stream/stream.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #ifndef __MINGW32__
  26 #include <sys/ioctl.h>
  27 #include <sys/wait.h>
  28 #endif
  29 #include <fcntl.h>
  30 #include <strings.h>
  31 #include <assert.h>
  32
  33 #include "talloc.h"
  34
  35 #include "config.h"
  36
  37 #if HAVE_WINSOCK2_H
  38 #include <winsock2.h>
  39 #endif
  40
  41 #include <libavutil/common.h>
  42
  43 #include "mp_msg.h"
  44 #include "osdep/shmem.h"
  45 #include "osdep/timer.h"
  46 #include "network.h"
  47 #include "stream.h"
  48 #include "libmpdemux/demuxer.h"
  49 #include "ffmpeg_files/intreadwrite.h"
  50
  51 #include "m_option.h"
  52 #include "m_struct.h"
  53
  54 #include "cache2.h"
  55
  56 struct input_ctx;
  57 static int (*stream_check_interrupt_cb)(struct input_ctx *ctx, int time);
  58 static struct input_ctx *stream_check_interrupt_ctx;
  59
  60 extern const stream_info_t stream_info_vcd;
  61 extern const stream_info_t stream_info_cdda;
  62 extern const stream_info_t stream_info_netstream;
  63 extern const stream_info_t stream_info_pnm;
  64 extern const stream_info_t stream_info_asf;
  65 extern const stream_info_t stream_info_rtsp;
  66 extern const stream_info_t stream_info_rtp;
  67 extern const stream_info_t stream_info_udp;
  68 extern const stream_info_t stream_info_http1;
  69 extern const stream_info_t stream_info_http2;
  70 extern const stream_info_t stream_info_dvb;
  71 extern const stream_info_t stream_info_tv;
  72 extern const stream_info_t stream_info_radio;
  73 extern const stream_info_t stream_info_pvr;
  74 extern const stream_info_t stream_info_ftp;
  75 extern const stream_info_t stream_info_vstream;
  76 extern const stream_info_t stream_info_dvdnav;
  77 extern const stream_info_t stream_info_smb;
  78 extern const stream_info_t stream_info_sdp;
  79 extern const stream_info_t stream_info_rtsp_sip;
  80
  81 extern const stream_info_t stream_info_cue;
  82 extern const stream_info_t stream_info_null;
  83 extern const stream_info_t stream_info_mf;
  84 extern const stream_info_t stream_info_ffmpeg;
  85 extern const stream_info_t stream_info_file;
  86 extern const stream_info_t stream_info_ifo;
  87 extern const stream_info_t stream_info_dvd;
  88 extern const stream_info_t stream_info_bluray;
  89
  90 static const stream_info_t* const auto_open_streams[] = {
  91 #ifdef CONFIG_VCD
  92   &stream_info_vcd,
  93 #endif
  94 #ifdef CONFIG_CDDA
  95   &stream_info_cdda,
  96 #endif
  97 #ifdef CONFIG_NETWORKING
  98   &stream_info_netstream,
  99   &stream_info_http1,
 100   &stream_info_asf,
 101   &stream_info_pnm,
 102   &stream_info_rtsp,
 103 #ifdef CONFIG_LIVE555
 104   &stream_info_sdp,
 105   &stream_info_rtsp_sip,
 106 #endif
 107   &stream_info_rtp,
 108   &stream_info_udp,
 109   &stream_info_http2,
 110 #endif
 111 #ifdef CONFIG_DVBIN
 112   &stream_info_dvb,
 113 #endif
 114 #ifdef CONFIG_TV
 115   &stream_info_tv,
 116 #endif
 117 #ifdef CONFIG_RADIO
 118   &stream_info_radio,
 119 #endif
 120 #ifdef CONFIG_PVR
 121   &stream_info_pvr,
 122 #endif
 123 #ifdef CONFIG_FTP
 124   &stream_info_ftp,
 125 #endif
