ffmpeg/libavformat/aviobuf.c

   1 /*
   2  * buffered I/O
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/bprint.h"
  23 #include "libavutil/crc.h"
  24 #include "libavutil/dict.h"
  25 #include "libavutil/intreadwrite.h"
  26 #include "libavutil/log.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/avassert.h"
  29 #include "avformat.h"
  30 #include "avio.h"
  31 #include "avio_internal.h"
  32 #include "internal.h"
  33 #include "url.h"
  34 #include <stdarg.h>
  35
  36 #define IO_BUFFER_SIZE 32768
  37
  38 /**
  39  * Do seeks within this distance ahead of the current buffer by skipping
  40  * data instead of calling the protocol seek function, for seekable
  41  * protocols.
  42  */
  43 #define SHORT_SEEK_THRESHOLD 4096
  44
  45 static void *ffio_url_child_next(void *obj, void *prev)
  46 {
  47     AVIOContext *s = obj;
  48     return prev ? NULL : s->opaque;
  49 }
  50
  51 static const AVClass *ffio_url_child_class_next(const AVClass *prev)
  52 {
  53     return prev ? NULL : &ffurl_context_class;
  54 }
  55
  56 static const AVOption ffio_url_options[] = {
  57     { NULL },
  58 };
  59
  60 const AVClass ffio_url_class = {
  61     .class_name = "AVIOContext",
  62     .item_name  = av_default_item_name,
  63     .version    = LIBAVUTIL_VERSION_INT,
  64     .option     = ffio_url_options,
  65     .child_next = ffio_url_child_next,
  66     .child_class_next = ffio_url_child_class_next,
  67 };
  68
  69 static void fill_buffer(AVIOContext *s);
  70 static int url_resetbuf(AVIOContext *s, int flags);
  71
  72 int ffio_init_context(AVIOContext *s,
  73                   unsigned char *buffer,
  74                   int buffer_size,
  75                   int write_flag,
  76                   void *opaque,
  77                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
  78                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
  79                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
  80 {
  81     s->buffer      = buffer;
  82     s->orig_buffer_size =
  83     s->buffer_size = buffer_size;
  84     s->buf_ptr     = buffer;
  85     s->opaque      = opaque;
  86     s->direct      = 0;
  87
  88     url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
  89
  90     s->write_packet    = write_packet;
  91     s->read_packet     = read_packet;
  92     s->seek            = seek;
  93     s->pos             = 0;
  94     s->must_flush      = 0;
  95     s->eof_reached     = 0;
  96     s->error           = 0;
  97     s->seekable        = seek ? AVIO_SEEKABLE_NORMAL : 0;
  98     s->max_packet_size = 0;
  99     s->update_checksum = NULL;
 100
 101     if (!read_packet && !write_flag) {
 102         s->pos     = buffer_size;
 103         s->buf_end = s->buffer + buffer_size;
 104     }
 105     s->read_pause = NULL;
 106     s->read_seek  = NULL;
 107
 108     return 0;
 109 }
 110
 111 AVIOContext *avio_alloc_context(
 112                   unsigned char *buffer,
 113                   int buffer_size,
 114                   int write_flag,
 115                   void *opaque,
 116                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
 117                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
 118                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
 119 {
 120     AVIOContext *s = av_mallocz(sizeof(AVIOContext));
 121     if (!s)
 122         return NULL;
 123     ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
 124                   read_packet, write_packet, seek);
 125     return s;
 126 }
 127
 128 static void writeout(AVIOContext *s, const uint8_t *data, int len)
 129 {
 130     if (s->write_packet && !s->error) {
 131         int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
 132         if (ret < 0) {
 133             s->error = ret;
 134         }
 135     }
 136     s->writeout_count ++;
 137     s->pos += len;
 138 }
 139
 140 static void flush_buffer(AVIOContext *s)
 141 {
