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executable file 448 lines (359 sloc) 8.937 kb
#
# encode.rb
#
# Copyright (c) 1998-2003 Minero Aoki <aamine@loveruby.net>
#
# This program is free software.
# You can distribute/modify this program under the terms of
# the GNU Lesser General Public License version 2 or later.
#
require 'nkf'
require 'tmail/base64.rb'
require 'tmail/stringio'
require 'tmail/utils'
module TMail
module StrategyInterface
def create_dest( obj )
case obj
when nil
StringOutput.new
when String
StringOutput.new(obj)
when IO, StringOutput
obj
else
raise TypeError, 'cannot handle this type of object for dest'
end
end
module_function :create_dest
def encoded( eol = "\r\n", charset = 'j', dest = nil )
accept_strategy Encoder, eol, charset, dest
end
def decoded( eol = "\n", charset = 'e', dest = nil )
accept_strategy Decoder, eol, charset, dest
end
alias to_s decoded
def accept_strategy( klass, eol, charset, dest = nil )
dest ||= ''
accept klass.new(create_dest(dest), charset, eol)
dest
end
end
###
### MIME B encoding decoder
###
class Decoder
include TextUtils
encoded = '=\?(?:iso-2022-jp|euc-jp|shift_jis)\?[QB]\?[a-z0-9+/=]+\?='
ENCODED_WORDS = /#{encoded}(?:\s+#{encoded})*/i
OUTPUT_ENCODING = {
'EUC' => 'e',
'SJIS' => 's',
}
def self.decode( str, encoding = nil )
encoding ||= (OUTPUT_ENCODING[$KCODE] || 'j')
opt = '-m' + encoding
str.gsub(ENCODED_WORDS) {|s| NKF.nkf(opt, s) }
end
def initialize( dest, encoding = nil, eol = "\n" )
@f = StrategyInterface.create_dest(dest)
@encoding = (/\A[ejs]/ === encoding) ? encoding[0,1] : nil
@eol = eol
end
def decode( str )
self.class.decode(str, @encoding)
end
private :decode
def terminate
end
def header_line( str )
@f << decode(str)
end
def header_name( nm )
@f << nm << ': '
end
def header_body( str )
@f << decode(str)
end
def space
@f << ' '
end
alias spc space
def lwsp( str )
@f << str
end
def meta( str )
@f << str
end
def text( str )
@f << decode(str)
end
def phrase( str )
@f << quote_phrase(decode(str))
end
def kv_pair( k, v )
@f << k << '=' << v
end
def puts( str = nil )
@f << str if str
@f << @eol
end
def write( str )
@f << str
end
end
###
### MIME B-encoding encoder
###
#
# FIXME: This class can handle only (euc-jp/shift_jis -> iso-2022-jp).
#
class Encoder
include TextUtils
BENCODE_DEBUG = false unless defined?(BENCODE_DEBUG)
def Encoder.encode( str )
e = new()
e.header_body str
e.terminate
e.dest.string
end
SPACER = "\t"
MAX_LINE_LEN = 70
OPTIONS = {
'EUC' => '-Ej -m0',
'SJIS' => '-Sj -m0',
'UTF8' => nil, # FIXME
'NONE' => nil
}
def initialize( dest = nil, encoding = nil, eol = "\r\n", limit = nil )
@f = StrategyInterface.create_dest(dest)
@opt = OPTIONS[$KCODE]
@eol = eol
reset
end
def normalize_encoding( str )
if @opt
then NKF.nkf(@opt, str)
else str
end
end
def reset
@text = ''
@lwsp = ''
@curlen = 0
end
def terminate
add_lwsp ''
reset
end
def dest
@f
end
def puts( str = nil )
@f << str if str
@f << @eol
end
def write( str )
@f << str
end
#
# add
#
def header_line( line )
scanadd line
end
def header_name( name )
add_text name.split(/-/).map {|i| i.capitalize }.join('-')
add_text ':'
add_lwsp ' '
end
def header_body( str )
scanadd normalize_encoding(str)
end
def space
add_lwsp ' '
end
alias spc space
def lwsp( str )
add_lwsp str.sub(/[\r\n]+[^\r\n]*\z/, '')
end
def meta( str )
add_text str
end
def text( str )
scanadd normalize_encoding(str)
end
def phrase( str )
str = normalize_encoding(str)
if CONTROL_CHAR === str
scanadd str
else
add_text quote_phrase(str)
end
end
# FIXME: implement line folding
#
def kv_pair( k, v )
v = normalize_encoding(v)
if token_safe?(v)
add_text k + '=' + v
elsif not CONTROL_CHAR === v
add_text k + '=' + quote_token(v)
else
# apply RFC2231 encoding
kv = k + '*=' + "iso-2022-jp'ja'" + encode_value(v)
add_text kv
end
end
def encode_value( str )
str.gsub(TOKEN_UNSAFE) {|s| '%%%02x' % s[0] }
end
private
def scanadd( str, force = false )
types = ''
strs = []
until str.empty?