 126 #ifdef CONFIG_VSTREAM
 127   &stream_info_vstream,
 128 #endif
 129 #ifdef CONFIG_LIBSMBCLIENT
 130   &stream_info_smb,
 131 #endif
 132   &stream_info_cue,
 133 #ifdef CONFIG_DVDREAD
 134   &stream_info_ifo,
 135   &stream_info_dvd,
 136 #endif
 137 #ifdef CONFIG_DVDNAV
 138   &stream_info_dvdnav,
 139 #endif
 140 #ifdef CONFIG_LIBBLURAY
 141   &stream_info_bluray,
 142 #endif
 143 #ifdef CONFIG_FFMPEG
 144   &stream_info_ffmpeg,
 145 #endif
 146
 147   &stream_info_null,
 148   &stream_info_mf,
 149   &stream_info_file,
 150   NULL
 151 };
 152
 153 static stream_t *open_stream_plugin(const stream_info_t *sinfo,
 154                                     const char *filename,
 155                                     int mode, struct MPOpts *options,
 156                                     int *file_format, int *ret,
 157                                     char **redirected_url)
 158 {
 159   void* arg = NULL;
 160   stream_t* s;
 161   m_struct_t* desc = (m_struct_t*)sinfo->opts;
 162
 163   // Parse options
 164   if(desc) {
 165     arg = m_struct_alloc(desc);
 166     if(sinfo->opts_url) {
 167       m_option_t url_opt =
 168         { "stream url", arg , CONF_TYPE_CUSTOM_URL, 0, 0 ,0, sinfo->opts };
 169       if(m_option_parse(&url_opt,"stream url",filename,arg,M_CONFIG_FILE) < 0) {
 170         mp_msg(MSGT_OPEN,MSGL_ERR, "URL parsing failed on url %s\n",filename);
 171         m_struct_free(desc,arg);
 172         return NULL;
 173       }
 174     }
 175   }
 176   s = new_stream(-2,-2);
 177   s->opts = options;
 178   s->url=strdup(filename);
 179   s->flags |= mode;
 180   *ret = sinfo->open(s,mode,arg,file_format);
 181   if((*ret) != STREAM_OK) {
 182 #ifdef CONFIG_NETWORKING
 183     if (*ret == STREAM_REDIRECTED && redirected_url) {
 184         if (s->streaming_ctrl && s->streaming_ctrl->url
 185             && s->streaming_ctrl->url->url)
 186           *redirected_url = strdup(s->streaming_ctrl->url->url);
 187         else
 188           *redirected_url = NULL;
 189     }
 190     streaming_ctrl_free(s->streaming_ctrl);
 191 #endif
 192     free(s->url);
 193     free(s);
 194     return NULL;
 195   }
 196   if(s->type <= -2)
 197     mp_msg(MSGT_OPEN,MSGL_WARN, "Warning streams need a type !!!!\n");
 198   if(s->flags & MP_STREAM_SEEK && !s->seek)
 199     s->flags &= ~MP_STREAM_SEEK;
 200   if(s->seek && !(s->flags & MP_STREAM_SEEK))
 201     s->flags |= MP_STREAM_SEEK;
 202
 203   s->mode = mode;
 204
 205   mp_msg(MSGT_OPEN,MSGL_V, "STREAM: [%s] %s\n",sinfo->name,filename);
 206   mp_msg(MSGT_OPEN,MSGL_V, "STREAM: Description: %s\n",sinfo->info);
 207   mp_msg(MSGT_OPEN,MSGL_V, "STREAM: Author: %s\n", sinfo->author);
 208   mp_msg(MSGT_OPEN,MSGL_V, "STREAM: Comment: %s\n", sinfo->comment);
 209
 210   return s;
 211 }
 212
 213
 214 stream_t *open_stream_full(const char *filename, int mode,
 215                            struct MPOpts *options, int *file_format)
 216 {
 217   int i,j,l,r;
 218   const stream_info_t* sinfo;
 219   stream_t* s;
 220   char *redirected_url = NULL;
 221
 222   for(i = 0 ; auto_open_streams[i] ; i++) {
 223     sinfo = auto_open_streams[i];