 142     if (s->write_flag && s->buf_ptr > s->buffer) {
 143         writeout(s, s->buffer, s->buf_ptr - s->buffer);
 144         if (s->update_checksum) {
 145             s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,
 146                                                  s->buf_ptr - s->checksum_ptr);
 147             s->checksum_ptr = s->buffer;
 148         }
 149     }
 150     s->buf_ptr = s->buffer;
 151     if (!s->write_flag)
 152         s->buf_end = s->buffer;
 153 }
 154
 155 void avio_w8(AVIOContext *s, int b)
 156 {
 157     av_assert2(b>=-128 && b<=255);
 158     *s->buf_ptr++ = b;
 159     if (s->buf_ptr >= s->buf_end)
 160         flush_buffer(s);
 161 }
 162
 163 void ffio_fill(AVIOContext *s, int b, int count)
 164 {
 165     while (count > 0) {
 166         int len = FFMIN(s->buf_end - s->buf_ptr, count);
 167         memset(s->buf_ptr, b, len);
 168         s->buf_ptr += len;
 169
 170         if (s->buf_ptr >= s->buf_end)
 171             flush_buffer(s);
 172
 173         count -= len;
 174     }
 175 }
 176
 177 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
 178 {
 179     if (s->direct && !s->update_checksum) {
 180         avio_flush(s);
 181         writeout(s, buf, size);
 182         return;
 183     }
 184     while (size > 0) {
 185         int len = FFMIN(s->buf_end - s->buf_ptr, size);
 186         memcpy(s->buf_ptr, buf, len);
 187         s->buf_ptr += len;
 188
 189         if (s->buf_ptr >= s->buf_end)
 190             flush_buffer(s);
 191
 192         buf += len;
 193         size -= len;
 194     }
 195 }
 196
 197 void avio_flush(AVIOContext *s)
 198 {
 199     flush_buffer(s);
 200     s->must_flush = 0;
 201 }
 202
 203 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
 204 {
 205     int64_t offset1;
 206     int64_t pos;
 207     int force = whence & AVSEEK_FORCE;
 208     int buffer_size;
 209     whence &= ~AVSEEK_FORCE;
 210
 211     if(!s)
 212         return AVERROR(EINVAL);
 213
 214     buffer_size = s->buf_end - s->buffer;
 215     pos = s->pos - (s->write_flag ? 0 : buffer_size);
 216
 217     if (whence != SEEK_CUR && whence != SEEK_SET)
 218         return AVERROR(EINVAL);
 219
 220     if (whence == SEEK_CUR) {
 221         offset1 = pos + (s->buf_ptr - s->buffer);
 222         if (offset == 0)
 223             return offset1;
 224         offset += offset1;
 225     }
 226     if (offset < 0)
 227         return AVERROR(EINVAL);
 228
 229     offset1 = offset - pos;
 230     if (!s->must_flush && (!s->direct || !s->seek) &&
 231         offset1 >= 0 && offset1 <= buffer_size) {
 232         /* can do the seek inside the buffer */
 233         s->buf_ptr = s->buffer + offset1;
 234     } else if ((!s->seekable ||
 235                offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
 236                !s->write_flag && offset1 >= 0 &&
 237                (!s->direct || !s->seek) &&
 238               (whence != SEEK_END || force)) {
 239         while(s->pos < offset && !s->eof_reached)
 240             fill_buffer(s);
 241         if (s->eof_reached)
 242             return AVERROR_EOF;
 243         s->buf_ptr = s->buf_end + offset - s->pos;
 244     } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
 245         int64_t res;
 246
 247         pos -= FFMIN(buffer_size>>1, pos);
 248         if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
 249             return res;
 250         s->buf_end =
 251         s->buf_ptr = s->buffer;
 252         s->pos = pos;
 253         s->eof_reached = 0;
 254         fill_buffer(s);
 255         return avio_seek(s, offset, SEEK_SET | force);
 256     } else {
 257         int64_t res;
 258         if (s->write_flag) {
 259             flush_buffer(s);
 260             s->must_flush = 1;
 261         }
 262         if (!s->seek)
 263             return AVERROR(EPIPE);
 264         if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
 265             return res;
 266         s->seek_count ++;
 267         if (!s->write_flag)
