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tdepim/tdeioslave/imap4/rfcdecoder.cpp

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16 KiB

/**********************************************************************
*
* rfcdecoder.cpp - handler for various rfc/mime encodings
* Copyright (C) 2000 s.carstens@gmx.de
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Send comments and bug fixes to s.carstens@gmx.de
*
*********************************************************************/
#include "rfcdecoder.h"
#include <ctype.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <tqtextcodec.h>
#include <tqbuffer.h>
#include <tqregexp.h>
#include <kmdcodec.h>
// This part taken from rfc 2192 IMAP URL Scheme. C. Newman. September 1997.
// adapted to QT-Toolkit by Sven Carstens <s.carstens@gmx.de> 2000
static unsigned char base64chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
#define UNDEFINED 64
#define MAXLINE 76
/* UTF16 definitions */
#define UTF16MASK 0x03FFUL
#define UTF16SHIFT 10
#define UTF16BASE 0x10000UL
#define UTF16HIGHSTART 0xD800UL
#define UTF16HIGHEND 0xDBFFUL
#define UTF16LOSTART 0xDC00UL
#define UTF16LOEND 0xDFFFUL
/* Convert an IMAP mailbox to a Unicode path
*/
TQString rfcDecoder::fromIMAP (const TQString & inSrc)
{
unsigned char c, i, bitcount;
unsigned long ucs4, utf16, bitbuf;
unsigned char base64[256], utf8[6];
unsigned long srcPtr = 0;
TQCString dst;
TQCString src = inSrc.ascii ();
uint srcLen = inSrc.length();
/* initialize modified base64 decoding table */
memset (base64, UNDEFINED, sizeof (base64));
for (i = 0; i < sizeof (base64chars); ++i)
{
base64[(int)base64chars[i]] = i;
}
/* loop until end of string */
while (srcPtr < srcLen)
{
c = src[srcPtr++];
/* deal with literal characters and &- */
if (c != '&' || src[srcPtr] == '-')
{
/* encode literally */
dst += c;
/* skip over the '-' if this is an &- sequence */
if (c == '&')
srcPtr++;
}
else
{
/* convert modified UTF-7 -> UTF-16 -> UCS-4 -> UTF-8 -> HEX */
bitbuf = 0;
bitcount = 0;
ucs4 = 0;
while ((c = base64[(unsigned char) src[srcPtr]]) != UNDEFINED)
{
++srcPtr;
bitbuf = (bitbuf << 6) | c;
bitcount += 6;
/* enough bits for a UTF-16 character? */
if (bitcount >= 16)
{
bitcount -= 16;
utf16 = (bitcount ? bitbuf >> bitcount : bitbuf) & 0xffff;
/* convert UTF16 to UCS4 */
if (utf16 >= UTF16HIGHSTART && utf16 <= UTF16HIGHEND)
{
ucs4 = (utf16 - UTF16HIGHSTART) << UTF16SHIFT;
continue;
}
else if (utf16 >= UTF16LOSTART && utf16 <= UTF16LOEND)
{
ucs4 += utf16 - UTF16LOSTART + UTF16BASE;
}
else
{
ucs4 = utf16;
}
/* convert UTF-16 range of UCS4 to UTF-8 */
if (ucs4 <= 0x7fUL)
{
utf8[0] = ucs4;
i = 1;
}
else if (ucs4 <= 0x7ffUL)
{
utf8[0] = 0xc0 | (ucs4 >> 6);
utf8[1] = 0x80 | (ucs4 & 0x3f);
i = 2;
}
else if (ucs4 <= 0xffffUL)
{
utf8[0] = 0xe0 | (ucs4 >> 12);
utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[2] = 0x80 | (ucs4 & 0x3f);
i = 3;
}
else
{
utf8[0] = 0xf0 | (ucs4 >> 18);
utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[3] = 0x80 | (ucs4 & 0x3f);
