/* * This file is part of mpv. * * mpv is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * mpv is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with mpv. If not, see . */ #include #include #include #include #include #include #include #include #include #include "osdep/atomics.h" #include "osdep/io.h" #include "mpv_talloc.h" #include "config.h" #include "common/common.h" #include "common/global.h" #include "misc/bstr.h" #include "common/msg.h" #include "options/options.h" #include "options/path.h" #include "osdep/timer.h" #include "stream.h" #include "options/m_option.h" #include "options/m_config.h" #ifdef __MINGW32__ #include #else #include #endif // Includes additional padding in case sizes get rounded up by sector size. #define TOTAL_BUFFER_SIZE (STREAM_MAX_BUFFER_SIZE + STREAM_MAX_SECTOR_SIZE) extern const stream_info_t stream_info_cdda; extern const stream_info_t stream_info_dvb; extern const stream_info_t stream_info_tv; extern const stream_info_t stream_info_smb; extern const stream_info_t stream_info_null; extern const stream_info_t stream_info_memory; extern const stream_info_t stream_info_mf; extern const stream_info_t stream_info_ffmpeg; extern const stream_info_t stream_info_ffmpeg_unsafe; extern const stream_info_t stream_info_avdevice; extern const stream_info_t stream_info_file; extern const stream_info_t stream_info_ifo; extern const stream_info_t stream_info_ifo_dvdnav; extern const stream_info_t stream_info_dvd; extern const stream_info_t stream_info_dvdnav; extern const stream_info_t stream_info_bdmv_dir; extern const stream_info_t stream_info_bluray; extern const stream_info_t stream_info_bdnav; extern const stream_info_t stream_info_rar; extern const stream_info_t stream_info_edl; extern const stream_info_t stream_info_libarchive; static const stream_info_t *const stream_list[] = { #if HAVE_CDDA &stream_info_cdda, #endif &stream_info_ffmpeg, &stream_info_ffmpeg_unsafe, &stream_info_avdevice, #if HAVE_DVBIN &stream_info_dvb, #endif #if HAVE_TV &stream_info_tv, #endif #if HAVE_LIBSMBCLIENT &stream_info_smb, #endif #if HAVE_DVDREAD &stream_info_ifo, &stream_info_dvd, #endif #if HAVE_DVDNAV &stream_info_ifo_dvdnav, &stream_info_dvdnav, #endif #if HAVE_LIBBLURAY &stream_info_bdmv_dir, &stream_info_bluray, &stream_info_bdnav, #endif #if HAVE_LIBARCHIVE &stream_info_libarchive, #endif &stream_info_memory, &stream_info_null, &stream_info_mf, &stream_info_edl, &stream_info_rar, &stream_info_file, NULL }; static bool stream_seek_unbuffered(stream_t *s, int64_t newpos); static int from_hex(unsigned char c) { if (c >= 'a' && c <= 'f') return c - 'a' + 10; if (c >= 'A' && c <= 'F') return c - 'A' + 10; if (c >= '0' && c <= '9') return c - '0'; return -1; } // Replace escape sequences in an URL (or a part of an URL) void mp_url_unescape_inplace(char *buf) { int len = strlen(buf); int o = 0; for (int i = 0; i < len; i++) { unsigned char c = buf[i]; if (c == '%' && i + 2 < len) { //must have 2 more chars int c1 = from_hex(buf[i + 1]); int c2 = from_hex(buf[i + 2]); if (c1 >= 0 && c2 >= 0) { c = c1 * 16 + c2; i = i + 2; //only skip next 2 chars if valid esc } } buf[o++] = c; } buf[o++] = '\0'; } // Escape according to http://tools.ietf.org/html/rfc3986#section-2.1 // Only unreserved characters are not escaped. // The argument ok (if not NULL) is as follows: // ok[0] != '~': additional characters that are not escaped // ok[0] == '~': do not escape