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  1. /*
  2.  * unbuffered I/O
  3.  * Copyright (c) 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/avstring.h"
  23. #include "libavutil/dict.h"
  24. #include "libavutil/opt.h"
  25. #include "libavutil/time.h"
  26. #include "os_support.h"
  27. #include "avformat.h"
  28. #if CONFIG_NETWORK
  29. #include "network.h"
  30. #endif
  31. #include "url.h"
  32.  
  33. static URLProtocol *first_protocol = NULL;
  34.  
  35. URLProtocol *ffurl_protocol_next(URLProtocol *prev)
  36. {
  37.     return prev ? prev->next : first_protocol;
  38. }
  39.  
  40. /** @name Logging context. */
  41. /*@{*/
  42. static const char *urlcontext_to_name(void *ptr)
  43. {
  44.     URLContext *h = (URLContext *)ptr;
  45.     if(h->prot) return h->prot->name;
  46.     else        return "NULL";
  47. }
  48.  
  49. static void *urlcontext_child_next(void *obj, void *prev)
  50. {
  51.     URLContext *h = obj;
  52.     if (!prev && h->priv_data && h->prot->priv_data_class)
  53.         return h->priv_data;
  54.     return NULL;
  55. }
  56.  
  57. static const AVClass *urlcontext_child_class_next(const AVClass *prev)
  58. {
  59.     URLProtocol *p = NULL;
  60.  
  61.     /* find the protocol that corresponds to prev */
  62.     while (prev && (p = ffurl_protocol_next(p)))
  63.         if (p->priv_data_class == prev)
  64.             break;
  65.  
  66.     /* find next protocol with priv options */
  67.     while (p = ffurl_protocol_next(p))
  68.         if (p->priv_data_class)
  69.             return p->priv_data_class;
  70.     return NULL;
  71.  
  72. }
  73.  
  74. static const AVOption options[] = {{NULL}};
  75. const AVClass ffurl_context_class = {
  76.     .class_name     = "URLContext",
  77.     .item_name      = urlcontext_to_name,
  78.     .option         = options,
  79.     .version        = LIBAVUTIL_VERSION_INT,
  80.     .child_next     = urlcontext_child_next,
  81.     .child_class_next = urlcontext_child_class_next,
  82. };
  83. /*@}*/
  84.  
  85.  
  86. const char *avio_enum_protocols(void **opaque, int output)
  87. {
  88.     URLProtocol *p;
  89.     *opaque = ffurl_protocol_next(*opaque);
  90.     if (!(p = *opaque)) return NULL;
  91.     if ((output && p->url_write) || (!output && p->url_read))
  92.         return p->name;
  93.     return avio_enum_protocols(opaque, output);
  94. }
  95.  
  96. int ffurl_register_protocol(URLProtocol *protocol, int size)
  97. {
  98.     URLProtocol **p;
  99.     if (size < sizeof(URLProtocol)) {
  100.         URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
  101.         memcpy(temp, protocol, size);
  102.         protocol = temp;
  103.     }
  104.     p = &first_protocol;
  105.     while (*p != NULL) p = &(*p)->next;
  106.     *p = protocol;
  107.     protocol->next = NULL;
  108.     return 0;
  109. }
  110.  
  111. static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
  112.                                    const char *filename, int flags,
  113.                                    const AVIOInterruptCB *int_cb)
  114. {
  115.     URLContext *uc;
  116.     int err;
  117.  
  118. #if CONFIG_NETWORK
  119.     if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
  120.         return AVERROR(EIO);
  121. #endif
  122.     if ((flags & AVIO_FLAG_READ) && !up->url_read) {
  123.         av_log(NULL, AV_LOG_ERROR,
  124.                "Impossible to open the '%s' protocol for reading\n", up->name);
  125.         return AVERROR(EIO);
  126.     }
  127.     if ((flags & AVIO_FLAG_WRITE) && !up->url_write) {
  128.         av_log(NULL, AV_LOG_ERROR,
  129.                "Impossible to open the '%s' protocol for writing\n", up->name);
  130.         return AVERROR(EIO);
  131.     }
  132.     uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
  133.     if (!uc) {
  134.         err = AVERROR(ENOMEM);
  135.         goto fail;
  136.     }
  137.     uc->av_class = &ffurl_context_class;
  138.     uc->filename = (char *) &uc[1];
  139.     strcpy(uc->filename, filename);
  140.     uc->prot = up;
  141.     uc->flags = flags;
  142.     uc->is_streamed = 0; /* default = not streamed */
  143.     uc->max_packet_size = 0; /* default: stream file */
  144.     if (up->priv_data_size) {
  145.         uc->priv_data = av_mallocz(up->priv_data_size);
  146.         if (!uc->priv_data) {
  147.             err = AVERROR(ENOMEM);
  148.             goto fail;
  149.         }
  150.         if (up->priv_data_class) {
  151.             int proto_len= strlen(up->name);
  152.             char *start = strchr(uc->filename, ',');
  153.             *(const AVClass**)uc->priv_data = up->priv_data_class;
  154.             av_opt_set_defaults(uc->priv_data);
  155.             if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
  156.                 int ret= 0;
  157.                 char *p= start;
  158.                 char sep= *++p;
  159.                 char *key, *val;
  160.                 p++;
  161.                 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
  162.                     *val= *key= 0;
  163.                     ret= av_opt_set(uc->priv_data, p, key+1, 0);
  164.                     if (ret == AVERROR_OPTION_NOT_FOUND)
  165.                         av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
  166.                     *val= *key= sep;
  167.                     p= val+1;
  168.                 }
  169.                 if(ret<0 || p!=key){
  170.                     av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
  171.                     av_freep(&uc->priv_data);
  172.                     av_freep(&uc);
  173.                     err = AVERROR(EINVAL);
  174.                     goto fail;
  175.                 }
  176.                 memmove(start, key+1, strlen(key));
  177.             }
  178.         }
  179.     }
  180.     if (int_cb)
  181.         uc->interrupt_callback = *int_cb;
  182.  
