summaryrefslogtreecommitdiffstats
path: root/libkmime/kmime_content.cpp
blob: fc3af97b06477a48cd0da64ca6a145c1499ff969 (plain)
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
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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
/*
    kmime_content.cpp

    KMime, the KDE internet mail/usenet news message library.
    Copyright (c) 2001 the KMime authors.
    See file AUTHORS for details

    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.
    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, US
*/
#include "kmime_content.h"
#include "kmime_parsers.h"

#include <kcharsets.h>
#include <kmdcodec.h>
#include <kglobal.h>
#include <klocale.h>
#include <kdebug.h>

#include <tqtextcodec.h>

using namespace KMime;

namespace KMime {

Content::Content()
 : c_ontents(0), h_eaders(0), f_orceDefaultCS(false)
{
  d_efaultCS = cachedCharset("ISO-8859-1");
}


Content::Content(const TQCString &h, const TQCString &b)
 : c_ontents(0), h_eaders(0), f_orceDefaultCS(false)
{
  d_efaultCS = cachedCharset("ISO-8859-1");
  h_ead=h.copy();
  b_ody=b.copy();
}


Content::~Content()
{
  delete c_ontents;
  delete h_eaders;
}


void Content::setContent(TQStrList *l)
{
  //qDebug("Content::setContent(TQStrList *l) : start");
  h_ead.resize(0);
  b_ody.resize(0);

  //usage of textstreams is much faster than simply appending the strings
  TQTextStream hts(h_ead, IO_WriteOnly),
              bts(b_ody, IO_WriteOnly);
  hts.setEncoding(TQTextStream::Latin1);
  bts.setEncoding(TQTextStream::Latin1);

  bool isHead=true;
  for(char *line=l->first(); line; line=l->next()) {
    if(isHead && line[0]=='\0') {
      isHead=false;
      continue;
    }
    if(isHead)
      hts << line << "\n";
    else
      bts << line << "\n";
  }

  //terminate strings
  hts << '\0';
  bts << '\0';

  //qDebug("Content::setContent(TQStrList *l) : finished");
}


void Content::setContent(const TQCString &s)
{
  int pos=s.tqfind("\n\n", 0);
  if(pos>-1) {
    h_ead=s.left(++pos);  //header *must* end with "\n" !!
    b_ody=s.mid(pos+1, s.length()-pos-1);
  }
  else
    h_ead=s;
}


//parse the message, split multiple parts
void Content::parse()
{
  //qDebug("void Content::parse() : start");
  delete h_eaders;
  h_eaders=0;
  
  // check this part has already been partioned into subparts.
  // if this is the case, we will not try to reparse the body
  // of this part.
  if ((b_ody.size() == 0) && (c_ontents != 0) && !c_ontents->isEmpty()) {
    // reparse all sub parts
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      c->parse();
    return;
  }    
  
  delete c_ontents;
  c_ontents=0;

  Headers::ContentType *ct=contentType();
  TQCString tmp;
  Content *c;
  Headers::contentCategory cat;

  // just "text" as mimetype is suspicious, perhaps this article was
  // generated by broken software, better check for uuencoded binaries
  if (ct->mimeType()=="text")
    ct->setMimeType("invalid/invalid");

  if(ct->isText())
    return; //nothing to do

  if(ct->isMultipart()) {   //this is a multipart message
    tmp=ct->boundary(); //get boundary-parameter

    if(!tmp.isEmpty()) {
      Parser::MultiPart mpp(b_ody, tmp);
      if(mpp.parse()) { //at least one part found

        c_ontents=new List();
        c_ontents->setAutoDelete(true);

        if(ct->isSubtype("alternative")) //examine category for the sub-parts
          cat=Headers::CCalternativePart;
        else
          cat=Headers::CCmixedPart;  //default to "mixed"

        QCStringList parts=mpp.parts();
        QCStringList::Iterator it;
        for(it=parts.begin(); it!=parts.end(); ++it) { //create a new Content for every part
          c=new Content();
          c->setContent(*it);
          c->parse();
          c->contentType()->setCategory(cat); //set category of the sub-part
          c_ontents->append(c);
          //qDebug("part:\n%s\n\n%s", c->h_ead.data(), c->b_ody.left(100).data());
        }