anything but these characters // (can't override the unreserved characters, which are // never escaped) char *mp_url_escape(void *talloc_ctx, const char *s, const char *ok) { int len = strlen(s); char *buf = talloc_array(talloc_ctx, char, len * 3 + 1); int o = 0; for (int i = 0; i < len; i++) { unsigned char c = s[i]; if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || strchr("-._~", c) || (ok && ((ok[0] != '~') == !!strchr(ok, c)))) { buf[o++] = c; } else { const char hex[] = "0123456789ABCDEF"; buf[o++] = '%'; buf[o++] = hex[c / 16]; buf[o++] = hex[c % 16]; } } buf[o++] = '\0'; return buf; } static const char *find_url_opt(struct stream *s, const char *opt) { for (int n = 0; s->info->url_options && s->info->url_options[n]; n++) { const char *entry = s->info->url_options[n]; const char *t = strchr(entry, '='); assert(t); if (strncmp(opt, entry, t - entry) == 0) return t + 1; } return NULL; } static bstr split_next(bstr *s, char end, const char *delim) { int idx = bstrcspn(*s, delim); if (end && (idx >= s->len || s->start[idx] != end)) return (bstr){0}; bstr r = bstr_splice(*s, 0, idx); *s = bstr_cut(*s, idx + (end ? 1 : 0)); return r; } // Parse the stream URL, syntax: // proto:// [@][:][/] // (the proto:// part is already removed from s->path) // This code originates from times when http code used this, but now it's // just relict from other stream implementations reusing this code. static bool parse_url(struct stream *st, struct m_config *config) { bstr s = bstr0(st->path); const char *f_names[4] = {"username", "hostname", "port", "filename"}; bstr f[4]; f[0] = split_next(&s, '@', "@:/"); f[1] = split_next(&s, 0, ":/"); f[2] = bstr_eatstart0(&s, ":") ? split_next(&s, 0, "/") : (bstr){0}; f[3] = bstr_eatstart0(&s, "/") ? s : (bstr){0}; for (int n = 0; n < 4; n++) { if (f[n].len) { const char *opt = find_url_opt(st, f_names[n]); if (!opt) { MP_ERR(st, "Stream type '%s' accepts no '%s' field in URLs.\n", st->info->name, f_names[n]); return false; } int r = m_config_set_option(config, bstr0(opt), f[n]); if (r < 0) { MP_ERR(st, "Error setting stream option: %s\n", m_option_strerror(r)); return false; } } } return true; } static stream_t *new_stream(void) { return talloc_zero_size(NULL, sizeof(stream_t) + TOTAL_BUFFER_SIZE); } static const char *match_proto(const char *url, const char *proto) { int l = strlen(proto); if (l > 0) { if (strncasecmp(url, proto, l) == 0 && strncmp("://", url + l, 3) == 0) return url + l + 3; } else if (!mp_is_url(bstr0(url))) { return url; // pure filenames } return NULL; } static int open_internal(const stream_info_t *sinfo, const char *url, int flags, struct mp_cancel *c, struct mpv_global *global, struct stream **ret) { if (!sinfo->is_safe && (flags & STREAM_SAFE_ONLY)) return STREAM_UNSAFE; if (!sinfo->is_network && (flags & STREAM_NETWORK_ONLY)) return STREAM_UNSAFE; const char *path = NULL; for (int n = 0; sinfo->protocols && sinfo->protocols[n]; n++) { path = match_proto(url, sinfo->protocols[n]); if (path) break; } if (!path) return STREAM_NO_MATCH; stream_t *s = new_stream(); s->log = mp_log_new(s, global->log, sinfo->name); s->info = sinfo; s->opts = global->opts; s->cancel = c; s->global = global; s->url = talloc_strdup(s, url); s->path = talloc_strdup(s, path); s->allow_caching = true; s->is_network = sinfo->is_network; s->mode = flags & (STREAM_READ | STREAM_WRITE); MP_VERBOSE(s, "Opening %s\n", url); if ((s->mode & STREAM_WRITE) && !sinfo->can_write) { MP_VERBOSE(s, "No write access implemented.