 268             s->buf_end = s->buffer;
 269         s->buf_ptr = s->buffer;
 270         s->pos = offset;
 271     }
 272     s->eof_reached = 0;
 273     return offset;
 274 }
 275
 276 int64_t avio_skip(AVIOContext *s, int64_t offset)
 277 {
 278     return avio_seek(s, offset, SEEK_CUR);
 279 }
 280
 281 int64_t avio_size(AVIOContext *s)
 282 {
 283     int64_t size;
 284
 285     if (!s)
 286         return AVERROR(EINVAL);
 287
 288     if (!s->seek)
 289         return AVERROR(ENOSYS);
 290     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
 291     if (size < 0) {
 292         if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
 293             return size;
 294         size++;
 295         s->seek(s->opaque, s->pos, SEEK_SET);
 296     }
 297     return size;
 298 }
 299
 300 int avio_feof(AVIOContext *s)
 301 {
 302     if(!s)
 303         return 0;
 304     if(s->eof_reached){
 305         s->eof_reached=0;
 306         fill_buffer(s);
 307     }
 308     return s->eof_reached;
 309 }
 310
 311 #if FF_API_URL_FEOF
 312 int url_feof(AVIOContext *s)
 313 {
 314     return avio_feof(s);
 315 }
 316 #endif
 317
 318 void avio_wl32(AVIOContext *s, unsigned int val)
 319 {
 320     avio_w8(s, (uint8_t) val       );
 321     avio_w8(s, (uint8_t)(val >> 8 ));
 322     avio_w8(s, (uint8_t)(val >> 16));
 323     avio_w8(s,           val >> 24 );
 324 }
 325
 326 void avio_wb32(AVIOContext *s, unsigned int val)
 327 {
 328     avio_w8(s,           val >> 24 );
 329     avio_w8(s, (uint8_t)(val >> 16));
 330     avio_w8(s, (uint8_t)(val >> 8 ));
 331     avio_w8(s, (uint8_t) val       );
 332 }
 333
 334 int avio_put_str(AVIOContext *s, const char *str)
 335 {
 336     int len = 1;
 337     if (str) {
 338         len += strlen(str);
 339         avio_write(s, (const unsigned char *) str, len);
 340     } else
 341         avio_w8(s, 0);
 342     return len;
 343 }
 344
 345 int avio_put_str16le(AVIOContext *s, const char *str)
 346 {
 347     const uint8_t *q = str;
 348     int ret = 0;
 349     int err = 0;
 350
 351     while (*q) {
 352         uint32_t ch;
 353         uint16_t tmp;
 354
 355         GET_UTF8(ch, *q++, goto invalid;)
 356         PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;)
 357         continue;
 358 invalid:
 359         av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16le\n");
 360         err = AVERROR(EINVAL);
 361     }
 362     avio_wl16(s, 0);
 363     if (err)
 364         return err;
 365     ret += 2;
 366     return ret;
 367 }
 368
 369 int ff_get_v_length(uint64_t val)
 370 {
 371     int i = 1;
 372
 373     while (val >>= 7)
 374         i++;
 375
 376     return i;
 377 }
 378
 379 void ff_put_v(AVIOContext *bc, uint64_t val)
 380 {
 381     int i = ff_get_v_length(val);
 382
 383     while (--i > 0)
 384         avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
 385
 386     avio_w8(bc, val & 127);
 387 }
 388
 389 void avio_wl64(AVIOContext *s, uint64_t val)
 390 {
 391     avio_wl32(s, (uint32_t)(val & 0xffffffff));
 392     avio_wl32(s, (uint32_t)(val >> 32));
 393 }
 394
 395 void avio_wb64(AVIOContext *s, uint64_t val)
 396 {
 397     avio_wb32(s, (uint32_t)(val >> 32));
 398     avio_wb32(s, (uint32_t)(val & 0xffffffff));
 399 }
 400
 401 void avio_wl16(AVIOContext *s, unsigned int val)
 402 {
 403     avio_w8(s, (uint8_t)val);
 404     avio_w8(s, (int)val >> 8);
 405 }
 406
 407 void avio_wb16(AVIOContext *s, unsigned int val)
 408 {
 409     avio_w8(s, (int)val >> 8);
 410     avio_w8(s, (uint8_t)val);
 411 }
 412
 413 void avio_wl24(AVIOContext *s, unsigned int val)
 414 {
 415     avio_wl16(s, val & 0xffff);
 416     avio_w8(s, (int)val >> 16);
 417 }
 418
 419 void avio_wb24(AVIOContext *s, unsigned int val)
 420 {
 421     avio_wb16(s, (int)val >> 8);
 422     avio_w8(s, (uint8_t)val);
 423 }
 424
 425 /* Input stream */
 426
 427 static void fill_buffer(AVIOContext *s)
 428 {
 429     int max_buffer_size = s->max_packet_size ?
