libcitadel/lib/stringbuf.c

   1 #include <ctype.h>
   2 #include <errno.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <stdio.h>
   7 #include <sys/select.h>
   8 #include <fcntl.h>
   9 #define SHOW_ME_VAPPEND_PRINTF
  10 #include <stdarg.h>
  11 #include "libcitadel.h"
  12
  13
  14 struct StrBuf {
  15         char *buf;
  16         long BufSize;
  17         long BufUsed;
  18         int ConstBuf;
  19 };
  20
  21
  22 inline const char *ChrPtr(const StrBuf *Str)
  23 {
  24         if (Str == NULL)
  25                 return "";
  26         return Str->buf;
  27 }
  28
  29 inline int StrLength(const StrBuf *Str)
  30 {
  31         return (Str != NULL) ? Str->BufUsed : 0;
  32 }
  33
  34 StrBuf* NewStrBuf(void)
  35 {
  36         StrBuf *NewBuf;
  37
  38         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  39         NewBuf->buf = (char*) malloc(SIZ);
  40         NewBuf->buf[0] = '\0';
  41         NewBuf->BufSize = SIZ;
  42         NewBuf->BufUsed = 0;
  43         NewBuf->ConstBuf = 0;
  44         return NewBuf;
  45 }
  46
  47 StrBuf* NewStrBufDup(const StrBuf *CopyMe)
  48 {
  49         StrBuf *NewBuf;
  50
  51         if (CopyMe == NULL)
  52                 return NewStrBuf();
  53
  54         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  55         NewBuf->buf = (char*) malloc(CopyMe->BufSize);
  56         memcpy(NewBuf->buf, CopyMe->buf, CopyMe->BufUsed + 1);
  57         NewBuf->BufUsed = CopyMe->BufUsed;
  58         NewBuf->BufSize = CopyMe->BufSize;
  59         NewBuf->ConstBuf = 0;
  60         return NewBuf;
  61 }
  62
  63 StrBuf* NewStrBufPlain(const char* ptr, int nChars)
  64 {
  65         StrBuf *NewBuf;
  66         size_t Siz = SIZ;
  67         size_t CopySize;
  68
  69         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  70         if (nChars < 0)
  71                 CopySize = strlen((ptr != NULL)?ptr:"");
  72         else
  73                 CopySize = nChars;
  74
  75         while (Siz <= CopySize)
  76                 Siz *= 2;
  77
  78         NewBuf->buf = (char*) malloc(Siz);
  79         NewBuf->BufSize = Siz;
  80         if (ptr != NULL) {
  81                 memcpy(NewBuf->buf, ptr, CopySize);
  82                 NewBuf->buf[CopySize] = '\0';
  83                 NewBuf->BufUsed = CopySize;
  84         }
  85         else {
  86                 NewBuf->buf[0] = '\0';
  87                 NewBuf->BufUsed = 0;
  88         }
  89         NewBuf->ConstBuf = 0;
  90         return NewBuf;
  91 }
  92
  93
  94 StrBuf* _NewConstStrBuf(const char* StringConstant, size_t SizeOfStrConstant)
  95 {
  96         StrBuf *NewBuf;
  97
  98         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  99         NewBuf->buf = (char*) StringConstant;
 100         NewBuf->BufSize = SizeOfStrConstant;
 101         NewBuf->BufUsed = SizeOfStrConstant;
 102         NewBuf->ConstBuf = 1;
 103         return NewBuf;
 104 }
 105
 106
 107 static int IncreaseBuf(StrBuf *Buf, int KeepOriginal, int DestSize)
 108 {
 109         char *NewBuf;
 110         size_t NewSize = Buf->BufSize * 2;
 111
 112         if (Buf->ConstBuf)
 113                 return -1;
 114
 115         if (DestSize > 0)
 116                 while (NewSize < DestSize)
 117                         NewSize *= 2;
 118
 119         NewBuf= (char*) malloc(NewSize);
 120         if (KeepOriginal)
 121         {
 122                 memcpy(NewBuf, Buf->buf, Buf->BufUsed);
 123         }
 124         else
 125         {
 126                 NewBuf[0] = '\0';
 127                 Buf->BufUsed = 0;
 128         }
 129         free (Buf->buf);
 130         Buf->buf = NewBuf;
