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utf7.inc
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utf7.inc
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<?php
//
//
// utf7.inc - Routines to encode bytes to UTF7 and decode UTF7 strings
//
// Copyright (C) 1999, 2002 Ziberex and Torben Rybner
//
//
// Version 1.01 2002-06-08 19:00
//
// - Adapted for use in IlohaMail (modified UTF-7 decoding)
// - Converted from C to PHP4
//
//
// Version 1.00 1999-09-03 19:00
//
// - Encodes bytes to UTF7 strings
// *OutString = '\0';
// StartBase64Encode();
// for (CP = InString; *CP; CP++)
// strcat(OutString, Base64Encode(*CP));
// strcat(OutString, StopBase64Encode());
// - Decodes Base64 strings to bytes
// StartBase64Decode();
// for (CP1 = InString, CP2 = OutString; *CP1 && (*CP1 != '='); CP1++)
// CP2 += Base64Decode(*CP1, CP2);
// StopBase64Decode();
//
$BASE64LENGTH = 60;
$BASE64DECODE_NO_DATA = -1;
$BASE64DECODE_EMPTY_DATA = -2;
$BASE64DECODE_INVALID_DATA = -3;
//
//
// Used for conversion to UTF7
//
$_ToUTF7 = 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', '+', ','
);
//
//
// Used for conversion from UTF7
// (0x80 => Illegal, 0x40 => CR/LF)
//
$_FromUTF7 = array
(
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, // 00 - 07 - Ctrl -
0x80, 0x80, 0x40, 0x80, 0x80, 0x40, 0x80, 0x80, // 08 - 0F - Ctrl -
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, // 10 - 17 - Ctrl -
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, // 18 - 1F - Ctrl -
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, // 20 - 27 !"#$%&'
0x80, 0x80, 0x80, 0x3E, 0x3F, 0x80, 0x80, 0x3F, // 28 - 2F ()*+,-./
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, // 30 - 37 01234567
0x3C, 0x3D, 0x80, 0x80, 0x80, 0x00, 0x80, 0x80, // 38 - 3F 89:;<=>?
0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, // 40 - 47 @ABCDEFG
0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, // 48 - 4F HIJKLMNO
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, // 50 - 57 PQRSTUVW
0x17, 0x18, 0x19, 0x80, 0x80, 0x80, 0x80, 0x80, // 58 - 5F XYZ[\]^_
0x80, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, // 60 - 67 `abcdefg
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, // 68 - 6F hijklmno
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, // 70 - 77 pqrstuvw
0x31, 0x32, 0x33, 0x80, 0x80, 0x80, 0x80, 0x80, // 78 - 7F xyz{|}~
);
//
//
// UTF7EncodeInit:
//
// Start the encoding of bytes
//
function UTF7EncodeInit(&$Context)
{
$Context[ "Data" ] = "";
$Context[ "Count" ] = 0;
$Context[ "Pos" ] = 0;
$Context[ "State" ] = 0;
} // UTF7EncodeInit
//
//
// UTF7EncodeByte:
//
// Encodes one byte to UTF7
//
function UTF7EncodeByte(&$Context, $Byte)
{
global $_ToUTF7;
$Byte = ord($Byte);
switch ($Context[ "State" ])
{
case 0:
// Convert into a byte
$Context[ "Data" ] = $_ToUTF7[ $Byte >> 2 ];
$Context[ "Pos" ]++;
// Save residue for next converted byte
$Context[ "Residue" ] = ($Byte & 0x03) << 4;
// This is the first byte in this line
$Context[ "Count" ] = 1;
// Next state is 1
$Context[ "State" ] = 1;
break;
case 1:
// Convert into a byte
$Context[ "Data" ] .= $_ToUTF7[ $Context[ "Residue" ] | ($Byte >> 4) ];
$Context[ "Pos" ]++;
// Save residue for next converted byte
$Context[ "Residue" ] = ($Byte & 0x0F) << 2;
// Bumb byte counter
$Context[ "Count" ]++;
// Next state is 2
$Context[ "State" ] = 2;
break;
case 2:
// Convert into a byte
$Context[ "Data" ] .= $_ToUTF7[ $Context[ "Residue" ] | ($Byte >> 6) ];
$Context[ "Pos" ]++;
// Residue fits precisely into the next byte
$Context[ "Data" ] .= $_ToUTF7[ $Byte & 0x3F ];
$Context[ "Pos" ]++;
// Bumb byte counter
$Context[ "Count" ]++;
// Next state is 3
$Context[ "State" ] = 3;
break;
case 3:
// Convert into a byte
$Context[ "Data" ] .= $_ToUTF7[ $Byte >> 2 ];
$Context[ "Pos" ]++;
// Save residue for next converted byte
$Context[ "Residue" ] = ($Byte & 0x03) << 4;
// Bumb byte counter