if m = /\A[^\e\t\r\n ]+/.match(str)
types << (force ? 'j' : 'a')
strs.push m[0]
elsif m = /\A[\t\r\n ]+/.match(str)
types << 's'
strs.push m[0]
elsif m = /\A\e../.match(str)
esc = m[0]
str = m.post_match
if esc != "\e(B" and m = /\A[^\e]+/.match(str)
types << 'j'
strs.push m[0]
end
else
raise 'TMail FATAL: encoder scan fail'
end
(str = m.post_match) unless m.nil?
end
do_encode types, strs
end
def do_encode( types, strs )
#
# result : (A|E)(S(A|E))*
# E : W(SW)*
# W : (J|A)+ but must contain J # (J|A)*J(J|A)*
# A : <<A character string not to be encoded>>
# J : <<A character string to be encoded>>
# S : <<LWSP>>
#
# An encoding unit is `E'.
# Input (parameter `types') is (J|A)(J|A|S)*(J|A)
#
if BENCODE_DEBUG
puts
puts '-- do_encode ------------'
puts types.split(//).join(' ')
p strs
end
e = /[ja]*j[ja]*(?:s[ja]*j[ja]*)*/
while m = e.match(types)
pre = m.pre_match
concat_A_S pre, strs[0, pre.size] unless pre.empty?
concat_E m[0], strs[m.begin(0) ... m.end(0)]
types = m.post_match
strs.slice! 0, m.end(0)
end
concat_A_S types, strs
end
def concat_A_S( types, strs )
i = 0
types.each_byte do |t|
case t
when ?a then add_text strs[i]
when ?s then add_lwsp strs[i]
else
raise "TMail FATAL: unknown flag: #{t.chr}"
end
i += 1
end
end
METHOD_ID = {
?j => :extract_J,
?e => :extract_E,
?a => :extract_A,
?s => :extract_S
}
def concat_E( types, strs )
if BENCODE_DEBUG
puts '---- concat_E'
puts "types=#{types.split(//).join(' ')}"
puts "strs =#{strs.inspect}"
end
flush() unless @text.empty?
chunk = ''
strs.each_with_index do |s,i|
mid = METHOD_ID[types[i]]
until s.empty?
unless c = __send__(mid, chunk.size, s)
add_with_encode chunk unless chunk.empty?
flush
chunk = ''
fold
c = __send__(mid, 0, s)
raise 'TMail FATAL: extract fail' unless c
end
chunk << c
end
end
add_with_encode chunk unless chunk.empty?
end
def extract_J( chunksize, str )
size = max_bytes(chunksize, str.size) - 6
size = (size % 2 == 0) ? (size) : (size - 1)
return nil if size <= 0
"\e$B#{str.slice!(0, size)}\e(B"
end
def extract_A( chunksize, str )
size = max_bytes(chunksize, str.size)
return nil if size <= 0
str.slice!(0, size)
end
alias extract_S extract_A
def max_bytes( chunksize, ssize )
(restsize() - '=?iso-2022-jp?B??='.size) / 4 * 3 - chunksize
end
#
# free length buffer
#
def add_text( str )
@text << str
# puts '---- text -------------------------------------'
# puts "+ #{str.inspect}"
# puts "txt >>>#{@text.inspect}<<<"
end
def add_with_encode( str )
@text << "=?iso-2022-jp?B?#{Base64.encode(str)}?="
end
def add_lwsp( lwsp )
# puts '---- lwsp -------------------------------------'
# puts "+ #{lwsp.inspect}"
fold if restsize() <= 0
flush
@lwsp = lwsp
end
def flush
# puts '---- flush ----'
# puts "spc >>>#{@lwsp.inspect}<<<"
# puts "txt >>>#{@text.inspect}<<<"
@f << @lwsp << @text
@curlen += (@lwsp.size + @text.size)
@text = ''
@lwsp = ''
end
def fold
# puts '---- fold ----'
@f << @eol
@curlen = 0
@lwsp = SPACER
end
def restsize
MAX_LINE_LEN - (@curlen + @lwsp.size + @text.size)
end
end
end # module TMail
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