\n"); talloc_free(s); return STREAM_NO_MATCH; } // Parse options if (sinfo->priv_size) { struct m_obj_desc desc = { .priv_size = sinfo->priv_size, .priv_defaults = sinfo->priv_defaults, .options = sinfo->options, }; if (sinfo->get_defaults) desc.priv_defaults = sinfo->get_defaults(s); struct m_config *config = m_config_from_obj_desc(s, s->log, &desc); s->priv = config->optstruct; if (s->info->url_options && !parse_url(s, config)) { MP_ERR(s, "URL parsing failed on url %s\n", url); talloc_free(s); return STREAM_ERROR; } } int r = (sinfo->open)(s); if (r != STREAM_OK) { talloc_free(s); return r; } if (!s->read_chunk) s->read_chunk = 4 * (s->sector_size ? s->sector_size : STREAM_BUFFER_SIZE); if (!s->fill_buffer) s->allow_caching = false; assert(s->seekable == !!s->seek); s->uncached_type = s->type; if (s->mime_type) MP_VERBOSE(s, "Mime-type: '%s'\n", s->mime_type); MP_VERBOSE(s, "Stream opened successfully.\n"); *ret = s; return STREAM_OK; } struct stream *stream_create(const char *url, int flags, struct mp_cancel *c, struct mpv_global *global) { struct mp_log *log = mp_log_new(NULL, global->log, "!stream"); struct stream *s = NULL; assert(url); if (strlen(url) > INT_MAX / 8) goto done; // Open stream proper bool unsafe = false; for (int i = 0; stream_list[i]; i++) { int r = open_internal(stream_list[i], url, flags, c, global, &s); if (r == STREAM_OK) break; if (r == STREAM_NO_MATCH || r == STREAM_UNSUPPORTED) continue; if (r == STREAM_UNSAFE) { unsafe = true; continue; } if (r != STREAM_OK) { mp_err(log, "Failed to open %s.\n", url); goto done; } } if (!s && unsafe) { mp_err(log, "\nRefusing to load potentially unsafe URL from a playlist.\n" "Use --playlist=file or the --load-unsafe-playlists option to " "load it anyway.\n\n"); goto done; } if (!s) { mp_err(log, "No protocol handler found to open URL %s\n", url); mp_err(log, "The protocol is either unsupported, or was disabled " "at compile-time.\n"); goto done; } done: talloc_free(log); return s; } struct stream *stream_open(const char *filename, struct mpv_global *global) { return stream_create(filename, STREAM_READ, NULL, global); } stream_t *open_output_stream(const char *filename, struct mpv_global *global) { return stream_create(filename, STREAM_WRITE, NULL, global); } static bool stream_reconnect(stream_t *s) { if (!s->streaming || s->uncached_stream || !s->seekable || !s->cancel) return false; int64_t pos = s->pos; double sleep_secs = 0; for (int retry = 0; retry < 6; retry++) { if (mp_cancel_wait(s->cancel, sleep_secs)) break; int r = stream_control(s, STREAM_CTRL_RECONNECT, NULL); if (r == STREAM_UNSUPPORTED) break; if (r == STREAM_OK && stream_seek_unbuffered(s, pos) && s->pos == pos) { MP_WARN(s, "Reconnected successfully.\n"); return true; } MP_WARN(s, "Connection lost! Attempting to reconnect (%d)...\n", retry + 1); sleep_secs = MPMAX(sleep_secs, 0.1); sleep_secs = MPMIN(sleep_secs * 4, 10.0); } return false; } static void stream_capture_write(stream_t *s, void *buf, size_t len) { if (s->capture_file && len > 0) { if (fwrite(buf, len, 1, s->capture_file) < 1) { MP_ERR(s, "Error writing capture file: %s\n", mp_strerror(errno)); stream_set_capture_file(s, NULL); } } } void stream_set_capture_file(stream_t *s, const char *filename) { if (!bstr_equals(bstr0(s->capture_filename), bstr0(filename))) { if (s->capture_file) fclose(s->capture_file); talloc_free(s->capture_filename); s->capture_file = NULL; s->capture_filename = NULL; if (filename) { s->capture_file = fopen(filename, "ab"); if (s->capture_file) { s->capture_filename = talloc_strdup(NULL, filename); if (s->buf_pos < s->buf_len) stream_capture_write(s, s->buffer, s->buf_len); } else { MP_ERR(s, "Error opening capture file: %s\n", mp_strerror(errno)); } } } } // Read function bypassing the local stream buffer. This will not write into // s->buffer, but into buf[0..len] instead. // Returns 0 on error or EOF, and length of bytes read on success. // Partial reads are possible, even if EOF is not reached. static int stream_read_unbuffered(stream_t *s, void *buf, int len) { int orig_len = len; s->buf_pos = s->buf_len = 0; // we will retry even if we already reached EOF previously. len = s->fill_buffer ? s->fill_buffer(s, buf, len) : -1; if (len < 0) len = 0; if (len == 0) { // just in case this is an error e.g. due to network // timeout reset and retry // do not retry if this looks like proper eof int64_t size = stream_get_size(s); if (!s->eof && s->pos != size && stream_reconnect(s)) { s->eof = 1; // make sure EOF is set to ensure no endless recursion return stream_read_unbuffered(s, buf, orig_len); } s->eof = 1; return 0; } // When reading succeeded we are obviously not at eof. s->eof = 0; s->pos += len; stream_capture_write(s, buf, len); return len; } static int stream_fill_buffer_by(stream_t *s, int64_t len) { len = MPMIN(len, s->read_chunk); len = MPMAX(len, STREAM_BUFFER_SIZE); if (s->sector_size) len = s->sector_size; len = stream_read_unbuffered(s, s->buffer, len); s->buf_pos = 0; s->buf_len = len; return s->buf_len; } int stream_fill_buffer(stream_t *s) { return stream_fill_buffer_by(s, STREAM_BUFFER_SIZE); } // Read between 1..buf_size bytes of data, return how much data has been read. // Return 0 on EOF, error, or if buf_size was 0. int stream_read_partial(stream_t *s, char *buf, int buf_size) { assert(s->buf_pos <= s->buf_len); assert(buf_size >= 0); if (s->buf_pos == s->buf_len && buf_size > 0) { s->buf_pos = s->buf_len = 0; // Do a direct read, but only if there's no sector alignment requirement // Also, small reads will be more efficient with buffering & copying if (!s->sector_size && buf_size >= STREAM_BUFFER_SIZE) return stream_read_unbuffered(s, buf, buf_size); if (!stream_fill_buffer(s)) return 0; } int len = FFMIN(buf_size, s->buf_len - s->buf_pos); memcpy(buf, &s->buffer[s->buf_pos], len); s->buf_pos += len; if (len > 0) s->eof = 0; return len; } int stream_read(stream_t *s, char *mem, int total) { int len = total; while (len > 0) { int read = stream_read_partial(s, mem, len); if (read <= 0) break; // EOF mem += read; len -= read; } total -= len; if (total > 0) s->eof = 0; return total; } // Read ahead at most len bytes without changing the read position. Return a // pointer to the internal buffer, starting from the current read position. // Can read ahead at most STREAM_MAX_BUFFER_SIZE bytes. // The returned buffer becomes invalid on the next stream call, and you must // not write to it. struct bstr stream_peek(stream_t *s, int len) { assert(len >= 0); assert(len <= STREAM_MAX_BUFFER_SIZE); if (s->buf_len - s->buf_pos < len) { // Move to front to guarantee we really can read up to max size. int buf_valid = s->buf_len - s->buf_pos; memmove(s->buffer, &s->buffer[s->buf_pos], buf_valid); // Fill rest of the buffer. while (buf_valid < len) { int chunk = MPMAX(len - buf_valid, STREAM_BUFFER_SIZE); if (s->sector_size) chunk = s->sector_size; assert(buf_valid + chunk <= TOTAL_BUFFER_SIZE); int read = stream_read_unbuffered(s, &s->buffer[buf_valid], chunk); if (read == 0) break; // EOF buf_valid += read; } s->buf_pos = 0; s->buf_len = buf_valid; if (s->buf_len) s->eof = 0; } return (bstr){.start = &s->buffer[s->buf_pos], .len = FFMIN(len, s->buf_len - s->buf_pos)}; } int stream_write_buffer(stream_t *s, unsigned char *buf, int len) { int rd; if (!s->write_buffer) return -1; rd = s->write_buffer(s, buf, len); if (rd < 0) return -1; s->pos += rd; assert(rd == len && "stream_write_buffer(): unexpected short write"); return rd; } static bool stream_skip_read(struct stream *s, int64_t len) { while (len > 0) { int x = s->buf_len - s->buf_pos; if (x == 0) { if (!stream_fill_buffer_by(s, len)) return false; // EOF x = s->buf_len - s->buf_pos; } if (x > len) x = len; s->buf_pos += x; len -= x; } return true; } // Drop the internal buffer. Note that this will advance the stream position // (as seen by stream_tell()), because the real stream position is ahead of the // logical stream position by the amount of buffered but not yet read data. void stream_drop_buffers(stream_t *s) { s->pos = stream_tell(s); s->buf_pos = s->buf_len = 0; s->eof = 0; } // Seek function bypassing the local stream buffer. static bool stream_seek_unbuffered(stream_t *s, int64_t newpos) { if (newpos != s->pos) { if (newpos > s->pos && !s->seekable) { MP_ERR(s, "Cannot seek forward in this stream\n"); return false; } if (newpos < s->pos && !s->seekable) { MP_ERR(s, "Cannot seek backward in linear streams!\n"); return false; } if (s->seek(s, newpos) <= 0) { MP_ERR(s, "Seek failed\n"); return false; } stream_drop_buffers(s); s->pos = newpos; } return true; } bool stream_seek(stream_t *s, int64_t pos) { MP_TRACE(s, "seek to %lld\n", (long long)pos); s->eof = 0; // eof should be set only on read; seeking always clears it if (pos == stream_tell(s)) return true; if (pos < 0) { MP_ERR(s, "Invalid seek to negative position %lld!\n", (long long)pos); pos = 0; } if (pos < s->pos) { int64_t x = pos - (s->pos - (int)s->buf_len); if (x >= 0) { s->buf_pos = x; return true; } } if (s->mode == STREAM_WRITE) return s->seekable && s->seek(s, pos); int64_t newpos = pos; if (s->sector_size) newpos = (pos / s->sector_size) * s->sector_size; MP_TRACE(s, "Seek from %" PRId64 " to %" PRId64 " (with offset %d)\n", s->pos, pos, (int)(pos - newpos)); if (pos >= s->pos && !s->seekable && s->fast_skip) { // skipping is handled by generic code below } else if (!stream_seek_unbuffered(s, newpos)) { return false; } bool r = pos >= s->pos && stream_skip_read(s, pos - s->pos); if (!r) MP_VERBOSE(s, "Seek to/past EOF: no buffer preloaded.\n"); s->eof = 0; return r; } bool stream_skip(stream_t *s, int64_t len) { int64_t target = stream_tell(s) + len; if (len < 0) return stream_seek(s, target); if (len > 2 * STREAM_BUFFER_SIZE && s->seekable) { // Seek to 1 byte before target - this is the only way to distinguish // skip-to-EOF and skip-past-EOF in general. Successful seeking means // absolutely nothing, so test by doing a real read of the last byte. if (!stream_seek(s, target - 1)) return false; stream_read_char(s); return !stream_eof(s) && stream_tell(s) == target; } return stream_skip_read(s, len); } int stream_control(stream_t *s, int cmd, void *arg) { return