 131         Buf->BufSize *= 2;
 132         return Buf->BufSize;
 133 }
 134
 135 int FlushStrBuf(StrBuf *buf)
 136 {
 137         if (buf->ConstBuf)
 138                 return -1;
 139         buf->buf[0] ='\0';
 140         buf->BufUsed = 0;
 141         return 0;
 142 }
 143
 144 void FreeStrBuf (StrBuf **FreeMe)
 145 {
 146         if (*FreeMe == NULL)
 147                 return;
 148         if (!(*FreeMe)->ConstBuf)
 149                 free((*FreeMe)->buf);
 150         free(*FreeMe);
 151         *FreeMe = NULL;
 152 }
 153
 154 void HFreeStrBuf (void *VFreeMe)
 155 {
 156         StrBuf *FreeMe = (StrBuf*)VFreeMe;
 157         if (FreeMe == NULL)
 158                 return;
 159         if (!FreeMe->ConstBuf)
 160                 free(FreeMe->buf);
 161         free(FreeMe);
 162 }
 163
 164 long StrTol(const StrBuf *Buf)
 165 {
 166         if(Buf->BufUsed > 0)
 167                 return atol(Buf->buf);
 168         else
 169                 return 0;
 170 }
 171
 172 int StrToi(const StrBuf *Buf)
 173 {
 174         if(Buf->BufUsed > 0)
 175                 return atoi(Buf->buf);
 176         else
 177                 return 0;
 178 }
 179
 180 long StrBufPeek(StrBuf *Buf, const char* ptr, long nThChar, char PeekValue)
 181 {
 182         if (Buf == NULL)
 183                 return -1;
 184         if (ptr != NULL)
 185                 nThChar = ptr - Buf->buf;
 186         if ((nThChar < 0) || (nThChar > Buf->BufUsed))
 187                 return -1;
 188         Buf->buf[nThChar] = PeekValue;
 189         return nThChar;
 190 }
 191
 192
 193 int StrBufPlain(StrBuf *Buf, const char* ptr, int nChars)
 194 {
 195         size_t Siz = Buf->BufSize;
 196         size_t CopySize;
 197
 198         if (nChars < 0)
 199                 CopySize = strlen(ptr);
 200         else
 201                 CopySize = nChars;
 202
 203         while (Siz <= CopySize)
 204                 Siz *= 2;
 205
 206         if (Siz != Buf->BufSize)
 207                 IncreaseBuf(Buf, 0, Siz);
 208         memcpy(Buf->buf, ptr, CopySize);
 209         Buf->buf[CopySize] = '\0';
 210         Buf->BufUsed = CopySize;
 211         Buf->ConstBuf = 0;
 212         return CopySize;
 213 }
 214
 215 void StrBufAppendBuf(StrBuf *Buf, const StrBuf *AppendBuf, size_t Offset)
 216 {
 217         if ((AppendBuf == NULL) || (Buf == NULL))
 218                 return;
 219
 220         if (Buf->BufSize - Offset < AppendBuf->BufUsed + Buf->BufUsed)
 221                 IncreaseBuf(Buf,
 222                             (Buf->BufUsed > 0),
 223                             AppendBuf->BufUsed + Buf->BufUsed);
 224
 225         memcpy(Buf->buf + Buf->BufUsed,
 226                AppendBuf->buf + Offset,
 227                AppendBuf->BufUsed - Offset);
 228         Buf->BufUsed += AppendBuf->BufUsed - Offset;
 229         Buf->buf[Buf->BufUsed] = '\0';
 230 }
 231
 232
 233 void StrBufAppendBufPlain(StrBuf *Buf, const char *AppendBuf, long AppendSize, size_t Offset)
 234 {
 235         long aps;
 236
 237         if ((AppendBuf == NULL) || (Buf == NULL))
 238                 return;
 239
 240         if (AppendSize < 0 )
 241                 aps = strlen(AppendBuf + Offset);
 242         else
 243                 aps = AppendSize - Offset;
 244
 245         if (Buf->BufSize < Buf->BufUsed + aps)
 246                 IncreaseBuf(Buf, (Buf->BufUsed > 0), Buf->BufUsed + aps);
 247
 248         memcpy(Buf->buf + Buf->BufUsed,
 249                AppendBuf + Offset,
 250                aps);
 251         Buf->BufUsed += aps;
 252         Buf->buf[Buf->BufUsed] = '\0';
 253 }
 254
 255
 256 /**
 257  * \brief Escape a string for feeding out as a URL.
