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  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 *ff_avio_child_next(void *obj, void *prev)
  46. {
  47.     AVIOContext *s = obj;
  48.     return prev ? NULL : s->opaque;
  49. }
  50.  
  51. static const AVClass *ff_avio_child_class_next(const AVClass *prev)
  52. {
  53.     return prev ? NULL : &ffurl_context_class;
  54. }
  55.  
  56. static const AVOption ff_avio_options[] = {
  57.     { NULL },
  58. };
  59.  
  60. const AVClass ff_avio_class = {
  61.     .class_name = "AVIOContext",
  62.     .item_name  = av_default_item_name,
  63.     .version    = LIBAVUTIL_VERSION_INT,
  64.     .option     = ff_avio_options,
  65.     .child_next = ff_avio_child_next,
  66.     .child_class_next = ff_avio_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.     s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
  101.  
  102.     if (!read_packet && !write_flag) {
  103.         s->pos     = buffer_size;
  104.         s->buf_end = s->buffer + buffer_size;
  105.     }
  106.     s->read_pause = NULL;
  107.     s->read_seek  = NULL;
  108.  
  109.     return 0;
  110. }
  111.  
  112. AVIOContext *avio_alloc_context(
  113.                   unsigned char *buffer,
  114.                   int buffer_size,
  115.                   int write_flag,
  116.                   void *opaque,
  117.                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
  118.                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
  119.                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
  120. {
  121.     AVIOContext *s = av_mallocz(sizeof(AVIOContext));
  122.     if (!s)
  123.         return NULL;
  124.     ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
  125.                   read_packet, write_packet, seek);
  126.     return s;
  127. }
  128.  
  129. static void writeout(AVIOContext *s, const uint8_t *data, int len)
  130. {
  131.     if (s->write_packet && !s->error) {
  132.         int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
  133.         if (ret < 0) {
  134.             s->error = ret;
  135.         }
  136.     }
  137.     s->writeout_count ++;
  138.     s->pos += len;
  139. }
  140.  
  141. static void flush_buffer(AVIOContext *s)
  142. {
  143.     if (s->write_flag && s->buf_ptr > s->buffer) {
  144.         writeout(s, s->buffer, s->buf_ptr - s->buffer);
  145.         if (s->update_checksum) {
  146.             s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,
  147.                                                  s->buf_ptr - s->checksum_ptr);
  148.             s->checksum_ptr = s->buffer;
  149.         }
  150.     }
  151.     s->buf_ptr = s->buffer;
  152.     if (!s->write_flag)
  153.         s->buf_end = s->buffer;
  154. }
  155.  
  156. void avio_w8(AVIOContext *s, int b)
  157. {
  158.     av_assert2(b>=-128 && b<=255);
  159.     *s->buf_ptr++ = b;
  160.     if (s->buf_ptr >= s->buf_end)
  161.         flush_buffer(s);
  162. }
  163.  
  164. void ffio_fill(AVIOContext *s, int b, int count)
  165. {
  166.     while (count > 0) {
  167.         int len = FFMIN(s->buf_end - s->buf_ptr, count);
  168.         memset(s->buf_ptr, b, len);
  169.         s->buf_ptr += len;
  170.  
  171.         if (s->buf_ptr >= s->buf_end)
  172.             flush_buffer(s);
  173.  
  174.         count -= len;
  175.     }
  176. }
  177.  
  178. void avio_write(AVIOContext *s, const unsigned char *buf, int size)
  179. {
  180.     if (s->direct && !s->update_checksum) {
  181.         avio_flush(s);
  182.         writeout(s, buf, size);
  183.         return;
  184.     }
  185.     while (size > 0) {
  186.         int len = FFMIN(s->buf_end - s->buf_ptr, size);
  187.         memcpy(s->buf_ptr, buf, len);
  188.         s->buf_ptr += len;
  189.  
  190.         if (s->buf_ptr >= s->buf_end)
  191.             flush_buffer(s);
  192.  
  193.         buf += len;
  194.         size -= len;
  195.     }
  196. }
  197.  
  198. void avio_flush(AVIOContext *s)
  199. {
  200.     flush_buffer(s);
  201.     s->must_flush = 0;
  202. }
  203.  
  204. int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
  205. {
  206.     int64_t offset1;
  207.     int64_t pos;
  208.     int force = whence & AVSEEK_FORCE;
  209.     int buffer_size;
  210.     whence &= ~AVSEEK_FORCE;
  211.  
  212.     if(!s)
  213.         return AVERROR(EINVAL);
  214.  
  215.     buffer_size = s->buf_end - s->buffer;
  216.     pos = s->pos - (s->write_flag ? 0 : buffer_size);
  217.  
  218.     if (whence != SEEK_CUR && whence != SEEK_SET)
  219.         return AVERROR(EINVAL);
  220.  
