two mime encoding schemes

1 files changed, 101 insertions, 0 deletions

diff --git a/Lib/quopri.py b/Lib/quopri.py
new file mode 100755
index 0000000..4c39228
--- /dev/null
+++ b/Lib/quopri.py
@@ -0,0 +1,101 @@
+# Conversions to/from quoted-printable transport encoding as per RFC-XXXX
+# (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
+	if sys.argv[1:]:
+		if sys.argv[1] == '-t': # Quote tabs
+			encode(sys.stdin, sys.stdout, 1)
+		else:
+			decode(sys.stdin, sys.stdout)
+	else:
+		encode(sys.stdin, sys.stdout, 0)
+
+if __name__ == '__main__':
+	main()