        //the whole content is now split into single parts, so it's safe delete the message-body
        b_ody.resize(0);
      }
      else { //sh*t, the parsing failed so we have to treat the message as "text/plain" instead
        ct->setMimeType("text/plain");
        ct->setCharset("US-ASCII");
      }
    }
  }
  else if (ct->mimeType()=="invalid/invalid") { //non-mime body => check for uuencoded content
    Parser::UUEncoded uup(b_ody, rawHeader("Subject"));

    if(uup.parse()) { // yep, it is uuencoded

      if(uup.isPartial()) {  // this seems to be only a part of the message so we treat it as "message/partial"
        ct->setMimeType("message/partial");
        //ct->setId(uniqueString()); not needed yet
        ct->setPartialParams(uup.partialCount(), uup.partialNumber());
        contentTransferEncoding()->setCte(Headers::CE7Bit);
      }
      else { //it's a complete message => treat as "multipart/mixed"
        //the whole content is now split into single parts, so it's safe to delete the message-body
        b_ody.resize(0);

        //binary parts
        for (unsigned int i=0;i<uup.binaryParts().count();i++) {
          c=new Content();
          //generate content with mime-compliant headers
          tmp="Content-Type: ";
          tmp += uup.mimeTypes().at(i);
          tmp += "; name=\"";
          tmp += uup.filenames().at(i);
          tmp += "\"\nContent-Transfer-Encoding: x-uuencode\nContent-Disposition: attachment; filename=\"";
          tmp += uup.filenames().at(i);
          tmp += "\"\n\n";
          tmp += uup.binaryParts().at(i);
          c->setContent(tmp);
          addContent(c);
        }

        if(c_ontents && c_ontents->first()) { //readd the plain text before the uuencoded part
          c_ontents->first()->setContent("Content-Type: text/plain\nContent-Transfer-Encoding: 7Bit\n\n"+uup.textPart());
          c_ontents->first()->contentType()->setMimeType("text/plain");
        }
      }
    } else {
      Parser::YENCEncoded yenc(b_ody);
 
      if ( yenc.parse()) {
        /* If it is partial, just assume there is exactly one decoded part,
         * and make this that part */
        if (yenc.isPartial()) {
          ct->setMimeType("message/partial");
          //ct->setId(uniqueString()); not needed yet
          ct->setPartialParams(yenc.partialCount(), yenc.partialNumber());
          contentTransferEncoding()->setCte(Headers::CEbinary);
        }
        else { //it's a complete message => treat as "multipart/mixed"
          //the whole content is now split into single parts, so it's safe to delete the message-body
          b_ody.resize(0);

          //binary parts
          for (unsigned int i=0;i<yenc.binaryParts().count();i++) {
            c=new Content();
            //generate content with mime-compliant headers
            tmp="Content-Type: ";
            tmp += yenc.mimeTypes().at(i);
            tmp += "; name=\"";
            tmp += yenc.filenames().at(i);
            tmp += "\"\nContent-Transfer-Encoding: binary\nContent-Disposition: attachment; filename=\"";
            tmp += yenc.filenames().at(i);
            tmp += "\"\n\n";
            c->setContent(tmp);
            
            // the bodies of yenc message parts are binary data, not null-terminated strings:            
            TQByteArray body = yenc.binaryParts()[i];
            TQCString body_string(body.size());
            memcpy(body_string.data(), body.data(), body.size());
            c->setBody(body_string);            
    
            addContent(c);
          }

          if(c_ontents && c_ontents->first()) { //readd the plain text before the uuencoded part
            c_ontents->first()->setContent("Content-Type: text/plain\nContent-Transfer-Encoding: 7Bit\n\n"+yenc.textPart());
            c_ontents->first()->contentType()->setMimeType("text/plain");
          }
        }
      }    
      else { //no, this doesn't look like uuencoded stuff => we treat it as "text/plain"        
        ct->setMimeType("text/plain");
      }
    }
  }

  //qDebug("void Content::parse() : finished");
}


void Content::assemble()
{
  TQCString newHead="";

  //Content-Type
  newHead+=contentType()->as7BitString()+"\n";

  //Content-Transfer-Encoding
  newHead+=contentTransferEncoding()->as7BitString()+"\n";

  //Content-Description
  Headers::Base *h=contentDescription(false);
  if(h)
    newHead+=h->as7BitString()+"\n";

  //Content-Disposition
  h=contentDisposition(false);
  if(h)
    newHead+=h->as7BitString()+"\n";

  h_ead=newHead;
}


void Content::clear()
{
  delete h_eaders;
  h_eaders=0;
  delete c_ontents;
  c_ontents=0;
  h_ead.resize(0);
  b_ody.resize(0);
}


