mirror of
https://github.com/python/cpython.git
synced 2024-12-13 11:54:54 +08:00
136 lines
2.8 KiB
Python
Executable File
136 lines
2.8 KiB
Python
Executable File
#! /usr/bin/env python
|
|
|
|
# Conversions to/from quoted-printable transport encoding as per RFC-1521
|
|
# (Dec 1991 version).
|
|
|
|
ESCAPE = '='
|
|
MAXLINESIZE = 76
|
|
HEX = '0123456789ABCDEF'
|
|
|
|
def needsquoting(c, quotetabs):
|
|
if c == '\t':
|
|
return not quotetabs
|
|
return c == ESCAPE or not(' ' <= c <= '~')
|
|
|
|
def quote(c):
|
|
if c == ESCAPE:
|
|
return ESCAPE * 2
|
|
else:
|
|
i = ord(c)
|
|
return ESCAPE + HEX[i/16] + HEX[i%16]
|
|
|
|
def encode(input, output, quotetabs):
|
|
while 1:
|
|
line = input.readline()
|
|
if not line: break
|
|
new = ''
|
|
last = line[-1:]
|
|
if last == '\n': line = line[:-1]
|
|
else: last = ''
|
|
prev = ''
|
|
for c in line:
|
|
if needsquoting(c, quotetabs):
|
|
c = quote(c)
|
|
if len(new) + len(c) >= MAXLINESIZE:
|
|
output.write(new + ESCAPE + '\n')
|
|
new = ''
|
|
new = new + c
|
|
prev = c
|
|
if prev in (' ', '\t'):
|
|
output.write(new + ESCAPE + '\n\n')
|
|
else:
|
|
output.write(new + '\n')
|
|
|
|
def decode(input, output):
|
|
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'):
|
|
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 ishex(c):
|
|
return '0' <= c <= '9' or 'a' <= c <= 'f' or 'A' <= c <= 'F'
|
|
|
|
def unhex(s):
|
|
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 test():
|
|
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__':
|
|
test()
|