  221.     if (whence == SEEK_CUR) {
  222.         offset1 = pos + (s->buf_ptr - s->buffer);
  223.         if (offset == 0)
  224.             return offset1;
  225.         offset += offset1;
  226.     }
  227.     if (offset < 0)
  228.         return AVERROR(EINVAL);
  229.  
  230.     offset1 = offset - pos;
  231.     if (!s->must_flush && (!s->direct || !s->seek) &&
  232.         offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
  233.         /* can do the seek inside the buffer */
  234.         s->buf_ptr = s->buffer + offset1;
  235.     } else if ((!s->seekable ||
  236.                offset1 <= s->buf_end + s->short_seek_threshold - s->buffer) &&
  237.                !s->write_flag && offset1 >= 0 &&
  238.                (!s->direct || !s->seek) &&
  239.               (whence != SEEK_END || force)) {
  240.         while(s->pos < offset && !s->eof_reached)
  241.             fill_buffer(s);
  242.         if (s->eof_reached)
  243.             return AVERROR_EOF;
  244.         s->buf_ptr = s->buf_end + offset - s->pos;
  245.     } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
  246.         int64_t res;
  247.  
  248.         pos -= FFMIN(buffer_size>>1, pos);
  249.         if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
  250.             return res;
  251.         s->buf_end =
  252.         s->buf_ptr = s->buffer;
  253.         s->pos = pos;
  254.         s->eof_reached = 0;
  255.         fill_buffer(s);
  256.         return avio_seek(s, offset, SEEK_SET | force);
  257.     } else {
  258.         int64_t res;
  259.         if (s->write_flag) {
  260.             flush_buffer(s);
  261.             s->must_flush = 1;
  262.         }
  263.         if (!s->seek)
  264.             return AVERROR(EPIPE);
  265.         if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
  266.             return res;
  267.         s->seek_count ++;
  268.         if (!s->write_flag)
  269.             s->buf_end = s->buffer;
  270.         s->buf_ptr = s->buffer;
  271.         s->pos = offset;
  272.     }
  273.     s->eof_reached = 0;
  274.     return offset;
  275. }
  276.  
  277. int64_t avio_skip(AVIOContext *s, int64_t offset)
  278. {
  279.     return avio_seek(s, offset, SEEK_CUR);
  280. }
  281.  
  282. int64_t avio_size(AVIOContext *s)
  283. {
  284.     int64_t size;
  285.  
  286.     if (!s)
  287.         return AVERROR(EINVAL);
  288.  
  289.     if (!s->seek)
  290.         return AVERROR(ENOSYS);
  291.     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
  292.     if (size < 0) {
  293.         if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
  294.             return size;
  295.         size++;
  296.         s->seek(s->opaque, s->pos, SEEK_SET);
  297.     }
  298.     return size;
  299. }
  300.  
  301. int avio_feof(AVIOContext *s)
  302. {
  303.     if(!s)
  304.         return 0;
  305.     if(s->eof_reached){
  306.         s->eof_reached=0;
  307.         fill_buffer(s);
  308.     }
  309.     return s->eof_reached;
  310. }
  311.  
  312. #if FF_API_URL_FEOF
  313. int url_feof(AVIOContext *s)
  314. {
  315.     return avio_feof(s);
  316. }
  317. #endif
  318.  
  319. void avio_wl32(AVIOContext *s, unsigned int val)
  320. {
  321.     avio_w8(s, (uint8_t) val       );
  322.     avio_w8(s, (uint8_t)(val >> 8 ));
  323.     avio_w8(s, (uint8_t)(val >> 16));
  324.     avio_w8(s,           val >> 24 );
  325. }
  326.  
  327. void avio_wb32(AVIOContext *s, unsigned int val)
  328. {
  329.     avio_w8(s,           val >> 24 );
  330.     avio_w8(s, (uint8_t)(val >> 16));
  331.     avio_w8(s, (uint8_t)(val >> 8 ));
  332.     avio_w8(s, (uint8_t) val       );
  333. }
  334.  
  335. int avio_put_str(AVIOContext *s, const char *str)
  336. {
  337.     int len = 1;
  338.     if (str) {
  339.         len += strlen(str);
  340.         avio_write(s, (const unsigned char *) str, len);
  341.     } else
  342.         avio_w8(s, 0);
  343.     return len;
  344. }
  345.  
  346. static inline int put_str16(AVIOContext *s, const char *str, const int be)
  347. {
  348.     const uint8_t *q = str;
  349.     int ret = 0;
  350.     int err = 0;
  351.  
  352.     while (*q) {
  353.         uint32_t ch;
  354.         uint16_t tmp;
  355.  