TQCString Content::encodedContent(bool useCrLf)
{
  TQCString e;

  // hack to convert articles with uuencoded or yencoded binaries into
  // proper mime-compliant articles
  if(c_ontents && !c_ontents->isEmpty()) {
    bool convertNonMimeBinaries=false;

    // reencode non-mime binaries...
    for(Content *c=c_ontents->first(); c; c=c_ontents->next()) {
      if ((c->contentTransferEncoding(true)->cte()==Headers::CEuuenc) ||
          (c->contentTransferEncoding(true)->cte()==Headers::CEbinary)) {
        convertNonMimeBinaries=true;
        c->b_ody = KCodecs::base64Encode(c->decodedContent(), true);
        c->b_ody.append("\n");
        c->contentTransferEncoding(true)->setCte(Headers::CEbase64);
        c->contentTransferEncoding(true)->setDecoded(false);
        c->removeHeader("Content-Description");
        c->assemble();
      }
    }

    // add proper mime headers...
    if (convertNonMimeBinaries) {
      h_ead.tqreplace(TQRegExp("MIME-Version: .*\\n"),"");
      h_ead.tqreplace(TQRegExp("Content-Type: .*\\n"),"");
      h_ead.tqreplace(TQRegExp("Content-Transfer-Encoding: .*\\n"),"");
      h_ead+="MIME-Version: 1.0\n";
      h_ead+=contentType(true)->as7BitString()+"\n";
      h_ead+=contentTransferEncoding(true)->as7BitString()+"\n";
    }
  }

  //head
  e=h_ead.copy();
  e+="\n";

  //body
  if(!b_ody.isEmpty()) { //this message contains only one part
    Headers::CTEncoding *enc=contentTransferEncoding();

    if(enc->needToEncode()) {
      if(enc->cte()==Headers::CEquPr) {
        TQByteArray temp(b_ody.length());
        memcpy(temp.data(), b_ody.data(), b_ody.length());
        e+=KCodecs::quotedPrintableEncode(temp, false);
      } else {
        e+=KCodecs::base64Encode(b_ody, true);
        e+="\n";
      }
    }
    else
      e+=b_ody;
  }
  else if(c_ontents && !c_ontents->isEmpty()) { //this is a multipart message
    Headers::ContentType *ct=contentType();
    TQCString boundary="\n--"+ct->boundary();

    //add all (encoded) contents separated by boundaries
    for(Content *c=c_ontents->first(); c; c=c_ontents->next()) {
      e+=boundary+"\n";
      e+=c->encodedContent(false);  // don't convert LFs here, we do that later!!!!!
    }
    //finally append the closing boundary
    e+=boundary+"--\n";
  };

  if(useCrLf)
    return LFtoCRLF(e);
  else
    return e;
}


TQByteArray Content::decodedContent()
{
  TQByteArray temp, ret;
  Headers::CTEncoding *ec=contentTransferEncoding();
  bool removeTrailingNewline=false;
  int size=ec->cte()==Headers::CEbinary ? b_ody.size() : b_ody.length();
  
  if (size==0)
    return ret;

  temp.resize(size);
  memcpy(temp.data(), b_ody.data(), size);

  if(ec->decoded()) {
    ret = temp;
    removeTrailingNewline=true;
  } else {
    switch(ec->cte()) {
      case Headers::CEbase64 :
        KCodecs::base64Decode(temp, ret);
      break;
      case Headers::CEquPr :
        ret = KCodecs::quotedPrintableDecode(b_ody);
        ret.resize(ret.size()-1);  // remove null-char
        removeTrailingNewline=true;
      break;
      case Headers::CEuuenc :
        KCodecs::uudecode(temp, ret);
      break;
      case Headers::CEbinary :
        ret = temp;
        removeTrailingNewline=false;
      break;
      default :
        ret = temp;
        removeTrailingNewline=true;
    }
  }

  if (removeTrailingNewline && (ret.size()>0) && (ret[ret.size()-1] == '\n'))
    ret.resize(ret.size()-1);

  return ret;
}


void Content::decodedText(TQString &s, bool trimText,
			  bool removeTrailingNewlines)
{
  if(!decodeText()) //this is not a text content !!
    return;

  bool ok=true;
  TQTextCodec *codec=KGlobal::charsets()->codecForName(contentType()->charset(),ok);

  s=codec->toUnicode(b_ody.data(), b_ody.length());

  if (trimText && removeTrailingNewlines) {
    int i;
    for (i=s.length()-1; i>=0; i--)
      if (!s[i].isSpace())
        break;
    s.truncate(i+1);
  } else {
    if (s.right(1)=="\n")
      s.truncate(s.length()-1);    // remove trailing new-line
  }
}


void Content::decodedText(TQStringList &l, bool trimText,
			  bool removeTrailingNewlines)
{
  if(!decodeText()) //this is not a text content !!
    return;