 224     if(!sinfo->protocols) {
 225       mp_msg(MSGT_OPEN,MSGL_WARN, "Stream type %s has protocols == NULL, it's a bug\n", sinfo->name);
 226       continue;
 227     }
 228     for(j = 0 ; sinfo->protocols[j] ; j++) {
 229       l = strlen(sinfo->protocols[j]);
 230       // l == 0 => Don't do protocol matching (ie network and filenames)
 231       if((l == 0 && !strstr(filename, "://")) ||
 232          ((strncasecmp(sinfo->protocols[j],filename,l) == 0) &&
 233                       (strncmp("://",filename+l,3) == 0))) {
 234         *file_format = DEMUXER_TYPE_UNKNOWN;
 235         s = open_stream_plugin(sinfo,filename,mode,options,file_format,&r,
 236                                 &redirected_url);
 237         if(s) return s;
 238         if(r == STREAM_REDIRECTED && redirected_url) {
 239           mp_msg(MSGT_OPEN,MSGL_V, "[%s] open %s redirected to %s\n",
 240                  sinfo->info, filename, redirected_url);
 241           s = open_stream_full(redirected_url, mode, options, file_format);
 242           free(redirected_url);
 243           return s;
 244         }
 245         else if(r != STREAM_UNSUPPORTED) {
 246           mp_tmsg(MSGT_OPEN,MSGL_ERR, "Failed to open %s.\n",filename);
 247           return NULL;
 248         }
 249         break;
 250       }
 251     }
 252   }
 253
 254   mp_msg(MSGT_OPEN,MSGL_ERR, "No stream found to handle url %s\n",filename);
 255   return NULL;
 256 }
 257
 258 stream_t *open_output_stream(const char *filename, struct MPOpts *options)
 259 {
 260   int file_format; //unused
 261   if(!filename) {
 262     mp_msg(MSGT_OPEN,MSGL_ERR,"open_output_stream(), NULL filename, report this bug\n");
 263     return NULL;
 264   }
 265
 266   return open_stream_full(filename,STREAM_WRITE,options,&file_format);
 267 }
 268
 269 //=================== STREAMER =========================
 270
 271 void stream_capture_do(stream_t *s)
 272 {
 273   if (fwrite(s->buffer, s->buf_len, 1, s->capture_file) < 1) {
 274     mp_tmsg(MSGT_GLOBAL, MSGL_ERR, "Error writing capture file: %s\n",
 275             strerror(errno));
 276     fclose(s->capture_file);
 277     s->capture_file = NULL;
 278   }
 279 }
 280
 281 int stream_read_internal(stream_t *s, void *buf, int len)
 282 {
 283   int orig_len = len;
 284   // we will retry even if we already reached EOF previously.
 285   switch(s->type){
 286   case STREAMTYPE_STREAM:
 287 #ifdef CONFIG_NETWORKING
 288     if( s->streaming_ctrl!=NULL && s->streaming_ctrl->streaming_read ) {
 289       len=s->streaming_ctrl->streaming_read(s->fd, buf, len, s->streaming_ctrl);
 290     } else
 291 #endif
 292     if (s->fill_buffer)
 293       len = s->fill_buffer(s, buf, len);
 294     else
 295       len = read(s->fd, buf, len);
 296     break;
 297   case STREAMTYPE_DS:
 298     len = demux_read_data((demux_stream_t*)s->priv, buf, len);
 299     break;
 300
 301
 302   default:
 303     len= s->fill_buffer ? s->fill_buffer(s, buf, len) : 0;
 304   }
 305   if(len<=0){
 306     // dvdnav has some horrible hacks to "suspend" reads,
 307     // we need to skip this code or seeks will hang.