  356.         GET_UTF8(ch, *q++, goto invalid;)
  357.         PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
  358.                   ret += 2;)
  359.         continue;
  360. invalid:
  361.         av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
  362.         err = AVERROR(EINVAL);
  363.         if (!*(q-1))
  364.             break;
  365.     }
  366.     if (be)
  367.         avio_wb16(s, 0);
  368.     else
  369.         avio_wl16(s, 0);
  370.     if (err)
  371.         return err;
  372.     ret += 2;
  373.     return ret;
  374. }
  375.  
  376. #define PUT_STR16(type, big_endian)                          \
  377. int avio_put_str16 ## type(AVIOContext *s, const char *str)  \
  378. {                                                            \
  379. return put_str16(s, str, big_endian);                        \
  380. }
  381.  
  382. PUT_STR16(le, 0)
  383. PUT_STR16(be, 1)
  384.  
  385. #undef PUT_STR16
  386.  
  387. int ff_get_v_length(uint64_t val)
  388. {
  389.     int i = 1;
  390.  
  391.     while (val >>= 7)
  392.         i++;
  393.  
  394.     return i;
  395. }
  396.  
  397. void ff_put_v(AVIOContext *bc, uint64_t val)
  398. {
  399.     int i = ff_get_v_length(val);
  400.  
  401.     while (--i > 0)
  402.         avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
  403.  
  404.     avio_w8(bc, val & 127);
  405. }
  406.  
  407. void avio_wl64(AVIOContext *s, uint64_t val)
  408. {
  409.     avio_wl32(s, (uint32_t)(val & 0xffffffff));
  410.     avio_wl32(s, (uint32_t)(val >> 32));
  411. }
  412.  
  413. void avio_wb64(AVIOContext *s, uint64_t val)
  414. {
  415.     avio_wb32(s, (uint32_t)(val >> 32));
  416.     avio_wb32(s, (uint32_t)(val & 0xffffffff));
  417. }
  418.  
  419. void avio_wl16(AVIOContext *s, unsigned int val)
  420. {
  421.     avio_w8(s, (uint8_t)val);
  422.     avio_w8(s, (int)val >> 8);
  423. }
  424.  
  425. void avio_wb16(AVIOContext *s, unsigned int val)
  426. {
  427.     avio_w8(s, (int)val >> 8);
  428.     avio_w8(s, (uint8_t)val);
  429. }
  430.  
  431. void avio_wl24(AVIOContext *s, unsigned int val)
  432. {
  433.     avio_wl16(s, val & 0xffff);
  434.     avio_w8(s, (int)val >> 16);
  435. }
  436.  
  437. void avio_wb24(AVIOContext *s, unsigned int val)
  438. {
  439.     avio_wb16(s, (int)val >> 8);
  440.     avio_w8(s, (uint8_t)val);
  441. }
  442.  
  443. /* Input stream */
  444.  
  445. static void fill_buffer(AVIOContext *s)
  446. {
  447.     int max_buffer_size = s->max_packet_size ?
  448.                           s->max_packet_size : IO_BUFFER_SIZE;
  449.     uint8_t *dst        = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
  450.                           s->buf_end : s->buffer;
  451.     int len             = s->buffer_size - (dst - s->buffer);
  452.  
  453.     /* can't fill the buffer without read_packet, just set EOF if appropriate */
  454.     if (!s->read_packet && s->buf_ptr >= s->buf_end)
  455.         s->eof_reached = 1;
  456.  
  457.     /* no need to do anything if EOF already reached */
  458.     if (s->eof_reached)
  459.         return;
  460.  
  461.     if (s->update_checksum && dst == s->buffer) {
  462.         if (s->buf_end > s->checksum_ptr)
  463.             s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
  464.                                              s->buf_end - s->checksum_ptr);
  465.         s->checksum_ptr = s->buffer;
  466.     }
  467.  
  468.     /* make buffer smaller in case it ended up large after probing */
  469.     if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
  470.         if (dst == s->buffer) {
  471.             int ret = ffio_set_buf_size(s, s->orig_buffer_size);
  472.             if (ret < 0)
  473.                 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
  474.  
  475.             s->checksum_ptr = dst = s->buffer;
  476.         }
  477.         av_assert0(len >= s->orig_buffer_size);
  478.         len = s->orig_buffer_size;
  479.     }
  480.  
  481.     if (s->read_packet)
  482.         len = s->read_packet(s->opaque, dst, len);
  483.     else
  484.         len = 0;
  485.     if (len <= 0) {
  486.         /* do not modify buffer if EOF reached so that a seek back can
  487.            be done without rereading data */
  488.         s->eof_reached = 1;
  489.         if (len < 0)
  490.             s->error = len;
  491.     } else {
  492.         s->pos += len;
  493.         s->buf_ptr = dst;
  494.         s->buf_end = dst + len;
  495.         s->bytes_read += len;
  496.     }
  497. }
  498.  