s->control ? s->control(s, cmd, arg) : STREAM_UNSUPPORTED; } // Return the current size of the stream, or a negative value if unknown. int64_t stream_get_size(stream_t *s) { int64_t size = -1; if (stream_control(s, STREAM_CTRL_GET_SIZE, &size) != STREAM_OK) size = -1; return size; } void free_stream(stream_t *s) { if (!s) return; stream_set_capture_file(s, NULL); if (s->close) s->close(s); free_stream(s->uncached_stream); talloc_free(s); } stream_t *open_memory_stream(void *data, int len) { assert(len >= 0); struct mpv_global *dummy = talloc_zero(NULL, struct mpv_global); dummy->log = mp_null_log; stream_t *s = stream_open("memory://", dummy); assert(s); talloc_steal(s, dummy); stream_control(s, STREAM_CTRL_SET_CONTENTS, &(bstr){data, len}); return s; } static stream_t *open_cache(stream_t *orig, const char *name) { stream_t *cache = new_stream(); cache->uncached_type = orig->uncached_type; cache->uncached_stream = orig; cache->seekable = true; cache->mode = STREAM_READ; cache->read_chunk = 4 * STREAM_BUFFER_SIZE; cache->url = talloc_strdup(cache, orig->url); cache->mime_type = talloc_strdup(cache, orig->mime_type); cache->demuxer = talloc_strdup(cache, orig->demuxer); cache->lavf_type = talloc_strdup(cache, orig->lavf_type); cache->streaming = orig->streaming, cache->is_network = orig->is_network; cache->opts = orig->opts; cache->cancel = orig->cancel; cache->global = orig->global; cache->log = mp_log_new(cache, cache->global->log, name); return cache; } static struct mp_cache_opts check_cache_opts(stream_t *stream, struct mp_cache_opts *opts) { struct mp_cache_opts use_opts = *opts; if (use_opts.size == -1) use_opts.size = stream->streaming ? use_opts.def_size : 0; if (use_opts.size == -2) use_opts.size = use_opts.def_size; if (stream->mode != STREAM_READ || !stream->allow_caching || use_opts.size < 1) use_opts.size = 0; return use_opts; } bool stream_wants_cache(stream_t *stream, struct mp_cache_opts *opts) { struct mp_cache_opts use_opts = check_cache_opts(stream, opts); return use_opts.size > 0; } // return 1 on success, 0 if the cache is disabled/not needed, and -1 on error // or if the cache is disabled int stream_enable_cache(stream_t **stream, struct mp_cache_opts *opts) { stream_t *orig = *stream; struct mp_cache_opts use_opts = check_cache_opts(*stream, opts); if (use_opts.size < 1) return 0; stream_t *fcache = open_cache(orig, "file-cache"); if (stream_file_cache_init(fcache, orig, &use_opts) <= 0) { fcache->uncached_stream = NULL; // don't free original stream free_stream(fcache); fcache = orig; } stream_t *cache = open_cache(fcache, "cache"); int res = stream_cache_init(cache, fcache, &use_opts); if (res <= 0) { cache->uncached_stream = NULL; // don't free original stream free_stream(cache); if (fcache != orig) free_stream(fcache); } else { *stream = cache; } return res; } static uint16_t stream_read_word_endian(stream_t *s, bool big_endian) { unsigned int y = stream_read_char(s); y = (y << 8) | stream_read_char(s); if (!big_endian) y = ((y >> 8) & 0xFF) | (y << 8); return y; } // Read characters until the next '\n' (including), or until the buffer in s is // exhausted. static int read_characters(stream_t *s, uint8_t *dst, int dstsize, int utf16) { if (utf16 == 1 || utf16 == 2) { uint8_t *cur = dst; while (1) { if ((cur - dst) + 8 >= dstsize) // PUT_UTF8 writes max. 8 bytes return -1; // line too long uint32_t c; uint8_t