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b9af4409bc
mpv/stream/stream.c
wm4 b9430309ec stream: add an assert() to an obscure seek case 
This affects small seeks backwards while within the buffer. Demuxers
usually avoid this, so it's probably not triggered very often. (Although
demux_mkv.c potentially triggers it often, and it uses stream_peek() to
explicitly guarantee that it can use this code to seek back.) The
condition is complex enough to warrant an assertion.
2017-08-17 17:38:07 +02:00

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <strings.h>
#include <assert.h>
#include <libavutil/common.h>
#include "osdep/atomic.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 <windows.h>
#else
#include <poll.h>
#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;
extern const stream_info_t stream_info_cb;
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 || HAVE_DVDNAV
&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,
&stream_info_cb,
NULL
};
static bool stream_seek_unbuffered(stream_t *s, int64_t newpos);
// return -1 if not hex char
static int hex2dec(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'A' && c <= 'F')
return 10 + c - 'A';
if (c >= 'a' && c <= 'f')
return 10 + c - 'a';
return -1;
}
// Replace escape sequences in an URL (or a part of an URL)
void mp_url_unescape_inplace(char *url)
{
for (int len = strlen(url), i = 0, o = 0; i <= len;) {
if ((url[i] != '%') || (i > len - 3)) { // %NN can't start after len-3
url[o++] = url[i++];
continue;
}
int msd = hex2dec(url[i + 1]),
lsd = hex2dec(url[i + 2]);
if (msd >= 0 && lsd >= 0) {
url[o++] = 16 * msd + lsd;
i += 3;
} else {
url[o++] = url[i++];
url[o++] = url[i++];
url[o++] = url[i++];
}
}
}
static const char hex_digits[] = "0123456789ABCDEF";
static const char url_default_ok[] = "abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-._~";
// 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 *url, const char *ok)
{
char *rv = talloc_size(talloc_ctx, strlen(url) * 3 + 1);
char *out = rv;
bool negate = ok && ok[0] == '~';
for (char c; (c = *url); url++) {
bool as_is = negate ? !strchr(ok + 1, c)
: (strchr(url_default_ok, c) || (ok && strchr(ok, c)));
if (as_is) {
*out++ = c;
} else {
unsigned char v = c;
*out++ = '%';
*out++ = hex_digits[v / 16];
*out++ = hex_digits[v % 16];
}
}
*out = 0;
return rv;
}
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 = url;
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->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);
if (global->config) {
int opt;
mp_read_option_raw(global, "access-references", &m_option_type_flag, &opt);
s->access_references = opt;
}
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;
}
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);
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->caching || !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;
}
// 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 res = 0;
s->buf_pos = s->buf_len = 0;
// we will retry even if we already reached EOF previously.
if (s->fill_buffer && !mp_cancel_test(s->cancel))
res = s->fill_buffer(s, buf, len);
if (res <= 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, len);
}
s->eof = 1;
return 0;
}
// When reading succeeded we are obviously not at eof.
s->eof = 0;
s->pos += res;
return res;
}
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;
}
// Drop len bytes form input, possibly reading more until all is skipped. If
// EOF or an error was encountered before all could be skipped, return false,
// otherwise return true.
static bool stream_skip_read(struct stream *s, int64_t len)
{
while (len > 0) {
unsigned int left = s->buf_len - s->buf_pos;
if (!left) {
if (!stream_fill_buffer_by(s, left))
return false;
continue;
}
unsigned skip = MPMIN(len, left);
s->buf_pos += skip;
len -= skip;
}
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;
assert(s->buf_pos <= s->buf_len);
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;
}
return stream_skip_read(s, pos - stream_tell(s));
}
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;
if (s->close)
s->close(s);
free_stream(s->underlying);
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->underlying = orig;
cache->caching = true;
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->is_local_file = orig->is_local_file;
cache->is_directory = orig->is_directory;
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
static 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->underlying = 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->underlying = NULL; // don't free original stream
free_stream(cache);
if (fcache != orig) {
fcache->underlying = NULL;
free_stream(fcache);
}
} else {
*stream = cache;
}
return res;
}
// Do some crazy stuff to call stream_enable_cache() with the global options.
int stream_enable_cache_defaults(stream_t **stream)
{
struct mpv_global *global = (*stream)->global;
if (!global)
return 0;
void *tmp = talloc_new(NULL);
struct mp_cache_opts *opts =
mp_get_config_group(tmp, global, &stream_cache_conf);
int r = stream_enable_cache(stream, opts);
talloc_free(tmp);
return r;
}
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;
if (c->wakeup_pipe[0] >= 0) {
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);
}
bool stream_has_proto(const char *proto)
{
for (int i = 0; stream_list[i]; i++) {
const stream_info_t *stream_info = stream_list[i];
for (int j = 0; stream_info->protocols && stream_info->protocols[j]; j++) {
if (strcmp(stream_info->protocols[j], proto) == 0)
return true;
}
}
return false;
}
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