  TQString tqunicode;
  bool ok=true;

  TQTextCodec *codec=KGlobal::charsets()->codecForName(contentType()->charset(),ok);

  tqunicode=codec->toUnicode(b_ody.data(), b_ody.length());

  if (trimText && removeTrailingNewlines) {
    int i;
    for (i=tqunicode.length()-1; i>=0; i--)
      if (!tqunicode[i].isSpace())
        break;
    tqunicode.truncate(i+1);
  } else {
    if (tqunicode.right(1)=="\n")
      tqunicode.truncate(tqunicode.length()-1);    // remove trailing new-line
  }

  l=TQStringList::split('\n', tqunicode, true); //split the string at linebreaks
}


void Content::fromUnicodeString(const TQString &s)
{
  bool ok=true;
  TQTextCodec *codec=KGlobal::charsets()->codecForName(contentType()->charset(),ok);

  if(!ok) { // no suitable codec found => try local settings and hope the best ;-)
    codec=KGlobal::locale()->codecForEncoding();
    TQCString chset=KGlobal::locale()->encoding();
    contentType()->setCharset(chset);
  }

  b_ody=codec->fromUnicode(s);
  contentTransferEncoding()->setDecoded(true); //text is always decoded
}


Content* Content::textContent()
{
  Content *ret=0;

  //return the first content with mimetype=text/*
  if(contentType()->isText())
    ret=this;
  else if(c_ontents)
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      if( (ret=c->textContent())!=0 )
        break;

  return ret;
}


void Content::attachments(Content::List *dst, bool incAlternatives)
{
  dst->setAutoDelete(false); //don't delete the contents

  if(!c_ontents)
    dst->append(this);
  else {
    for(Content *c=c_ontents->first(); c; c=c_ontents->next()) {
      if( !incAlternatives && c->contentType()->category()==Headers::CCalternativePart)
        continue;
      else
        c->attachments(dst, incAlternatives);
    }
  }

  if(type()!=ATmimeContent) { // this is the toplevel article
    Content *text=textContent();
    if(text)
      dst->removeRef(text);
  }
}


void Content::addContent(Content *c, bool prepend)
{
  if(!c_ontents) { // this message is not multipart yet
    c_ontents=new List();
    c_ontents->setAutoDelete(true);

    // first we convert the body to a content
    Content *main=new Content();

    //the Mime-Headers are needed, so we move them to the new content
    if(h_eaders) {

      main->h_eaders=new Headers::Base::List();
      main->h_eaders->setAutoDelete(true);

      Headers::Base::List srcHdrs=(*h_eaders);
      srcHdrs.setAutoDelete(false);
      int idx=0;
      for(Headers::Base *h=srcHdrs.first(); h; h=srcHdrs.next()) {
        if(h->isMimeHeader()) {
          //remove from this content
          idx=h_eaders->tqfindRef(h);
          h_eaders->take(idx);
          //append to new content
          main->h_eaders->append(h);
        }
      }
    }

    //"main" is now part of a multipart/mixed message
    main->contentType()->setCategory(Headers::CCmixedPart);

    //the head of "main" is empty, so we assemble it
    main->assemble();

    //now we can copy the body and append the new content;
    main->b_ody=b_ody.copy();
    c_ontents->append(main);
    b_ody.resize(0); //not longer needed


    //finally we have to convert this article to "multipart/mixed"
    Headers::ContentType *ct=contentType();
    ct->setMimeType("multipart/mixed");
    ct->setBoundary(multiPartBoundary());
    ct->setCategory(Headers::CCcontainer);
    contentTransferEncoding()->clear();  // 7Bit, decoded

  }
  //here we actually add the content
  if(prepend)
    c_ontents->insert(0, c);
  else
    c_ontents->append(c);
}


void Content::removeContent(Content *c, bool del)
{
  if(!c_ontents) // what the ..
    return;

  int idx=0;
  if(del)
    c_ontents->removeRef(c);
  else {
    idx=c_ontents->tqfindRef(c);
    c_ontents->take(idx);
  }