 308     if (!s->eof && s->type != STREAMTYPE_DVDNAV) {
 309       // just in case this is an error e.g. due to network
 310       // timeout reset and retry
 311       // Seeking is used as a hack to make network streams
 312       // reopen the connection, ideally they would implement
 313       // e.g. a STREAM_CTRL_RECONNECT to do this
 314       off_t pos = s->pos;
 315       s->eof=1;
 316       stream_reset(s);
 317       stream_seek_internal(s, pos);
 318       // make sure EOF is set to ensure no endless loops
 319       s->eof=1;
 320       return stream_read_internal(s, buf, orig_len);
 321     }
 322     s->eof=1;
 323     return 0;
 324   }
 325   // When reading succeeded we are obviously not at eof.
 326   // This e.g. avoids issues with eof getting stuck when lavf seeks in MPEG-TS
 327   s->eof=0;
 328   s->pos+=len;
 329   return len;
 330 }
 331
 332 int stream_fill_buffer(stream_t *s){
 333   int len = stream_read_internal(s, s->buffer, STREAM_BUFFER_SIZE);
 334   if (len <= 0)
 335     return 0;
 336   s->buf_pos=0;
 337   s->buf_len=len;
 338 //  printf("[%d]",len);fflush(stdout);
 339   if (s->capture_file)
 340     stream_capture_do(s);
 341   return len;
 342 }
 343
 344 int stream_write_buffer(stream_t *s, unsigned char *buf, int len) {
 345   int rd;
 346   if(!s->write_buffer)
 347     return -1;
 348   rd = s->write_buffer(s, buf, len);
 349   if(rd < 0)
 350     return -1;
 351   s->pos += rd;
 352   assert(rd == len && "stream_write_buffer(): unexpected short write");
 353   return rd;
 354 }
 355
 356 int stream_seek_internal(stream_t *s, off_t newpos)
 357 {
 358 if(newpos==0 || newpos!=s->pos){
 359   switch(s->type){
 360   case STREAMTYPE_STREAM:
 361     //s->pos=newpos; // real seek
 362     // Some streaming protocol allow to seek backward and forward
 363     // A function call that return -1 can tell that the protocol
 364     // doesn't support seeking.
 365 #ifdef CONFIG_NETWORKING
 366     if(s->seek) { // new stream seek is much cleaner than streaming_ctrl one
 367       if(!s->seek(s,newpos)) {
 368         mp_msg(MSGT_STREAM,MSGL_ERR, "Seek failed\n");
 369         return 0;
 370       }
 371       break;
 372     }
 373
 374     if( s->streaming_ctrl!=NULL && s->streaming_ctrl->streaming_seek ) {
 375       if( s->streaming_ctrl->streaming_seek( s->fd, newpos, s->streaming_ctrl )<0 ) {
 376         mp_msg(MSGT_STREAM,MSGL_INFO,"Stream not seekable!\n");
 377         return 1;
 378       }
 379       break;
 380     }
 381 #endif
 382     if(newpos<s->pos){
 383       mp_msg(MSGT_STREAM,MSGL_INFO,"Cannot seek backward in linear streams!\n");
 384       return 1;
 385     }
 386     break;
 387   default:
 388     // This should at the beginning as soon as all streams are converted
 389     if(!s->seek)
 390       return 0;
 391     // Now seek
 392     if(!s->seek(s,newpos)) {
 393       mp_msg(MSGT_STREAM,MSGL_ERR, "Seek failed\n");
 394       return 0;
 395     }
 396   }
 397 //   putchar('.');fflush(stdout);
 398 //} else {
 399 //   putchar('%');fflush(stdout);
 400 }
 401   return -1;
 402 }
 403
 404 int stream_seek_long(stream_t *s,off_t pos){
 405   int res;