  183.     *puc = uc;
  184.     return 0;
  185.  fail:
  186.     *puc = NULL;
  187.     if (uc)
  188.         av_freep(&uc->priv_data);
  189.     av_freep(&uc);
  190. #if CONFIG_NETWORK
  191.     if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
  192.         ff_network_close();
  193. #endif
  194.     return err;
  195. }
  196.  
  197. int ffurl_connect(URLContext* uc, AVDictionary **options)
  198. {
  199.     int err =
  200.         uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
  201.         uc->prot->url_open(uc, uc->filename, uc->flags);
  202.     if (err)
  203.         return err;
  204.     uc->is_connected = 1;
  205.     //We must be careful here as ffurl_seek() could be slow, for example for http
  206.     if(   (uc->flags & AVIO_FLAG_WRITE)
  207.        || !strcmp(uc->prot->name, "file"))
  208.         if(!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
  209.             uc->is_streamed= 1;
  210.     return 0;
  211. }
  212.  
  213. #define URL_SCHEME_CHARS                        \
  214.     "abcdefghijklmnopqrstuvwxyz"                \
  215.     "ABCDEFGHIJKLMNOPQRSTUVWXYZ"                \
  216.     "0123456789+-."
  217.  
  218. int ffurl_alloc(URLContext **puc, const char *filename, int flags,
  219.                 const AVIOInterruptCB *int_cb)
  220. {
  221.     URLProtocol *up = NULL;
  222.     char proto_str[128], proto_nested[128], *ptr;
  223.     size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
  224.  
  225.     if (!first_protocol) {
  226.         av_log(NULL, AV_LOG_WARNING, "No URL Protocols are registered. "
  227.                                      "Missing call to av_register_all()?\n");
  228.     }
  229.  
  230.     if (filename[proto_len] != ':' &&
  231.         (filename[proto_len] != ',' || !strchr(filename + proto_len + 1, ':')) ||
  232.         is_dos_path(filename))
  233.         strcpy(proto_str, "file");
  234.     else
  235.         av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
  236.  
  237.     if ((ptr = strchr(proto_str, ',')))
  238.         *ptr = '\0';
  239.     av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
  240.     if ((ptr = strchr(proto_nested, '+')))
  241.         *ptr = '\0';
  242.  
  243.     while (up = ffurl_protocol_next(up)) {
  244.         if (!strcmp(proto_str, up->name))
  245.             return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
  246.         if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
  247.             !strcmp(proto_nested, up->name))
  248.             return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
  249.     }
  250.     *puc = NULL;
  251.     if (!strcmp("https", proto_str))
  252.         av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile with openssl or gnutls enabled.\n");
  253.     return AVERROR_PROTOCOL_NOT_FOUND;
  254. }
  255.  
  256. int ffurl_open(URLContext **puc, const char *filename, int flags,
  257.                const AVIOInterruptCB *int_cb, AVDictionary **options)
  258. {
  259.     int ret = ffurl_alloc(puc, filename, flags, int_cb);
  260.     if (ret)
  261.         return ret;
  262.     if (options && (*puc)->prot->priv_data_class &&
  263.         (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
  264.         goto fail;
  265.     ret = ffurl_connect(*puc, options);
  266.     if (!ret)
  267.         return 0;
  268. fail:
  269.     ffurl_close(*puc);
  270.     *puc = NULL;
  271.     return ret;
  272. }
  273.  
  274. static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
  275.                                          int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
  276. {
  277.     int ret, len;
  278.     int fast_retries = 5;
  279.     int64_t wait_since = 0;
  280.  