  //only one content left => turn this message in a single-part
  if(c_ontents->count()==1) {
    Content *main=c_ontents->first();

    //first we have to move the mime-headers
    if(main->h_eaders) {
      if(!h_eaders) {
        h_eaders=new Headers::Base::List();
        h_eaders->setAutoDelete(true);
      }

      Headers::Base::List mainHdrs=(*(main->h_eaders));
      mainHdrs.setAutoDelete(false);

      for(Headers::Base *h=mainHdrs.first(); h; h=mainHdrs.next()) {
        if(h->isMimeHeader()) {
          removeHeader(h->type()); //remove the old header first
          h_eaders->append(h); //now append the new one
          idx=main->h_eaders->tqfindRef(h);
          main->h_eaders->take(idx); //remove from the old content
          kdDebug(5003) << "Content::removeContent(Content *c, bool del) : mime-header moved: "
                        << h->as7BitString() << endl;
        }
      }
    }

    //now we can copy the body
    b_ody=main->b_ody.copy();

    //finally we can delete the content list
    delete c_ontents;
    c_ontents=0;
  }
}


void Content::changeEncoding(Headers::contentEncoding e)
{
  Headers::CTEncoding *enc=contentTransferEncoding();
  if(enc->cte()==e) //nothing to do
    return;

  if(decodeText())
    enc->setCte(e); // text is not encoded until it's sent or saved so we just set the new encoding
  else { // this content contains non textual data, that has to be re-encoded

    if(e!=Headers::CEbase64) {
      //kdWarning(5003) << "Content::changeEncoding() : non textual data and encoding != base64 - this should not happen\n => forcing base64" << endl;
      e=Headers::CEbase64;
    }

    if(enc->cte()!=e) { // ok, we reencode the content using base64
      b_ody = KCodecs::base64Encode(decodedContent(), true);
      b_ody.append("\n");
      enc->setCte(e); //set encoding
      enc->setDecoded(false);
    }
  }
}


void Content::toStream(TQTextStream &ts, bool scrambleFromLines)
{
  TQCString ret=encodedContent(false);

  if (scrambleFromLines)
    ret.tqreplace(TQRegExp("\\n\\nFrom "), "\n\n>From ");

  ts << ret;
}


Headers::Generic*  Content::getNextHeader(TQCString &head)
{
  int pos1=-1, pos2=0, len=head.length()-1;
  bool folded(false);
  Headers::Generic *header=0;

  pos1 = head.tqfind(": ");

  if (pos1>-1) {    //there is another header
    pos2=pos1+=2; //skip the name

    if (head[pos2]!='\n') {  // check if the header is not empty
      while(1) {
        pos2=head.tqfind("\n", pos2+1);
        if(pos2==-1 || pos2==len || ( head[pos2+1]!=' ' && head[pos2+1]!='\t') ) //break if we reach the end of the string, honor folded lines
          break;
        else
          folded = true;
      }
    }

    if(pos2<0) pos2=len+1; //take the rest of the string

    if (!folded)
      header = new Headers::Generic(head.left(pos1-2), this, head.mid(pos1, pos2-pos1));
    else
      header = new Headers::Generic(head.left(pos1-2), this, head.mid(pos1, pos2-pos1).tqreplace(TQRegExp("\\s*\\n\\s*")," "));

    head.remove(0,pos2+1);
  }
  else {
    head = "";
  }

  return header;
}


Headers::Base* Content::getHeaderByType(const char *type)
{
  if(!type)
    return 0;

  Headers::Base *h=0;
  //first we check if the requested header is already cached
  if(h_eaders)
    for(h=h_eaders->first(); h; h=h_eaders->next())
      if(h->is(type)) return h; //found