 406 off_t newpos=0;
 407
 408 //  if( mp_msg_test(MSGT_STREAM,MSGL_DBG3) ) printf("seek_long to 0x%X\n",(unsigned int)pos);
 409
 410   s->buf_pos=s->buf_len=0;
 411
 412   if(s->mode == STREAM_WRITE) {
 413     if(!s->seek || !s->seek(s,pos))
 414       return 0;
 415     return 1;
 416   }
 417
 418   if(s->sector_size)
 419       newpos = (pos/s->sector_size)*s->sector_size;
 420   else
 421       newpos = pos&(~((off_t)STREAM_BUFFER_SIZE-1));
 422
 423 if( mp_msg_test(MSGT_STREAM,MSGL_DBG3) ){
 424   mp_msg(MSGT_STREAM,MSGL_DBG3, "s->pos=%"PRIX64"  newpos=%"PRIX64"  new_bufpos=%"PRIX64"  buflen=%X  \n",
 425     (int64_t)s->pos,(int64_t)newpos,(int64_t)pos,s->buf_len);
 426 }
 427   pos-=newpos;
 428
 429   res = stream_seek_internal(s, newpos);
 430   if (res >= 0)
 431     return res;
 432
 433   while(s->pos<newpos){
 434     if(stream_fill_buffer(s)<=0) break; // EOF
 435   }
 436
 437 s->eof = 0; // EOF reset when seek succeeds.
 438 while (stream_fill_buffer(s) > 0) {
 439   if(pos<=s->buf_len){
 440     s->buf_pos=pos; // byte position in sector
 441     return 1;
 442   }
 443   pos -= s->buf_len;
 444 }
 445 // Fill failed, but seek still is a success.
 446 s->pos += pos;
 447 s->buf_pos = 0;
 448 s->buf_len = 0;
 449
 450 mp_msg(MSGT_STREAM,MSGL_V,
 451        "stream_seek: Seek to/past EOF: no buffer preloaded.\n");
 452 return 1;
 453 }
 454
 455
 456 void stream_reset(stream_t *s){
 457   if(s->eof){
 458     s->pos=0;
 459     s->buf_pos=s->buf_len=0;
 460     s->eof=0;
 461   }
 462   if(s->control) s->control(s,STREAM_CTRL_RESET,NULL);
 463   //stream_seek(s,0);
 464 }
 465
 466 int stream_control(stream_t *s, int cmd, void *arg){
 467   if(!s->control) return STREAM_UNSUPPORTED;
 468 #ifdef CONFIG_STREAM_CACHE
 469   if (s->cache_pid)
 470     return cache_do_control(s, cmd, arg);
 471 #endif
 472   return s->control(s, cmd, arg);
 473 }
 474
 475 stream_t* new_memory_stream(unsigned char* data,int len){
 476   stream_t *s;
 477
 478   if(len < 0)
 479     return NULL;
 480   s=calloc(1, sizeof(stream_t)+len);
 481   s->fd=-1;
 482   s->type=STREAMTYPE_MEMORY;
 483   s->buf_pos=0; s->buf_len=len;
 484   s->start_pos=0; s->end_pos=len;
 485   stream_reset(s);
 486   s->pos=len;
 487   memcpy(s->buffer,data,len);
 488   return s;
 489 }
 490
 491 stream_t* new_stream(int fd,int type){
 492   stream_t *s=calloc(1, sizeof(stream_t));
 493   if(s==NULL) return NULL;
 494
 495 #if HAVE_WINSOCK2_H
 496   {
 497     WSADATA wsdata;
 498     int temp = WSAStartup(0x0202, &wsdata); // there might be a better place for this (-> later)
 499     mp_msg(MSGT_STREAM,MSGL_V,"WINSOCK2 init: %i\n", temp);
 500   }
 501 #endif
 502
 503   s->fd=fd;
 504   s->type=type;
 505   s->buf_pos=s->buf_len=0;
 506   s->start_pos=s->end_pos=0;
 507   s->priv=NULL;
 508   s->url=NULL;
 509   s->cache_pid=0;
 510   stream_reset(s);
 511   return s;
 512 }
 513
 514 void free_stream(stream_t *s){
 515 //  printf("\n*** free_stream() called ***\n");
 516 #ifdef CONFIG_STREAM_CACHE
 517     cache_uninit(s);
 518 #endif
 519   if (s->capture_file) {
 520     fclose(s->capture_file);
 521     s->capture_file = NULL;