 258  * \param outbuf the output buffer
 259  * \param oblen the size of outbuf to sanitize
 260  * \param strbuf the input buffer
 261  */
 262 void StrBufUrlescAppend(StrBuf *OutBuf, const StrBuf *In, const char *PlainIn)
 263 {
 264         const char *pch, *pche;
 265         char *pt, *pte;
 266         int b, c, len;
 267         const char ec[] = " +#&;`'|*?-~<>^()[]{}/$\"\\";
 268         int eclen = sizeof(ec) -1;
 269
 270         if (((In == NULL) && (PlainIn == NULL)) || (OutBuf == NULL) )
 271                 return;
 272         if (PlainIn != NULL) {
 273                 len = strlen(PlainIn);
 274                 pch = PlainIn;
 275                 pche = pch + len;
 276         }
 277         else {
 278                 pch = In->buf;
 279                 pche = pch + In->BufUsed;
 280                 len = In->BufUsed;
 281         }
 282
 283         pt = OutBuf->buf + OutBuf->BufUsed;
 284         pte = OutBuf->buf + OutBuf->BufSize - 4; /**< we max append 3 chars at once plus the \0 */
 285
 286         while (pch < pche) {
 287                 if (pt >= pte) {
 288                         IncreaseBuf(OutBuf, 1, -1);
 289                         pte = OutBuf->buf + OutBuf->BufSize - 4; /**< we max append 3 chars at once plus the \0 */
 290                 }
 291
 292                 c = 0;
 293                 for (b = 0; b < eclen; ++b) {
 294                         if (*pch == ec[b]) {
 295                                 c = 1;
 296                                 b += eclen;
 297                         }
 298                 }
 299                 if (c == 1) {
 300                         snprintf(pt, pt - pte, "%%%02x", *pch);
 301                         pt += 3;
 302                         OutBuf->BufUsed += 3;
 303                 }
 304                 else {
 305                         *(pt++) = *(pch++);
 306                         OutBuf->BufUsed++;
 307                 }
 308         }
 309         *pt = '\0';
 310 }
 311
 312 /*
 313  * Copy a string, escaping characters which have meaning in HTML.
 314  *
 315  * target               target buffer
 316  * strbuf               source buffer
 317  * nbsp                 If nonzero, spaces are converted to non-breaking spaces.
 318  * nolinebreaks         if set, linebreaks are removed from the string.
 319  */
 320 long StrEscAppend(StrBuf *Target, const StrBuf *Source, const char *PlainIn, int nbsp, int nolinebreaks)
 321 {
 322         const char *aptr, *eiptr;
 323         char *bptr, *eptr;
 324         long len;
 325
 326         if (((Source == NULL) && (PlainIn == NULL)) || (Target == NULL) )
 327                 return -1;
 328
 329         if (PlainIn != NULL) {
 330                 aptr = PlainIn;
 331                 len = strlen(PlainIn);
 332                 eiptr = aptr + len;
 333         }
 334         else {
 335                 aptr = Source->buf;
 336                 eiptr = aptr + Source->BufUsed;
 337                 len = Source->BufUsed;
 338         }
 339
 340         bptr = Target->buf + Target->BufUsed;
 341         eptr = Target->buf + Target->BufSize - 6; /* our biggest unit to put in...  */
 342
 343         while (aptr < eiptr){
 344                 if(bptr >= eptr) {
 345                         IncreaseBuf(Target, 1, -1);
 346                         eptr = Target->buf + Target->BufSize - 6;
 347                 }
 348                 if (*aptr == '<') {
 349                         memcpy(bptr, "&lt;", 4);
 350                         bptr += 4;
 351                         Target->BufUsed += 4;
 352                 }
 353                 else if (*aptr == '>') {
 354                         memcpy(bptr, "&gt;", 4);
 355                         bptr += 4;
 356                         Target->BufUsed += 4;
 357                 }
 358                 else if (*aptr == '&') {
 359                         memcpy(bptr, "&amp;", 5);
 360                         bptr += 5;
 361                         Target->BufUsed += 5;
 362                 }
 363                 else if (*aptr == '\"') {
 364                         memcpy(bptr, "&quot;", 6);
 365                         bptr += 6;
 366                         Target->BufUsed += 6;
 367                 }
 368                 else if (*aptr == '\'') {
 369                         memcpy(bptr, "&#39;", 5);
 370                         bptr += 5;
 371                         Target->BufUsed += 5;
 372                 }
 373                 else if (*aptr == LB) {
 374                         *bptr = '<';
 375                         bptr ++;
 376                         Target->BufUsed ++;
 377                 }
 378                 else if (*aptr == RB) {
 379                         *bptr = '>';