  //now we look for it in the article head
  TQCString raw=rawHeader(type);
  if(!raw.isEmpty()) { //ok, we found it
    //choose a suitable header class
    if(strcasecmp("Message-Id", type)==0)
      h=new Headers::MessageID(this, raw);
    else if(strcasecmp("Subject", type)==0)
      h=new Headers::Subject(this, raw);
    else if(strcasecmp("Date", type)==0)
      h=new Headers::Date(this, raw);
    else if(strcasecmp("From", type)==0)
      h=new Headers::From(this, raw);
    else if(strcasecmp("Organization", type)==0)
      h=new Headers::Organization(this, raw);
    else if(strcasecmp("Reply-To", type)==0)
      h=new Headers::ReplyTo(this, raw);
    else if(strcasecmp("Mail-Copies-To", type)==0)
      h=new Headers::MailCopiesTo(this, raw);
    else if(strcasecmp("To", type)==0)
      h=new Headers::To(this, raw);
    else if(strcasecmp("CC", type)==0)
      h=new Headers::CC(this, raw);
    else if(strcasecmp("BCC", type)==0)
      h=new Headers::BCC(this, raw);
    else if(strcasecmp("Newsgroups", type)==0)
      h=new Headers::Newsgroups(this, raw);
    else if(strcasecmp("Followup-To", type)==0)
      h=new Headers::FollowUpTo(this, raw);
    else if(strcasecmp("References", type)==0)
      h=new Headers::References(this, raw);
    else if(strcasecmp("Lines", type)==0)
      h=new Headers::Lines(this, raw);
    else if(strcasecmp("Content-Type", type)==0)
      h=new Headers::ContentType(this, raw);
    else if(strcasecmp("Content-Transfer-Encoding", type)==0)
      h=new Headers::CTEncoding(this, raw);
    else if(strcasecmp("Content-Disposition", type)==0)
      h=new Headers::CDisposition(this, raw);
    else if(strcasecmp("Content-Description", type)==0)
      h=new Headers::CDescription(this, raw);
    else
      h=new Headers::Generic(type, this, raw);

    if(!h_eaders) {
      h_eaders=new Headers::Base::List();
      h_eaders->setAutoDelete(true);
    }

    h_eaders->append(h);  //add to cache
    return h;
  }
  else
    return 0; //header not found
}


void Content::setHeader(Headers::Base *h)
{
  if(!h) return;
  removeHeader(h->type());
  if(!h_eaders) {
    h_eaders=new Headers::Base::List();
    h_eaders->setAutoDelete(true);
  }
  h_eaders->append(h);
}


bool Content::removeHeader(const char *type)
{
  if(h_eaders)
    for(Headers::Base *h=h_eaders->first(); h; h=h_eaders->next())
      if(h->is(type))
        return h_eaders->remove();

  return false;
}


int Content::size()
{
  int ret=b_ody.length();

  if(contentTransferEncoding()->cte()==Headers::CEbase64)
    return (ret*3/4); //base64 => 6 bit per byte

  return ret;
}


int Content::storageSize()
{
  int s=h_ead.size();

  if(!c_ontents)
    s+=b_ody.size();
  else {
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      s+=c->storageSize();
  }

  return s;
}


int Content::lineCount()
{
  int ret=0;
  if(type()==ATmimeContent)
    ret+=h_ead.tqcontains('\n');
  ret+=b_ody.tqcontains('\n');

  if(c_ontents && !c_ontents->isEmpty())
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      ret+=c->lineCount();

  return ret;
}


TQCString Content::rawHeader(const char *name)
{
  return extractHeader(h_ead, name);
}


bool Content::decodeText()
{
  Headers::CTEncoding *enc=contentTransferEncoding();

  if(!contentType()->isText())
    return false; //non textual data cannot be decoded here => use decodedContent() instead
  if(enc->decoded())
    return true; //nothing to do

  switch(enc->cte()) {
    case Headers::CEbase64 :
      b_ody=KCodecs::base64Decode(b_ody);
      b_ody.append("\n");
    break;
    case Headers::CEquPr :
      b_ody=KCodecs::quotedPrintableDecode(b_ody);
    break;
    case Headers::CEuuenc :
      b_ody=KCodecs::uudecode(b_ody);
      b_ody.append("\n");
    break;
    case Headers::CEbinary :
      b_ody=TQCString(b_ody.data(), b_ody.size()+1);
      b_ody.append("\n");
    default :
    break;
  }

  enc->setDecoded(true);
  return true;
}


void Content::setDefaultCharset(const TQCString &cs)
{ 
  d_efaultCS = KMime::cachedCharset(cs); 
  
  if(c_ontents && !c_ontents->isEmpty())
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      c->setDefaultCharset(cs);
      
  // reparse the part and its sub-parts in order
  // to clear cached header values
  parse();      
}


void Content::setForceDefaultCS(bool b)
{
  f_orceDefaultCS=b;
  
  if(c_ontents && !c_ontents->isEmpty())
    for(Content *c=c_ontents->first(); c; c=c_ontents->next())
      c->setForceDefaultCS(b);
  
  // reparse the part and its sub-parts in order
  // to clear cached header values    
  parse();
}


} // namespace KMime