 430                           s->max_packet_size : IO_BUFFER_SIZE;
 431     uint8_t *dst        = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
 432                           s->buf_end : s->buffer;
 433     int len             = s->buffer_size - (dst - s->buffer);
 434
 435     /* can't fill the buffer without read_packet, just set EOF if appropriate */
 436     if (!s->read_packet && s->buf_ptr >= s->buf_end)
 437         s->eof_reached = 1;
 438
 439     /* no need to do anything if EOF already reached */
 440     if (s->eof_reached)
 441         return;
 442
 443     if (s->update_checksum && dst == s->buffer) {
 444         if (s->buf_end > s->checksum_ptr)
 445             s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
 446                                              s->buf_end - s->checksum_ptr);
 447         s->checksum_ptr = s->buffer;
 448     }
 449
 450     /* make buffer smaller in case it ended up large after probing */
 451     if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
 452         if (dst == s->buffer) {
 453             ffio_set_buf_size(s, s->orig_buffer_size);
 454
 455             s->checksum_ptr = dst = s->buffer;
 456         }
 457         av_assert0(len >= s->orig_buffer_size);
 458         len = s->orig_buffer_size;
 459     }
 460
 461     if (s->read_packet)
 462         len = s->read_packet(s->opaque, dst, len);
 463     else
 464         len = 0;
 465     if (len <= 0) {
 466         /* do not modify buffer if EOF reached so that a seek back can
 467            be done without rereading data */
 468         s->eof_reached = 1;
 469         if (len < 0)
 470             s->error = len;
 471     } else {
 472         s->pos += len;
 473         s->buf_ptr = dst;
 474         s->buf_end = dst + len;
 475         s->bytes_read += len;
 476     }
 477 }
 478
 479 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
 480                                     unsigned int len)
 481 {
 482     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
 483 }
 484
 485 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
 486                                 unsigned int len)
 487 {
 488     return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
 489 }
 490
 491 unsigned long ffio_get_checksum(AVIOContext *s)
 492 {
 493     s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
 494                                      s->buf_ptr - s->checksum_ptr);
 495     s->update_checksum = NULL;
 496     return s->checksum;
 497 }
 498
 499 void ffio_init_checksum(AVIOContext *s,
 500                    unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
 501                    unsigned long checksum)
 502 {
 503     s->update_checksum = update_checksum;
 504     if (s->update_checksum) {
 505         s->checksum     = checksum;
 506         s->checksum_ptr = s->buf_ptr;
 507     }
 508 }
 509
 510 /* XXX: put an inline version */
 511 int avio_r8(AVIOContext *s)
 512 {
 513     if (s->buf_ptr >= s->buf_end)
 514         fill_buffer(s);
 515     if (s->buf_ptr < s->buf_end)
 516         return *s->buf_ptr++;
 517     return 0;
 518 }
 519
 520 int avio_read(AVIOContext *s, unsigned char *buf, int size)
 521 {
 522     int len, size1;
 523
 524     size1 = size;
 525     while (size > 0) {
 526         len = s->buf_end - s->buf_ptr;
 527         if (len > size)
 528             len = size;
 529         if (len == 0 || s->write_flag) {
 530             if((s->direct || size > s->buffer_size) && !s->update_checksum){
 531                 if(s->read_packet)
 532                     len = s->read_packet(s->opaque, buf, size);
 533                 if (len <= 0) {
 534                     /* do not modify buffer if EOF reached so that a seek back can
 535                     be done without rereading data */
 536                     s->eof_reached = 1;
 537                     if(len<0)
 538                         s->error= len;
 539                     break;
 540                 } else {
 541                     s->pos += len;
 542                     s->bytes_read += len;
 543                     size -= len;
 544                     buf += len;
 545                     s->buf_ptr = s->buffer;
 546                     s->buf_end = s->buffer/* + len*/;
 547                 }
 548             } else {
 549                 fill_buffer(s);
 550                 len = s->buf_end - s->buf_ptr;
 551                 if (len == 0)
 552                     break;
 553             }
 554         } else {
 555             memcpy(buf, s->buf_ptr, len);
 556             buf += len;
 557             s->buf_ptr += len;
 558             size -= len;
 559         }
 560     }
 561     if (size1 == size) {
 562         if (s->error)      return s->error;
 563         if (avio_feof(s))  return AVERROR_EOF;
 564     }
 565     return size1 - size;
 566 }
 567
 568 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
 569 {
 570     if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
 571         *data = s->buf_ptr;
 572         s->buf_ptr += size;
 573         return size;
 574     } else {
 575         *data = buf;
 576         return avio_read(s, buf, size);
 577     }
 578 }
 579
 580 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
 581 {
 582     int len;
 583
 584     if (size < 0)
 585         return -1;
 586
 587     if (s->read_packet && s->write_flag) {
 588         len = s->read_packet(s->opaque, buf, size);
 589         if (len > 0)
 590             s->pos += len;
 591         return len;
 592     }
 593
 594     len = s->buf_end - s->buf_ptr;
 595     if (len == 0) {
 596         /* Reset the buf_end pointer to the start of the buffer, to make sure
 597          * the fill_buffer call tries to read as much data as fits into the
 598          * full buffer, instead of just what space is left after buf_end.
