quopri.py :  » Mobile » Python-for-PalmOS » Python-1.5.2+reduced-1.0 » Lib » Python Open Source

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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Lib » quopri.py
#! /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):
  """Decide whether a particular character needs to be quoted.

  The 'quotetabs' flag indicates whether tabs should be quoted."""
  if c == '\t':
    return not quotetabs
  return c == ESCAPE or not(' ' <= c <= '~')

def quote(c):
  """Quote a single character."""
  if c == ESCAPE:
    return ESCAPE * 2
  else:
    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 tabs should be quoted."""
  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):
  """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'):
        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 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 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()
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