i = 4;
}
/* copy it */
for (c = 0; c < i; ++c)
{
dst += utf8[c];
}
}
}
/* skip over trailing '-' in modified UTF-7 encoding */
if (src[srcPtr] == '-')
++srcPtr;
}
}
return TQString::fromUtf8 (dst.data ());
}
/* replace " with \" and \ with \\ " and \ characters */
TQString rfcDecoder::quoteIMAP(const TQString &src)
{
uint len = src.length();
TQString result;
result.reserve(2 * len);
for (unsigned int i = 0; i < len; i++)
{
if (src[i] == '"' || src[i] == '\\')
result += '\\';
result += src[i];
}
//result.squeeze(); - unnecessary and slow
return result;
}
/* Convert Unicode path to modified UTF-7 IMAP mailbox
*/
TQString rfcDecoder::toIMAP (const TQString & inSrc)
{
unsigned int utf8pos, utf8total, c, utf7mode, bitstogo, utf16flag;
unsigned long ucs4, bitbuf;
TQCString src = inSrc.utf8 ();
TQString dst;
ulong srcPtr = 0;
utf7mode = 0;
utf8total = 0;
bitstogo = 0;
utf8pos = 0;
bitbuf = 0;
ucs4 = 0;
while (srcPtr < src.length ())
{
c = (unsigned char) src[srcPtr++];
/* normal character? */
if (c >= ' ' && c <= '~')
{
/* switch out of UTF-7 mode */
if (utf7mode)
{
if (bitstogo)
{
dst += base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
bitstogo = 0;
}
dst += '-';
utf7mode = 0;
}
dst += c;
/* encode '&' as '&-' */
if (c == '&')
{
dst += '-';
}
continue;
}
/* switch to UTF-7 mode */
if (!utf7mode)
{
dst += '&';
utf7mode = 1;
}
/* Encode US-ASCII characters as themselves */
if (c < 0x80)
{
ucs4 = c;
utf8total = 1;
}
else if (utf8total)
{
/* save UTF8 bits into UCS4 */
ucs4 = (ucs4 << 6) | (c & 0x3FUL);
if (++utf8pos < utf8total)
{
continue;
}
}
else
{
utf8pos = 1;
if (c < 0xE0)
{
utf8total = 2;
ucs4 = c & 0x1F;
}
else if (c < 0xF0)
{
utf8total = 3;
ucs4 = c & 0x0F;
}
else
{
/* NOTE: can't convert UTF8 sequences longer than 4 */
utf8total = 4;
ucs4 = c & 0x03;
}
continue;
}
/* loop to split ucs4 into two utf16 chars if necessary */
utf8total = 0;
do
{
if (ucs4 >= UTF16BASE)
{
ucs4 -= UTF16BASE;
bitbuf = (bitbuf << 16) | ((ucs4 >> UTF16SHIFT) + UTF16HIGHSTART);
ucs4 = (ucs4 & UTF16MASK) + UTF16LOSTART;
utf16flag = 1;
}
else
{
bitbuf = (bitbuf << 16) | ucs4;
utf16flag = 0;
}
bitstogo += 16;
/* spew out base64 */
while (bitstogo >= 6)
{
bitstogo -= 6;
dst += base64chars[(bitstogo ? (bitbuf >> bitstogo) : bitbuf) & 0x3F];
}
}
while (utf16flag);
}
/* if in UTF-7 mode, finish in ASCII */
if (utf7mode)
{
if (bitstogo)
{
dst += base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
}
dst += '-';
}
return quoteIMAP(dst);
}
//-----------------------------------------------------------------------------
TQString rfcDecoder::decodeQuoting(const TQString &aStr)
{
TQString result;
unsigned int strLength(aStr.length());
for (unsigned int i = 0; i < strLength ; i++)
{
if (aStr[i] == "\\") i++;
result += aStr[i];
}
return result;
}
//-----------------------------------------------------------------------------
TQTextCodec *
rfcDecoder::codecForName (const TQString & _str)
{
if (_str.isEmpty ())
return NULL;
return TQTextCodec::codecForName (_str.lower ().