  499. unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
  500.                                     unsigned int len)
  501. {
  502.     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
  503. }
  504.  
  505. unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
  506.                                 unsigned int len)
  507. {
  508.     return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
  509. }
  510.  
  511. unsigned long ffio_get_checksum(AVIOContext *s)
  512. {
  513.     s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
  514.                                      s->buf_ptr - s->checksum_ptr);
  515.     s->update_checksum = NULL;
  516.     return s->checksum;
  517. }
  518.  
  519. void ffio_init_checksum(AVIOContext *s,
  520.                    unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
  521.                    unsigned long checksum)
  522. {
  523.     s->update_checksum = update_checksum;
  524.     if (s->update_checksum) {
  525.         s->checksum     = checksum;
  526.         s->checksum_ptr = s->buf_ptr;
  527.     }
  528. }
  529.  
  530. /* XXX: put an inline version */
  531. int avio_r8(AVIOContext *s)
  532. {
  533.     if (s->buf_ptr >= s->buf_end)
  534.         fill_buffer(s);
  535.     if (s->buf_ptr < s->buf_end)
  536.         return *s->buf_ptr++;
  537.     return 0;
  538. }
  539.  
  540. int avio_read(AVIOContext *s, unsigned char *buf, int size)
  541. {
  542.     int len, size1;
  543.  
  544.     size1 = size;
  545.     while (size > 0) {
  546.         len = s->buf_end - s->buf_ptr;
  547.         if (len > size)
  548.             len = size;
  549.         if (len == 0 || s->write_flag) {
  550.             if((s->direct || size > s->buffer_size) && !s->update_checksum){
  551.                 if(s->read_packet)
  552.                     len = s->read_packet(s->opaque, buf, size);
  553.                 if (len <= 0) {
  554.                     /* do not modify buffer if EOF reached so that a seek back can
  555.                     be done without rereading data */
  556.                     s->eof_reached = 1;
  557.                     if(len<0)
  558.                         s->error= len;
  559.                     break;
  560.                 } else {
  561.                     s->pos += len;
  562.                     s->bytes_read += len;
  563.                     size -= len;
  564.                     buf += len;
  565.                     s->buf_ptr = s->buffer;
  566.                     s->buf_end = s->buffer/* + len*/;
  567.                 }
  568.             } else {
  569.                 fill_buffer(s);
  570.                 len = s->buf_end - s->buf_ptr;
  571.                 if (len == 0)
  572.                     break;
  573.             }
  574.         } else {
  575.             memcpy(buf, s->buf_ptr, len);
  576.             buf += len;
  577.             s->buf_ptr += len;
  578.             size -= len;
  579.         }
  580.     }
  581.     if (size1 == size) {
  582.         if (s->error)      return s->error;
  583.         if (avio_feof(s))  return AVERROR_EOF;
  584.     }
  585.     return size1 - size;
  586. }
  587.  
  588. int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
  589. {
  590.     int ret = avio_read(s, buf, size);
  591.     if (ret != size)
  592.         return AVERROR_INVALIDDATA;
  593.     return ret;
  594. }
  595.  
  596. int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
  597. {
  598.     if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
  599.         *data = s->buf_ptr;
  600.         s->buf_ptr += size;
  601.         return size;
  602.     } else {
  603.         *data = buf;
  604.         return avio_read(s, buf, size);
  605.     }
  606. }
  607.  
  608. int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
  609. {
  610.     int len;
  611.  
  612.     if (size < 0)
  613.         return -1;
  614.  
  615.     if (s->read_packet && s->write_flag) {
  616.         len = s->read_packet(s->opaque, buf, size);
  617.         if (len > 0)
  618.             s->pos += len;
  619.         return len;
  620.     }
  621.  
  622.     len = s->buf_end - s->buf_ptr;
  623.     if (len == 0) {
  624.         /* Reset the buf_end pointer to the start of the buffer, to make sure
  625.          * the fill_buffer call tries to read as much data as fits into the
  626.          * full buffer, instead of just what space is left after buf_end.
  627.          * This avoids returning partial packets at the end of the buffer,
  628.          * for packet based inputs.
  629.          */
  630.         s->buf_end = s->buf_ptr = s->buffer;
  631.         fill_buffer(s);
  632.         len = s->buf_end - s->buf_ptr;
  633.     }
  634.     if (len > size)
  635.         len = size;
  636.     memcpy(buf, s->buf_ptr, len);
  637.     s->buf_ptr += len;
  638.     if (!len) {
  639.         if (s->error)      return s->error;
  640.         if (avio_feof(s))  return AVERROR_EOF;
  641.     }
  642.     return len;
  643. }
  644.  