 599          * This avoids returning partial packets at the end of the buffer,
 600          * for packet based inputs.
 601          */
 602         s->buf_end = s->buf_ptr = s->buffer;
 603         fill_buffer(s);
 604         len = s->buf_end - s->buf_ptr;
 605     }
 606     if (len > size)
 607         len = size;
 608     memcpy(buf, s->buf_ptr, len);
 609     s->buf_ptr += len;
 610     if (!len) {
 611         if (s->error)      return s->error;
 612         if (avio_feof(s))  return AVERROR_EOF;
 613     }
 614     return len;
 615 }
 616
 617 unsigned int avio_rl16(AVIOContext *s)
 618 {
 619     unsigned int val;
 620     val = avio_r8(s);
 621     val |= avio_r8(s) << 8;
 622     return val;
 623 }
 624
 625 unsigned int avio_rl24(AVIOContext *s)
 626 {
 627     unsigned int val;
 628     val = avio_rl16(s);
 629     val |= avio_r8(s) << 16;
 630     return val;
 631 }
 632
 633 unsigned int avio_rl32(AVIOContext *s)
 634 {
 635     unsigned int val;
 636     val = avio_rl16(s);
 637     val |= avio_rl16(s) << 16;
 638     return val;
 639 }
 640
 641 uint64_t avio_rl64(AVIOContext *s)
 642 {
 643     uint64_t val;
 644     val = (uint64_t)avio_rl32(s);
 645     val |= (uint64_t)avio_rl32(s) << 32;
 646     return val;
 647 }
 648
 649 unsigned int avio_rb16(AVIOContext *s)
 650 {
 651     unsigned int val;
 652     val = avio_r8(s) << 8;
 653     val |= avio_r8(s);
 654     return val;
 655 }
 656
 657 unsigned int avio_rb24(AVIOContext *s)
 658 {
 659     unsigned int val;
 660     val = avio_rb16(s) << 8;
 661     val |= avio_r8(s);
 662     return val;
 663 }
 664 unsigned int avio_rb32(AVIOContext *s)
 665 {
 666     unsigned int val;
 667     val = avio_rb16(s) << 16;
 668     val |= avio_rb16(s);
 669     return val;
 670 }
 671
 672 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
 673 {
 674     int i = 0;
 675     char c;
 676
 677     do {
 678         c = avio_r8(s);
 679         if (c && i < maxlen-1)
 680             buf[i++] = c;
 681     } while (c != '\n' && c != '\r' && c);
 682     if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
 683         avio_skip(s, -1);
 684
 685     buf[i] = 0;
 686     return i;
 687 }
 688
 689 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
 690 {
 691     int i;
 692
 693     if (buflen <= 0)
 694         return AVERROR(EINVAL);
 695     // reserve 1 byte for terminating 0
 696     buflen = FFMIN(buflen - 1, maxlen);
 697     for (i = 0; i < buflen; i++)
 698         if (!(buf[i] = avio_r8(s)))
 699             return i + 1;
 700     buf[i] = 0;
 701     for (; i < maxlen; i++)
 702         if (!avio_r8(s))
 703             return i + 1;
 704     return maxlen;
 705 }
 706
 707 #define GET_STR16(type, read) \
 708     int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
 709 {\
 710     char* q = buf;\
 711     int ret = 0;\
 712     if (buflen <= 0) \
 713         return AVERROR(EINVAL); \
 714     while (ret + 1 < maxlen) {\
 715         uint8_t tmp;\
 716         uint32_t ch;\
 717         GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
 718         if (!ch)\
 719             break;\
 720         PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
 721     }\
 722     *q = 0;\
 723     return ret;\
 724 }\
 725
 726 GET_STR16(le, avio_rl16)
 727 GET_STR16(be, avio_rb16)
 728
 729 #undef GET_STR16
 730
 731 uint64_t avio_rb64(AVIOContext *s)
 732 {
 733     uint64_t val;
 734     val = (uint64_t)avio_rb32(s) << 32;
 735     val |= (uint64_t)avio_rb32(s);
 736     return val;
 737 }
 738
 739 uint64_t ffio_read_varlen(AVIOContext *bc){
 740     uint64_t val = 0;
 741     int tmp;
 742
 743     do{
 744         tmp = avio_r8(bc);
 745         val= (val<<7) + (tmp&127);
 746     }while(tmp&128);
 747     return val;
 748 }
 749
 750 int ffio_fdopen(AVIOContext **s, URLContext *h)
 751 {
