1 files changed, 55 insertions, 0 deletions
diff --git a/lib/base64.rb b/lib/base64.rb
new file mode 100644
index 0000000000..a6bf1adf92
--- /dev/null
+++ b/lib/base64.rb
@@ -0,0 +1,55 @@
+def decode64(str)
+  e = -1;
+  c = ","
+  string=''
+  for line in str.split("\n")
+    line.sub!(/=+$/, '')
+    line.tr! 'A-Za-z0-9+/', "\000-\377"
+    line.each_byte { |ch|
+      n +=1
+      e +=1
+      if e==0
+	c = ch << 2
+      elsif e==1
+	c |= ch >>4
+	string += [c].pack('c')
+	c = ch << 4
+      elsif e == 2
+	c |= ch >> 2
+	string += [c].pack('c'); 
+	c = ch << 6
+      elsif e==3
+	c |= ch
+	string += [c].pack('c')
+	e = -1
+      end
+    }
+  end
+  return string
+end
+
+def j2e(str)
+  while str =~ /\033\$B([^\033]*)\033\(B/
+    s = $1
+    pre, post = $`, $'
+    s.gsub!(/./) { |ch|
+      (ch[0]|0x80).chr
+    }
+    str = pre + s + post
+ end
+#  str.gsub!(/\033\$B([^\033]*)\033\(B/) {
+#    $1.gsub!(/./) { |ch|
+#      (ch[0]|0x80).chr
+#    }
+#  }
+  str
+end
+
+def decode_b(str)
+  str.gsub!(/=\?ISO-2022-JP\?B\?([!->@-~]+)\?=/) {
+    decode64($1)
+  }
+  str.gsub!(/\n/, ' ') 
+  str.gsub!(/\0/, '')
+  j2e(str)
+end