  645. unsigned int avio_rl16(AVIOContext *s)
  646. {
  647.     unsigned int val;
  648.     val = avio_r8(s);
  649.     val |= avio_r8(s) << 8;
  650.     return val;
  651. }
  652.  
  653. unsigned int avio_rl24(AVIOContext *s)
  654. {
  655.     unsigned int val;
  656.     val = avio_rl16(s);
  657.     val |= avio_r8(s) << 16;
  658.     return val;
  659. }
  660.  
  661. unsigned int avio_rl32(AVIOContext *s)
  662. {
  663.     unsigned int val;
  664.     val = avio_rl16(s);
  665.     val |= avio_rl16(s) << 16;
  666.     return val;
  667. }
  668.  
  669. uint64_t avio_rl64(AVIOContext *s)
  670. {
  671.     uint64_t val;
  672.     val = (uint64_t)avio_rl32(s);
  673.     val |= (uint64_t)avio_rl32(s) << 32;
  674.     return val;
  675. }
  676.  
  677. unsigned int avio_rb16(AVIOContext *s)
  678. {
  679.     unsigned int val;
  680.     val = avio_r8(s) << 8;
  681.     val |= avio_r8(s);
  682.     return val;
  683. }
  684.  
  685. unsigned int avio_rb24(AVIOContext *s)
  686. {
  687.     unsigned int val;
  688.     val = avio_rb16(s) << 8;
  689.     val |= avio_r8(s);
  690.     return val;
  691. }
  692. unsigned int avio_rb32(AVIOContext *s)
  693. {
  694.     unsigned int val;
  695.     val = avio_rb16(s) << 16;
  696.     val |= avio_rb16(s);
  697.     return val;
  698. }
  699.  
  700. int ff_get_line(AVIOContext *s, char *buf, int maxlen)
  701. {
  702.     int i = 0;
  703.     char c;
  704.  
  705.     do {
  706.         c = avio_r8(s);
  707.         if (c && i < maxlen-1)
  708.             buf[i++] = c;
  709.     } while (c != '\n' && c != '\r' && c);
  710.     if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
  711.         avio_skip(s, -1);
  712.  
  713.     buf[i] = 0;
  714.     return i;
  715. }
  716.  
  717. int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
  718. {
  719.     int i;
  720.  
  721.     if (buflen <= 0)
  722.         return AVERROR(EINVAL);
  723.     // reserve 1 byte for terminating 0
  724.     buflen = FFMIN(buflen - 1, maxlen);
  725.     for (i = 0; i < buflen; i++)
  726.         if (!(buf[i] = avio_r8(s)))
  727.             return i + 1;
  728.     buf[i] = 0;
  729.     for (; i < maxlen; i++)
  730.         if (!avio_r8(s))
  731.             return i + 1;
  732.     return maxlen;
  733. }
  734.  
  735. #define GET_STR16(type, read) \
  736.     int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
  737. {\
  738.     char* q = buf;\
  739.     int ret = 0;\
  740.     if (buflen <= 0) \
  741.         return AVERROR(EINVAL); \
  742.     while (ret + 1 < maxlen) {\
  743.         uint8_t tmp;\
  744.         uint32_t ch;\
  745.         GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
  746.         if (!ch)\
  747.             break;\
  748.         PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
  749.     }\
  750.     *q = 0;\
  751.     return ret;\
  752. }\
  753.  
  754. GET_STR16(le, avio_rl16)
  755. GET_STR16(be, avio_rb16)
  756.  
  757. #undef GET_STR16
  758.  
  759. uint64_t avio_rb64(AVIOContext *s)
  760. {
  761.     uint64_t val;
  762.     val = (uint64_t)avio_rb32(s) << 32;
  763.     val |= (uint64_t)avio_rb32(s);
  764.     return val;
  765. }
  766.  
  767. uint64_t ffio_read_varlen(AVIOContext *bc){
  768.     uint64_t val = 0;
  769.     int tmp;
  770.  
  771.     do{
  772.         tmp = avio_r8(bc);
  773.         val= (val<<7) + (tmp&127);
  774.     }while(tmp&128);
  775.     return val;
  776. }
  777.  
  778. int ffio_fdopen(AVIOContext **s, URLContext *h)
  779. {
  780.     uint8_t *buffer;
  781.     int buffer_size, max_packet_size;
  782.  
  783.     max_packet_size = h->max_packet_size;
  784.     if (max_packet_size) {
  785.         buffer_size = max_packet_size; /* no need to bufferize more than one packet */
  786.     } else {
  787.         buffer_size = IO_BUFFER_SIZE;
  788.     }
  789.     buffer = av_malloc(buffer_size);
  790.     if (!buffer)
  791.         return AVERROR(ENOMEM);
  792.  