 522   }
 523
 524   if(s->close) s->close(s);
 525   if(s->fd>0){
 526     /* on unix we define closesocket to close
 527        on windows however we have to distinguish between
 528        network socket and file */
 529     if(s->url && strstr(s->url,"://"))
 530       closesocket(s->fd);
 531     else close(s->fd);
 532   }
 533 #if HAVE_WINSOCK2_H
 534   mp_msg(MSGT_STREAM,MSGL_V,"WINSOCK2 uninit\n");
 535   WSACleanup(); // there might be a better place for this (-> later)
 536 #endif
 537   // Disabled atm, i don't like that. s->priv can be anything after all
 538   // streams should destroy their priv on close
 539   //free(s->priv);
 540   free(s->url);
 541   free(s);
 542 }
 543
 544 stream_t* new_ds_stream(demux_stream_t *ds) {
 545   stream_t* s = new_stream(-1,STREAMTYPE_DS);
 546   s->priv = ds;
 547   return s;
 548 }
 549
 550 void stream_set_interrupt_callback(int (*cb)(struct input_ctx *, int),
 551                                    struct input_ctx *ctx)
 552 {
 553     stream_check_interrupt_cb = cb;
 554     stream_check_interrupt_ctx = ctx;
 555 }
 556
 557 int stream_check_interrupt(int time) {
 558     if(!stream_check_interrupt_cb) {
 559         usec_sleep(time * 1000);
 560         return 0;
 561     }
 562     return stream_check_interrupt_cb(stream_check_interrupt_ctx, time);
 563 }
 564
 565 /**
 566  * Helper function to read 16 bits little-endian and advance pointer
 567  */
 568 static uint16_t get_le16_inc(const uint8_t **buf)
 569 {
 570   uint16_t v = AV_RL16(*buf);
 571   *buf += 2;
 572   return v;
 573 }
 574
 575 /**
 576  * Helper function to read 16 bits big-endian and advance pointer
 577  */
 578 static uint16_t get_be16_inc(const uint8_t **buf)
 579 {
 580   uint16_t v = AV_RB16(*buf);
 581   *buf += 2;
 582   return v;
 583 }
 584
 585 /**
 586  * Find a newline character in buffer
 587  * \param buf buffer to search
 588  * \param len amount of bytes to search in buffer, may not overread
 589  * \param utf16 chose between UTF-8/ASCII/other and LE and BE UTF-16
 590  *              0 = UTF-8/ASCII/other, 1 = UTF-16-LE, 2 = UTF-16-BE
 591  */
 592 static const uint8_t *find_newline(const uint8_t *buf, int len, int utf16)
 593 {
 594   uint32_t c;
 595   const uint8_t *end = buf + len;
 596   switch (utf16) {
 597   case 0:
 598     return (uint8_t *)memchr(buf, '\n', len);
 599   case 1:
 600     while (buf < end - 1) {
 601       GET_UTF16(c, buf < end - 1 ? get_le16_inc(&buf) : 0, return NULL;)
 602       if (buf <= end && c == '\n')
 603         return buf - 1;
 604     }
 605     break;
 606   case 2:
 607     while (buf < end - 1) {
 608       GET_UTF16(c, buf < end - 1 ? get_be16_inc(&buf) : 0, return NULL;)
 609       if (buf <= end && c == '\n')
 610         return buf - 1;
 611     }
 612     break;
 613   }
 614   return NULL;
 615 }
 616
 617 /**
 618  * Copy a number of bytes, converting to UTF-8 if input is UTF-16
 619  * \param dst buffer to copy to
 620  * \param dstsize size of dst buffer
 621  * \param src buffer to copy from
 622  * \param len amount of bytes to copy from src
 623  * \param utf16 chose between UTF-8/ASCII/other and LE and BE UTF-16