$Context[ "Count" ]++;
// Next state is 1
$Context[ "State" ] = 1;
break;
default:
// printf("Internal error in UTF7Encode: State is %d\n", $Context[ "State" ]);
// exit(1);
break;
}
} // UTF7EncodeByte
//
//
// UTF7EncodeFinal:
//
// Terminates the encoding of bytes
//
function UTF7EncodeFinal(&$Context)
{
if ($Context[ "State" ] == 0)
return "";
if ($Context[ "State" ] != 3)
UTF7EncodeByte($Context, "\0");
return $Context[ "Data" ];
} // UTF7EncodeFinal
//
//
// UTF7EncodeString
//
// Encodes a string to modified UTF-7 format
//
function UTF7EncodeString($String)
{
// Not during encoding, yet
$Encoding = false;
// Go through the string
for ($I = 0; $I < strlen($String); $I++)
{
$Ch = substr($String, $I, 1);
if (ord($Ch) > 0x7F)
{
if (! $Encoding)
{
$RetVal .= "&";
$Encoding = true;
// Initialise UTF7 context
UTF7EncodeInit($Context);
}
UTF7EncodeByte($Context, "\0");
UTF7EncodeByte($Context, $Ch);
}
elseif ($Ch == "&")
{
if (! $Encoding)
{
$RetVal .= "&";
$Encoding = true;
// Initialise UTF7 context
UTF7EncodeInit($Context);
}
else
{
UTF7EncodeByte($Context, "\0");
UTF7EncodeByte($Context, $Ch);
}
}
else
{
if ($Encoding)
{
$RetVal .= UTF7EncodeFinal($Context) . "-$Ch";
$Encoding = false;
}
else
$RetVal .= $Ch;
}
}
if ($Encoding)
$RetVal .= UTF7EncodeFinal($Context) . "-";
return $RetVal;
} // UTF7EncodeString
//
//
// UTF7DecodeInit:
//
// Start the decoding of bytes
//
function UTF7DecodeInit(&$Context)
{
$Context[ "Data" ] = "";
$Context[ "State" ] = 0;
$Context[ "Pos" ] = 0;
} // UTF7DecodeInit
//
//
// UTF7DecodeByte:
//
// Decodes one character from UTF7
//
function UTF7DecodeByte(&$Context, $Byte)
{
global $BASE64DECODE_INVALID_DATA;
global $_FromUTF7;
// Restore bits
$Byte = $_FromUTF7[ ord($Byte) ];
// Ignore carriage returns and linefeeds
if ($Byte == 0x40)
return "";
// Invalid byte - Tell caller!
if ($Byte == 0x80)
$Context[ "Count" ] = $BASE64DECODE_INVALID_DATA;
switch ($Context[ "State" ])
{
case 0:
// Save residue
$Context[ "Residue" ] = $Byte;
// Initialise count
$Context[ "Count" ] = 0;
// Next state
$Context[ "State" ] = 1;
break;
case 1:
// Store byte
$Context[ "Data" ] .= chr(($Context[ "Residue" ] << 2) | ($Byte >> 4));
$Context[ "Pos" ]++;
// Update count
$Context[ "Count" ]++;
// Save residue
$Context[ "Residue" ] = $Byte;
// Next state
$Context[ "State" ] = 2;
break;
case 2:
// Store byte
$Context[ "Data" ] .= chr(($Context[ "Residue" ] << 4) | ($Byte >> 2));
$Context[ "Pos" ]++;
// Update count
$Context[ "Count" ]++;
// Save residue
$Context[ "Residue" ] = $Byte;
// Next state
$Context[ "State" ] = 3;
break;
case 3:
// Store byte
$Context[ "Data" ] .= chr(($Context[ "Residue" ] << 6) | $Byte);
$Context[ "Pos" ]++;
// Update count
$Context[ "Count" ]++;
// Next state
$Context[ "State" ] = 4;
break;
case 4:
// Save residue
$Context[ "Residue" ] = $Byte;
// Next state
$Context[ "State" ] = 1;
break;
}
} // UTF7DecodeByte
//
//
// UTF7DecodeFinal:
//
// Decodes one character from UTF7
//
function UTF7DecodeFinal(&$Context)
{
// Buffer not empty - Return remainder!
if ($Context[ "Count" ])
{
$Context[ "Pos" ] = 0;
$Context[ "State" ] = 0;
return $Context[ "Data" ];
}
return "";
} // UTF7DecodeFinal
//
//
// UTF7DecodeString
//
// Converts a string encoded in modified UTF-7 encoding
// to ISO 8859-1.
// OBS: Works only for valid ISO 8859-1 characters in the
// encoded data
//
function UTF7DecodeString($String)
{
$Decoding = false;
for ($I = 0; $I < strlen($String); $I++)
{
$Ch = substr($String, $I, 1);
if ($Decoding)
{
if ($Ch == "-")
{
$RetVal .= UTF7DecodeFinal($Context);
$Decoding = false;
}
else
UTF7DecodeByte($Context, $Ch);
}
elseif ($Ch == "&")
{
if (($I < strlen($String) - 1) && (substr($String, $I + 1, 1) == "-"))
{
$RetVal .= $Ch;
$I++;
}
else
{
UTF7DecodeInit($Context);
$Decoding = true;
}
}
else
$RetVal .= $Ch;
}
return str_replace("\0", "", $RetVal);
} // UTF7DecodeString
?>

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