  793.     *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
  794.                             (int (*)(void *, uint8_t *, int)) ffurl_read,
  795.                             (int (*)(void *, uint8_t *, int)) ffurl_write,
  796.                             (int64_t (*)(void *, int64_t, int)) ffurl_seek);
  797.     if (!*s) {
  798.         av_free(buffer);
  799.         return AVERROR(ENOMEM);
  800.     }
  801.     (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
  802.     (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
  803.     (*s)->max_packet_size = max_packet_size;
  804.     if(h->prot) {
  805.         (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
  806.         (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
  807.     }
  808.     (*s)->av_class = &ff_avio_class;
  809.     return 0;
  810. }
  811.  
  812. int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
  813. {
  814.     uint8_t *buffer;
  815.     int max_buffer_size = s->max_packet_size ?
  816.                           s->max_packet_size : IO_BUFFER_SIZE;
  817.     int filled = s->buf_end - s->buffer;
  818.     ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
  819.  
  820.     buf_size += s->buf_ptr - s->buffer + max_buffer_size;
  821.  
  822.     if (buf_size < filled || s->seekable || !s->read_packet)
  823.         return 0;
  824.     av_assert0(!s->write_flag);
  825.  
  826.     buffer = av_malloc(buf_size);
  827.     if (!buffer)
  828.         return AVERROR(ENOMEM);
  829.  
  830.     memcpy(buffer, s->buffer, filled);
  831.     av_free(s->buffer);
  832.     s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
  833.     s->buf_end = buffer + (s->buf_end - s->buffer);
  834.     s->buffer = buffer;
  835.     s->buffer_size = buf_size;
  836.     if (checksum_ptr_offset >= 0)
  837.         s->checksum_ptr = s->buffer + checksum_ptr_offset;
  838.     return 0;
  839. }
  840.  
  841. int ffio_set_buf_size(AVIOContext *s, int buf_size)
  842. {
  843.     uint8_t *buffer;
  844.     buffer = av_malloc(buf_size);
  845.     if (!buffer)
  846.         return AVERROR(ENOMEM);
  847.  
  848.     av_free(s->buffer);
  849.     s->buffer = buffer;
  850.     s->orig_buffer_size =
  851.     s->buffer_size = buf_size;
  852.     s->buf_ptr = buffer;
  853.     url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
  854.     return 0;
  855. }
  856.  
  857. static int url_resetbuf(AVIOContext *s, int flags)
  858. {
  859.     av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
  860.  
  861.     if (flags & AVIO_FLAG_WRITE) {
  862.         s->buf_end = s->buffer + s->buffer_size;
  863.         s->write_flag = 1;
  864.     } else {
  865.         s->buf_end = s->buffer;
  866.         s->write_flag = 0;
  867.     }
  868.     return 0;
  869. }
  870.  
  871. int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
  872. {
  873.     int64_t buffer_start;
  874.     int buffer_size;
  875.     int overlap, new_size, alloc_size;
  876.     uint8_t *buf = *bufp;
  877.  
  878.     if (s->write_flag) {
  879.         av_freep(bufp);
  880.         return AVERROR(EINVAL);
  881.     }
  882.  
  883.     buffer_size = s->buf_end - s->buffer;
  884.  
  885.     /* the buffers must touch or overlap */
  886.     if ((buffer_start = s->pos - buffer_size) > buf_size) {
  887.         av_freep(bufp);
  888.         return AVERROR(EINVAL);
  889.     }
  890.  
  891.     overlap = buf_size - buffer_start;
  892.     new_size = buf_size + buffer_size - overlap;
  893.  
  894.     alloc_size = FFMAX(s->buffer_size, new_size);
  895.     if (alloc_size > buf_size)
  896.         if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
  897.             return AVERROR(ENOMEM);
  898.  
  899.     if (new_size > buf_size) {
  900.         memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
  901.         buf_size = new_size;
  902.     }
  903.  
  904.     av_free(s->buffer);
  905.     s->buf_ptr = s->buffer = buf;
  906.     s->buffer_size = alloc_size;
  907.     s->pos = buf_size;
  908.     s->buf_end = s->buf_ptr + buf_size;
  909.     s->eof_reached = 0;
  910.     s->must_flush = 0;
  911.  
  912.     return 0;
  913. }
  914.  
  915. int avio_open(AVIOContext **s, const char *filename, int flags)
  916. {
  917.     return avio_open2(s, filename, flags, NULL, NULL);
  918. }
  919.  
  920. int avio_open2(AVIOContext **s, const char *filename, int flags,
  921.                const AVIOInterruptCB *int_cb, AVDictionary **options)
  922. {
  923.     URLContext *h;
  924.     int err;
  925.  