 380                         bptr ++;
 381                         Target->BufUsed ++;
 382                 }
 383                 else if (*aptr == QU) {
 384                         *bptr ='"';
 385                         bptr ++;
 386                         Target->BufUsed ++;
 387                 }
 388                 else if ((*aptr == 32) && (nbsp == 1)) {
 389                         memcpy(bptr, "&nbsp;", 6);
 390                         bptr += 6;
 391                         Target->BufUsed += 6;
 392                 }
 393                 else if ((*aptr == '\n') && (nolinebreaks)) {
 394                         *bptr='\0';     /* nothing */
 395                 }
 396                 else if ((*aptr == '\r') && (nolinebreaks)) {
 397                         *bptr='\0';     /* nothing */
 398                 }
 399                 else{
 400                         *bptr = *aptr;
 401                         bptr++;
 402                         Target->BufUsed ++;
 403                 }
 404                 aptr ++;
 405         }
 406         *bptr = '\0';
 407         if ((bptr = eptr - 1 ) && !IsEmptyStr(aptr) )
 408                 return -1;
 409         return Target->BufUsed;
 410 }
 411
 412 inline int StrBufNum_tokens(const StrBuf *source, char tok)
 413 {
 414         return num_tokens(source->buf, tok);
 415 }
 416
 417
 418 int StrBufSub(StrBuf *dest, const StrBuf *Source, size_t Offset, size_t nChars)
 419 {
 420         size_t NCharsRemain;
 421         if (Offset > Source->BufUsed)
 422         {
 423                 FlushStrBuf(dest);
 424                 return 0;
 425         }
 426         if (Offset + nChars < Source->BufUsed)
 427         {
 428                 if (nChars > dest->BufSize)
 429                         IncreaseBuf(dest, 0, nChars + 1);
 430                 memcpy(dest->buf, Source->buf + Offset, nChars);
 431                 dest->BufUsed = nChars;
 432                 dest->buf[dest->BufUsed] = '\0';
 433                 return nChars;
 434         }
 435         NCharsRemain = Source->BufUsed - Offset;
 436         if (NCharsRemain > dest->BufSize)
 437                 IncreaseBuf(dest, 0, NCharsRemain + 1);
 438         memcpy(dest->buf, Source->buf + Offset, NCharsRemain);
 439         dest->BufUsed = NCharsRemain;
 440         dest->buf[dest->BufUsed] = '\0';
 441         return NCharsRemain;
 442 }
 443
 444
 445 void StrBufVAppendPrintf(StrBuf *Buf, const char *format, va_list ap)
 446 {
 447         size_t nWritten = Buf->BufSize + 1;
 448         size_t Offset = Buf->BufUsed;
 449         size_t newused = Offset + nWritten;
 450
 451         while (newused >= Buf->BufSize) {
 452                 nWritten = vsnprintf(Buf->buf + Offset,
 453                                      Buf->BufSize - Offset,
 454                                      format, ap);
 455                 newused = Offset + nWritten;
 456                 if (newused >= Buf->BufSize)
 457                         IncreaseBuf(Buf, 1, 0);
 458                 else
 459                         Buf->BufUsed = Offset + nWritten ;
 460
 461         }
 462 }
 463
 464 void StrBufAppendPrintf(StrBuf *Buf, const char *format, ...)
 465 {
 466         size_t nWritten = Buf->BufSize + 1;
 467         size_t Offset = Buf->BufUsed;
 468         size_t newused = Offset + nWritten;
 469         va_list arg_ptr;
 470
 471         while (newused >= Buf->BufSize) {
 472                 va_start(arg_ptr, format);
 473                 nWritten = vsnprintf(Buf->buf + Offset,
 474                                      Buf->BufSize - Offset,
 475                                      format, arg_ptr);
 476                 va_end(arg_ptr);
 477                 newused = Offset + nWritten;
 478                 if (newused >= Buf->BufSize)
 479                         IncreaseBuf(Buf, 1, 0);
 480                 else
 481                         Buf->BufUsed = Offset + nWritten ;
 482
 483         }
 484 }
 485
 486 void StrBufPrintf(StrBuf *Buf, const char *format, ...)
 487 {
 488         size_t nWritten = Buf->BufSize + 1;
 489         va_list arg_ptr;
 490
 491         while (nWritten >= Buf->BufSize) {
 492                 va_start(arg_ptr, format);
 493                 nWritten = vsnprintf(Buf->buf, Buf->BufSize, format, arg_ptr);
 494                 va_end(arg_ptr);
 495                 Buf->BufUsed = nWritten ;
 496                 if (nWritten >= Buf->BufSize)
 497                         IncreaseBuf(Buf, 0, 0);
 498         }
 499 }
 500
 501
 502 /**
 503  * \brief a string tokenizer
 504  * \param dest Destination StringBuffer
 505  * \param Source StringBuffer to read into
 506  * \param separator tokenizer param
 507  * \returns -1 if not found, else length of token.
