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Diffstat (limited to 'webmail/program/lib/utf7.inc')
| -rw-r--r-- | webmail/program/lib/utf7.inc | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/webmail/program/lib/utf7.inc b/webmail/program/lib/utf7.inc new file mode 100644 index 0000000..d2068be --- /dev/null +++ b/webmail/program/lib/utf7.inc @@ -0,0 +1,249 @@ +<?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; +} + +?> |