replace ("windows", "cp").latin1 ());
}
//-----------------------------------------------------------------------------
const TQString
rfcDecoder::decodeRFC2047String (const TQString & _str)
{
TQString throw_away;
return decodeRFC2047String (_str, throw_away);
}
//-----------------------------------------------------------------------------
const TQString
rfcDecoder::decodeRFC2047String (const TQString & _str, TQString & charset)
{
TQString throw_away;
return decodeRFC2047String (_str, charset, throw_away);
}
//-----------------------------------------------------------------------------
const TQString
rfcDecoder::decodeRFC2047String (const TQString & _str, TQString & charset,
TQString & language)
{
//do we have a rfc string
if (_str.find("=?") < 0)
return _str;
TQCString aStr = _str.ascii (); // TQString.length() means Unicode chars
TQCString result;
char *pos, *beg, *end, *mid = NULL;
TQCString str;
char encoding = 0, ch;
bool valid;
const int maxLen = 200;
int i;
// result.truncate(aStr.length());
for (pos = aStr.data (); *pos; pos++)
{
if (pos[0] != '=' || pos[1] != '?')
{
result += *pos;
continue;
}
beg = pos + 2;
end = beg;
valid = TRUE;
// parse charset name
for (i = 2, pos += 2;
i < maxLen && (*pos != '?' && (ispunct (*pos) || isalnum (*pos)));
i++)
pos++;
if (*pos != '?' || i < 4 || i >= maxLen)
valid = FALSE;
else
{
charset = TQCString (beg, i - 1); // -2 + 1 for the zero
int pt = charset.findRev('*');
if (pt != -1)
{
// save language for later usage
language = charset.right (charset.length () - pt - 1);
// tie off language as defined in rfc2047
charset.truncate(pt);
}
// get encoding and check delimiting question marks
encoding = toupper (pos[1]);
if (pos[2] != '?'
|| (encoding != 'Q' && encoding != 'B' && encoding != 'q'
&& encoding != 'b'))
valid = FALSE;
pos += 3;
i += 3;
// kdDebug(7116) << "rfcDecoder::decodeRFC2047String - charset " << charset << " - language " << language << " - '" << pos << "'" << endl;
}
if (valid)
{
mid = pos;
// search for end of encoded part
while (i < maxLen && *pos && !(*pos == '?' && *(pos + 1) == '='))
{
i++;
pos++;
}
end = pos + 2; //end now points to the first char after the encoded string
if (i >= maxLen || !*pos)
valid = FALSE;
}
if (valid)
{
ch = *pos;
*pos = '\0';
str = TQCString (mid).left ((int) (mid - pos - 1));
if (encoding == 'Q')
{
// decode quoted printable text
for (i = str.length () - 1; i >= 0; i--)
if (str[i] == '_')
str[i] = ' ';
// kdDebug(7116) << "rfcDecoder::decodeRFC2047String - before QP '" << str << "'" << endl;
str = KCodecs::quotedPrintableDecode(str);
// kdDebug(7116) << "rfcDecoder::decodeRFC2047String - after QP '" << str << "'" << endl;
}
else
{
// decode base64 text
str = KCodecs::base64Decode(str);
}
*pos = ch;
int len = str.length();
for (i = 0; i < len; i++)
result += (char) (TQChar) str[i];
pos = end - 1;
}
else
{
// kdDebug(7116) << "rfcDecoder::decodeRFC2047String - invalid" << endl;
//result += "=?";
//pos = beg -1; // because pos gets increased shortly afterwards
pos = beg - 2;
result += *pos++;
result += *pos;
}
}
if (!charset.isEmpty ())
{
TQTextCodec *aCodec = codecForName (charset.ascii ());
if (aCodec)
{
// kdDebug(7116) << "Codec is " << aCodec->name() << endl;
return aCodec->toUnicode (result);
}
}
return result;
}
//-----------------------------------------------------------------------------
const char especials[17] = "()<>@,;:\"/[]?.= ";
const TQString
rfcDecoder::encodeRFC2047String (const TQString & _str)
{
if (_str.isEmpty ())
return _str;