 508  */
 509 int StrBufExtract_token(StrBuf *dest, const StrBuf *Source, int parmnum, char separator)
 510 {
 511         const char *s, *e;              //* source * /
 512         int len = 0;                    //* running total length of extracted string * /
 513         int current_token = 0;          //* token currently being processed * /
 514
 515         if ((Source == NULL) || (Source->BufUsed ==0)) {
 516                 return(-1);
 517         }
 518         s = Source->buf;
 519         e = s + Source->BufUsed;
 520         if (dest == NULL) {
 521                 return(-1);
 522         }
 523
 524         //cit_backtrace();
 525         //lprintf (CTDL_DEBUG, "test >: n: %d sep: %c source: %s \n willi \n", parmnum, separator, source);
 526         dest->buf[0] = '\0';
 527         dest->BufUsed = 0;
 528
 529         while ((s<e) && !IsEmptyStr(s)) {
 530                 if (*s == separator) {
 531                         ++current_token;
 532                 }
 533                 if (len >= dest->BufSize)
 534                         if (!IncreaseBuf(dest, 1, -1))
 535                                 break;
 536                 if ( (current_token == parmnum) &&
 537                      (*s != separator)) {
 538                         dest->buf[len] = *s;
 539                         ++len;
 540                 }
 541                 else if (current_token > parmnum) {
 542                         break;
 543                 }
 544                 ++s;
 545         }
 546
 547         dest->buf[len] = '\0';
 548         dest->BufUsed = len;
 549
 550         if (current_token < parmnum) {
 551                 //lprintf (CTDL_DEBUG,"test <!: %s\n", dest);
 552                 return(-1);
 553         }
 554         //lprintf (CTDL_DEBUG,"test <: %d; %s\n", len, dest);
 555         return(len);
 556 }
 557
 558
 559 /*
 560  * extract_int()  -  extract an int parm w/o supplying a buffer
 561  */
 562 int StrBufExtract_int(const StrBuf* Source, int parmnum, char separator)
 563 {
 564         StrBuf tmp;
 565         char buf[64];
 566
 567         tmp.buf = buf;
 568         buf[0] = '\0';
 569         tmp.BufSize = 64;
 570         tmp.BufUsed = 0;
 571         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 572                 return(atoi(buf));
 573         else
 574                 return 0;
 575 }
 576
 577 /*
 578  * extract_long()  -  extract an long parm w/o supplying a buffer
 579  */
 580 long StrBufExtract_long(const StrBuf* Source, int parmnum, char separator)
 581 {
 582         StrBuf tmp;
 583         char buf[64];
 584
 585         tmp.buf = buf;
 586         buf[0] = '\0';
 587         tmp.BufSize = 64;
 588         tmp.BufUsed = 0;
 589         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 590                 return(atoi(buf));
 591         else
 592                 return 0;
 593 }
 594
 595
 596 /*
 597  * extract_unsigned_long() - extract an unsigned long parm
 598  */
 599 unsigned long StrBufExtract_unsigned_long(const StrBuf* Source, int parmnum, char separator)
 600 {
 601         StrBuf tmp;
 602         char buf[64];
 603
 604         tmp.buf = buf;
 605         buf[0] = '\0';
 606         tmp.BufSize = 64;
 607         tmp.BufUsed = 0;
 608         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 609                 return(atoi(buf));
 610         else
 611                 return 0;
 612 }
 613
 614
 615
 616 /**
 617  * \brief Input binary data from socket
 618  * \param buf the buffer to get the input to
 619  * \param bytes the maximal number of bytes to read
 620  */
 621 int StrBufTCP_read_line(StrBuf *buf, int *fd, int append, const char **Error)
 622 {
 623         int len, rlen, slen;
 624
 625         if (!append)
 626                 FlushStrBuf(buf);
 627
 628         slen = len = buf->BufUsed;
 629         while (1) {
 630                 rlen = read(*fd, &buf->buf[len], 1);
 631                 if (rlen < 1) {
 632                         *Error = strerror(errno);
 633
 634                         close(*fd);
 635                         *fd = -1;
 636
 637                         return -1;
 638                 }
 639                 if (buf->buf[len] == '\n')
 640                         break;
 641                 if (buf->buf[len] != '\r')
 642                         len ++;
 643                 if (!(len < buf->BufSize)) {
 644                         buf->BufUsed = len;
 645                         buf->buf[len+1] = '\0';
 646                         IncreaseBuf(buf, 1, -1);
 647                 }
 648         }
 649         buf->BufUsed = len;
 650         buf->buf[len] = '\0';
 651         return len - slen;
 652 }
 653
 654 /**
 655  * \brief Input binary data from socket
 656  * \param buf the buffer to get the input to
 657  * \param bytes the maximal number of bytes to read
 658  */
 659 int StrBufReadBLOB(StrBuf *Buf, int *fd, int append, long nBytes, const char **Error)
 660 {
 661         fd_set wset;
 662         int fdflags;
 663         int len, rlen, slen;
 664         int nRead = 0;
 665         char *ptr;
 666
 667         if ((Buf == NULL) || (*fd == -1))
 668                 return -1;