tmp; GET_UTF16(c, stream_read_word_endian(s, utf16 == 2), return -1;) if (s->eof) break; // legitimate EOF; ignore the case of partial reads PUT_UTF8(c, tmp, *cur++ = tmp;) if (c == '\n') break; } return cur - dst; } else { if (s->buf_pos >= s->buf_len) stream_fill_buffer(s); uint8_t *src = s->buffer + s->buf_pos; int src_len = s->buf_len - s->buf_pos; uint8_t *end = memchr(src, '\n', src_len); int len = end ? end - src + 1 : src_len; if (len > dstsize) return -1; // line too long memcpy(dst, src, len); s->buf_pos += len; return len; } } // On error, or if the line is larger than max-1, return NULL and unset s->eof. // On EOF, return NULL, and s->eof will be set. // Otherwise, return the line (including \n or \r\n at the end of the line). // If the return value is non-NULL, it's always the same as mem. // utf16: 0: UTF8 or 8 bit legacy, 1: UTF16-LE, 2: UTF16-BE unsigned char *stream_read_line(stream_t *s, unsigned char *mem, int max, int utf16) { if (max < 1) return NULL; int read = 0; while (1) { // Reserve 1 byte of ptr for terminating \0. int l = read_characters(s, &mem[read], max - read - 1, utf16); if (l < 0 || memchr(&mem[read], '\0', l)) { MP_WARN(s, "error reading line\n"); s->eof = false; return NULL; } read += l; if (l == 0 || (read > 0 && mem[read - 1] == '\n')) break; } mem[read] = '\0'; if (s->eof && read == 0) // legitimate EOF return NULL; return mem; } static const char *const bom[3] = {"\xEF\xBB\xBF", "\xFF\xFE", "\xFE\xFF"}; // Return utf16 argument for stream_read_line int stream_skip_bom(struct stream *s) { bstr data = stream_peek(s, 4); for (int n = 0; n < 3; n++) { if (bstr_startswith0(data, bom[n])) { stream_skip(s, strlen(bom[n])); return n; } } return -1; // default to 8 bit codepages } // Read the rest of the stream into memory (current pos to EOF), and return it. // talloc_ctx: used as talloc parent for the returned allocation // max_size: must be set to >0. If the file is larger than that, it is treated // as error. This is a minor robustness measure. // returns: stream contents, or .start/.len set to NULL on error // If the file was empty, but no error happened, .start will be non-NULL and // .len will be 0. // For convenience, the returned buffer is padded with a 0 byte. The padding // is not included in the returned length. struct bstr stream_read_complete(struct stream *s, void *talloc_ctx, int max_size) { if (max_size > 1000000000) abort(); int bufsize; int total_read = 0; int padding = 1; char *buf = NULL; int64_t size = stream_get_size(s) - stream_tell(s); if (size > max_size) return (struct bstr){NULL, 0}; if (size > 0) bufsize = size + padding; else bufsize = 1000; while (1) { buf = talloc_realloc_size(talloc_ctx, buf, bufsize); int readsize = stream_read(s, buf + total_read, bufsize - total_read); total_read += readsize; if (total_read < bufsize) break; if (bufsize > max_size) { talloc_free(buf); return (struct bstr){NULL, 0}; } bufsize = FFMIN(bufsize + (bufsize >> 1), max_size + padding); } buf = talloc_realloc_size(talloc_ctx, buf, total_read + padding); memset(&buf[total_read], 0, padding); return (struct bstr){buf, total_read}; } struct bstr stream_read_file(const char *filename, void *talloc_ctx, struct mpv_global *global, int max_size) { struct bstr res = {0}; char *fname = mp_get_user_path(NULL, global, filename); stream_t *s = stream_open(fname, global); if (s) { res = stream_read_complete(s, talloc_ctx, max_size); free_stream(s); } talloc_free(fname); return