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<?php
/*
* Copyright (C) 2000 Edmund Grimley Evans <edmundo@rano.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com>
*/
/**
* Convert the data ($str) from RFC 2060's UTF-7 to UTF-8.
* If input data is invalid, return the original input string.
* RFC 2060 obviously intends the encoding to be unique (see
* point 5 in section 5.1.3), so we reject any non-canonical
* form, such as &ACY- (instead of &-) or &AMA-&AMA- (instead
* of &AMAAwA-).
*/
function utf7_to_utf8($str)
{
$Index_64 = array(
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, 63,-1,-1,-1,
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
);
$u7len = strlen($str);
$str = strval($str);
$p = $err = '';
for ($i=0; $u7len > 0; $i++, $u7len--)
{
$u7 = $str[$i];
if ($u7 == '&')
{
$i++;
$u7len--;
$u7 = $str[$i];
if ($u7len && $u7 == '-')
{
$p .= '&';
continue;
}
$ch = 0;
$k = 10;
for (; $u7len > 0; $i++, $u7len--)
{
$u7 = $str[$i];
if ((ord($u7) & 0x80) || ($b = $Index_64[ord($u7)]) == -1)
break;
if ($k > 0)
{
$ch |= $b << $k;
$k -= 6;
}
else
{
$ch |= $b >> (-$k);
if ($ch < 0x80)
{
/* Printable US-ASCII */
if (0x20 <= $ch && $ch < 0x7f)
return $err;
$p .= chr($ch);
}
else if ($ch < 0x800)
{
$p .= chr(0xc0 | ($ch >> 6));
$p .= chr(0x80 | ($ch & 0x3f));
}
else
{
$p .= chr(0xe0 | ($ch >> 12));
$p .= chr(0x80 | (($ch >> 6) & 0x3f));
$p .= chr(0x80 | ($ch & 0x3f));
}
$ch = ($b << (16 + $k)) & 0xffff;
$k += 10;
}
}
/* Non-zero or too many extra bits */
if ($ch || $k < 6)
return $err;
/* BASE64 not properly terminated */
if (!$u7len || $u7 != '-')
return $err;
/* Adjacent BASE64 sections */
if ($u7len > 2 && $str[$i+1] == '&' && $str[$i+2] != '-')
return $err;
}
/* Not printable US-ASCII */
else if (ord($u7) < 0x20 || ord($u7) >= 0x7f)
return $err;
else
$p .= $u7;
}
return $p;
}
/**
* Convert the data ($str) from UTF-8 to RFC 2060's UTF-7.
* Unicode characters above U+FFFF are replaced by U+FFFE.
* If input data is invalid, return an empty string.
*/
function utf8_to_utf7($str)
{
$B64Chars = array(
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '+', ','
);
$u8len = strlen($str);
$base64 = $i = 0;
$p = $err = '';
while ($u8len)
{
$u8 = $str[$i];
$c = ord($u8);
if ($c < 0x80)
{
$ch = $c;
$n = 0;
}
else if ($c < 0xc2)
return $err;
else if ($c < 0xe0)
{
$ch = $c & 0x1f;
$n = 1;
}
else if ($c < 0xf0)
{
$ch = $c & 0x0f;
$n = 2;
}
else if ($c < 0xf8)
{
$ch = $c & 0x07;
$n = 3;
}
else if ($c < 0xfc)
{
$ch = $c & 0x03;
$n = 4;
}
else if ($c < 0xfe)
{
$ch = $c & 0x01;
$n = 5;
}
else
return $err;
$i++;
$u8len--;
if ($n > $u8len)
return $err;
for ($j=0; $j < $n; $j++)
{
$o = ord($str[$i+$j]);
if (($o & 0xc0) != 0x80)
return $err;
$ch = ($ch << 6) | ($o & 0x3f);
}
if ($n > 1 && !($ch >> ($n * 5 + 1)))
return $err;
$i += $n;
$u8len -= $n;
if ($ch < 0x20 || $ch >= 0x7f)
{
if (!$base64)
{
$p .= '&';
$base64 = 1;
$b = 0;
$k = 10;
}
if ($ch & ~0xffff)
$ch = 0xfffe;
$p .= $B64Chars[($b | $ch >> $k)];
$k -= 6;
for (; $k >= 0; $k -= 6)
$p .= $B64Chars[(($ch >> $k) & 0x3f)];
$b = ($ch << (-$k)) & 0x3f;
$k += 16;
}
else
{
if ($base64)
{
if ($k > 10)
$p .= $B64Chars[$b];
$p .= '-';
$base64 = 0;
}
$p .= chr($ch);
if (chr($ch) == '&')
$p .= '-';
}
}
if ($base64)
{
if ($k > 10)
$p .= $B64Chars[$b];
$p .= '-';
}
return $p;
}
?>
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