 669         if (!append)
 670                 FlushStrBuf(Buf);
 671         if (Buf->BufUsed + nBytes > Buf->BufSize)
 672                 IncreaseBuf(Buf, 1, Buf->BufUsed + nBytes);
 673
 674         ptr = Buf->buf + Buf->BufUsed;
 675
 676         slen = len = Buf->BufUsed;
 677
 678         fdflags = fcntl(*fd, F_GETFL);
 679
 680         while (nRead < nBytes) {
 681                if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 682                         FD_ZERO(&wset);
 683                         FD_SET(*fd, &wset);
 684                         if (select(*fd + 1, NULL, &wset, NULL, NULL) == -1) {
 685                                 *Error = strerror(errno);
 686                                 return -1;
 687                         }
 688                 }
 689
 690                 if ((rlen = read(*fd,
 691                                  ptr,
 692                                  nBytes - nRead)) == -1) {
 693                         close(*fd);
 694                         *fd = -1;
 695                         *Error = strerror(errno);
 696                         return rlen;
 697                 }
 698                 nRead += rlen;
 699                 Buf->BufUsed += rlen;
 700         }
 701         Buf->buf[Buf->BufUsed] = '\0';
 702         return nRead;
 703 }
 704
 705 void StrBufCutLeft(StrBuf *Buf, int nChars)
 706 {
 707         if (nChars >= Buf->BufUsed) {
 708                 FlushStrBuf(Buf);
 709                 return;
 710         }
 711         memmove(Buf->buf, Buf->buf + nChars, Buf->BufUsed - nChars);
 712         Buf->BufUsed -= nChars;
 713         Buf->buf[Buf->BufUsed] = '\0';
 714 }
 715
 716 void StrBufCutRight(StrBuf *Buf, int nChars)
 717 {
 718         if (nChars >= Buf->BufUsed) {
 719                 FlushStrBuf(Buf);
 720                 return;
 721         }
 722         Buf->BufUsed -= nChars;
 723         Buf->buf[Buf->BufUsed] = '\0';
 724 }
 725
 726
 727 /*
 728  * string conversion function
 729  */
 730 void StrBufEUid_unescapize(StrBuf *target, const StrBuf *source)
 731 {
 732         int a, b, len;
 733         char hex[3];
 734
 735         if (target != NULL)
 736                 FlushStrBuf(target);
 737
 738         if (source == NULL ||target == NULL)
 739         {
 740                 return;
 741         }
 742
 743         len = source->BufUsed;
 744         for (a = 0; a < len; ++a) {
 745                 if (target->BufUsed >= target->BufSize)
 746                         IncreaseBuf(target, 1, -1);
 747
 748                 if (source->buf[a] == '=') {
 749                         hex[0] = source->buf[a + 1];
 750                         hex[1] = source->buf[a + 2];
 751                         hex[2] = 0;
 752                         b = 0;
 753                         sscanf(hex, "%02x", &b);
 754                         target->buf[target->BufUsed] = b;
 755                         target->buf[++target->BufUsed] = 0;
 756                         a += 2;
 757                 }
 758                 else {
 759                         target->buf[target->BufUsed] = source->buf[a];
 760                         target->buf[++target->BufUsed] = 0;
 761                 }
 762         }
 763 }
 764
 765
 766 /*
 767  * string conversion function
 768  */
 769 void StrBufEUid_escapize(StrBuf *target, const StrBuf *source)
 770 {
 771         int i, len;
 772
 773         if (target != NULL)
 774                 FlushStrBuf(target);
 775
 776         if (source == NULL ||target == NULL)
 777         {
 778                 return;
 779         }
 780
 781         len = source->BufUsed;
 782         for (i=0; i<len; ++i) {
 783                 if (target->BufUsed + 4 >= target->BufSize)
 784                         IncreaseBuf(target, 1, -1);
 785                 if ( (isalnum(source->buf[i])) ||
 786                      (source->buf[i]=='-') ||
 787                      (source->buf[i]=='_') ) {
 788                         target->buf[target->BufUsed++] = source->buf[i];
 789                 }
 790                 else {
 791                         sprintf(&target->buf[target->BufUsed],
 792                                 "=%02X",
 793                                 (0xFF &source->buf[i]));
 794                         target->BufUsed += 3;
 795                 }
 796         }
 797         target->buf[target->BufUsed + 1] = '\0';
 798 }
 799
 800 /*
 801  * \brief uses the same calling syntax as compress2(), but it
 802  * creates a stream compatible with HTTP "Content-encoding: gzip"
 803  */
 804 #ifdef HAVE_ZLIB
 805 #define DEF_MEM_LEVEL 8 /*< memlevel??? */
 806 #define OS_CODE 0x03    /*< unix */
 807 int ZEXPORT compress_gzip(Bytef * dest,         /*< compressed buffer*/
 808                           size_t * destLen,     /*< length of the compresed data */
 809                           const Bytef * source, /*< source to encode */
 810                           uLong sourceLen,      /*< length of source to encode */
 811                           int level)            /*< compression level */
 812 {
 813         const int gz_magic[2] = { 0x1f, 0x8b }; /* gzip magic header */
 814