  281.     len = 0;
  282.     while (len < size_min) {
  283.         if (ff_check_interrupt(&h->interrupt_callback))
  284.             return AVERROR_EXIT;
  285.         ret = transfer_func(h, buf+len, size-len);
  286.         if (ret == AVERROR(EINTR))
  287.             continue;
  288.         if (h->flags & AVIO_FLAG_NONBLOCK)
  289.             return ret;
  290.         if (ret == AVERROR(EAGAIN)) {
  291.             ret = 0;
  292.             if (fast_retries) {
  293.                 fast_retries--;
  294.             } else {
  295.                 if (h->rw_timeout) {
  296.                     if (!wait_since)
  297.                         wait_since = av_gettime();
  298.                     else if (av_gettime() > wait_since + h->rw_timeout)
  299.                         return AVERROR(EIO);
  300.                 }
  301.                 av_usleep(1000);
  302.             }
  303.         } else if (ret < 1)
  304.             return (ret < 0 && ret != AVERROR_EOF) ? ret : len;
  305.         if (ret)
  306.            fast_retries = FFMAX(fast_retries, 2);
  307.         len += ret;
  308.     }
  309.     return len;
  310. }
  311.  
  312. int ffurl_read(URLContext *h, unsigned char *buf, int size)
  313. {
  314.     if (!(h->flags & AVIO_FLAG_READ))
  315.         return AVERROR(EIO);
  316.     return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
  317. }
  318.  
  319. int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
  320. {
  321.     if (!(h->flags & AVIO_FLAG_READ))
  322.         return AVERROR(EIO);
  323.     return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
  324. }
  325.  
  326. int ffurl_write(URLContext *h, const unsigned char *buf, int size)
  327. {
  328.     if (!(h->flags & AVIO_FLAG_WRITE))
  329.         return AVERROR(EIO);
  330.     /* avoid sending too big packets */
  331.     if (h->max_packet_size && size > h->max_packet_size)
  332.         return AVERROR(EIO);
  333.  
  334.     return retry_transfer_wrapper(h, (unsigned char *)buf, size, size, (void*)h->prot->url_write);
  335. }
  336.  
  337. int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
  338. {
  339.     int64_t ret;
  340.  
  341.     if (!h->prot->url_seek)
  342.         return AVERROR(ENOSYS);
  343.     ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
  344.     return ret;
  345. }
  346.  
  347. int ffurl_closep(URLContext **hh)
  348. {
  349.     URLContext *h= *hh;
  350.     int ret = 0;
  351.     if (!h) return 0; /* can happen when ffurl_open fails */
  352.  
  353.     if (h->is_connected && h->prot->url_close)
  354.         ret = h->prot->url_close(h);
  355. #if CONFIG_NETWORK
  356.     if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
  357.         ff_network_close();
  358. #endif
  359.     if (h->prot->priv_data_size) {
  360.         if (h->prot->priv_data_class)
  361.             av_opt_free(h->priv_data);
  362.         av_freep(&h->priv_data);
  363.     }
  364.     av_freep(hh);
  365.     return ret;
  366. }
  367.  
  368. int ffurl_close(URLContext *h)
  369. {
  370.     return ffurl_closep(&h);
  371. }
  372.  
  373.  
  374. int avio_check(const char *url, int flags)
  375. {
  376.     URLContext *h;
  377.     int ret = ffurl_alloc(&h, url, flags, NULL);
  378.     if (ret)
  379.         return ret;
  380.  
  381.     if (h->prot->url_check) {
  382.         ret = h->prot->url_check(h, flags);
  383.     } else {
  384.         ret = ffurl_connect(h, NULL);
  385.         if (ret >= 0)
  386.             ret = flags;
  387.     }
  388.  
  389.     ffurl_close(h);
  390.     return ret;
  391. }
  392.  
  393. int64_t ffurl_size(URLContext *h)
  394. {
  395.     int64_t pos, size;
  396.  
  397.     size= ffurl_seek(h, 0, AVSEEK_SIZE);
  398.     if(size<0){
  399.         pos = ffurl_seek(h, 0, SEEK_CUR);
  400.         if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
  401.             return size;
  402.         size++;
  403.         ffurl_seek(h, pos, SEEK_SET);
  404.     }
  405.     return size;
  406. }
  407.  
  408. int ffurl_get_file_handle(URLContext *h)
  409. {
  410.     if (!h->prot->url_get_file_handle)
  411.         return -1;
  412.     return h->prot->url_get_file_handle(h);
  413. }
  414.  
  415. int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
  416. {
  417.     if (!h->prot->url_get_multi_file_handle) {
  418.         if (!h->prot->url_get_file_handle)
  419.             return AVERROR(ENOSYS);
  420.         *handles = av_malloc(sizeof(**handles));
  421.         if (!*handles)
  422.             return AVERROR(ENOMEM);
  423.         *numhandles = 1;
  424.         *handles[0] = h->prot->url_get_file_handle(h);
  425.         return 0;
  426.     }
  427.     return h->prot->url_get_multi_file_handle(h, handles, numhandles);
  428. }
  429.  
  430. int ffurl_shutdown(URLContext *h, int flags)
  431. {
  432.     if (!h->prot->url_shutdown)
  433.         return AVERROR(EINVAL);
  434.     return h->prot->url_shutdown(h, flags);
  435. }
  436.  
  437. int ff_check_interrupt(AVIOInterruptCB *cb)
  438. {
  439.     int ret;
  440.     if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
  441.         return ret;
  442.     return 0;
  443. }
  444.