line[i+2]):
new = new + chr(unhex(line[i+1:i+3])); i = i+3
else: # Bad escape sequence -- leave it in
new = new + c; i = i+1
if not partial:
output.write(new + '\n')
new = ''
if new:
output.write(new)
def decodestring(s):
from cStringIO import StringIO
infp = StringIO(s)
outfp = StringIO()
decode(infp, outfp)
return outfp.getvalue()
# Other helper functions
def ishex(c):
"""Return true if the character 'c' is a hexadecimal digit."""
return '0' <= c <= '9' or 'a' <= c <= 'f' or 'A' <= c <= 'F'
def unhex(s):
"""Get the integer value of a hexadecimal number."""
bits = 0
for c in s:
if '0' <= c <= '9':
i = ord('0')
elif 'a' <= c <= 'f':
i = ord('a')-10
elif 'A' <= c <= 'F':
i = ord('A')-10
else:
break
bits = bits*16 + (ord(c) - i)
return bits
def main():
import sys
import getopt
try:
opts, args = getopt.getopt(sys.argv[1:], 'td')
except getopt.error, msg:
sys.stdout = sys.stderr
print msg
print "usage: quopri [-t | -d] [file] ..."
print "-t: quote tabs"
print "-d: decode; default encode"
sys.exit(2)
deco = 0
tabs = 0
for o, a in opts:
if o == '-t': tabs = 1
if o == '-d': deco = 1
if tabs and deco:
sys.stdout = sys.stderr
print "-t and -d are mutually exclusive"
sys.exit(2)
if not args: args = ['-']
sts = 0
for file in args:
if file == '-':
fp = sys.stdin
else:
try:
fp = open(file)
except IOError, msg:
sys.stderr.write("%s: can't open (%s)\n" % (file, msg))
sts = 1
continue
if deco:
decode(fp, sys.stdout)
else:
encode(fp, sys.stdout, tabs)
if fp is not sys.stdin:
fp.close()
if sts:
sys.exit(sts)
if __name__ == '__main__':
main()
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