 815         /* write gzip header */
 816         snprintf((char *) dest, *destLen,
 817                  "%c%c%c%c%c%c%c%c%c%c",
 818                  gz_magic[0], gz_magic[1], Z_DEFLATED,
 819                  0 /*flags */ , 0, 0, 0, 0 /*time */ , 0 /* xflags */ ,
 820                  OS_CODE);
 821
 822         /* normal deflate */
 823         z_stream stream;
 824         int err;
 825         stream.next_in = (Bytef *) source;
 826         stream.avail_in = (uInt) sourceLen;
 827         stream.next_out = dest + 10L;   // after header
 828         stream.avail_out = (uInt) * destLen;
 829         if ((uLong) stream.avail_out != *destLen)
 830                 return Z_BUF_ERROR;
 831
 832         stream.zalloc = (alloc_func) 0;
 833         stream.zfree = (free_func) 0;
 834         stream.opaque = (voidpf) 0;
 835
 836         err = deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS,
 837                            DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
 838         if (err != Z_OK)
 839                 return err;
 840
 841         err = deflate(&stream, Z_FINISH);
 842         if (err != Z_STREAM_END) {
 843                 deflateEnd(&stream);
 844                 return err == Z_OK ? Z_BUF_ERROR : err;
 845         }
 846         *destLen = stream.total_out + 10L;
 847
 848         /* write CRC and Length */
 849         uLong crc = crc32(0L, source, sourceLen);
 850         int n;
 851         for (n = 0; n < 4; ++n, ++*destLen) {
 852                 dest[*destLen] = (int) (crc & 0xff);
 853                 crc >>= 8;
 854         }
 855         uLong len = stream.total_in;
 856         for (n = 0; n < 4; ++n, ++*destLen) {
 857                 dest[*destLen] = (int) (len & 0xff);
 858                 len >>= 8;
 859         }
 860         err = deflateEnd(&stream);
 861         return err;
 862 }
 863 #endif
 864
 865
 866 /**
 867  * Attention! If you feed this a Const String, you must maintain the uncompressed buffer yourself!
 868  */
 869 int CompressBuffer(StrBuf *Buf)
 870 {
 871 #ifdef HAVE_ZLIB
 872         char *compressed_data = NULL;
 873         size_t compressed_len, bufsize;
 874
 875         bufsize = compressed_len = ((Buf->BufUsed * 101) / 100) + 100;
 876         compressed_data = malloc(compressed_len);
 877
 878         if (compress_gzip((Bytef *) compressed_data,
 879                           &compressed_len,
 880                           (Bytef *) Buf->buf,
 881                           (uLongf) Buf->BufUsed, Z_BEST_SPEED) == Z_OK) {
 882                 if (!ConstBuf)
 883                         free(Buf->buf);
 884                 Buf->buf = compressed_data;
 885                 Buf->BufUsed = compressed_len;
 886                 Buf->BufSize = bufsize;
 887                 return 1;
 888         } else {
 889                 free(compressed_data);
 890         }
 891 #endif  /* HAVE_ZLIB */
 892         return 0;
 893 }
 894
 895 int StrBufDecodeBase64(StrBuf *Buf)
 896 {
 897         char *xferbuf;
 898         size_t siz;
 899         if (Buf == NULL) return -1;
 900
 901         xferbuf = (char*) malloc(Buf->BufSize);
 902         siz = CtdlDecodeBase64(xferbuf,
 903                                Buf->buf,
 904                                Buf->BufUsed);
 905         free(Buf->buf);
 906         Buf->buf = xferbuf;
 907         Buf->BufUsed = siz;
 908         return siz;
 909 }
 910
 911
 912 /*
 913  * remove escaped strings from i.e. the url string (like %20 for blanks)
 914  */
 915 long StrBufUnescape(StrBuf *Buf, int StripBlanks)
 916 {
 917         int a, b;
 918         char hex[3];
 919         long len;
 920
 921         while ((Buf->BufUsed > 0) && (isspace(Buf->buf[Buf->BufUsed - 1]))){
 922                 Buf->buf[Buf->BufUsed - 1] = '\0';
 923                 Buf->BufUsed --;
 924         }
 925
 926         a = 0;
 927         while (a < Buf->BufUsed) {
 928                 if (Buf->buf[a] == '+')
 929                         Buf->buf[a] = ' ';
 930                 else if (Buf->buf[a] == '%') {
 931                         /* don't let % chars through, rather truncate the input. */
 932                         if (a + 2 > Buf->BufUsed) {
 933                                 Buf->buf[a] = '\0';
 934                                 Buf->BufUsed = a;
 935                         }
 936                         else {
 937                                 hex[0] = Buf->buf[a + 1];
 938                                 hex[1] = Buf->buf[a + 2];
 939                                 hex[2] = 0;
 940                                 b = 0;
 941                                 sscanf(hex, "%02x", &b);
 942                                 Buf->buf[a] = (char) b;
 943                                 len = Buf->BufUsed - a - 2;
 944                                 if (len > 0)
 945                                         memmove(&Buf->buf[a + 1], &Buf->buf[a + 3], len);
 946
 947                                 Buf->BufUsed -=2;
 948                         }
 949                 }
 950                 a++;
 951         }
 952         return a;
 953 }
 954
 955
 956 /**
 957  * \brief       RFC2047-encode a header field if necessary.