  926.     err = ffurl_open(&h, filename, flags, int_cb, options);
  927.     if (err < 0)
  928.         return err;
  929.     err = ffio_fdopen(s, h);
  930.     if (err < 0) {
  931.         ffurl_close(h);
  932.         return err;
  933.     }
  934.     return 0;
  935. }
  936.  
  937. int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
  938.                        const AVIOInterruptCB *int_cb, AVDictionary **options)
  939. {
  940.     return avio_open2(pb, url, flags, int_cb, options);
  941. }
  942.  
  943. int avio_close(AVIOContext *s)
  944. {
  945.     URLContext *h;
  946.  
  947.     if (!s)
  948.         return 0;
  949.  
  950.     avio_flush(s);
  951.     h = s->opaque;
  952.     av_freep(&s->buffer);
  953.     if (s->write_flag)
  954.         av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
  955.     else
  956.         av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
  957.     av_free(s);
  958.     return ffurl_close(h);
  959. }
  960.  
  961. int avio_closep(AVIOContext **s)
  962. {
  963.     int ret = avio_close(*s);
  964.     *s = NULL;
  965.     return ret;
  966. }
  967.  
  968. int avio_printf(AVIOContext *s, const char *fmt, ...)
  969. {
  970.     va_list ap;
  971.     char buf[4096];
  972.     int ret;
  973.  
  974.     va_start(ap, fmt);
  975.     ret = vsnprintf(buf, sizeof(buf), fmt, ap);
  976.     va_end(ap);
  977.     avio_write(s, buf, strlen(buf));
  978.     return ret;
  979. }
  980.  
  981. int avio_pause(AVIOContext *s, int pause)
  982. {
  983.     if (!s->read_pause)
  984.         return AVERROR(ENOSYS);
  985.     return s->read_pause(s->opaque, pause);
  986. }
  987.  
  988. int64_t avio_seek_time(AVIOContext *s, int stream_index,
  989.                        int64_t timestamp, int flags)
  990. {
  991.     URLContext *h = s->opaque;
  992.     int64_t ret;
  993.     if (!s->read_seek)
  994.         return AVERROR(ENOSYS);
  995.     ret = s->read_seek(h, stream_index, timestamp, flags);
  996.     if (ret >= 0) {
  997.         int64_t pos;
  998.         s->buf_ptr = s->buf_end; // Flush buffer
  999.         pos = s->seek(h, 0, SEEK_CUR);
  1000.         if (pos >= 0)
  1001.             s->pos = pos;
  1002.         else if (pos != AVERROR(ENOSYS))
  1003.             ret = pos;
  1004.     }
  1005.     return ret;
  1006. }
  1007.  
  1008. int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
  1009. {
  1010.     int ret;
  1011.     char buf[1024];
  1012.     while (max_size) {
  1013.         ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
  1014.         if (ret == AVERROR_EOF)
  1015.             return 0;
  1016.         if (ret <= 0)
  1017.             return ret;
  1018.         av_bprint_append_data(pb, buf, ret);
  1019.         if (!av_bprint_is_complete(pb))
  1020.             return AVERROR(ENOMEM);
  1021.         max_size -= ret;
  1022.     }
  1023.     return 0;
  1024. }
  1025.  
  1026. int avio_accept(AVIOContext *s, AVIOContext **c)
  1027. {
  1028.     int ret;
  1029.     URLContext *sc = s->opaque;
  1030.     URLContext *cc = NULL;
  1031.     ret = ffurl_accept(sc, &cc);
  1032.     if (ret < 0)
  1033.         return ret;
  1034.     return ffio_fdopen(c, cc);
  1035. }
  1036.  
  1037. int avio_handshake(AVIOContext *c)
  1038. {
  1039.     URLContext *cc = c->opaque;
  1040.     return ffurl_handshake(cc);
  1041. }
  1042.  
  1043. /* output in a dynamic buffer */
  1044.  
  1045. typedef struct DynBuffer {
  1046.     int pos, size, allocated_size;
  1047.     uint8_t *buffer;
  1048.     int io_buffer_size;
  1049.     uint8_t io_buffer[1];
  1050. } DynBuffer;
  1051.  
  1052. static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
  1053. {
  1054.     DynBuffer *d = opaque;
  1055.     unsigned new_size, new_allocated_size;
  1056.  
  1057.     /* reallocate buffer if needed */
  1058.     new_size = d->pos + buf_size;
  1059.     new_allocated_size = d->allocated_size;
  1060.     if (new_size < d->pos || new_size > INT_MAX/2)
  1061.         return -1;
  1062.     while (new_size > new_allocated_size) {
  1063.         if (!new_allocated_size)
  1064.             new_allocated_size = new_size;
  1065.         else
  1066.             new_allocated_size += new_allocated_size / 2 + 1;
  1067.     }
  1068.  