 752     uint8_t *buffer;
 753     int buffer_size, max_packet_size;
 754
 755     max_packet_size = h->max_packet_size;
 756     if (max_packet_size) {
 757         buffer_size = max_packet_size; /* no need to bufferize more than one packet */
 758     } else {
 759         buffer_size = IO_BUFFER_SIZE;
 760     }
 761     buffer = av_malloc(buffer_size);
 762     if (!buffer)
 763         return AVERROR(ENOMEM);
 764
 765     *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
 766                             (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek);
 767     if (!*s) {
 768         av_free(buffer);
 769         return AVERROR(ENOMEM);
 770     }
 771     (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
 772     (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
 773     (*s)->max_packet_size = max_packet_size;
 774     if(h->prot) {
 775         (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
 776         (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
 777     }
 778     (*s)->av_class = &ffio_url_class;
 779     return 0;
 780 }
 781
 782 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
 783 {
 784     uint8_t *buffer;
 785     int max_buffer_size = s->max_packet_size ?
 786                           s->max_packet_size : IO_BUFFER_SIZE;
 787     int filled = s->buf_end - s->buffer;
 788
 789     buf_size += s->buf_ptr - s->buffer + max_buffer_size;
 790
 791     if (buf_size < filled || s->seekable)
 792         return 0;
 793     av_assert0(!s->write_flag);
 794
 795     buffer = av_malloc(buf_size);
 796     if (!buffer)
 797         return AVERROR(ENOMEM);
 798
 799     memcpy(buffer, s->buffer, filled);
 800     av_free(s->buffer);
 801     s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
 802     s->buf_end = buffer + (s->buf_end - s->buffer);
 803     s->buffer = buffer;
 804     s->buffer_size = buf_size;
 805     return 0;
 806 }
 807
 808 int ffio_set_buf_size(AVIOContext *s, int buf_size)
 809 {
 810     uint8_t *buffer;
 811     buffer = av_malloc(buf_size);
 812     if (!buffer)
 813         return AVERROR(ENOMEM);
 814
 815     av_free(s->buffer);
 816     s->buffer = buffer;
 817     s->orig_buffer_size =
 818     s->buffer_size = buf_size;
 819     s->buf_ptr = buffer;
 820     url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
 821     return 0;
 822 }
 823
 824 static int url_resetbuf(AVIOContext *s, int flags)
 825 {
 826     av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
 827
 828     if (flags & AVIO_FLAG_WRITE) {
 829         s->buf_end = s->buffer + s->buffer_size;
 830         s->write_flag = 1;
 831     } else {
 832         s->buf_end = s->buffer;
 833         s->write_flag = 0;
 834     }
 835     return 0;
 836 }
 837
 838 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
 839 {
 840     int64_t buffer_start;
 841     int buffer_size;
 842     int overlap, new_size, alloc_size;
 843     uint8_t *buf = *bufp;
 844
 845     if (s->write_flag) {
 846         av_freep(bufp);
 847         return AVERROR(EINVAL);
 848     }
 849
 850     buffer_size = s->buf_end - s->buffer;
 851
 852     /* the buffers must touch or overlap */
 853     if ((buffer_start = s->pos - buffer_size) > buf_size) {
 854         av_freep(bufp);
 855         return AVERROR(EINVAL);
 856     }
 857
 858     overlap = buf_size - buffer_start;
 859     new_size = buf_size + buffer_size - overlap;
 860
 861     alloc_size = FFMAX(s->buffer_size, new_size);
 862     if (alloc_size > buf_size)
 863         if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
 864             return AVERROR(ENOMEM);
 865
 866     if (new_size > buf_size) {
 867         memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
 868         buf_size = new_size;
 869     }
 870
 871     av_free(s->buffer);
 872     s->buf_ptr = s->buffer = buf;