 624  *              0 = UTF-8/ASCII/other, 1 = UTF-16-LE, 2 = UTF-16-BE
 625  */
 626 static int copy_characters(uint8_t *dst, int dstsize,
 627                            const uint8_t *src, int *len, int utf16)
 628 {
 629   uint32_t c;
 630   uint8_t *dst_end = dst + dstsize;
 631   const uint8_t *end = src + *len;
 632   switch (utf16) {
 633   case 0:
 634     if (*len > dstsize)
 635       *len = dstsize;
 636     memcpy(dst, src, *len);
 637     return *len;
 638   case 1:
 639     while (src < end - 1 && dst_end - dst > 8) {
 640       uint8_t tmp;
 641       GET_UTF16(c, src < end - 1 ? get_le16_inc(&src) : 0, ;)
 642       PUT_UTF8(c, tmp, *dst++ = tmp;)
 643     }
 644     *len -= end - src;
 645     return dstsize - (dst_end - dst);
 646   case 2:
 647     while (src < end - 1 && dst_end - dst > 8) {
 648       uint8_t tmp;
 649       GET_UTF16(c, src < end - 1 ? get_be16_inc(&src) : 0, ;)
 650       PUT_UTF8(c, tmp, *dst++ = tmp;)
 651     }
 652     *len -= end - src;
 653     return dstsize - (dst_end - dst);
 654   }
 655   return 0;
 656 }
 657
 658 unsigned char* stream_read_line(stream_t *s,unsigned char* mem, int max, int utf16) {
 659   int len;
 660   const unsigned char *end;
 661   unsigned char *ptr = mem;
 662   if (max < 1) return NULL;
 663   max--; // reserve one for 0-termination
 664   do {
 665     len = s->buf_len-s->buf_pos;
 666     // try to fill the buffer
 667     if(len <= 0 &&
 668        (!cache_stream_fill_buffer(s) ||
 669         (len = s->buf_len-s->buf_pos) <= 0)) break;
 670     end = find_newline(s->buffer+s->buf_pos, len, utf16);
 671     if(end) len = end - (s->buffer+s->buf_pos) + 1;
 672     if(len > 0 && max > 0) {
 673       int l = copy_characters(ptr, max, s->buffer+s->buf_pos, &len, utf16);
 674       max -= l;
 675       ptr += l;
 676       if (!len)
 677         break;
 678     }
 679     s->buf_pos += len;
 680   } while(!end);
 681   ptr[0] = 0;
 682   if(s->eof && ptr == mem) return NULL;
 683   return mem;
 684 }
 685
 686 struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
 687                                  int max_size, int padding_bytes)
 688 {
 689     if (max_size > 1000000000)
 690         abort();
 691
 692     int bufsize;
 693     int total_read = 0;
 694     int padding = FFMAX(padding_bytes, 1);
 695     char *buf = NULL;
 696     if (s->end_pos > max_size)
 697         return (struct bstr){NULL, 0};
 698     if (s->end_pos > 0)
 699         bufsize = s->end_pos + padding;
 700     else
 701         bufsize = 1000;
 702     while (1) {
 703         buf = talloc_realloc_size(talloc_ctx, buf, bufsize);
 704         int readsize = stream_read(s, buf + total_read, bufsize - total_read);
 705         total_read += readsize;
 706         if (total_read < bufsize)
 707             break;
 708         if (bufsize > max_size) {
 709             talloc_free(buf);
 710             return (struct bstr){NULL, 0};
 711         }
 712         bufsize = FFMIN(bufsize + (bufsize >> 1), max_size + padding);
 713     }
 714     buf = talloc_realloc_size(talloc_ctx, buf, total_read + padding);
 715     return (struct bstr){buf, total_read};
 716 }