res; } #ifndef __MINGW32__ struct mp_cancel { atomic_bool triggered; int wakeup_pipe[2]; }; static void cancel_destroy(void *p) { struct mp_cancel *c = p; close(c->wakeup_pipe[0]); close(c->wakeup_pipe[1]); } struct mp_cancel *mp_cancel_new(void *talloc_ctx) { struct mp_cancel *c = talloc_ptrtype(talloc_ctx, c); talloc_set_destructor(c, cancel_destroy); *c = (struct mp_cancel){.triggered = ATOMIC_VAR_INIT(false)}; mp_make_wakeup_pipe(c->wakeup_pipe); return c; } // Request abort. void mp_cancel_trigger(struct mp_cancel *c) { atomic_store(&c->triggered, true); (void)write(c->wakeup_pipe[1], &(char){0}, 1); } // Restore original state. (Allows reusing a mp_cancel.) void mp_cancel_reset(struct mp_cancel *c) { atomic_store(&c->triggered, false); // Flush it fully. while (1) { int r = read(c->wakeup_pipe[0], &(char[256]){0}, 256); if (r < 0 && errno == EINTR) continue; if (r <= 0) break; } } // Return whether the caller should abort. // For convenience, c==NULL is allowed. bool mp_cancel_test(struct mp_cancel *c) { return c ? atomic_load_explicit(&c->triggered, memory_order_relaxed) : false; } // Wait until the even is signaled. If the timeout (in seconds) expires, return // false. timeout==0 polls, timeout<0 waits forever. bool mp_cancel_wait(struct mp_cancel *c, double timeout) { struct pollfd fd = { .fd = c->wakeup_pipe[0], .events = POLLIN }; poll(&fd, 1, timeout * 1000); return fd.revents & POLLIN; } // The FD becomes readable if mp_cancel_test() would return true. // Don't actually read from it, just use it for poll(). int mp_cancel_get_fd(struct mp_cancel *c) { return c->wakeup_pipe[0]; } #else struct mp_cancel { atomic_bool triggered; HANDLE event; }; static void cancel_destroy(void *p) { struct mp_cancel *c = p; CloseHandle(c->event); } struct mp_cancel *mp_cancel_new(void *talloc_ctx) { struct mp_cancel *c = talloc_ptrtype(talloc_ctx, c); talloc_set_destructor(c, cancel_destroy); *c = (struct mp_cancel){.triggered = ATOMIC_VAR_INIT(false)}; c->event = CreateEventW(NULL, TRUE, FALSE, NULL); return c; } void mp_cancel_trigger(struct mp_cancel *c) { atomic_store(&c->triggered, true); SetEvent(c->event); } void mp_cancel_reset(struct mp_cancel *c) { atomic_store(&c->triggered, false); ResetEvent(c->event); } bool mp_cancel_test(struct mp_cancel *c) { return c ? atomic_load_explicit(&c->triggered, memory_order_relaxed) : false; } bool mp_cancel_wait(struct mp_cancel *c, double timeout) { return WaitForSingleObject(c->event, timeout < 0 ? INFINITE : timeout * 1000) == WAIT_OBJECT_0; } void *mp_cancel_get_event(struct mp_cancel *c) { return c->event; } int mp_cancel_get_fd(struct mp_cancel *c) { return -1; } #endif char **stream_get_proto_list(void) { char **list = NULL; int num = 0; for (int i = 0; stream_list[i]; i++) { const stream_info_t *stream_info = stream_list[i]; if (!stream_info->protocols) continue; for (int j = 0; stream_info->protocols[j]; j++) { if (*stream_info->protocols[j] == '\0') continue; MP_TARRAY_APPEND(NULL, list, num, talloc_strdup(NULL, stream_info->protocols[j])); } } MP_TARRAY_APPEND(NULL, list, num, NULL); return list; } void stream_print_proto_list(struct mp_log *log) { int count = 0; mp_info(log, "Protocols:\n\n"); char **list = stream_get_proto_list(); for (int i = 0; list[i]; i++) { mp_info(log, " %s://\n", list[i]); count++; talloc_free(list[i]); } talloc_free(list); mp_info(log, "\nTotal: %d protocols\n", count); }