 873     s->buffer_size = alloc_size;
 874     s->pos = buf_size;
 875     s->buf_end = s->buf_ptr + buf_size;
 876     s->eof_reached = 0;
 877     s->must_flush = 0;
 878
 879     return 0;
 880 }
 881
 882 int avio_open(AVIOContext **s, const char *filename, int flags)
 883 {
 884     return avio_open2(s, filename, flags, NULL, NULL);
 885 }
 886
 887 int avio_open2(AVIOContext **s, const char *filename, int flags,
 888                const AVIOInterruptCB *int_cb, AVDictionary **options)
 889 {
 890     URLContext *h;
 891     int err;
 892
 893     err = ffurl_open(&h, filename, flags, int_cb, options);
 894     if (err < 0)
 895         return err;
 896     err = ffio_fdopen(s, h);
 897     if (err < 0) {
 898         ffurl_close(h);
 899         return err;
 900     }
 901     return 0;
 902 }
 903
 904 int avio_close(AVIOContext *s)
 905 {
 906     URLContext *h;
 907
 908     if (!s)
 909         return 0;
 910
 911     avio_flush(s);
 912     h = s->opaque;
 913     av_freep(&s->buffer);
 914     if (s->write_flag)
 915         av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
 916     else
 917         av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
 918     av_free(s);
 919     return ffurl_close(h);
 920 }
 921
 922 int avio_closep(AVIOContext **s)
 923 {
 924     int ret = avio_close(*s);
 925     *s = NULL;
 926     return ret;
 927 }
 928
 929 int avio_printf(AVIOContext *s, const char *fmt, ...)
 930 {
 931     va_list ap;
 932     char buf[4096];
 933     int ret;
 934
 935     va_start(ap, fmt);
 936     ret = vsnprintf(buf, sizeof(buf), fmt, ap);
 937     va_end(ap);
 938     avio_write(s, buf, strlen(buf));
 939     return ret;
 940 }
 941
 942 int avio_pause(AVIOContext *s, int pause)
 943 {
 944     if (!s->read_pause)
 945         return AVERROR(ENOSYS);
 946     return s->read_pause(s->opaque, pause);
 947 }
 948
 949 int64_t avio_seek_time(AVIOContext *s, int stream_index,
 950                        int64_t timestamp, int flags)
 951 {
 952     URLContext *h = s->opaque;
 953     int64_t ret;
 954     if (!s->read_seek)
 955         return AVERROR(ENOSYS);
 956     ret = s->read_seek(h, stream_index, timestamp, flags);
 957     if (ret >= 0) {
 958         int64_t pos;
 959         s->buf_ptr = s->buf_end; // Flush buffer
 960         pos = s->seek(h, 0, SEEK_CUR);
 961         if (pos >= 0)
 962             s->pos = pos;
 963         else if (pos != AVERROR(ENOSYS))
 964             ret = pos;
 965     }
 966     return ret;
 967 }
 968
 969 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
 970 {
 971     int ret;
 972     char buf[1024];
 973     while (max_size) {
 974         ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
 975         if (ret == AVERROR_EOF)
 976             return 0;
 977         if (ret <= 0)
 978             return ret;
 979         av_bprint_append_data(pb, buf, ret);
 980         if (!av_bprint_is_complete(pb))
 981             return AVERROR(ENOMEM);
 982         max_size -= ret;
 983     }
 984     return 0;
 985 }
 986
 987 /* output in a dynamic buffer */
 988
 989 typedef struct DynBuffer {
 990     int pos, size, allocated_size;
 991     uint8_t *buffer;
 992     int io_buffer_size;
 993     uint8_t io_buffer[1];
 994 } DynBuffer;
 995
 996 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
 997 {
 998     DynBuffer *d = opaque;
 999     unsigned new_size, new_allocated_size;
1000
1001     /* reallocate buffer if needed */
1002     new_size = d->pos + buf_size;
1003     new_allocated_size = d->allocated_size;
1004     if (new_size < d->pos || new_size > INT_MAX/2)
1005         return -1;
1006     while (new_size > new_allocated_size) {
1007         if (!new_allocated_size)
1008             new_allocated_size = new_size;
1009         else
1010             new_allocated_size += new_allocated_size / 2 + 1;