  1069.     if (new_allocated_size > d->allocated_size) {
  1070.         int err;
  1071.         if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
  1072.             d->allocated_size = 0;
  1073.             d->size = 0;
  1074.             return err;
  1075.         }
  1076.         d->allocated_size = new_allocated_size;
  1077.     }
  1078.     memcpy(d->buffer + d->pos, buf, buf_size);
  1079.     d->pos = new_size;
  1080.     if (d->pos > d->size)
  1081.         d->size = d->pos;
  1082.     return buf_size;
  1083. }
  1084.  
  1085. static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
  1086. {
  1087.     unsigned char buf1[4];
  1088.     int ret;
  1089.  
  1090.     /* packetized write: output the header */
  1091.     AV_WB32(buf1, buf_size);
  1092.     ret = dyn_buf_write(opaque, buf1, 4);
  1093.     if (ret < 0)
  1094.         return ret;
  1095.  
  1096.     /* then the data */
  1097.     return dyn_buf_write(opaque, buf, buf_size);
  1098. }
  1099.  
  1100. static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
  1101. {
  1102.     DynBuffer *d = opaque;
  1103.  
  1104.     if (whence == SEEK_CUR)
  1105.         offset += d->pos;
  1106.     else if (whence == SEEK_END)
  1107.         offset += d->size;
  1108.     if (offset < 0 || offset > 0x7fffffffLL)
  1109.         return -1;
  1110.     d->pos = offset;
  1111.     return 0;
  1112. }
  1113.  
  1114. static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
  1115. {
  1116.     DynBuffer *d;
  1117.     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
  1118.  
  1119.     if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
  1120.         return -1;
  1121.     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
  1122.     if (!d)
  1123.         return AVERROR(ENOMEM);
  1124.     d->io_buffer_size = io_buffer_size;
  1125.     *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
  1126.                             max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
  1127.                             max_packet_size ? NULL : dyn_buf_seek);
  1128.     if(!*s) {
  1129.         av_free(d);
  1130.         return AVERROR(ENOMEM);
  1131.     }
  1132.     (*s)->max_packet_size = max_packet_size;
  1133.     return 0;
  1134. }
  1135.  
  1136. int avio_open_dyn_buf(AVIOContext **s)
  1137. {
  1138.     return url_open_dyn_buf_internal(s, 0);
  1139. }
  1140.  
  1141. int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
  1142. {
  1143.     if (max_packet_size <= 0)
  1144.         return -1;
  1145.     return url_open_dyn_buf_internal(s, max_packet_size);
  1146. }
  1147.  
  1148. int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
  1149. {
  1150.     DynBuffer *d;
  1151.     int size;
  1152.     static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
  1153.     int padding = 0;
  1154.  
  1155.     if (!s) {
  1156.         *pbuffer = NULL;
  1157.         return 0;
  1158.     }
  1159.  
  1160.     /* don't attempt to pad fixed-size packet buffers */
  1161.     if (!s->max_packet_size) {
  1162.         avio_write(s, padbuf, sizeof(padbuf));
  1163.         padding = AV_INPUT_BUFFER_PADDING_SIZE;
  1164.     }
  1165.  
  1166.     avio_flush(s);
  1167.  
  1168.     d = s->opaque;
  1169.     *pbuffer = d->buffer;
  1170.     size = d->size;
  1171.     av_free(d);
  1172.     av_free(s);
  1173.     return size - padding;
  1174. }
  1175.  
  1176. void ffio_free_dyn_buf(AVIOContext **s)
  1177. {
  1178.     uint8_t *tmp;
  1179.     if (!*s)
  1180.         return;
  1181.     avio_close_dyn_buf(*s, &tmp);
  1182.     av_free(tmp);
  1183.     *s = NULL;
  1184. }
  1185.  
  1186. static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
  1187. {
  1188.     DynBuffer *d = opaque;
  1189.  
  1190.     d->pos += buf_size;
  1191.     if (d->pos > d->size)
  1192.         d->size = d->pos;
  1193.     return buf_size;
  1194. }
  1195.  
  1196. int ffio_open_null_buf(AVIOContext **s)
  1197. {
  1198.     int ret = url_open_dyn_buf_internal(s, 0);
  1199.     if (ret >= 0) {
  1200.         AVIOContext *pb = *s;
  1201.         pb->write_packet = null_buf_write;
  1202.     }
  1203.     return ret;
  1204. }
  1205.  
  1206. int ffio_close_null_buf(AVIOContext *s)
  1207. {
  1208.     DynBuffer *d = s->opaque;
  1209.     int size;
  1210.  
  1211.     avio_flush(s);
  1212.  
  1213.     size = d->size;
  1214.     av_free(d);
  1215.     av_free(s);
  1216.     return size;
  1217. }
  1218.