const signed char *latin = reinterpret_cast<const signed char *>(_str.latin1()), *l, *start, *stop;
char hexcode;
int numQuotes, i;
int rptr = 0;
// My stats show this number results in 12 resize() out of 73,000
int resultLen = 3 * _str.length() / 2;
TQCString result(resultLen);
while (*latin)
{
l = latin;
start = latin;
while (*l)
{
if (*l == 32)
start = l + 1;
if (*l < 0)
break;
l++;
}
if (*l)
{
numQuotes = 1;
while (*l)
{
/* The encoded word must be limited to 75 character */
for (i = 0; i < 16; i++)
if (*l == especials[i])
numQuotes++;
if (*l < 0)
numQuotes++;
/* Stop after 58 = 75 - 17 characters or at "<user@host..." */
if (l - start + 2 * numQuotes >= 58 || *l == 60)
break;
l++;
}
if (*l)
{
stop = l - 1;
while (stop >= start && *stop != 32)
stop--;
if (stop <= start)
stop = l;
}
else
stop = l;
if (resultLen - rptr - 1 <= start - latin + 1 + 16 /* =?iso-88... */) {
resultLen += (start - latin + 1) * 2 + 20; // more space
result.resize(resultLen);
}
while (latin < start)
{
result[rptr++] = *latin;
latin++;
}
strcpy(&result[rptr], "=?iso-8859-1?q?"); rptr += 15;
if (resultLen - rptr - 1 <= 3*(stop - latin + 1)) {
resultLen += (stop - latin + 1) * 4 + 20; // more space
result.resize(resultLen);
}
while (latin < stop) // can add up to 3 chars/iteration
{
numQuotes = 0;
for (i = 0; i < 16; i++)
if (*latin == especials[i])
numQuotes = 1;
if (*latin < 0)
numQuotes = 1;
if (numQuotes)
{
result[rptr++] = '=';
hexcode = ((*latin & 0xF0) >> 4) + 48;
if (hexcode >= 58)
hexcode += 7;
result[rptr++] = hexcode;
hexcode = (*latin & 0x0F) + 48;
if (hexcode >= 58)
hexcode += 7;
result[rptr++] = hexcode;
}
else
{
result[rptr++] = *latin;
}
latin++;
}
result[rptr++] = '?';
result[rptr++] = '=';
}
else
{
while (*latin)
{
if (rptr == resultLen - 1) {
resultLen += 30;
result.resize(resultLen);
}
result[rptr++] = *latin;
latin++;
}
}
}
result[rptr] = 0;
//free (latinStart);
return result;
}
//-----------------------------------------------------------------------------
const TQString
rfcDecoder::encodeRFC2231String (const TQString & _str)
{
if (_str.isEmpty ())
return _str;
signed char *latin = (signed char *) calloc (1, _str.length () + 1);
char *latin_us = (char *) latin;
strcpy (latin_us, _str.latin1 ());
signed char *l = latin;
char hexcode;
int i;
bool quote;
while (*l)
{
if (*l < 0)
break;
l++;
}
if (!*l) {
free(latin);
return _str;
}
TQCString result;
l = latin;
while (*l)
{
quote = *l < 0;
for (i = 0; i < 16; i++)
if (*l == especials[i])
quote = true;
if (quote)
{
result += "%";
hexcode = ((*l & 0xF0) >> 4) + 48;
if (hexcode >= 58)
hexcode += 7;
result += hexcode;
hexcode = (*l & 0x0F) + 48;
if (hexcode >= 58)
hexcode += 7;
result += hexcode;
}
else
{
result += *l;
}
l++;
}
free (latin);
return result;
}
//-----------------------------------------------------------------------------
const TQString
rfcDecoder::decodeRFC2231String (const TQString & _str)
{
int p = _str.find ('\'');
//see if it is an rfc string
if (p < 0)
return _str;
int l = _str.findRev ('\'');
//second is language
if (p >= l)
return _str;
//first is charset or empty
TQString charset = _str.left (p);
TQString st = _str.mid (l + 1);
TQString language = _str.mid (p + 1, l - p - 1);
//kdDebug(7116) << "Charset: " << charset << " Language: " << language << endl;
char ch, ch2;
p = 0;
while (p < (int) st.length ())
{
if (st.at (p) == 37)
{
ch = st.at (p + 1).latin1 () - 48;
if (ch > 16)
ch -= 7;
ch2 = st.at (p + 2).latin1 () - 48;
if (ch2 > 16)
ch2 -= 7;
st.at (p) = ch * 16 + ch2;
st.remove (p + 1, 2);
}
p++;
}
return st;
}