1011     }
1012
1013     if (new_allocated_size > d->allocated_size) {
1014         int err;
1015         if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1016             d->allocated_size = 0;
1017             d->size = 0;
1018             return err;
1019         }
1020         d->allocated_size = new_allocated_size;
1021     }
1022     memcpy(d->buffer + d->pos, buf, buf_size);
1023     d->pos = new_size;
1024     if (d->pos > d->size)
1025         d->size = d->pos;
1026     return buf_size;
1027 }
1028
1029 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1030 {
1031     unsigned char buf1[4];
1032     int ret;
1033
1034     /* packetized write: output the header */
1035     AV_WB32(buf1, buf_size);
1036     ret = dyn_buf_write(opaque, buf1, 4);
1037     if (ret < 0)
1038         return ret;
1039
1040     /* then the data */
1041     return dyn_buf_write(opaque, buf, buf_size);
1042 }
1043
1044 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1045 {
1046     DynBuffer *d = opaque;
1047
1048     if (whence == SEEK_CUR)
1049         offset += d->pos;
1050     else if (whence == SEEK_END)
1051         offset += d->size;
1052     if (offset < 0 || offset > 0x7fffffffLL)
1053         return -1;
1054     d->pos = offset;
1055     return 0;
1056 }
1057
1058 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1059 {
1060     DynBuffer *d;
1061     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1062
1063     if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1064         return -1;
1065     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1066     if (!d)
1067         return AVERROR(ENOMEM);
1068     d->io_buffer_size = io_buffer_size;
1069     *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1070                             max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1071                             max_packet_size ? NULL : dyn_buf_seek);
1072     if(!*s) {
1073         av_free(d);
1074         return AVERROR(ENOMEM);
1075     }
1076     (*s)->max_packet_size = max_packet_size;
1077     return 0;
1078 }
1079
1080 int avio_open_dyn_buf(AVIOContext **s)
1081 {
1082     return url_open_dyn_buf_internal(s, 0);
1083 }
1084
1085 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1086 {
1087     if (max_packet_size <= 0)
1088         return -1;
1089     return url_open_dyn_buf_internal(s, max_packet_size);
1090 }
1091
1092 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1093 {
1094     DynBuffer *d;
1095     int size;
1096     static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1097     int padding = 0;
1098
1099     if (!s) {
1100         *pbuffer = NULL;
1101         return 0;
1102     }
1103
1104     /* don't attempt to pad fixed-size packet buffers */
1105     if (!s->max_packet_size) {
1106         avio_write(s, padbuf, sizeof(padbuf));
1107         padding = FF_INPUT_BUFFER_PADDING_SIZE;
1108     }
1109
1110     avio_flush(s);
1111
1112     d = s->opaque;
1113     *pbuffer = d->buffer;
1114     size = d->size;
1115     av_free(d);
1116     av_free(s);
1117     return size - padding;
1118 }
1119
1120 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1121 {
1122     DynBuffer *d = opaque;
1123
1124     d->pos += buf_size;
1125     if (d->pos > d->size)
1126         d->size = d->pos;
1127     return buf_size;
1128 }
1129
1130 int ffio_open_null_buf(AVIOContext **s)
1131 {
1132     int ret = url_open_dyn_buf_internal(s, 0);
1133     if (ret >= 0) {
1134         AVIOContext *pb = *s;
1135         pb->write_packet = null_buf_write;
1136     }
1137     return ret;
1138 }
1139
1140 int ffio_close_null_buf(AVIOContext *s)
1141 {
1142     DynBuffer *d = s->opaque;
1143     int size;
1144
1145     avio_flush(s);
1146
1147     size = d->size;
1148     av_free(d);
1149     av_free(s);
1150     return size;
1151 }