 958  *              If no non-ASCII characters are found, the string
 959  *              will be copied verbatim without encoding.
 960  *
 961  * \param       target          Target buffer.
 962  * \param       source          Source string to be encoded.
 963  * \returns     encoded length; -1 if non success.
 964  */
 965 int StrBufRFC2047encode(StrBuf **target, const StrBuf *source)
 966 {
 967         const char headerStr[] = "=?UTF-8?Q?";
 968         int need_to_encode = 0;
 969         int i = 0;
 970         unsigned char ch;
 971
 972         if ((source == NULL) ||
 973             (target == NULL))
 974             return -1;
 975
 976         while ((i < source->BufUsed) &&
 977                (!IsEmptyStr (&source->buf[i])) &&
 978                (need_to_encode == 0)) {
 979                 if (((unsigned char) source->buf[i] < 32) ||
 980                     ((unsigned char) source->buf[i] > 126)) {
 981                         need_to_encode = 1;
 982                 }
 983                 i++;
 984         }
 985
 986         if (!need_to_encode) {
 987                 if (*target == NULL) {
 988                         *target = NewStrBufPlain(source->buf, source->BufUsed);
 989                 }
 990                 else {
 991                         FlushStrBuf(*target);
 992                         StrBufAppendBuf(*target, source, 0);
 993                 }
 994                 return (*target)->BufUsed;
 995         }
 996         if (*target == NULL)
 997                 *target = NewStrBufPlain(NULL, sizeof(headerStr) + source->BufUsed * 2);
 998         else if (sizeof(headerStr) + source->BufUsed > (*target)->BufSize)
 999                 IncreaseBuf(*target, sizeof(headerStr) + source->BufUsed, 0);
1000         memcpy ((*target)->buf, headerStr, sizeof(headerStr) - 1);
1001         (*target)->BufUsed = sizeof(headerStr) - 1;
1002         for (i=0; (i < source->BufUsed); ++i) {
1003                 if ((*target)->BufUsed + 4 > (*target)->BufSize)
1004                         IncreaseBuf(*target, 1, 0);
1005                 ch = (unsigned char) source->buf[i];
1006                 if ((ch < 32) || (ch > 126) || (ch == 61)) {
1007                         sprintf(&(*target)->buf[(*target)->BufUsed], "=%02X", ch);
1008                         (*target)->BufUsed += 3;
1009                 }
1010                 else {
1011                         (*target)->buf[(*target)->BufUsed] = ch;
1012                         (*target)->BufUsed++;
1013                 }
1014         }
1015
1016         if ((*target)->BufUsed + 4 > (*target)->BufSize)
1017                 IncreaseBuf(*target, 1, 0);
1018
1019         (*target)->buf[(*target)->BufUsed++] = '?';
1020         (*target)->buf[(*target)->BufUsed++] = '=';
1021         (*target)->buf[(*target)->BufUsed] = '\0';
1022         return (*target)->BufUsed;;
1023 }
1024
1025 void StrBufReplaceChars(StrBuf *buf, char search, char replace)
1026 {
1027         long i;
1028         if (buf == NULL)
1029                 return;
1030         for (i=0; i<buf->BufUsed; i++)
1031                 if (buf->buf[i] == search)
1032                         buf->buf[i] = replace;
1033
1034 }